Repairing A DEVANT LCD TV Auto Shut Off Problem




Trouble :

If you turned on the main switch, the red pilot light will light up and then the blue light but then shut off. All the power supply in the output of the chopper transformer are all gone after it shut off. THis kind of trouble is commonly caused by the electrolytic capacitors in the power section.


A leaky Electrolytic Capacitor with a part number of C849 with a value of 2200uf/16volts


Here is the location of the Leaky Capacitor

Location Of The Leaky Capacitor

Replacing The Leaky Capacitor

power section


Repairing A34JXV70X NEC TV With Picture Problem

I got this post from a Gsmsandwich forum posted by jesse_25 so all credits goes to him I’m just sharing it here in the site for reference if ever we encounter this kind of problem.

History of the unit :

The owner of the tried to clean his unit but after the cleaning, when he turned on the unit, the problem arouse.






So the owner brought the unit to jesse_25 for repair and what he saw when he open the unit was the switch that is located on the CRT Board is switched to the center.

Switch in the CRT Board

When he switched it back to the left side.

Switch to left side CRT Board


Then after that, the unit is restored backed to its original condition :)

A34jxv70x nec

Repairing A DVD Player (No Display, Lights Only, No Buttons Functions)

Repairing A DVD Player With Corrupted Firmware (No Display Lights Only, No Buttons Functions)

Let me share to you this tutorial about repairing DVD player caused by corrupted firmware. Thanks to Ikasamoko of ELAB forum for sharing his knowledge on this topic.
The DVD is on Half-Dead state, which means the power supply is OK all over the entire circuits, but no Display, Lights Only and No Response on Buttons or Remote Controller.



Main Cause of the Problem :
Most probably caused by Corrupted Firmware of the SPI EEPROM which is mostly EN25T80 chip.


Why do the Firmware or Program become corrupted? One of the main reason is STATIC and the another one is due to poor power supply design or decoupling which reached by the spike and noise directly to the EEPROM.


These are the tools needed to revive the Firmware :

1. USB SPI Programmer
2. USB_SPI_Flasher_by_RBT
3. STK Sunplus Tool Kit 0.2.3 (rev 8203R)



1. READ a FULL BACKUP of the firmware of the DVD using your USB SPI Programmer.
2. Open the firmware with STK Sunplus Tool and this is what you will see:

STK Sunplus Tool


Those 2 RED boxes indicates that your CRC or FILE CHECKSUM is damaged and thats the reason why it won’t work.


3. To correct the checksum simply save the firmware and theĀ  STK Sunplus Tool will correct the firmware automatically..SEE IMAGE

STK Sunplus Tool


4. After saving, WRITE the firmware again to the EN25T80 using the USB SPI Programmer.

5. Test the unit