KDL37V4000 Sony LCD TV SMPS circuit diagram – 1-876-635-12-SE2AG

Used Semiconductors and ICs: 2SK3797(FET), FA5501AN, MCZ3001DB, MM1431, MIP2H2PC123Y22FZW(Standby Opto-coupler)

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PWB Component and Foil side

TCL LCD27K76 and TCL 40E040 SMPS schematics

TCL 27 inch and 40 inch LCD TVs power supply schematics

TCL 27K76 SMPS

TCL 40E040 SMPS

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Orion TV29LB929 – 29 inch LCD/LED TV – how to enter service mode, adjustments, SMPS and backlight inverter schematic

Power supply and back-light inverter circuit diagram, service mode, Hotel mode, Reset, white balance adjustment – Orion TV29LB929 LED LCD TV - Used ICs in power and back-light inverter section circuit => MIP2M40MSSCF, FA5640N-C6-TE3, FMV09N90E(SMPS Switching FET), BD8779EFV-E2 (Backlight voltage control) 

HOTEL MODE FUNCTION
To set the Hotel mode, please follow the steps below.
1. Press the MENU ---> 1147 button on the remote control
2. Press the DOWN button on the remote control
3. Select the "Setup" menu , then press ENTER button
4. Select the "Hotel Mode" menu, Select "On".
5. The Hotel mode setting menu will appear
6. Using the UP/DOWN button on the remote control, select the desired mode. Then press the ENTER button.
7. Using the LEFT/RIGHT button on the remote control, set the mode to desired setting.
8. The Hotel mode has now been set up.

To reset the Hotel mode, follow the steps below.
1. Press the MENU => 1147 button on the remote control.
2. Press the DOWN button on the remote control,
3. Select the "Setup" menu , then press ENTER button.
4. Select the "Hotel Mode" menu, Select "On".
5. The Hotel mode setting menu will appear.
6. Press the DOWN button on the remote control,
7. Select the Clear Lock menu "Clear Lock" menu then press ENTER button , then press ENTER button.
8. The setting items has now been returned to initial value

CHECK FOR THE FIRMWARE VERSION

This unit is provided with the following SERVICE MODES so you can repair, examine and adjust easily

Do not adjust after other items except "Version Info".
1. Check of the VERSION and SUM DATA on the screen.
1 : Press the MENU è1147 button on the remote control.
2 : Press the DOWN button on the remote control,
3 : Select the "Setup" menu , then press ENTER button.
4 : Select the "Version Info" menu, then press ENTER button.
5 : On the screen as shown in Fig:

ADJUSTMENT PROCEDURE

On-Screen Display Adjustment

1. Press the MENU => 1147 button on the remote control.

2. Press the DOWN button on the remote control

3. Select the "Video" menu, then press ENTER button on the remote control.

4. Select the "Color Temperature" menu , then press ENTER button on the remote control.

5. On the screen as shown in Fig:

PRINTED CIRCUIT BOARDS POWER (INSERTED PARTS)

SOLDER SIDE and POWER (CHIP MOUNTED PARTS)

SOLDER SIDE

SMPS and Back-light inverter board circuit diagram

WHITE BALANCE adjustments.
1. Place the set in Aging Test for more than 15 minutes.

2. Please select input About mode to adjust W/B.
3. Receive the gray scale pattern from the Pattern Generator.

4. Press the INPUT SELECT button on the remote control to set to the AV mode

5. Using the remote control, set the brightness and contrast to normal position.

6. Press the MENU è1147 button on the remote control.

7. Press the DOWN button on the remote control.

8. Select the "Video" menu, and then press ENTER button on the remote control

ENTER button on the remote control ENTER button on the remote control.

10. Press the UP/DOWN button on the remote control to select the "R Gain", "G Gain", "B Gain", "R Offset", "G Offset", "B Offset

11. Adjust the LEFT/RIGHT button on the remote control to whiten the R Gain, G Gain, B Gain, R Offset, G Offset B Offset at each step tone sections equally..

12. Perform the above adjustments 10 and 11 until the white color is achieved.

Assemble a HiQ guitar amplifier - circuit diagram – using 6L6 and 12AX7 vacuum tubes

RCA’s first version of this tube was an early octal base tube. Like most with this base it had a metal, rather than glass, envelope. Later versions, including the 6L6G, 6L6GA, 6L6GB, 5881, 5932, 7027, and the final version 6L6GC had glass envelopes, which made radiation cooling of the anode easier.  5881 is next to the 6L6GB. 

The 5881 should be ok with the plate voltages found in most guitar amplifiers designed for the 6L6GC but this is not guaranteed so you do risk blowing your 5881s if you put them in an amp designed for the 6L6GC.

The valve 5581 can be replaced with 6L6 and the substitution for 12AX7 is ECC83

Valves don’t usually ‘fail’; they just get weaker and weaker. The actual age of the tube is not important. It’s how much it has been played. If you play your amp regularly and it’s been a year or more since you had a valve change, it’s almost certainly time to treat yourself to a new set of valves. 

Don’t forget to buy  “matched output pair” valves. This is really important. The matched valves have been carefully selected to be a close match both in gain and bias current. If you’re going to change amp valves always choose ‘matched quads’ if you have four output tubes or ‘matched pairs’ if you only have two.

If your guitar valve amplifier is not sounding quite so good as the day you bought it, change amp valves to restore that beautiful sweet tone.  If it’s sounding a bit flat, thin and lacking in oomph, change amp valves on a regular basis if you want to keep your amp sounding its very best.

If you notice a loss in bottom-end and power, it’s most likely your power valves need replacing.  If you’re getting strange sounds coming from your amplifier, first turn your gain section up, and slowly turn the master volume down. 

If the noises continue after the master volume has been turned down, it’s most likely a power valve. If you turn the master volume down, and the noises disappear, it’s most likely a pre-amp valve.

 If you want to change amp valves always recommend changing the whole set while you are at. It only costs a little more and you know that everything is as it should be.

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Philips MCM275 Micro system - schematic

Philips MCM275 DVD micro system circuit diagram

Schematics - [Click on the schematics to magnify]

Britania micro system BS370 schematic

Used ICs: V5888, M5671-ALAA(SDRAM), MOD102, TA8227P, ET2313, CE5B

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Samsung CS29A5HT8X/BWT - E2PROM (IC902) Replacement, service mode, memory data, white balance adjustment

Samsung CS29A5HT8X, CS29A5HT8X/NWT, CS29A5HT8X/VWT, CZ21A8VW8X/ELS

When IC902 is replaced, all adjustment data revert to the initial values.  So, all adjustment values when servicing should be readjusted.
 After IC902 is replaced, connect the AC power supply cord.
 Turn the power switch ON.
 In stand-by, warm up the TV for at least 10 seconds.
 Power on the TV.
White Balance Adjustment
Select STANDARD from the menu.
2. Input an 100% White pattern.
3. Enter the “Service Mode”. (Refer to “4-8 Service Mode”)
4. Warm up the TV set at least for 30 minutes.
5. Input a Toshiba pattern signal.
6. Enter the “Video Adjust1”.
* Adjust “Sub Contrast” so that Y (luminance) becomes 40 ft ± 3.
* Use “Red Drive” and “ Blue Drive” to adjust High-Light (x : 290, y : 300)
* Adjust “Sub Bright” so that Y (luminance) becomes 1.3ft ± 0.3.
* Use “Red Cutoff” and “Blue Cutoff” to adjust Low-Light (x : 290, y : 300).
7. Adjust CA-100 so that the final adjustment value can be fixed.
8. Use the Channel Up/Down (▲/▼) buttons to move the cursor on the adjustment modes.
9. Use the Volume +/- buttons to change the adjustment value.

Service Mode

To enter the “Service Mode”, Press the remote-control keys in this sequence:

If you do not have Factory remote-control:

Use the Channel Up/Down buttons to move the cursor in the adjustment parameters.

* When CRT, CRT PCB, FBT, E2PROM (sometimes MICOM) is replaced, the adjustment values should be controlled.

* After the Service adjustment is completed, Do not select “Reset” in the service mode menu.

(After above procedure is done, power is on initially and the “Plug and Play” will be operated.)

Memory Data:  (A) DEFLECTION (GEOMETRIC ADJUSTMENT VALUE)