HITACHI WD7000-FD7000-FL7000 – How to enter Service Mode – Convergence Adjustment

C47-WD7000_C57-WD7000_C43-FD7000_C50-FD7000_C43-FL7000 –  Hitachi Projection TV - Service Mode _ Memory Initialize _ Convergence Adjustment _ SMPS schematic (Circuit Diagram) _ Convergence Adjustments

SERVICE MODE

* Receive signal on main picture, then turn off the main power.
* Press and hold the [TV/VIDEO] button on Control Panel and then Power ON to access service adjustment mode. (Hold the [TV/VIDEO] button until service menu appears.)
* Adjust required items by the following table. Select item by ▲ or ▼ button on remote handset and adjust by ► or ◄ button.
* Press [ENTER] button to memorize the value.

DEFAULT DATA VALUES

CONVERGENCE ADJUSTMENT (9 Point Manual Convergence)

1 Receive RF or Video signal.

2 Press and hold the MAGIC/MANUAL FOCUS button for more than 3 seconds to enter the MANUAL CONVERGENCE mode

3 Release the MAGIC/MANUAL FOCUS button

4 Press the ▲▼►◄ cursor buttons to select adjustment point, press the [ENTER] button to display frame of red, move the ▲▼►◄ cursor buttons to adjust red convergence for better.

> Press the [ENTER] button to display frame of blue, press the▲▼◄► cursor buttons to adjust blue convergence for better.
> Press the [ENTER] button to display frame of white, press the ▲▼◄► cursor buttons to select another adjustment point, then perform (1)~(2) to adjust.
> When adjustment is done, press the [MENU] button, then the following screen will display as below.

0 Cancel adjusted data and exit from adjustment mode.
1 Save your adjusted data and exit from adjustment mode.
2 Return to manual convergence mode.
3 Recall the adjusted data of the previous auto convergence and return to manual convergence mode.

[If there is no operation for 3 minutes from the remote control unit, the TV will exit from MANUAL CONVERGENCE mode.]

The remote control unit of CLE-959 as an example to illustrate, the remote control unit of CLE-956 has the same function

MEMORY INITIALIZE & MODEL SETUP

Memory initialize
When replacing signal P.W.B or EEPROM (I007), it requires perform Memory Initialize operation.

Link the PSRT(1) and PSRT(2) for longer than 3 seconds.
Wait until the OSD ‘1’ is displayed (It takes several 10 seconds.); this means initialization is completed and each settings become factory preset condition.
Do not unplug the outlet or perform any key operation until the initialization is completed.

Model Setup

After set the Items according to the following tables in Service Menu, Set to INIT3 by following method.  (The model is set up by this operation. And initial-setting values according to the model are set up by this operation. At the same time, each settings
become factory preset condition)
(a) Select item No.627(INIT3) in service menu and press and hold the [recall] key on the remote handset until the OSD background changes to yellow. (It takes about 3 seconds.)
(b) Wait until the OSD background color becomes normal (It takes several 10 seconds.) , this means initialization is completed and each settings become preset condition according to the model . [Do not unplug the outlet or perform any key operation until the initialization is completed.]

Check the setting state displayed on the upper right of a service menu.

SMPS SCHEMATIC

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HOOVER HNL9136-37S MACHINE - WASHER-DRYER - EXPLODED VIEW

Exploded View _ Hoover HNL9136 _ Washer Dryer

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SAMSUNG CZ 21V5MJ - TROUBLESHOOTING - From My SERVICE TABLE TODAY - Damaged D2499 Horizontal Output Transistor

DAMAGED D2499_Horizontal Output Transistor _ SAMSUNG CZ21V5MJ - Deflection Yoke Fault.

  The set received for repair, in dead condition.  As per information from party, they haven’t used it for a long time; at about 2 years or so; as there was nobody at home.  Might be; because, the set too looks so.  Whatever it may be; let me work with it.

I did plug the set to AC power and switched it ON.  Dead indeed.  But, the green power LED at the front panel of the TV lights up for a moment, and goes OFF.  That was all.  No symptom of software loading or any static EHT effect at the front of the screen.

As the power/standby LED lights up; at least for a moment, means the SMPS section circuit is working normally.

These sets have short circuit protection.  If a direct short circuit occurs at any stage at its main board, the SMPS circuit will shut down automatically.  That is what happening here.  There should be a short circuited component/s anywhere at the circuit board.  Where might it be?

The set gives me no time to measure any voltage points.  It shuts down, as soon as I switched it ON.

Disconnected the set from AC mains.  A meter test done to all suspected components.  Detected a damage with the Horizontal Output transistor.  Collector to Emitter leak [Direct shorted junction].

If this transistor (D2499) should get damaged, there are 4 possible causes. 

* 3k9pF [2000VDC] capacitor. [Free-wheeling capacitor] 

* Horizontal oscillator frequency. 

* Shorted winding inside the LOT  

* Shorted winding in the deflection yoke.

* The 3k9pF capacitor [connected to the collector terminal of the horizontal output transistor to Ground].  Either it might open or the solder terminal loose contact.  Checked it.  No loose contact.  The capacitor showed a value of 4k2pF, with capacitance meter test.  It's OK.

* Frequency of horizontal oscillation.  If this frequency go beyond a specific value, say if it changes very low or high; the horizontal output transistor will get damaged.  The normal frequency is 15.625kHz.  about +/- 2% deviation can be tolerated.  Not too much. 

 When the set receive a transmission, this frequency will get synchronized with the incoming RF signal, as  synchronizing pulses is being send by the TV transmitter along with video information;  to synchronize the picture at the TV end.  There are both horizontal & vertical sync: pulses are present along with the transmitting video signal.  At the TV end; the synchronization separator circuit; built within an IC, will separate these signals and will routed to horizontal and vertical oscillator section circuits of the TV set; to lock the picture rock-rigid.

Here my problem is how I can measure this frequency.

If I could measure it; the set should switch ON; and stay ON.

Here the set switches ON and shuts OFF due to the shorted horizontal output junction.  If I rectify this short-circuit, the set will stay switched ON and I can measure all other voltages.

I de-soldered out the horizontal output transistor from circuit board.  Switched ON the set, without horizontal output transistor.  

Now I can and did measure the DC [+B] supply voltage with volt-meter.  This 110VDC supply voltage was OK.

Plugged the set to AC, and switched it ON.

The power/standby LED now stay ON, just for 5 seconds and shuts OFF; indicating a software load up.

Measured the horizontal frequency at the base foil point of the horizontal output transistor.  Found OK.  15.596kHz.

Switched OFF the set.  Soldered a new horizontal output transistor of same number in place. [D2499]

Plugged to AC power, and switched ON.

An EHT static felt at the front of the screen; but, within 10 seconds the transistor became very hot.

Either LOT or the deflection Yoke might be the reason.

Disconnected the deflection yoke plug from the main board.

Pulled out the CRT base card from the CRT neck and kept it securely without making any short circuit to it with any other components on board.

Switched ON the set, after plugging it to AC mains.

Checked the heat of the horizontal output transistor after 5 seconds.  It was normal. 

Means, the deflection yoke have the fault.  If the fault was within the LOT, the transistor might have heat up this time too.  It is difficult to detect the winding short, either to LOT or deflection yoke.  The only way is to check it by replacing with an other good one of same number.

I too did it.

Switched ON the set.  OK.

On checking, the deflection yoke the winding of it have corroded.  Might have short inside in between adjacent turns.  That was the fault.

VIDEOCON CTV14TP - Troubleshooting - From My SERVICE TABLE TODAY- Red color predominant screen _ with Retrace Lines

Red color predominant screen; even to Menu Screen – ABL section control voltage do not change according to the scene brightness changes _ thick horizontal bars; rolling downward and upward _ thin retrace lines along with picture – VIDEOCON- CTV14TP

Fault condition 

  ABL [Automatic Brightness Limiter] voltage seems to be almost constant.  The picture seems to be smeared, with excess red tone, retrace lines even with menu screen.  Instead of blue back-ground, it displays RED. Checked all the components at the ABL section, referring to its circuit diagram.  A zener diode connected to the ABL track at the CRT base card was found leaky.  Changed the Zener diode [9.1V].  ABL voltage became normal, and began to change according to the intensity of the picture brightness, but, the red color was excess.  

  Checked all the thee cathode voltage at CRT base pins.  The voltage to red-cathode was found abnormal [much less – with a difference of 25V with respect to other two [blue & green] cathodes.  Checked all the video output transistors at the CRT base card.  Three of them.  All are found OK, with meter check.  De-soldered out the transistor [red drive] and checked it out of circuit.  There was a slight short detected between collector and base to that transistor, measuring it at MegOhm range.  Desoldered out the blue drive transistor from the CRT base card, and checked it.  The same number, but did not show any leak when measured at the same MegOhm range.

  Replaced the Red drive transistor with a new one of same number, and inserted the blue drive transistor in place, and switched  ON the set.

Measured all the three cathode voltages; and found normal.  The color too has displayed well.

Faulty displays before repair.  Color of the picture changes as the screen changes; due to absense of  ABL control voltage.

After repair

These pictures might have some imperfections as all of it has been shot by my Mobile phone

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PHILIPS 21PT138A-94R – Troubleshooting - FROM My SERVICE TABLE - Today

Raster height is less with a horizontal line across the middle of it_Vertical Scan output section circuit fault – Philips 21PT138A/94R CRT TV

  Fault:  The screen narrowed [at about 7 inches in height at the center] (See the picture )  A horizontal line across the center of the screen and it expanded vertically to both top and bottom.  Lack of vertical scan pulse amplitude detected with Fluke scope-meter.

Vertical scan output IC used is TDA3653.  PT138A  Chassis.  Normally it seems to be a vertical scan output IC fault; but was not.
  Low input voltage measured at Pin-9 of this IC.  Instead of 26.0VDC, an extreme low voltage of 8.9VDC measured.  Checked all the related components, including capacitors and resistors.   On checking, the carbon film resistor [used as a fuse resistor of 1 oHms measured a value of about 50 oHms.  That was the fault.  Replaced that resistor, checked OK.

  Resistor 3449, that connected between the coil 5449 which in turn connected to pin-6 of Line Output Transformer [LOT]; which generates the 26VDC to vertical scan output section circuit.
 It took around 25 minutes to locate the exact fault location and to pinpoint the  damaged component on circuit board.

Troubleshooting procedure that I've done according to my service experience.  It might be different to an other person.

  As the set has light at screen, and there is no unusual Hissing or cracking sound; it is clear that its horizontal section circuit is OK.  Otherwise, there will be no symptom of light.  Here the screen do not fill vertically; but it do fill horizontally; as you can see the attached photo of the faulty screen below. 

Something wrong with the vertical scan out section circuit.  Might be IC damage, loose solder terminal/s or any other reason.

  With this set, vertical scan out section circuit is built around the IC TDA3653C.  It has 9 solder terminals.  Pin-9 is its main supply input, pin-5 is the vertical scan output and pin-4 is the Ground for vertical scan output section fabricated inside the IC.

  I've checked all the solder terminals at the vertical scan output section  circuit for any loose solder.  All found OK.

Powered ON the set. Measured the voltage at the IC pins.

 Measured the input voltage at pin-9 of the IC.  Found very low; at about 9VDC or so, and it was fluctuating too.  There should be around a steady 26VDC normally.

Suspected a short circuit within the IC.

Unplugged the set from AC mains.

 Measured the resistance[multi-meter set to measure Ohms]; between pin-4 [GND] of the IC to pin 9 [+] voltage input.

No short circuit symptom.

 Reversed the meter prod polarity, and measured it again.  No problem at all.  I used an analogue multi-meter [Sanwa YX360TRF] to detect the fault.

 Sucked out all the solder at pin-9 of the IC; using a solder sucker; to isolate the connection to that pin from the rest of the circuit.

Switched ON the set.

 Measured the voltage at the print foil of pin-9 of the IC.  Was found OK. 26.8VDC now.

Disconnected AC.

Soldered the pin-9 again to circuit.

 Switched ON the set.  The voltage dropped to 9V again.  Something wrong with the 26V supply line.  When it loads, the voltage drops.

Concentrated to that supply line.

 This 26V is generated by one among the winding at the LOT, at pin number 6 of it.

Checked the rectifier diode used there.  Was found OK.  No reverse leak at all; even at MegOhm range.

Checked the resistor connected in series.  Measured an abnormal value.  More than 50oHms. 

Referred the schematic.  It was marked as 1oHm 2W; Carbon Film [CF] type.

Replaced it with a new one.  Checked OK.

Checked the heating effect of the IC, for an hour use.  No overheating. Picture was perfect without any vertical rolling.  Vertical height and linearity too was perfect.

That was all.

Voltages at pins of TDA3653; at perfect working condition.

Pin-1 > free

Pin-2 > Ground

Pin-3 > 1.3V

Pin-4 > Ground

Pin-5 > 13V

Pin-6 > 26V

Pin-7 > 0V

Pin-8 > 5V

Pin-9 > 26V.

See the photos.

Faulty Screen 

CHASSIS

LOCATION OF THE FAULTY COMPONENT (Marked in Red rectangle)

FAULTY COMPONENT

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TOSHIBA 19AV605PR - 19 Inch COMPUTER MONITOR SCHEMATIC - SMPS and BACK LIGHT

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SMPS CIRCUIT DIAGRAM

BACK LIGHT INVERTER CIRCUIT DIAGRAM

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A6652 - MICROLAB COMPUTER SPEAKER SYSTEM - SCHEMATIC

MICROLAB A-6652 _ Computer Speaker System Circuit Diagram  _ Used ICs - VFD 10-BT-245GNKP (Display Module) – PT6311 (Display Drive) – SN1604 (System control) – 24C01 (System Memory) – 4558 (Pre amp) – LM4731 ( Dual Power Amp) – PT2322 (Signal Processor Control)

FRONT CONTROL & DISPLAY CIRCUIT

SIGNAL PROCESSOR CIRCUIT

POWER AMPLIFIER CIRCUIT

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MICROLAB COMPUTER SPEAKER SYSTEMS M800 & SOLO1MK2 _ Used ICs  M800 2.1 - TDA2030_TDA4558  SOLO1MK2 - TDA4558 _ TDA7265

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