Sony KDL 52W3000

[shorteddiode]

The standby light flashes 5 times when the TV is pluged in, and will continue to give the 5 flashes. Pushing the power button the green light comes on for about one minute then the set turns off , I have no sound and no picture or backlights. I checked the voltages and they all are correct except goint to the tcon board. I am supposed to be getting 12 volts to the tcon and when checked with the DVMM it bounced between 4 volts and .3 volts. The tcon connects to the FB1 board. The FB1 board is getting the proper 12 volt input voltage. My question is, The sercive manual says 5 flashes is either a bad tcon or bad screen. If I am not getting the needed 12 volts to the tcon wouldn't I be safe in thainking it is the FB1 board? I think the FB1 is also called the logic board. Every board except the tcon has the proper input voltage. I can provide a link to the service info if needed.
Thanks Everyone

[tom66]

Re: Sony KDL 52W3000

Possibly a shorted T-con - can you check if it gets good 12V with T-con unplugged.

[shorteddiode]

Re: Sony KDL 52W3000

Should have mentioned, I unpluged the tcon from the FB1 board and I am not getting the 12 volts foe the tcon from the FB1 (logig) board. That's why I felt the logic board was at fault.

[tom66]

Re: Sony KDL 52W3000

That would make sense. Does it still only rise to 4V. It may be repairable - do you have schematics of the main board?

[shorteddiode]

Re: Sony KDL 52W3000

Yes go up to 4 volts then drops, then back up to 4 volts then drops. Continues to do that until the TV shuts down. Yes on the schematic

[tom66]

Re: Sony KDL 52W3000

Yes go up to 4 volts then drops, then back up to 4 volts then drops. Continues to do that until the TV shuts down. Yes on the schematic

Can you attach the schematic?

[shorteddiode]

Re: Sony KDL 52W3000

Here ishttp://elektrotanya.com/sony_kdl-52w3000_fix2-

chassis.pdf/download.html the link for the service info

[shorteddiode]

Re: Sony KDL 52W3000

Well I replaced the FB1 board and now it's up and running, and 12 volts to the tcon.

[tom66]

Re: Sony KDL 52W3000

Great. Though sometimes with Sony it seems a board swap is the only way forward.