Sony TV KDL-40EX43B

[NoFixIT88]

Hi All

I have a 40" Sony Bravia TV & Blueray KDL-40EX43B. During its life it didn't really get used much (max twice a week) so it was a bit of a surprise when one day it didn't turn on.

The story so far, at first a DVD got stuck in the drive and every time I tired to turn the TV on the green light came on but no picture or sound, not even a boot logo or backlight. After turning it on and off a number of times I managed to get the DVD to eject and the screen turned on. Then after that time it has never booted again.

So after checking the voltages on the power board I tried jumping the STBY3.3V pin with the POWER ON pin on the CN6401 connector and the backlight turned on. So I thought it was the main AV board (BU board I think its known as) so I changed it and now I am getting 3 flashes on the red power light. I have tried disconnected everything and plugging in things one by one but nothing helps.

I have attached a word document with all the voltage readings from the power board.

Any help would be greatly appreciated

Thanks, George.

[NoFixIT88]

Re: Sony TV KDL-40EX43B

If I disconnect connector CN2561 on the main board as shown in the picture attached and jump the 3.3STBY pin to POWER ON all the voltages on the power board are correct and the backlight turns on. As soon as I plug CN2561 back in the backlights turn off.