Friday, 13 August 2021

Mitsubishi LT-55154, LT- 40164, LT-46164, LT-55164, LT-46265, LT-55265 – How to enter the service mode, service mode adjustments, back-up and restore, reset and initialization and more

 

Always respect voltages. While some may not be dangerous in themselves, they can cause unexpected reactions that are best avoided. Before reaching into a powered TV set, it is best to test the high voltage insulation. It is easy to do, and is a good service precaution.

The VLP43, VLP43+ and VLP43++ chassis types. The specific models for each chassis type, dimensions and weight are listed below.



Cold Check
With the alternating current (AC) plug removed from the AC source, place a jumper across the two AC plug prongs. Connect one lead of an ohm meter to the AC plug and touch the other lead to each exposed metal part (i.e. antennas, handle bracket, metal cabinet, screw heads, metal overlay, control shafts, etc.), particularly any exposed metal part that has a return path to the chassis. The resistance of the exposed metal parts having a return path to the chassis should be a minimum of 1Meg Ohm. Any resistance below this value indicates an abnormal condition and requires corrective action.
2. Hot Check ...Use the circuit shown below to perform the hot check test.
1. Keep switch S1 open and connect the receiver to the measuring circuit. Immediately after connection, and with the switching devices of the receiver in their operating positions, measure the leakage current for both positions of switch S2.
2. Close switch S1, energizing the receiver. Immediately after closing switch S1, and with the switching devices of the receiver in their operating positions, measure the leakage current for both positions of switch S2. Repeat the current measurements of items 1 and 2 after the receiver has reached thermal stabilization. The leakage current must not exceed 0.5 milliamps (mA).



 REMOTE CONTROL USE FOR SERVICE
Many service functions and adjustments are accessed using the Remote Control.

OPTION MENU
1. Press the <MENU> button on the remote control.
2. Press the buttons <2-4-7-0>. The screen will display the Option Menu.
3. Press <EXIT> to quit.

SERVICE LEVEL INITIALIZATION
Service Level Initialization is used to restore all customer menu, video and audio settings to the original factory default condition.
1. Enter the Option Menu <MENU> <2-4-7-0>.
2. Select “Initialize” and <ENTER>

DEACTIVATE VUDU (Software Version 12.08 and higher)
This feature will deactivate the customer’s VUDU on-line subscription. It should be used before TV ownership is changed.
NOTE: This feature is independent of the Initialize function.
1. Enter the Option Menu <MENU><2-4-7-0>.
2. Select “Deactivate Vudu” and <ENTER>.
3. The “Deactivate Vudu” text will momentarily turn red.
4. Press <EXIT> to quit.
5. The TV will register as deactivated the next time it is connected to the internet.

DIGITAL SIGNAL INFORMATION
Information on the currently selected digital channel can be displayed on screen.
Note: A digital channel received using the Antenna Input must be selected first.
1. Select the Antenna Input and an active digital channel.
2. Enter the Option Menu <MENU> <2-4-7-0>.
3. Select “Digital Signal Strength” and <ENTER>.
4. Press <EXIT> to quit.


RESET / INITIALIZATION

Many customer generated symptoms, intermittent symptoms or no symptom found can be resolved by using the various Reset and Initialization options. Before visiting the customer’s home ask the customer 1st perform a System Reset by pressing the <POWER> button on the front panel and holding it for 8 seconds. If this does not resolve the issue, they can perform an A/V Reset by pressing the <INPUT> + <VOL e> buttons on the front panel at the same time and holding for 10 seconds. Then, if necessary, perform a user level Initialization by pressing <MENU><1-2-3> <ENTER> with the remote. The customer should be made aware when settings and/or options will be reset. For more information, see the chart below


BACKUP / RESTORE ISF SETTING

VLP43+ and VLP43++ models - If the customer has calibrated the ISF (ADV) video settings, the settings data can be backed up on a USB memory device. If the settings are lost due to a Reset or Initialization procedure, PWB-MAIN replacement or other reasons, the settings data can be restored.
Backup ISF Settings.
1. Insert a empty USB memory device into the USB slot.
2. Press the <MENU> button on the remote control. The Customer Menu will appear.
3. Press the <2-4-5-7> buttons. The Service Menu will appear.
4. Press the <0> button. The Data Selection Menu will appear. See below.

5 Use the <Up or Dn> buttons to select “BACKUP AND RESTORE ISF SETTING” and press <ENTER>.
6 Use the <Up or Dn> buttons to toggle to "Backup ISF Settings to USB” (Default)

7. While "Backup ISF Settings to USB” is displayed, press <ENTER>. The screen will flash the message "Backup completed."

8. Remove the USB memory device and store it in a safe place.
9. Press <MENU> to exit


Restore ISF Settings.
1. Insert the USB memory device with the backup data into the USB slot.
2. Press the <MENU> button on the remote control. The Customer Menu will appear.
3. Press the <2-4-5-7> buttons. The Service Menu will appear.
4. Press the <0> button. The Data Selection Menu will appear. See above.
5. Use the <Up or Dn> buttons to select “BACKUP AND RESTORE ISF SETTING” and press <ENTER>.
6. Use the <Up or Dn> buttons to toggle to “Restore ISF Settings From USB.”
WARNING: DO NOT press <ENTER> while "Backup ISF Settings to USB" is displayed. The data on the USB will be overwritten and lost.

7. While “Restore ISF Settings From USB” is displayed, press <ENTER>. The screen will flash the message "Restore completed." The TV will then turn off.

8. Remove the USB memory device before turning the TV back on.


To SET SCREEN SIZE

The same PWB-MAIN is used for different screen sizes within a chassis family. When a PWB-MAIN is replaced, the screen size must be set up. Failure to setup the correct screen size will result in poor picture performance.
1. Press the <MENU><2-4-5-7> buttons. The Service Menu will appear.
2. Press the <0> button. The Data Selection Menu will appear.
3. Use the <Up or Dn> buttons to select “SET SCREEN SIZE” and press <ENTER>.
4. Use the <Up or Dn> buttons to toggle to select the correct screen size and chassis of the model being serviced.
5. Press <ENTER>.
6. The Screen Size indication will flash Red momentarily to indicate the selection has been saved.


LED INDICATIONS AND SELF DIAGNOSTICS

The front panel Status LED provides an indication of the set’s operation and the possible cause of a malfunction.

A blinking red and yellow Status LED will indicate an Error Code that can help determine the cause of a circuit failure.
• The number of Red blinks indicates the value of the MSD (tens digit) of the Error Code.
• The number of Yellow blinks indicates the value of the LSD (ones digit) of the Error Code.
Example: If the Error Code is “27”, the LED will continuously blink Red two times, followed by blinking Yellow seven times.

To perform a System Reset, press and hold the side Power button for 10 seconds. Or, unplug the set for 10 seconds then restore power


Error codes and error code log

ERROR CODE LOG
The Error Code Log may be helpful to retrieve the code for an error that occurred in the past.
To access the Error Code Log: Press <MENU> <3-5-6-4>

Error Code Definitions
• PAGE - Current page number
• CURRENT TIME - total hours of operational use.
• USAGE TIME - usage hours when the error occurred.
• CODE - the specific Error Code that occurred.
• STATUS: HAPPENED - Indicates an error was recorded.
Press <CANCEL> to erase the Log.
NOTE: The Error Code Log is intended as a reference tool and is not meant to be used as a final determination of a defective part.


SOUND PROJECTOR TRANSDUCER TEST
This procedure will test will each of the TV’s speakers individually using an internal white noise generator.
1. Press the <MENU> button on the remote control. The Customer Menu will appear.
2. Press the <2-4-5-7> buttons. The Service Menu will appear.
3. Press the <0> button. The Data Selection Menu will appear. See below.

4. Use the <Up or Dn> buttons to select “SOUND PROJECTOR TRANSDUCER TEST” and press <ENTER>. The Sound Projector Transducer Test Menu will be displayed. A tone will automatically cycle from one speaker to the next as indicated on screen. Follow the instructions to manually cycle the tone.
5. Press <EXIT> or <MENU> to exit.
NOTE: The VLP43 chassis has 12 speakers. The menu will show 16 speakers with 4 greyed out.
The VLP43++ chassis includes left and right full range speakers.



Wednesday, 4 August 2021

Samsung UN43TU8000F Chassis: UWK00-How to discharge the capacitors before repair, How to disassemble and power troubleshooting

 

Applicable to: Samsung LED TVs: UN43TU8000F, UN50TU8000F, UN55TU8000F, UN65TU8000F, UN75TU8000F, UN85TU8000F

Before Removing SMPS board, Discharge Capacitors
• 43 inches

You have to discharge the SMPS by using service JIG across leads of Large Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.

• If LED ON > LED OFF discharge is completed.

Then verify voltage is less than 10Vdc across leads with Volt Meter.

Fig-50 inches
You have to discharge the SMPS by using service JIG across leads of Large Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
Discharge JIG
• If LED ON > LED OFF discharge is completed. Then verify voltage is less than 10Vdc across leads with Volt Meter.



55 inches
You have to discharge the SMPS by using service JIG across leads of Large Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
• If LED ON > LED OFF discharge is completed.

Then verify voltage is less than 10Vdc across leads with Volt Meter.

65 inches
You have to discharge the SMPS by using service JIG across leads of Large Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
Discharge JIG
• If LED ON > LED OFF discharge is completed.

Then verify voltage is less than 10Vdc across leads with Volt Meter.

75 inches
You have to discharge the SMPS by using service JIG across leads of Large Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
Discharge JIG
• If LED ON > LED OFF discharge is completed.

Then verify voltage is less than 10Vdc across leads with Volt Meter

85 inches
You have to discharge the SMPS by using service JIG across leads of Large Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
Discharge JIG
• If LED ON > LED OFF discharge is completed

Then verify voltage is less than 10Vdc across leads with Volt Meter.

Disassembly

1. Push and hold down BLU connector tab to release it’s panel lock connection.

2. Lift to release the lock tab on upper left side of Board. (Step 4 will assist)

3. Locate a notch in insulation sheet. (not all models)

1. Push and hold down BLU connector tab to release it’s panel lock connection.

2. Lift to release the lock tab on upper left side of Board. (Step 4 will assist)

3. Locate a notch in insulation sheet. (not all models)

4. Use Open Jig in notch to help release & smoothly slide SMPS to the Right. (While pushing BLU Tab & Releasing Lock Tab)

Power Troubleshooting

 FUNCTION/IR Control Test

1. Place TV in Power Standby
2. Check LED Status
3. If LED is OFF
 Check LED 1.7Vdc (pin 14 ) and VCC for 5Vdc (pin 4 )
→ If missing suspect Function Assy/Cable/Main board.
4. If LED is ON
 Check Switch Operation activates on screen display.

If missing:
 Check KEY_INPUT1 (pin 11 ) change to 0V with a command.
• If wrong voltage or no change:
 Check Switch for stuck or miss-operation.
5. Check IR (pin 10 ) operation with Standard Remote command changes. (5V to 3.3V effective DC)
6. Check SDA (pin 17 ), SCL (pin 15 ) for effective 5Vdc (after power on)
→ If missing suspect Function Assy/Cable Assy/Main Assy.

FUNCTION/IR Control Test of Function/Wi-Fi /BT Module

1. Place TV in Power Standby
2. Check LED Status
3. If LED is OFF
Check LED (pin 17 ) and VCC for 5Vdc (pin 7 )
→ If missing suspect Function Assy/Cable/Main board.
4. If LED is ON
Check Switch Operation activates on screen display.

If missing:
Check KEY_INPUT1 (pin 11 ) change to 0V with a command.
• If wrong voltage or no change:
 Check Switch for stuck or miss-operation.
5. Check IR (pin 10 ) operation with Standard Remote command changes. (5V to 3.3V effective DC)
6. Check SDA (pin 14 ), SCL (pin 13 ) for effective 5Vdc (after power on)
→ If missing suspect Function Assy/Cable Assy/Main Assy.

Power supply board (SMPS) connector voltages. – 43 and 50 inches

55 and 65 inches

75 and 85 inches


Sunday, 25 July 2021

Sanyo JCX2300K stereo receiver (Australia) – alignment-circuit diagram (Schematic)-STK-078 POWER IC

 

Alignment procedure



Schematic diagram – Tuner


Schematic diagram – power amplifier


Printed circuit board – Power amplifier and tuner




Sunday, 18 July 2021

LG Woofer amplifier SMPS schematic EAX65142702, EAX4877702 and SMPS schematics EAX64464302, EAX65100001

 

Woofer SMPS circuit diagram – EAX65142702

Woofer SMPS circuit diagram – EAX4877702

SMPS circuit diagram – EAX64464302

SMPS circuit diagram – EAX65100001


Monday, 21 June 2021

Sony Trinitron CRT TVs - KV14T1U, KV16WT1U, KV21T3U, KV2171U, KV14T1U, KV16WT1U, KV21T3U, KVM2171U – faults and checking points

 SONY Trinitron BE4 CHASSIS Faults, checking points and suspected components

SONY KV 14TE1 CHASSIS BE 4

Does not turn on, LED flashes 6 times.

Flash 6 corresponds to "Overvoltage / Over current Protection (Pin 52) high", on pin 52 of the processor it has 5V when it should have been 100mV, the protection circuit is armed. In this case, it was due to a short circuit in the line transformer.

Deviate the tuning voltage.  Remove the black plastic that is located between the pins and the metal housing of the TUNER.

SONY KV14ME1  BE-4A CHASSIS

Low sound and failure. 

Replace D408 (zener 6v8)

SONY KVM2171U  BE4A CHASSIS

No text, excessive width, poor gray scale.

NVM corruption. Replace IC002 new type ST24C02FB6 (875937032). Change C0255 from 47uF to 1000uF, add 5.6V zener from pin 8 IC002 (cathode) to earth, tighten earth spring around CRT in the shape of U.

Frame collapse. 

R622 (HT feed) o/c, R814 0.47R safety (frame feed) o/c.

SONY KV21T3U  BE4A CHASSIS

Volume goes to max, no remote or front control functions. 

Micro gets hot, replace Micro part no 875947506.

In the pic (blank video).

D722 (871999133) o/c on CRT.

Blank raster with flyback lines.

A1 voltage too high, replace LOPTx.

SONY KV16WT1U  BE4 CHASSIS

Frame collapse (no picture).

R814 0.46R 0.5W (121781111) o/c, IC501 TDA9302, C504 100uF 50V, also replace D501 RGP10GP (871930243) or may fail again.

Frame collapse.

DJ L807 wire link to LOPTx earth.

SONY KV14T1U

Dead.

LOPTr Q802 S2055N s/c, R615 0.46R (121737100) o/c, IC601 STRS5706 s/c.

Colour lines on top.

EEPROM IC002 ST24C02CB1 (875937032).

SONY KVM2171U  BE4A CHASSIS

No text, excessive width, poor gray scale.

NVM corruption. Replace IC002 new type ST24C02FB6 (875937032). Change C0255 from 47uF to 1000uF, add 5.6V zener from pin 8 IC002 (cathode) to earth, tighten earth spring around CRT in the shape of U.

Frame collapse.

R622 (HT feed) o/c, R814 0.47R safety (frame feed) o/c.

SONY KV21T3U. BE4A CHASSIS

Volume goes to max, no remote or front control functions. 

Micro gets hot, replace Micro part no 875947506.

In the pic (blank video).

D722 (871999133) o/c on CRT.

Blank raster with flyback lines.

A1 voltage too high, replace LOPTx.

SONY KV16WT1U.  BE4 CHASSIS

Frame collapse (no picture).

R814 0.46R 0.5W (121781111) o/c, IC501 TDA9302, C504 100uF 50V, also replace D501 RGP10GP (871930243) or may fail again.

Frame collapse.

DJ L807 wire link to LOPTx earth.

SONY KV14T1U. 

Dead.

LOPTr Q802 S2055N s/c, R615 0.46R (121737100) o/c, IC601 STRS5706 s/c.

Colour lines on top.

EEPROM IC002 ST24C02CB1 (875937032)


Tuesday, 15 June 2021

XOCECO LC42HK35 LCD TELEVISION – How to enter the service mode, software update, power board schematic

 

Panel 5203428504 V420H1-L11:  Remote control  6010Y05600  RC-Y56

Adjustments (MAIN BOARD 6HK0200110)

Connect all the boards according to wiring diagram, connect with power and observe the display.
Method for entering factory menu: press “
INPUT”, “2”, “5”, ”8” and “0” in turn to enter factory menu; press “CH+” and “CH-” to select adjustment items and press “VOL+” and “VOL-” to adjust value items, press “MENU” continuously to exit.
Method for software upgrading: enter factory menu and select “OPTION”, set ISP to 1 or insert jump wire J201, then you can upgrade the software on line. After upgrade, it needs to set ISP back to 0 or pull out jump wire J201. when software upgrade finish,  turn off the TV and then turn on, enter the factory menu and initialize the EEPROM (EEPROM-MEMORAY RECALL).

Initialization
The items are only for some units which have special demands. They do not need to be adjusted for normal units.
Enter factory menu, select “OPTION” and “HOTEL OPTION” sub-menu.

Adjustment for AFT and AGC of IF channel in TV
3.2.1 IF AFT adjustment
Turn on the TV then enter the factory menu, set IF VCO to 1, disconnect J601, adjust L610 to value 2.5V of TP603 (A face), then wed J601.
3.2.2 IF AGC adjustment
Input 172.25MHz RF signal of 60dB to RF terminal, adjust RP601 to value 3.3V of TP601 (A face) and there should be no obvious snowy picture. Increase the TV signal to 90dBV and it should be no obvious noisy.
3.3 White balance adjustment
3.3.1 HDMI white balance adjustment
a. Input VG-848 signal to HDMI: TIMING854(800*600/60Hz) 8 level gray scale of PAT920, adjust the balance with CA210.
b. Enter COLOR TEMP sub menu and select color temperature of standard (1000K), the value of coordinate is commend.
c. Fixed B OFF, adjust R OFF, G OFF to let the color coordinate of the second level be (280,290) (CPT panel) and the brightness be 2-10nit or so; Fixed B GAIN, adjust R GAIN, G GAIN to let the color coordinate of the seventh level be (280,290) (CPT panel). Repeat adjust R OFF, G OFF, R GAIN and G GAIN, until the color coordinate of the two level gray scale be (280,290) (CPT panel).
3.3.2 VGA/YPbPr/ AV white balance check and correct a. Connect VG-848 signal of VGA to VGA terminal and input TIMING854(800*600/60HZ) PATTERN921(16 gray levels), enter ADC ADJ sub menu, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels), check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according the method of 3.2.2.
b. connect VG-848 YPbPr signal to YPbPr terminal and input TIMING972(1080I/60Hz) PAT908 color bar(include back/white bars), enter submenu of ADC ADJ, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels), check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according the method of 3.2.2
c. Input AV signal(PM5518, 8 gray levels, PAL for Chinese and NTSC for America) to VIDEO 1 terminal, check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according the method of 3.2.2.
Note: it can’t set back to 1 once ALL COLOR changes to 0.
4 Performance check
4.1 TV function
Enter searching menu → auto search, connect RF-TV terminal with central signal source and check if the picture is normal, if there are channels be skipped. Check CCD and V-CHIP for America.
4.2 AV/S, YPbPr terminals
Input AV/S, YPbPr / YCbCr HD signal, check if it is normal.
4.3 VGA terminal
Insert VGA terminal, input VGA format signal of 640X480@60 Hz and check if the display is normal.
4.4 HDMI terminal
Insert HDMI terminal, input 640X480@60Hz signal, check if the display is normal. Check HDCP function.
4.5 check sound channel
Check the speaker and earphone of each channel.
4.6 RS232 terminal
Insert the earphone wire to COM port, check the long-distance control function with special test software.
4.7 other function check
Check the turn on/turn off timer, asleep timer, picture/sound mode, OSD, freeze/mute, stereo/SAP, magic picture, ect.
4.8 presetting before ex-factory.

The RF signal received by antenna will be sent to tuner TUNER601, then IF signal will be obtained through high amplified, mixed frequency. After pre-intermediate amplified by V602, it will be sent to acoustic surface-wave Z602 to do IF filter and get better IF characteristics, then it will be sent to N602 (R2S40401) to do intermediate amplification, phase-lock loop VCO and synchronous wave detection to get the composite video signal TV-CVBS; after pre-intermediate amplification IF will also be sent to acoustic surface-wave Z601 to do filter at the same time, the it will be sent to N602 to do intermediate amplification and output the second sound intermediate frequency signal TV-SIF.
The TV-CVBS and TV-SIF signal will be sent to main IC N304 (MST9U89). Video signal of AV1, AV2, S-VIDEO, YPbPr1 and YPbPr2 will also be sent to MST9U89, their audio signal via audio switch N207 (HEF4052BT) selection to MST9U89 (AV1 and S-VIDEO share the same audio jacks).
HDMI1, HDMI2 and HDMI3 via HDMI switch N504 (TMDS351) selection, then sent to MST9U89 together with VGA.
The main IC N304(MST9U89) is a high performance and fully integrated IC, which can realize HDMI interface processing, video decoding, video switch selection, A/D and D/A conversion, interlace/de-interlace processing, modes conversion, OSD and low-voltage differential output, ect.  And it also has functions of audio selection, processing and MCU.
The video signal via MST9U89 processing, output 4 pairs differential signal and 1 pair clock signal for LCD panel display.
The audio signal via MST9U89 processing, it will be sent to N206 (BH3547F) amplifying to earphone. The audio signal will also sent to sound amplifier N203 (TPA3120) amplifying to speaker.

SMPS (POWER BOARD) – 6HU0422010 - Schematic


LG 52LG50FD, 52LG50FD-SA-Service adjustments-service mode entry-white balance adjustment-ADC component 1 RGB adjustment and more

  These adjustments are similar to 42LB7DF Because this is not a hot chassis, it is not necessary to use an isolation transformer. However...