HOW TO ENTER SERVICE MODE – HITACHI 42PD7500 Plasma Display – ERROR CODES – LED BLINKING CODES – SELF DIAGNOSIS – BURN-IN MODE

How to enter Service Mode _ Error Display Codes _ LED blinking codes _ Self Diagnosis _ Signal circuit Self Diagnosis _ Burn in mode – Factory Reset - Memory Initialize -  HITACHI 42PD7500 – Plasma Display

LED BLINKING CODES

Self-Diagnosis Function
This chassis has 2 modes of self-diagnosis function.
1.  PDP panel check mode. It indicates the one latest record of the PDP panel failure with blinking of the power indication light (LED).
2. Signal circuit check mode.

 It indicates the check result on some points of the signal circuit and the history of them with On-Screen Display (OSD).

PDP panel self-diagnosis function
This function is for a PDP panel failure with no picture.
To enter to this Self-Diagnosis mode, follow the next steps:
Preparation
1. The Power Cord should be connected to AC line and the Main Power switch should be turned on.
2. Turn the power off by the SUB-POWER button of the monitor or the remote control.
Procedure
1. Press the SUB-POWER button and ▼ button on the bottom of the monitor at the same time, and keep it for more than 5 seconds after the power turned on.

2. It generates red blinking series of the power indicator light.
3. Any operation would cancel the Self -Diagnosis mode.
4. The next table shows the PDP PWB in which failure most probably would be allocated according to the number of blinks.

Signal circuit self-diagnosis function
This function is for the failure of the signal circuit, for example the phenomenon as below:
"Sometimes power turns off abnormally." "Sometimes picture disappears abnormally."
To enter to this Self-Diagnosis mode, follow the next steps
Preparation
1. The Power Cord should be connected to AC line and the Main Power switch should be turned on.
2. Turn the power off by the SUB-POWER button of the monitor or the remote control.
Procedure
1. Press the SUB-POWER button and ▲ button on the bottom of the monitor at the same time, and keep it for more than 5 seconds after the power turned on.

2. The monitor will be turned on, and it will display On-Screen Display of the Self-check result and the failure history as below.
3. Any operation would cancel the Self -Diagnosis mode.
4. The following table shows the OSD symbols and contents of failure PWB in which failure most probably would be allocated according to the number of blinks.

If you clear history of failure, make FACTORY RESET: enter the factory setting mode; press the SUB-POWER( ) button, INPUT SELECT button and ▲  button on the bottom of the monitor at the same time. And keep it for more than 5 seconds after the power turned on.

ERROR CODES DISPLAY

Factory Reset
After all of the adjustments of main chassis are finished, perform FACTORY RESET.
Press the SUB-POWER button, INPUT SELECT button and ▲ button at the same time, and hold for more than 5 seconds.

The unit is set to factory settings.

Memory Initialize operation
NOTE: The execution of this function returns the adjustment codes to the preset values, therefore, adjustment
data will be lost.
Procedure* Enter Adjustment Mode.
* Select MEMORY INIT adjustment code (No.658) and change the data value from 0 to 1.
* Activate MEMORY INIT by pressing OK button for more than 3 seconds.
* Select No.525 and change data value from 1 to 0.
* Check that the receiving channel goes to P1. Unit is set to preset values.

How to get to Burn-in mode
This mode displays the test patterns of some single color raster in turn. These signals are from built-in generator of PDP panel. So it can be presumed that maybe the panel has some trouble when the screen of Burn-in mode is abnormal.
Using the front control buttons with the set turned off (standby) can activate this mode. Press the SUB-POWER button, INPUT SELECT button and VOLUME DOWN button at the same time, and hold for more than 5 seconds.
The set turns on with single color raster and the OSD of [BURN IN: ON].
To escape from this mode, press the SUB-POWER button, INPUT SELECT button and button at the same time, and hold for more than 5 seconds. Burn-in mode will be released.

How to recover the remote and front key function
If remote and front key cannot operate after miss set special function by front keys, these functions can recover by below method.
Press the SUB-POWER button, INPUT SELECT button and ▼ button at the same time, and hold for more than 5 seconds.

The set turns on the service menu mode.
Select No.535 and data set from [0] to [1], and select No.536 and data set from (0) to (1).
Or
Press the SUB-POWER button and Vol+ button at the same time, and hold for more than 5 seconds.

How to check method of the use accumulation time for panel.
Select No.518 of Service Adjustment Menu.

How to get to Adjustment (Service)  mode* Using the front control buttons with the set turned off (standby) can activate it.
* Press the SUB-POWER button, INPUT SELECT button and button at the same time, and hold for more than 5 seconds.
The set turns on in adjustment mode with OSD.

Changing data and Selecting Adjustment code
> When the set is in adjustment mode, the cursor ▲, ▼, ◄, ►  and OK buttons of the remote control or front panel
may be used as the adjustment keys.

> ▲, ▼ buttons are used for selecting adjustment code.

> ◄, ► buttons are used for changing data values.

> OK button is used for confirming the data.
After finishing the necessary adjustment press MENU button. Adjustment mode is released and the set returns to normal condition.

HOW TO ADJUST Va and Vs VOLTAGES TO LG PLASMA TVs

LG 32”XGA_50”_42”_60” Plasma Televisions Display Panel Voltage (Va & Vs) adjustment procedure

50” POWER PCB Ass’y Voltage Adjustment (Va, Vs voltage Adjustment).  50PG6000, 50PG6010

Va Adjustment.
* After receiving 100% Full White Pattern, HEAT RUN.
* Connect + terminal of D. M.M. to Va pin of P811, connect -terminal to GND pin of P811.
* After turning VR901,voltage of D.M.M adjustment as same as Va voltage which on label of panel right/top (deviation; ±0.5V)

Vs Adjustment

* Connect + terminal of D. M..M. to Vs pin of P811, connect -terminal to GND pin of P811.
* After turning VR951, voltage of D.M.M adjustment as same as Vs voltage which on label of panel right/top(deviation ; ±0.5V)

42” POWER PCB Ass’y Voltage Adjustment (Va, Vs voltage Adjustment)  42PG6000, 42PG6010

Va Adjustment.

> After receiving 100% Full White Pattern, HEAT RUN.
> Connect + terminal of D. M..M. to Va pin of P811, connect -terminal to GND pin of P811.
> After turning VR901,voltage of D.M.M adjustment as same as Va voltage which on label of panel right/top (deviation; ±0.5V)

Vs Adjustment
> Connect + terminal of D. M..M. to Vs pin of P811, connect -terminal to GND pin of P811.
> After turning VR951, voltage of D.M.M adjustment as same as Vs voltage which on label of panel right/top(deviation ; ±0.5V)

60”(FHD), 50”(FHD) POWER PCB Ass’y Voltage Adjustment (Va, Vs voltage Adjustment). 50PG7000, 60PG7000, 50PG4000

Va Adjustment.
* After receiving 100% Full White Pattern, HEAT RUN.
* Connect + terminal of D. M..M. to Va pin of P11, connect -terminal to GND pin of P11.
* After turning VR901,voltage of D.M.M adjustment as same as Va voltage which on label of panel right/top (deviation; ±0.5V)

Vs Adjustment.
* Connect + terminal of D. M..M. to Vs pin of P11, connect -terminal to GND pin of P11.
* After turning VR951, voltage of D.M.M adjustment as same as Vs voltage which on label of panel right/top(deviation ; ±0.5V)

32”(XGA) POWER PCB Ass’y Voltage Adjustment (Va, Vs voltage Adjustment). 32PG6000, 32PG6010

Va Adjustment.

1. After receiving 100% Full White Pattern, HEAT RUN.
2. Connect + terminal of D. M.M. to Va pin of P811, connect -terminal to GND pin of P811.
3. After turning VR901,voltage of D.M.M adjustment as same as Va voltage which on label of panel right/top (deviation; ±0.5V)

Vs Adjustment

1. Connect + terminal of D. M..M. to Vs pin of P811, connect -terminal to GND pin of P811.
2. After turning VR951, voltage of D.M.M adjustment as same as Vs voltage which on label of panel right/top(deviation ; ±0.5V)

The module keeping condition

* The normal temperature condition (more than 15°C)  >  Immediately the line supply.
* The module keeping condition: 0°C > The module must be kept for more than 2 hours at the normal temperature.
* The module keeping condition: -20°C > The module must be kept for more than 3 hours at the normal temperature.
* The case of Gu-mi factory at the winter season. > The module must be kept for more than 5 minutes at the heating zone (40°C~45°C)

Because this is not a hot chassis, it is not necessary to use an isolation transformer. However, the use of isolation transformer will help protect test instrument.
> Adjustment must be done in the correct order.
> The adjustment must be performed in the circumstance of 25±5°C of temperature and 65±10% of relative humidity if there is no specific designation.
> The input voltage of the receiver must keep 100~240V, 50/60Hz.
> The receiver must be operated for about 5 minutes prior to the adjustment.
 After RGB Full White in HEAT-RUN Mode, the receiver must be operated prior to the adjustment.

To Enter into HEAT-RUN MODE
* Press the POWER ON KEY on R/C for adjustment.

* Press the ADJ KEY on R/C and enter EZ ADJUST Select “3. Test Pattern” by using D /E (CH +/-) and press ENTER(V ) Select “White” by using F /G (VOL +/-) and press ENTER(V )
> Set is activated HEAT run without signal generator in this mode.
> Single color pattern (RED / BLUE / GREEN) of HEAT RUN MODE uses to check panel.
Caution: If you turn on a still screen more than 20 minutes (Especially digital pattern, cross hatch pattern), an after image may be occur in the black level part of the screen.

DELL W2607C LCD TV - HOW TO ENTER SERVICE MODE – ADJUSTMENTS – DISASSEMBLE – POWER SCHEMATIC

How to disassemble Dell W2607C LCD TV – SMPS Schematic – Service Mode

Used ICs in SMPS: FAN5500AN _ NCP1377 _ STP10NK80ZFP(Power Switching MOSFET) _ PC123FY2 4P (Photo-coupler) _ AD4411 _ SCR 2N5060 _ ST8120 _ STR-A6252  

SERVICE MODE

* No OSD pictures on screen, Press Number key 2 > 4 > 8 > 6 > MENU > INFO in Remote Control will access into the factory mode. (Service Mode)

* Press MENU button to quit from factory mode.

In the factory mode:

The data is the result of R  G  B after W/B adjustment:

5700K R G B

6500K R G B

9300K R G B

NATURAL R G B

NVRAM Init > Initial EEPROM

Burn in mode On/OFF

WHITE BALANCE ADJUSTMENT 

Initial the EEPROM
> Press “NVRAM Init: Press  “OK”  to start” to initial EEPROM.
Bias (Low luminance) adjustment
Ensure the currently mode is PC (VGA)
Press “Auto Balance” button (the image is black and white at the PAT42)

GAIN ADJUSTMENT

> Switch the chroma-7120 to RGB-mode (with press “MODE” button)
> Let the signal output the white image (press pattern 105), select one of the color temp (as Natural、 6500K、9300K、 5700K) and adjust factory mode window R  G  B until up to the value Chroma7120 R, G, B=100± 3.
> Select another color temp and follows as item 2.

AV W/B adjustment
Gain adjustment
> Switch the chroma-7120 to RGB-mode (with press “MODE” button)
> Let the signal output the white image (press pattern 105), select one of the color temp (as Natural、 6500K、9300K、 5700K) and adjust factory mode window R  G  B until up to the value Chroma7120 R, G, B=100± 3.
> Select another color temp and follows as item 2.

SV(S-Video) W/B adjustment
the steps of SV’s W/B adjustment is the same as AV’s.

(component) W/B adjustment
the steps of CP’s W/B adjustment as same as PC’s.

Max Brightness measurement
* Switch to the full white pattern, in normal mode main menu
* Set “Picture Settings” menu Brightness, Contrast to the max.
The Minimum brightness is 400cd/m².

DISASSEMBLE PROCEDURE

Remove Stand and base & Back cover
Lay LCD-TV on a flat, soft and clean surface.
> Remove 4 screws to remove stand and base.

> Remove 4 screws at the top of the back cover. Fig.2
> Remove 2 screws at the left top of the back cover. Fig.3
> Remove 2 screws at the right top of the back cover. Fig.4
> Remove the connector wire of back cover and interface board

Remove the shield

* Remove 8 screws of the shield at the top and bottom shield. Fig. 6
* Remove 2 screws of the shield at the left. Fig. 7
* Remove 1 screw of the shield at the right.

SMPS (Power Supply Regulator) Circuit diagram

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CHINESE COLOR TV KIT - SERVICE HELP - LA76810 - LC863532C

USED ICs: AT24C04/08 (System Memory) – LC863532Cxxxx (Main System Control) – LA76810 or LA76818A (Horizontal_Vertical_Chroma_VIF _Sync-Seperator Jungle) – AN17821A (Audio Output) – LA78040 (Vertical Output) – BSC24-0144014K / BSC-09N20E LOT_ (Line Output or Fly-back Transformer)
Possible SMPS faults and repair procedures
Set Dead - Condition -1
Set dead - Condition - 2

SET DEAD.  NO POWER - 1

  When switch ON, there is no power light or any other indication.  Sometimes, the Power LED may light up, and shut down atonce.

  The power supply section circuit to this kit has short circuit protection.  By anyway, any short circuit occurs at the main board, the power won’t switch ON.  The main cause found to this circuit is with shorted Horizontal Output Transistor [2SD1651C / 2SD2499; (Collector to Emitter or Collector to Base; short).  The best way to troubleshoot is, just de-solder out the horizontal output transistor from the PWB, and just switch ON the set, and see whether the Standby Light is ON.  If it does, make sure that this transistor is damaged.

Before replacing this transistor, just check for any other reason for its failure.  The C435 & C438 should be checked with a capacitance meter for its capacity.  It will be best to replace both of them at the same time, along with the horizontal output transistor.  Even loose solder terminals at these capacitor terminals will surely make the H-Out transistor get shorted.  Check VD435 & VD436 and C437 too.  Without checking all these components and its soldering thoroughly, never switch on the set with a new H-Out transistor.

  The next possibility for H-out transistor failure is; it’s loose seating screw with the heat sink.  Another one is with shorted winding [Horizontal section] of the deflection yoke.  Other is HOT [Horizontal Output Transistor; otherwise called as LOT BSC24-01N4014K / BSC25-09N20E.  Check all the solder terminals to the leads of this Line out Transformer [LOT] too, for any loose soldering.

  If deflection yoke winding has any short (this short can’t be measure by normal technique or with a multimenter); it should be replaced before switch on the set.  You can switch ON the set without this deflection yoke connection; but; must unplug the CRT base card from the CRT base; otherwise there is a chance to make a dark spot at the center of the screen due to accelerated beam of electrons inside the CRT, without any scanning.  It will fall straight at the center of the screen itself, provided the LOT and H-Out transistor as well as the SMPS is OK.  Be sure about this, when you switch on the set without deflection yoke connection.  This is true to any CRT based televisions; irrespective of its brand and size.

  If the horizontal output transistor is found damaged, check the load resistor R551 2.2Ohms 2W W/W for open.  In most cases, this won’t happen to this kind of circuit, as any short circuit occurs at the secondary stage of the SMPS will clause the SMPS to shut down instantaneously.

  In practice, this is the most venerable fault that can occur to sets fitted with this kit.  90% of it I did faced was it. 

  If the LOT is defective (Internal short in its winding), the horizontal output transistor will heat up within seconds.  To make this sure, just switch ON the set, and see whether the standby light lights up.  If it does, just switch it OFF after 30 or 40 seconds, and unplug the set from AC mains wall socket, and feel the heat of the horizontal output transistor with bare fingers.  It can be slightly warm, but not too hot.  This effect can due to a damaged deflection yoke too.

 It is advised to re-solder all the terminals of IC LA76810 / LA76818A; because this IC will heat up to an extent while the set works, and repeated heating and cooling can make its solder terminals to expand and shrink; and make any loose solder terminals, so microscopic to see with naked eye.  It is be best to suck out the solder from each terminal; using a solder suction pump and re-solder it by applying fresh solder, without making any solder bridge short in between.  Be very careful.  After soldering the IC terminals, clean it using Medical Quality Turpentine or Rectified Spirit. 

  In most cases, the main system control IC found OK.  Do not do any unwanted checks and meter prods touches to it; when power is ON.  This is a very sensitive IC; can be damaged easily.

  The SMPS circuit to this set is quite simple related to STR based ones, and is easy to follow.  I’ve here described some service experiences of mine with this type of kit.  There might be more to describe for others.  Service experiences to person to person will be different indeed.

SCHEMATIC

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SET DEAD - Condition - 2

  And now; let’s come to the second stage of no power possibility.  Its main power regulator [SMPS] section circuit.  There are two stages to this section, a primary stage power [input] and a secondary stage [outputs]

How can we check it?

  Let’s take the primary stage AC [input] section first.  AC power is the input to this section and passed through a line filter [L501], a full wave bridge rectifier section consists of 4xRL 207 diodes, the smoothed by a main filter capacitor C507; and the DC voltage is applied to the primary winding of the SMPS transformer,  the other end of the winding is connected directly to the collector of main switching transistor 2SD2498.The emitter of this transistor is pulled back to ground via a resistor of low Ohm value (usually be a wire-wound fusible type.

  The transistor 2SD2498 acts as a high speed electronic switch, at about the rate of 40 to 45KHz.  The oscillation to its base to work at this frequency is generated and supplied by two other small signal transistors.  In simple, this SMPS consists of 3 semiconductors.  Let’s go straight to the fault/s that can occur to this circuit.  

  Assume that the set is dead, No power light, no other response on switch ON.  As we checked earlier, take out the horizontal output transistor from the circuit, and then switch ON the set. Check whether the standby LED light up or not.  Still the set is dead.  Let’s continue.

  The first thing to check is whether there is any electric charge accumulated is stored in the main filter capacitor C507 (Main Filter).  It should be checked first; because, if it is fully charged by any way; the voltage across its two terminals might be up to 375VDC.  In this condition, by chance if we try to measure any resistance parameters in this primary circuit, with multimeter set to Ohms  or other resistance measurement range;  the meterwill be get damaged instantaneously.  There is no doubt about it.  So, the first thing is to check this.  Set the multimeter to measure 1000VDC and measure the voltage across this main filter capacitor.  Make sure that there is no voltage at all; before you proceed.  If some voltage is present; say at least 10VDC, it should be discharged.  Discharge it well.

  In most cases, the fault I found to this stage was with a blown fuse.  But, if the fuse should blow up, there should be sufficiant reason.  The fuse is not used there for none.  It is a protection fuse.  If a protection fuse should fail, surely there will be some fault (short-circuit) to the circuit.  Without rectifying it; if we put another fuse in place, and switch On the set, we are actually inviting danger, and damage to more component.  So; if fuse is found blown up, check and find out the reason for it.  There will be a reason.  It's sure.

  See the SMPS the circuit. [Given below]. A 3.5Amp (Glass Cartridge or Ceramic type) fuse is used in series with any one of the AC inputs. 

Check the resistance across R501 first,  It should be more than 200KOhms.  In most cases, the resistance measurement at this point might measure almost Zero Ohms; means a short circuit.  If so, de-solder out one terminal of C501 and then measure the resistance across R501.  If it is found High; (No short circuit), be sure that the C501 is damaged, a direct short happenened inside it; and it might be the reason for the failure of the fuse.  But; never stop there.  Check all the other capacitor/s ; out from circuit; means let it be there; but de-solder out one end of it and measure.  If found OK, solder it there again.  Before measuring these resistances, unplug the degauss posistor connection.  If the degauss possistor used is a three terminal one, unsolder it out from the circuit, till all other work has been finished.  Solder it into circuit after the service work has finished.  Otherwise, it will get damaged [ RT501.]

  Till there shows an extreme low resistance, check the main power switching [SMPS] transistor V513.  Measure its junction resistance [Collector to Emitter].  It should be very high up to the rate of Megohms.  If it is damaged, this transistor will show a dead short across the rectified DC voltage [measure in Ohms].  If so; unsolder it out from the circuit, then measure the forward and reverse resistance of each of the main rectifier diodes.

  Here one point should be keep in mind.  These four rectifier diodes are venerable to get shorted due to any voltage spike or a slight lightning stroke.  Even one among them found damaged,  replace the four of than at the same  time, otherwise there is a chance to get the others to be damaged by time.

If the main switching transistor if found damaged [Shorted]; surely the resistance R510 too have opened.  Check and replace it if found damaged.

In my opinion it will be best to replace other two small signal transistors 2SC3807 & 2SA1015 too.  It won’t cost more.  Replace the Zener diode VD519.  Never leave it there even for an experiment.

  If you have done all the checks stated above, and found the primary side [Live side] of this circuit OK, now it is time to check the secondary section.  Normally, secondary section circuit won’t have any problem at all.  The only problem I've found is with a busted photo-coupler.  So I advise you to replace this photo coupler and its control transistor [V533 - @Sc1815] too. 

Now trace out the B+ [110V] point.  Disconnect other loads from this line, and connect a 100W Filament type bulb [Filament type bulb only; not a CFL or any other].

  Unplug the AC fuse FU501 from its holder.  Solder two separate wires at both end of the fuse holder, and connect these wires to another bulb holder.  Insert a 100W filament type bulb there too.  This is a temporary protection procedure.  Now the filament of this bulb acts as a fuse of high resistance.  Let all the other connections, except the B+110V  connected.  No problem at all.

  Now plug the TV to AC mains wall socket, and switch it on.

  The first bulb connected across the fuse holder will light up bright at first, the bulb connected across the +B will light up faintly indicating that there is a low DC voltage. The the bulb connected across the fuse will light up brightly for a moment, and will get dimmed, while the bulb connected at the B+ will stay lighted constantly.  It should be.  Now measure the voltage across C561.  It should be constant. (at about 110VDC).  Keep in this condition for at least half an hour.  If no abnormality is noted, you can surely connect the load to B+ voltage, and can remove the bulb and holder from the fuse bracket, and insert the correct rated fuse.  The SMPS of your TV is now OK.

SMPS SCHEMATIC 

MC-261 - MICRO-SYSTEM – SCHEMATIC (Circuit Diagram) FULL

USED ICs: CD8227 – SA5888 – 5671-ALAA (SDRAM) – EK25P10 – HT1621-48SSOP – MC8IF 4316M – CD4052BC

POWER SUPPLY

DISPLAY

MAIN

PWB

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SAMSUNG BN-96 SCHEMATIC - Bordeaux - Ver-1 and Ver2 - LCD TV SMPS

Samsung LCD TV_26" & 32" Power Supply Regulator Circuit Diagram [Bordeaux]

Used ICs: LTV817B - TLP421 – VIPER22ADIP – TDA4863 – KIA27BR12 – MC33167 – BCVB2A – F9222L (BORDEAUX 26” LCD TV) & BORDEAUX 32” LCD TV)

VERSION-1

VERSION-2

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PS42D - SAMSUNG PLASMA DISPLAY SMPS - VOLTAGES - DETAILS

SAMSUNG PS42D5SX/XEC_PS42D5SX/XSG_PS42D5SX/XTL _ SMPS [Power supply regulator board] – VOLTAGES – PROTECTIONS

SAMSUNG 42" & 50" PLASMA TV - SMPS OUTLINE

   Considering various related conditions, the switching regulator with good efficiency and allowing for its small size and light weight was used as the power supply for PDP 42" (Schubert) / 50" (Strauss), VS requiring high power consumption Asymmetrical Half Bridge converter and fly back converter. To comply with the international harmonics standards and improve the power factor, active PFC (Power Factor Correction) was used to rectify AC input into +400V DC output, which in turns used as input to the switching regulator.

An output short circuit is defined as output impedance of less than 300Mohms.    The power supply shall shutdown and latch off for shorting VS DC rails to return. Shorts between main output rails and STD_5V shall not cause any damages to the power supply.  The power supply shall either shutdown and latch off for shorting is removed, the P/S shall recover. The power supply shall be capable of withstanding a continuous short-circuit to the output without damage or over stress to the unit (components, PCB traces, connectors, etc.) under the input conditions specified in Section 3 above. Current Protection as defined below.

   The over voltage sense circuitry and reference shall reside in package that are separate and distinct from the regulator control circuitry and reference. No single point fault shall be able to cause a sustained over voltage condition on any of all outputs. The supply shall provide latch-mode Over Voltage Protection as defined below.

INPUT

   The power supply shall be capable of supplying full rated output power over free voltage ranges that are rated 100 VAC - 240 VAC RMS nominal. Operating voltage : 90 VAC - 264 VAC The power supply must be able to start up under peak loading at 90VAC. The power supply shall automatically recover from AC power loss. (Note that nominal voltages for test purposes are considered to be with +/- 1.0V of nominal).  STD_5V & Vpr2 (3.3V) is a SELV standby voltage that is always present when AC mains voltage present.

[Normally there is no repair to these SMPS boards, except for damaged or bulged main filter capacitor replacement.  It is advised to replace it as card basis.  After SMPS board replacement, Va & Vs voltages to display panel should be adjusted as per indication at the silk-screen at the panel.  These voltages will differ to panel to panel.]

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HOW TO TROUBLESHOOT SAMSUNG PS50C550 G1FXXY – 50inch PLASMA DISPLAY

PS50C550 G1FXXY – 50inch PLASMA DISPLAY - SAMSUNG 50" PLASMA DISPLAY _ Troubleshoot _ connector Voltages _ Troubleshooting Procedures by assembly.

Universal Remote Control Set-up Codes to check with Samsung Brand TVs [All types]

TROUBLESHOOTING BY ASSEMBLY

* SMPS-PDP TV > No power, Blank screen, the Relay repeats On and Off

* ASSY PDP P-X-MAIN BOARD > Blank screen

* ASSY PDP P-Y-MAIN BOARD > Blank screen

* ASSY BOARD P-TOUCH FUNCTION&IR > The side function key does not work properly.  The remote control does not work properly, the LED does not work properly.

* ASSY PCB MISC-MAIN > No Power, Abnormal screen for each input source, PIP screen trouble, Sound trouble

* ASSY PDP P-F-BUFFER BOARD > Corresponding Buffer Board block screen is blank

* ASSY PDP P-E-BUFFER BOARD > Corresponding Buffer Board block screen is blank

* ASSY PDP P-Y-MAIN BUFFER BOARD > Lower screen is blank

* ASSY PDP P-X-MAIN BUFFER BOARD > Upper screen is blank

* ASSY PDP P-LOGIC MAIN BOARD > Blank screen, Screen noise

SCREEN-SHOTS FOR DEFECTS & POSSIBLE CAUSES

A blank vertical cell (block) appears on the screen.

Address buffer defect  - Replace the corresponding upper/lower buffers (E, F) COF defect (burnt)
> Replace the module.

A green screen appears when the TV is turned on.

> The Scale is not resetting _ Replace the Main board.

The OSD box appears but there is no text. Incorrect program version

> Check the version of each program
> Replace the Main board

A blank upper (or lower) block appears on the screen. Upper/Lower Y Buffer defect

> Replace the corresponding upper/lower buffers.

Either the main or sub picture does not appear.

> Replace the Main board

A vertical green line appears on the screen.  The SMPS voltage is incorrect

> Adjust the SMPS voltage according to the voltage printed on the module label

Dim screen (blurred in red)  X-Main board defect

> Replace the X-Main board

Va & Vs voltage adjustment

After replacing the SMPS or PDP panel, you must adjust the voltage referring to the voltage label printed on the panel. (If you do not adjust the voltage, an abnormal discharge symptom may appear.)

CONNECTOR ROLE & PIN VOLTAGES

UNIVERSAL REMOTE CONTROL SET-UP CODES

0030 0049 0050 0066 0076 0101 0102 0119 0143 0152 0154 0166 0181 0195 0209 0217 0240 0307 0318 0365 0379 0414 0421 0488 0492 0601 0624 0637 0642 0827

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PS42D5SX - SAMSUNG PLASMA TV - FAULTS - WIRING DIAGRAM - CONNECTOR VOLTAGES

Samsung PS42D5SX/XEC - PS42D5SX/XSG - PS42D5SX/XTL Plasma Display TV - Common Faults - Wiring Diagram _ Connector pin Voltages.

THE TV IS HOT

Since a PDP TV displays a picture on the screen by discharging plasma, operating for a long time may introduce heat onto the panel. The internal heat of the panel is sent to the vent on the upper part of the product, and users must take care not to touch the hot air from the vent.  The heat from the PDP TV does not indicate a defect or problem.

NOISE FROM THE TV

A PDP TV may produce sound at a certain level when operating the fan to cool its internal temperature. In addition, since the high-speed switching circuit and the high current may produce noise depending on the screen brightness change, a PDP TV produces more noise than a conventional CRT TV.

AFTER IMAGE REMAINS ON SCREEN

Due to the nature of PDP TVs, partial after-images may appear if a still picture is displayed for a certain period of time after connecting a video game console or a computer.  This is caused by brightness deterioration due to the storage effect of the panel, and to prevent this from happening, we recommend you reduce 'brightness' and 'contrast'.

RED OR BLACK SPOTS APPEARS ON THE SCREEN

A PDP TV uses a PDP panel consisting of 123million (SD Grade) ~ 315million (HD Grade) pixels. Although a PDP panel is a product that requires high technologies to integrate a few million pixels, a bright or dark pixel may exist on the panel, this does not affect the performance of the product.

BOUNDARY APPEARS ON THE SCREEN

Displaying a still picture on the screen may permanently damage the PDP panel.
A boundary may appear due to the difference in the transparency of the panel when watching the picture in the 4:3 aspect ratios for a long time and the picture in the left, right and center screens is a still image.
A boundary may appear when watching a still picture from a DVD player or a video game console on the screen for a long time.

UNUSUAL LINES APPEARS

Keep the antenna away from the power cord or connectors if possible.

The SMPS relay repeatedly turns on and off by the protection function due to a defect on a board connected to the SMPS.

> Disconnect all cables from the SMPS, operate the SMPS alone and check if the SMPS works properly and if each voltage output is correct.
> If the symptom continues even when SMPS is operated alone, replace the SMPS.
> If the symptom is not observed when operating the SMPS alone, find any defective ASSYs by connecting the cables one by one.

[When separating and connecting the cables such as CN809 of the Main SMPS, CN1, CN2, CN3, CN4 and CN5 of DC-DC SMPS, CN of the X Drive Board, and CN of the Y Drive Board, a spark may be generated by the electric charge of the high capacity capacitor. Therefore, wait some time after separating the power cord from the unit.]

The SMPS relay or the LEDs on the front panel do not work when connecting the power cord if the cables are improperly connected or the Video Board or SMPS is out of order. In this case, check the following

* Check the internal cable connection status inside the unit.
* Check the fuses of each part.
* Check the output voltage of SMPS.
* Replace the Video Board

TROUBLESHOOTING PROCEDURES BY ASSEMBLY

OVERALL WIRING

The Main Board – SMPS - Power Button – Speaker - Function Board Wiring - Connector pin voltages

The Main Board - SMPS, Side A/V - Sub Tuner Board - Power Button -  Speaker Out Wiring.

SMPS MODULE WIRING

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SAMSUNG BN94-03052A - LCD TV POWER SUPPLY SCHEMATIC

BN94-03052A - SAMSUNG SMPS Circuit Diagram.

ICs Used: NCP1653 – SPW20N60C3 – FQA18N50V2 – VIPER22A – LM324 – TLP421GR – KA324 – L6598

SCHEMATIC

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POLAROID TLM-22601B – SERVICE MODE – PASSWORD SET – SMPS SCHEMATIC

Used ICs in SMPS _ FAN7602BMK (SMPS control) – 2SK101LS (SMPS switching) – EL817MC (Photo-coupler)

SERVICE MODE & PASSWORD RESET

Turn on the TV, press MENU key with remote control, then press number key 1  9  9  9. 
The factory mode [Service mode] screen will be displayed.
There is no need to adjust the white balance for this model.

PASSWORD SET

Change the 4-numeral parental control password. 

Three steps are required for changing the password. 

Enter Old Password > Enter New Password > Confirm New Password. Note: This item is only available in TV, Composite and S-Video source modes. 

The default password is [0 0 0 0]

PARENTAL CONTROL

Provide the parental Control (V-chip) function setting. Before entering the Parental Control sub-menu, user has to key in the password first. Then enter the Parental Lock item, User can modify the restricted table about MPAA or TV Rating respectively. While exiting the sub-menu, the parental control function is working.  The inhibitive channels or source signals can be un-lock through pressing the V-CHIP key on the remote control and then key in the correct password. Note: This feature is only available in TV, Composite and S-Video source modes.  (The default password is: [0 0 0 0]

Universal remote control set-up code 

{0343}

SMPS [POWER SUPPLY REGULATOR BOARD] CIRCUIT DIAGRAM

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