How to Check power supply in LG LCD

LG42LH50

POWER SUPPLY PWB _ LOW-VOLTAGE TEST

AC Should not be applied at any time while adding resistors or while unplugging connectors as damage to circuit PWB may occur.

a) The SMPS PWB “MUST” be producing STBY 5V on all of the pins 7, 8, 9 or 10 (5V).  If 5V Standby is not being generated, the SMPS PWB is defective and must be replaced. There is no need to continue with the next test.

(b) Unplug P2400 on the Main PWB.

TEST 1:

(1) Add a 100Ωresistor between (5V STBY) pin 7, 8, 9 or 10 and Pin 2 (PWR). Apply AC. This will turn on the power supply.

a) Check that the 24V and 12V power supplies are turned on,

• P201 (24V pins 17 and 18)

• P201 (12V pins 13 and 14)

(2) Remove AC power.

POWER SUPPLY PWB _ BACK-LIGHTS TEST

P2400 Connector disconnected from the MainPWB. Apply AC after adding jumper.

Continue if the 1^st test was OK. Leave original resistor in place.

(3) Add another 100Ωresistor between (5V) pin 7, 8, 9 or 10 and Pin 20 (INV On).

(4) Apply AC Power. Simulating a Power and Backlight On command.

Backlights Normal:

a) If normal, the backlights should turn on. SMPS OK.

Backlights Abnormal:

a) Recheck all connections.

b) Confirm the INV On/Off line pulling up to at least 3V.

REMOVE AC POWER:

c) Check the connections to the Backlights.

DO NOT check these when AC is applied as they carry 1200V each.

Note, either of the connections are unplugged, the backlights will not light.

POWER SUPPLY CONNECTOR-P201 VOLTAGE & DIODE CHECK

ADIM Pin 21 Fixed and not used.

PDIM Pin 24 can vary according to type of signal being processed and the OSD Back-light setting.

0.6V 0% to 3.3V 100%. Output from the video processor IC100.

Diode Mode values taken with all Connectors Removed.

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TCL SERVICE MODE

TCL SERVICE MODE AND SOFTWARE

ERVICE [FACTORY MODE]

• Enter the factory menu (can use the IR) and press the remote key [◄V-] to  “0’, press mute remote key, then press 9,7,3,5 remote key.


• Press [►] key to enter the sub-menu and press MENU key to return the main-menu.

ADJUSTMENTS

Adjust the temperature in CMP, VGA, AV.

Make sure the picture mode is set to “Stand”, the “Picture àBlack expand” on the user Menu is set to “OFF”. “Other àFlesh Tone & Adaptive Luma Control ” on 

the factory Menu is set to “OFF”. After Alignment, the entire item will change to “ON”

ADC ADJUST

• For CMP input, the test signal is 576i/50Hz,100%, 8 steps colour bar. Select the “Balance àRGB Calibrate” on the factory Menu, then press “à”, ADC adjust is finished after “OK” is displayed


• For VGA input, the test signal is 1024×768/60Hz white/black grid. Select the “Balance à RGB Calibrate” on the factory Menu, then press “à”, ADC adjust is finished after “OK” is displayed.

VGA ADJUST

• For VGA input, the test signal is 1024×768/60Hz 16 steps gray bar. Set the “Balance àTone” on factory menu to “Normal”:


• For the third step form the white bar, Adjust the value of White R,White G,White B, until the color temperature is x=280±5, y=290±5 Y > 220nit


• For the second step form the black bar, Adjust the value of GrayR, Gray G, Gray B, until the color temperature is x=280±5, y=290±5 Y < 25nit


• Repeat, until all is ok


• Adjust the value of Black level.

AV ADJUST

• For AV3 input, the test signal is PAL - 8 steps gray bar. Set the “Balance à Tone” on factory menu to “Normal”:


• For the third step form the white bar, Adjust the value of White R, White G, White B, until the color temperature is x=280±5 y=290±5 Y > 220nit


• For the second step form the black bar, Adjust the value of GrayR, Gray G, Gray B, until the color temperature is x=280±5 y=290±5 Y < 25nit R


• Repeat A&B, until all is ok


• Adjust the value of Black level.

CMP ADJUST

• For CMP input, the test signal is 576i/50Hz-16 steps gray bar. Set the “Balance à Tone” on factory menu to “Normal”:


• For the third step form the white bar, Adjust the value of White R, White G, White B, until the color temperature is x=280±5 y=290±5 Y > 220nit


• For the second step form the black bar, Adjust the value of GrayR, Gray G, Gray B, until the color temperature is x=280±5 y=290±5 Y < 25nit


• Repeat  until all is ok


• Adjust the value of Black level  

ANALOGUE BOARD SOFTWARE UPDATE

Prepare MTKTOOL UPDATE, update board, serial line.

1. Connect PC, update board, and J3 on the main board with serial line


2. Provide the STB +5V for main board


3. Open “MtkTool.exe” in MTK TOOL program, and set the parameter as below picture.


4. Press “Browse” for selecting the SW.


5. Press “Upgrade” to download the SW. It will be OK when it shows “100%”


6. After downloading SW, it will be long time for Initializing EEPROM.

Procedure - 2

Preparative is same with above.

• Set SYSTEM > Factory Key on factory MENU to OFF. Connect the device as below picture.


• Update the SW follow solution- (3), (4), (5), (6)

MAIN POWER SUPPLY SCHEMATIC{Click on Pictures to Zoom In}

TCL SERVICE MODE

TCL SERVICE MODE AND SOFTWARE

ERVICE [FACTORY MODE]

• Enter the factory menu (can use the IR) and press the remote key [◄V-] to  “0’, press mute remote key, then press 9,7,3,5 remote key.


• Press [►] key to enter the sub-menu and press MENU key to return the main-menu.

ADJUSTMENTS

Adjust the temperature in CMP, VGA, AV.

Make sure the picture mode is set to “Stand”, the “Picture àBlack expand” on the user Menu is set to “OFF”. “Other àFlesh Tone & Adaptive Luma Control ” on 

the factory Menu is set to “OFF”. After Alignment, the entire item will change to “ON”

ADC ADJUST

• For CMP input, the test signal is 576i/50Hz,100%, 8 steps colour bar. Select the “Balance àRGB Calibrate” on the factory Menu, then press “à”, ADC adjust is finished after “OK” is displayed


• For VGA input, the test signal is 1024×768/60Hz white/black grid. Select the “Balance à RGB Calibrate” on the factory Menu, then press “à”, ADC adjust is finished after “OK” is displayed.

VGA ADJUST

• For VGA input, the test signal is 1024×768/60Hz 16 steps gray bar. Set the “Balance àTone” on factory menu to “Normal”:


• For the third step form the white bar, Adjust the value of White R,White G,White B, until the color temperature is x=280±5, y=290±5 Y > 220nit


• For the second step form the black bar, Adjust the value of GrayR, Gray G, Gray B, until the color temperature is x=280±5, y=290±5 Y < 25nit


• Repeat, until all is ok


• Adjust the value of Black level.

AV ADJUST

• For AV3 input, the test signal is PAL - 8 steps gray bar. Set the “Balance à Tone” on factory menu to “Normal”:


• For the third step form the white bar, Adjust the value of White R, White G, White B, until the color temperature is x=280±5 y=290±5 Y > 220nit


• For the second step form the black bar, Adjust the value of GrayR, Gray G, Gray B, until the color temperature is x=280±5 y=290±5 Y < 25nit R


• Repeat A&B, until all is ok


• Adjust the value of Black level.

CMP ADJUST

• For CMP input, the test signal is 576i/50Hz-16 steps gray bar. Set the “Balance à Tone” on factory menu to “Normal”:


• For the third step form the white bar, Adjust the value of White R, White G, White B, until the color temperature is x=280±5 y=290±5 Y > 220nit


• For the second step form the black bar, Adjust the value of GrayR, Gray G, Gray B, until the color temperature is x=280±5 y=290±5 Y < 25nit


• Repeat  until all is ok


• Adjust the value of Black level  

ANALOGUE BOARD SOFTWARE UPDATE

Prepare MTKTOOL UPDATE, update board, serial line.

1. Connect PC, update board, and J3 on the main board with serial line


2. Provide the STB +5V for main board


3. Open “MtkTool.exe” in MTK TOOL program, and set the parameter as below picture.


4. Press “Browse” for selecting the SW.


5. Press “Upgrade” to download the SW. It will be OK when it shows “100%”


6. After downloading SW, it will be long time for Initializing EEPROM.

Procedure - 2

Preparative is same with above.

• Set SYSTEM > Factory Key on factory MENU to OFF. Connect the device as below picture.


• Update the SW follow solution- (3), (4), (5), (6)

MAIN POWER SUPPLY SCHEMATIC{Click on Pictures to Zoom In}

TCL Service Modes for LCD LED's

ERVICE [FACTORY MODE]

• Enter the factory menu (can use the IR) and press the remote key [◄V-] to  “0’, press mute remote key, then press 9,7,3,5 remote key.


• Press [►] key to enter the sub-menu and press MENU key to return the main-menu.

ADJUSTMENTS

Adjust the temperature in CMP, VGA, AV.

Make sure the picture mode is set to “Stand”, the “Picture àBlack expand” on the user Menu is set to “OFF”. “Other àFlesh Tone & Adaptive Luma Control ” on 

the factory Menu is set to “OFF”. After Alignment, the entire item will change to “ON”

ADC ADJUST

• For CMP input, the test signal is 576i/50Hz,100%, 8 steps colour bar. Select the “Balance àRGB Calibrate” on the factory Menu, then press “à”, ADC adjust is finished after “OK” is displayed


• For VGA input, the test signal is 1024×768/60Hz white/black grid. Select the “Balance à RGB Calibrate” on the factory Menu, then press “à”, ADC adjust is finished after “OK” is displayed.

VGA ADJUST

• For VGA input, the test signal is 1024×768/60Hz 16 steps gray bar. Set the “Balance àTone” on factory menu to “Normal”:


• For the third step form the white bar, Adjust the value of White R,White G,White B, until the color temperature is x=280±5, y=290±5 Y > 220nit


• For the second step form the black bar, Adjust the value of GrayR, Gray G, Gray B, until the color temperature is x=280±5, y=290±5 Y < 25nit


• Repeat, until all is ok


• Adjust the value of Black level.

AV ADJUST

• For AV3 input, the test signal is PAL - 8 steps gray bar. Set the “Balance à Tone” on factory menu to “Normal”:


• For the third step form the white bar, Adjust the value of White R, White G, White B, until the color temperature is x=280±5 y=290±5 Y > 220nit


• For the second step form the black bar, Adjust the value of GrayR, Gray G, Gray B, until the color temperature is x=280±5 y=290±5 Y < 25nit R


• Repeat A&B, until all is ok


• Adjust the value of Black level.

CMP ADJUST

• For CMP input, the test signal is 576i/50Hz-16 steps gray bar. Set the “Balance à Tone” on factory menu to “Normal”:


• For the third step form the white bar, Adjust the value of White R, White G, White B, until the color temperature is x=280±5 y=290±5 Y > 220nit


• For the second step form the black bar, Adjust the value of GrayR, Gray G, Gray B, until the color temperature is x=280±5 y=290±5 Y < 25nit


• Repeat  until all is ok


• Adjust the value of Black level  

ANALOGUE BOARD SOFTWARE UPDATE
Prepare MTKTOOL UPDATE, update board, serial line.

1. Connect PC, update board, and J3 on the main board with serial line


2. Provide the STB +5V for main board


3. Open “MtkTool.exe” in MTK TOOL program, and set the parameter as below picture.


4. Press “Browse” for selecting the SW.


5. Press “Upgrade” to download the SW. It will be OK when it shows “100%”


6. After downloading SW, it will be long time for Initializing EEPROM.

Procedure - 2
Preparative is same with above.

• Set SYSTEM > Factory Key on factory MENU to OFF. Connect the device as below picture.


• Update the SW follow solution- (3), (4), (5), (6)

MAIN POWER SUPPLY SCHEMATIC{Click on Pictures to Zoom In}

Samsung Service Codes

How To Get into The Samsung Service Menu

You can use the Samsung service menu, for such things as resetting the digital tuner, a total factory reset and enabling/disabling hotel mode. In this mode you must be careful as you can cause irreparable damage to your set.

Method 1

Put TV on standby and then push in series these buttons on the remote: 'info, menu, mute, power' the TV will then turn itself on and display a menu.

Method 2

Turn the power off. On the remote, press Mute followed by 1, 8, 2, Power in sequence.

Method 3

With the TV in standby, press the {DISPLAY} {P.STD} {MUTE} {POWER} on the remote.

Method 4

With the TV in standby, press the {SLEEP} {P.STD} {MUTE} {POWER} on the remote.

Method 5

With the TV in standby, press the {DISPLAY} {MENU} {MUTE} {POWER} on the remote.

Method 6

With the TV in standby. On the remote, press Mute followed by 1, 1, 9, Enter in sequence.

Samsung LCD Monitor Service Menu Instructions

1. Power on the lcd monitor and open the OSD menu.


2. Set the Brightness and Contrast to 0.


3. Then press and hold the "SOURCE or ENTER" button for 5 second until the "SERVICE FUNCTION MENU" pop-up.

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Sharp LCD TV Reset Lamps

Lamp Error Reset for Sharp LCD TV.




With power LED off (TV in fake standby or AC power plug removed) hold Vol- and SOURCE/INPUT. 
Power on the TV. Do not release the buttons. 

This may take up to 20 seconds.

Look for a letter "K" on the side of the screen when it powers up. If this appears, continue. If not, repeat the above procedure.

Press CH- and VOL- to access service menu. See if LAMP ERROR appears in listing. If so, then a reset procedure is necessary

Page through the menus looking for "L ERR RESET". Execute the option (highlight and press OK.)

Power off the TV (TV in fake standby or AC power plug removed)

Hold Vol- and SOURCE/INPUT. 

Power on the TV. Do not release the buttons. 

No "K" should appear.

Power off the TV.

The TV should now be fixed.

LG 32LC56

 

Symptom: UNSCHEDULED message and not tune in any channels or see anything through any entrance



 







Solution fault: I thought
that could be a problem in the eeprom, the susutituyo but still the
same, I restore the values of manufactures by changing the value ID
other than 1, but neither meeting solution.

At the end by removing the integrated which is designated in the second
picture is solved (the photo is after removing it). I try to find
replacement but can not find anything, at the end I leave with nothing
but problems.