LG XD Ultraslim CRT TV 29FU1RL- RG - RLD SMPS DEFLECTION and SYSTEM CONTROL CHROMA JUNGLE - SCHEMATIC

FBT BSC26-N2138 D16 110V

Switching transformer EER4942 300UH

Linearity Coil  HL-1520S-26.5uH 26.5uH 50V 4A

ICs used STV9326_LF353N_C6090_STR-X6556_STR-A6151

SMPS SCHEMATIC

DEFLECTION

SYSCON-CHROMA

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SONY Trinitron KVG14Q2 Repair Help FROM MY SERVICE TABLE TODAY

TDA8374A (Chroma)_STR S6707 (SMPS switching)_LA7830 (Vertical Scan Output IC)_ Sharp PQ 09RE 11 (9V controlled voltage regulator IC) _ 2SD1877 (Horizontal Scan Output Transistor)_NX1733/m (FBT/LOT)

Set received for repair with no picture condition; today.

On power ON, the standby LED blinks 3 times and then shuts off.

As the standby LED blinks, at least once time, it is clear that the SMPS section circuit to this set is working properly. 

But, the main system control micro-computer IC detects something short circuit with any component/s at the main board.

As the set is a very old model, the spare part availability will be somewhat difficult.  So; I should take much care with work; not to damage more components. 

I opened the back cover.  A visual inspection is done for any damaged component/s on-board.  Such as bulged/shorted capacitors, damaged IC/s and such.

I found that the vertical scan output IC is cracked.  I’ve attached the photo of the same here.

Checked all other main components, which can likely to be faulty; using multi-meter.  Checked the Horizontal Output Transistor for any leak with its junction The Horizontal Output Transistor used with this set is D1877.  I did notice, it is the original one fitted by the company.  Nobody have replaced it.  We can detect this by inspecting its solder terminals.

Yet, de-soldered it out from the circuit board, and checked it alone using meter set to KOhms range.  No abnormal measurement noticed.  De-soldered it into place again.  Screwed it on to its heat sink.

De-soldered out the damaged vertical scan output IC from the circuit board.

Switched ON the set without it.

The standby LED lighted up once, then 3 times and OFF, as before.

[With this set’s circuit, it won’t switch ON properly, or produce EHT or even a horizontal line will appear on the screen, as other company’s sets will; except the +B voltage [112VDC] only will be present.

I did check the +B112VDC.  It was OK.  No fluctuations.  Checked the voltage at the primary  winding of the line drive transformer, and at the collector terminals of the Line Drive Transistor.  All found OK.

Switched OFF the set, and checked all the solder terminals at the solder side of the PWB, once more; using a magnifying glass.

After some time, at about 25 minutes, I detected a minute loose solder terminal at the 9V voltage regulator IC.  This IC has 4 solder terminals.  It is a controlled voltage regulator, which in turn controlled by the main microcomputer IC.  If the microcomputer IC detect any short circuit anywhere at the circuit board, it will shut down the control voltage to this IC; and it will down the 9VDC, which goes to the main chroma oscillator jungle IC [TDA8374A], and that was happening here.

But here there were two faults.  The loose solder terminal at the regulator IC said above (IC521 Pin-1).  The vertical scan output IC (LA7830) short.

Re-checked all the solder terminals at the main board to make sure that there are no other loose solder terminals.

Set switched on; fed to RF signal [On-Air].  Tuned it.  OK.

VIDEOCON 21 inch CTV REPAIR HELP From MY SERVICE TABLE TODAY - Retrace Lines all over the screen

Retrace lines all over the screen _ High brightness _ Audio OK _ Faint picture 

FBT Number to this set is BSC24-01N 4013E

In most cases, there are two reasons for this retrace lines.  The first one is with a high screen voltage.  In rare cases, the screen-pot meter [built inside the FBT] might be faulty.  If so, there is no repair to this fault, other than replace the FBT/ [LOT].

The second possibility is reduced video output stage supply voltage.  This voltage is generated by one among the winding of the FBT.  For some sets, it will be from the main SMPS section itself.  This supply voltage may vary from 280VDC to 290VDC.  It will depend upon the model & circuit of the TV. The most probable reason for a low video output stage supply voltage is, either the diode that rectifies this voltage at the FBT winding end is faulty; or the smoothing capacitor used with this DC supply line has open.  The capacitor used here might be 10MFD to 22MFD; electrolytic type of high voltage rating.  Usually it will be 10MFD350VDC.

If this capacitor is open, the DC voltage will drop considerably, causing a very low voltage at the cathodes of the CRT gun; which in turn make it high emitting (electron) state, causing a screen of too high intensity along with vertical retrace lines.  The lines will appear across the screen; all over it, at a space of 1 or 2 inches.  They will be slightly slanted too; in position.  I've attached the photograph of the effected TV screen here.

 What I did first is to check the supply voltage to the video output section [CRT base card].  It was found normal here. And the fault should be of an abnormal screen voltage. 

 When I noticed closely to the screen, there is a very faint picture, but, it was or normal in size.  Slightly expanded than normal.

 The +B voltage from the SMPS section should be suspected.  I did check it.  According to the schematic, it should be 108.5VDC at load.

But, here it shows about 117.7VDC.  Much more than normal.  Adjusted it.  There is a pot-meter on board at the SMPS stage circuit to this set.  It can be adjusted.  The SMPS of this set is an adjustable type, not auto.

Ahh:  It worked fine.  No other adjustments have to do here.  Cleaned the inside of the set and circuit board using hot air blower.  My work is over.  Delivered after 2 hours check.

AFTER THE ADJUSTMENT

SCREEN POT-METER POSITION Here I haven't adjusted it any more

V GUARD DELUXE50 FIRDGE STABILIZER – Repair Help Fom MY SERVICE TABLE TODAY

V-Guard Fridge Stabilizer Deluxe 50 - Dead - No Input & output LED lights up.  No output voltage.

Condition : Dead.  No input or output LED light up.

Used a pre-programmed IC CTM1273 to control the circuit board PWB.

On checking, the thermal fuse found damaged.

 Replaced the thermal fuse (inserted inside the primary side of the transformer).  Power light came alive, but there was no output LED light up; or any output voltage; even after 5 minute duration.

Checked the components on circuit board.  The relay used (on board) HJR-3FF-S-2 was found not working.  It's winding was open.  Replaced the same; and checked OK.

  When checking this stabilizer, please check the AC fuse [the thermal fuse in the transformer] first; then the Relay.  This fuse can be replaced. Pull that fuse out (after de-solder its two connections).  Insert a new  one in place and solder the terminals as it was.  I’ve marked both the damaged component that I’ve replaced.  Note the photographs attached.

If the pre-programmed IC said above is found damaged, contact the authorized service center for V-Guard.  There is no way to get it from open electronic spare part market.

KONKA LED lcd tv 32F3000C SUPRA STV LCS26740 - TV SCHEMATIC POWER and BACKLIGHT INVERTER

SMPS & Back-light Inverter Circuit Diagram _ Konka LED LCD TV

Used ICs MT8227_MX25L3206_TDA19283_SY8009A_FR9888_OZ9902C_FAN6755W

SMPS SCHEMATIC

LED BACK-LIGHT INVERTER SCHEMATIC

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LG HT306SF Power Supply and Power Amp circuit diagram _ Firmware Update

LG HT306SF – HT306SH36F-S – HT306SH36SUW Home Theater System – Firmware Upgrade _ Power Amp & SMPS (Power Supply) Schematic. USED ICs  LC87F5M64A_M24C16_TAS 5352

HOW TO ENTER SYSTEM INFORMATION

* Enter into SETUP menu with NO Disc  in the tray.
* Put on cursor [Highlight] 16:9 wide option of TV aspect in SETUP menu.
* Press follow key in continuous using remote control. 1 > 3 > 9 > 7 > 1 > 3 > 9 > ENTER

HOW TO UPDATE THE DVD and AUDIO MICOM PROGRAMS

The Whole Sequence

> DVD program download.
> Power cord Out > In.
> Audio micom program download.
> Remote control Pause key ‘||’ + ‘1472’ for input options.
> Enter into the system information for check the version, options and check sum.
> Power Off > On.

HOW TO UPDATE THE MTK-DVD PROGRAM

* Change the filename to download as “LG_(MODEL NAME).ROM”.   [Both Upper and Lower case In filename is possible]  Ex.) HT306: “LG_HT306.ROM”
* Copy the file to the formatted USB, and burn it.
* Move to the USB function, and insert the USB to the set.  The upgrade information will be shown on the screen.
* Remove the USB, press PLAY key of the remote control.
* Remove and reconnect the power cable when it changes to logo screen from upgrade information. Then the upgrade process is completed.

HOW TO UPDATE THE AUDIO-MICOM PROGRAM

> Change the filename to download as “(MODEL NAME)_(Version).HEX”. Only upper cases are permitted.  Ex.) HT306: "HT306_0809262.HEX"
> Copy the file to the root folder of USB storage.
> Put the USB into the SET, and move to the USB function.  Then the upgrade process will be started with the upgrade information.
> If the upgrade process is complete, the set will be power off automatically with “Complete” message.

HOW TO CLEAN THE LENS

If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cotton swab should be used, taking care not to distort lens.

Never attempt to disassemble the pick-up.
Spring has excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab.  (Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.

POWER Supply & POWER Aamplifier CIRCUIT DIAGRAM [SCHEMATIC]

Power PWB Top & Bottom view

POWER AMP 

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LG DU34FZ20 - SMPS and DEFLECTION SECTION SCHEMATICS

Horizontal & Vertical Scan section and SMPS circuit diagrams _ LG DU34FZ20  (USA & CANADA)

SMPS & DEFLECTION SCHEMATIC

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THOMSON 52W610 HOW TO ENTER SERVICE MODE - CONVERGENCE ADJUSTMENTS

Service mode & convergence adjustments _ Thomson 52TW610_ 52” Projection TV [PRTV]

SERVICE MODE

* Switch the TV into “Standby” mode by pressing the Standby button on the RCU.  Wait till the TV goes into the standby.
* Press the VOL(--)button and then the PR(--)button on the TV keyboard.  Hold them down for more than 8 seconds.
* After the normal switch on time, when the 8 seconds have elapsed, the main service menu appears on the screen.

* Press Exit on the Remote control.

Everyday use menu can be accessed via Menu button. (Text and EPG not available)

Field Service Menu can be re-entered via Blue button.

In service mode
> The child lock function is re-initialized
> Clear any wake-up/sleep/memo/EPG timers
> Pin 8 of the scart plug has to be ignored.
> AV- Link WSS detection and letterbox detection (autoformat) have to be disabled.
> EPG and TELETEXT have to be disabled.
> Automatic standby functions, in case of no antenna signal have to be disabled.
> All passwords have to disabled.
> Installation Mode disabled.
> Default format and zoom.
> The Chassis Variant will be checked and stored

CONVERGENCE ADJUSTMENT PROCEDURE

For every point on the screen, each of the three beams has a specific correction possibility in both horizontal and vertical planes. To achieve this, three levels of adjustment are available in the Service Mode. The unit is also equipped with an alignment grid pattern generator incorporated on the convergence circuit board.  

IN SERVICE MODE Select the “CONVERGENCE”

Select “LEVEL 1,2 or 3” menu line and LEVEL 1,2 or 3 ALIGNMENT menu will appear.

LEVEL 1 ALIGNMENT MENU

* Press the“ OK” button on the RCU to activate the Red-Green test grid pattern.
* Confirm that the Green geometry is correct.Green adjustable only at level 2 and 3.
* Press the“ RED” button on the RCU to activate the red test grid, the cursor will be set to the centre point on the red grid.
* Using the“ NAVIGATION” (“ up,“” down,“ ” left and “” right) buttons on the RCU, align the red central cursor position to the green centre grid reference point.  A long press on the associated“ NAVIGATION” button on the RCU will accelerate the step size of the adjustment.
* Press the“ OK” button on the RCU to advance to the next cursor position and repeat the alignment process until all twenty five (9th = screen bottom left) alignment position have been checked.
* Press the“ EXIT” button on the RCU to return to“ Level 1” menu.
* Select” RETURN” on the menu.
* Next select“ STORE” on the convergence menu.
Repeat the alignment procedure for“ BLUE” in pressing the blue button to activate blue-green test grid pattern.

LEVEL 2 ALIGNMENT MENU

> Press the“ OK” button on the RCU to activate the Green test grid pattern, this is used throughout the alignment procedure as a reference.
> Confirm that the Green geometry is correct.
> Press the“RED” button on the RCU to activate the red test grid, the cursor will be set to the centre point on the red grid.
> Using the“ NAVIGATION” (“up,“” down,“” left and “” right) buttons on the RCU, align the red central cursor position to the green center grid reference point.  A long press on the associated “NAVIGATION” button on the RCU will accelerate the step size of the adjustment.
> Press the“ OK” button on the RCU to advance to the next cursor position and repeat the alignment process until all twenty five (25th = screen bottom left) alignment position have been checked.

> Press the“ EXIT” button on the RCU to return to“ Level 2” menu.
> Select” RETURN” on the menu.
> Next select“ STORE” on the convergence menu.
Repeat the alignment procedure for“ BLUE

LEVEL 3 ALIGNMENT

Each one of the 195 alignment point can be reached by Using the NUMERICAL buttons 2 (up), 8 (down), 6 (right) and 4 (left) on the RCU to position the cursor on the screen.
Convergence alignment is done using the“ NAVIGATION” (“up,“ ” down,“” left and“” right) buttons on the RCU.
* Press the“EXIT” button on the RCU to return to“ Level 3” menu.
* Select “RETURN” on the menu.
* Next select “STORE” on the convergence menu.

[Once “Level 3” alignment is completed, do not use“ Level 2” otherwise all adjustments made in“ Level 3” will be ERASED.]

Convergence defaults
If the convergence alignment is completely wrong most adjustments can be made starting with the factory convergence values, these are stored in the NVM as default values.  Default Red/Green/Blue:All of the colours convergence default. Values are stored in the Convergence RAM IC.
Default Red
Default Green
Default Blue
Restore: copies the last stored values from the NVM to the convergence RAM IC.
Store: Copies all Convergence RAM values to the NVM.

TCL and THOMSON LCD TV SMPS and INVERTER SCHEMATIC 01 LS182C0 PWB

POWER SUPPLY (SMPS) & INVERTER SCHEMATIC _ ICs USED – L6562D  FSQ510  SG3525A  UC3245BN  LM358  F8222 _ TCL & THOMSON LCD TVs

SMPS SCHEMATIC 01-LS182C0-PWB

INVERTER CONTROL

24V&INVERTER

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JVC AV30W475 - CRT TV - SMPS CIRCUIT DIAGRAM - URC set up codes

SMPS Schematic & PWB SMPS part  at the Main Board_ JVC AV-30W475 - AV-30W475 _ CRT TV _ Universal remote control set-up codes to check with JVC brand TVs.

SMPS SCHEMATIC

PWB - SMPS PART at main board (Solder Side)

UNIVERSAL REMOTE CONTROL SET-UP CODES

0007 0018 0075 0103 0123 0154 0163 0170 0182 0214 0225 0409 0433 0465 0657 0670

GRUNDIG LCD TV - SMPS SCHEMATIC - FSP115 and FSP223 - Service Mode

FSP-115 & FSP-223 - SMPS_Grundig LCD TV 26GTX3000T
Universal remote control set-up codes to check with Grundig brand TVs

FSP-115 SCHEMATIC & PWB -Solder Side

FSP-223 SCHEMATIC & PWB - Solder Side.

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HOW TO ENTER SERVICE MODE

Calling up the Service Mode:
* Press button i (M).
* Enter the code number 8500

FUNCTIONS OF BUTTONS

M (i)  - Call up / exit the dialog center

▲▼ – call up the dialogue line [point mdnu]

OK – Call up menus

◄► - Changing the settings

(Z) or [<=] - Sub menu – back to the main menu

Main menu: Exit the service mode.
Universal remote control set-up codes

0018 0039 0049 0080 0090 0101 0119 0145 0152 0194 0195 0217 0221 0232 0233 0247 0250 0384 0407 0421 0454 0620 0637 0644 0658 0810 0813

HOW TO ADJUST CONVERGENCE - HITACHI Projection TVs _ WD7000 - FD7000 - FL7000

HITACHI Projection TVs _ WD7000 - FD7000 - FL7000 - Convergence for outside digital & Convergence data adjustment procedure

Convergence for Outside Signal function

1. Press Service Switch on POWER/DEF P.W.B then display "Normal Crosshatch"

2. Press [MENU] key on R/C, then display "Red + Green Crosshatch with Red Marker" or "Green Crosshatch with Green Marker" or "Blue + Green Crosshatch with Blue Marker"

3. Press [MENU] key on R/C again, then display "Normal Crosshatch on Main Picture"

4. Press [MENU] key on R/C again, then display "Cross Marker + Box Marker on Main Picture"

5. Press [MENU] key on R/C again, then display "only Box Marker on Main Picture"

6. Press [MENU] key on R/C again, then display "Normal Crosshatch" again.

[And repeat procedure 2) ~ 6) by each press [MENU] key on R/C]

Convergence Data Adjustment Method

This function can adjust convergence data of all of one line (or all of screen) at the same time, in CONVERGENCE ADJUSTMENT MODE.

> Press Service Switch on DEF/CONVER P.W.B. to set to CONVERGENCE ADJUSTMENT MODE, then display Normal Crosshatch with Adjustment Point Marker.

> Press [SUB] key on R/C, then Extra horizontal lines appeared as set to RATER POSITION ADJUSTMENT MODE.

If Adjustment Point is on center, by press cursor key on R/C, then Convergence Data of all of screen are exchanged at the same time.  By press [UP] [LEFT] key on R/C, move up (left) RED convergence data of all of screen.

If Adjustment Point is NOT on center, by press cursor key on R/C, then Convergence Data of all of one line that Adjustment Point Marker is existing are exchanged at the same time.

By press [UP] [LEFT] key on R/C, move up (left) RED convergence data of all of horizontal (vertical) line that Adjustment Point Marker is existing.

Press [SUB] key on R/C again to exit RATER POSITION ADJUSTMENT MODE