Sony KDL-46EX710 No Picture, no LED on or blinking

[Lrojas]

Hi Guys,
I have this tv that was hit by a power surge apparently. The front led doesn't light up or blink. The Power supply clicks constantly with power applied. I read a tech manual that someone posted on the forum for this model. It says the power supply needs replacing. The particular power supply isn't as cheap or readily available as the last tv I got working, so was hoping the component level fix would be a bit more affordable and not too difficult to fix.

[Lrojas]

Re: Sony KDL-46EX710 No Picture, no LED on or blinking

here are the voltage readings on the plugs attached. Blanks are no voltage

Tcon12v GND
(No label)
(No label)
Tcon vcc 12v.

TCON ON.
TCON VCC 12V.
DIMMER DC
DIMMER
BL ON
BL ERR 0.52v
REG 12v
REG 12v
REG 12v GND
REG 12v GND
AUDIO 12v GND
AUDIO 12v
POWER ON. blips various low powers throughout clicking
AC OFF DET. 3.35v
STBY3 3v. 3.35v

[budm]

Re: Sony KDL-46EX710 No Picture, no LED on or blinking

TCON ON.
DIMMER DC
DIMMER
BL ON
POWER ON. blips various low powers throughout clicking

The main board is getting the 3.3.V to run but it is not running, it is sending pulsing command signal Power ON (PS-ON) command instead of steady dcv of >2VDC, it is also not sending other commands as well as shown above.
Something is bad on the main board, the LED indicator should at least be on if the main board is alive.
Please up load the pictures of the whole backside of the TV showing all the boards.
Did any other devices that are connected to the TV are damaged too?

[Lrojas]

Re: Sony KDL-46EX710 No Picture, no LED on or blinking

TCON ON.
DIMMER DC
DIMMER
BL ON
POWER ON. blips various low powers throughout clicking

The main board is getting the 3.3.V to run but it is not running, it is sending pulsing command signal Power ON (PS-ON) command instead of steady dcv of >2VDC, it is also not sending other commands as well as shown above.
Something is bad on the main board, the LED indicator should at least be on if the main board is alive.
Please up load the pictures of the whole backside of the TV showing all the boards.
Did any other devices that are connected to the TV are damaged too?

I don't know about other devices, I bought it as part of a two tv package.
Here is the pic you asked about. Can't get more than one pic per reply to load

[Lrojas]

Re: Sony KDL-46EX710 No Picture, no LED on or blinking

Here is just the main board

[Lrojas]

Re: Sony KDL-46EX710 No Picture, no LED on or blinking

This is the reason I thought the power supply board was bad

[Lrojas]

Re: Sony KDL-46EX710 No Picture, no LED on or blinking

Hey BudM,
so what ya think?

[budm]

Re: Sony KDL-46EX710 No Picture, no LED on or blinking

At this point it points to the main board due to lacking the command signals not being sent to the power supply board, especially the pulsing PS-ON signal which should be steady DCV of more than 2 VDC. As to what the exact cause of the failure on the main board is I do not know.

[Lrojas]

Re: Sony KDL-46EX710 No Picture, no LED on or blinking

ok, I'll try to find one. thanks!

[Lrojas]

Re: Sony KDL-46EX710 No Picture, no LED on or blinking

Well I can't find a main board, this might be a lost cause