Sony KDL-50W800C

[dprit]

Set came in with Audio but no video/OSD. Backlights are lit. I can't see any video using a flashlight. I read somewhere where a blank screen could be a software upgrade problem but customer did not bring the remote to try a upgrade test. Surface mount fuses on the main board seem ok. Any ideas?

[nomoresonys]

Re: Sony KDL-50W800C

Check for about 12 volts on each side of t-con fuse.

[neilc6]

Re: Sony KDL-50W800C

Check for shorted caps on the panel boards. Probably no tcon on this model.

https://www.badcaps.net/forum/showth...hlight=40w600b

[nomoresonys]

Re: Sony KDL-50W800C

There sure is one on that SO FALSE ASSUMPTIONS ASIDE, dprit is that your tcon board??: https://www.electropartsonline.com/s...oard-unit.html

[nomoresonys]

Re: Sony KDL-50W800C

A WISE man once said "I would rather be last with the CORRECT answer THAN first with the WRONG answer.

[budm]

Re: Sony KDL-50W800C

Upload good clear pictures of the whole backside of the TV so we can see shwoing the boards what we are dealing with.

[dprit]

Re: Sony KDL-50W800C

There is a T-Con board and the 3A fuse is open. I will replace the fuse and see if it blows.And yes nomoresonys that is the correct T-Con board.

[budm]

Re: Sony KDL-50W800C

I would check the resistance of the output side of the fuse with ref to Ground and als check the resistance of all MLC Caps first before putting in new fuse.

[dprit]

Re: Sony KDL-50W800C

I put in a new fuse and disconnected the 2 ribbons going to the signal board/panel. The fuse did not blow but the Sony light at the bottom of the set blinked Red ( It never did that before). Then I took the fuse out and tried it again and as before I had backlights and a normal lit Sony light at the bottom of the set. I'm leaning to something wrong on the T-Con board.

[budm]

Re: Sony KDL-50W800C

I put in a new fuse and disconnected the 2 ribbons going to the signal board/panel. The fuse did not blow but the Sony light at the bottom of the set blinked Red ( It never did that before). Then I took the fuse out and tried it again and as before I had backlights and a normal lit Sony light at the bottom of the set. I'm leaning to something wrong on the T-Con board.

But does it blow the fuse if the ribbon cables between the T-CON and the LCD panel are connected?

[dprit]

Re: Sony KDL-50W800C

Does not blow the fuse with the ribbons hooked up. But with the fuse replaced, I can't power up the set by pushing the power button. Take the fuse out and I can power up. I will try to find a T-Conn board and reply.

[neilc6]

Re: Sony KDL-50W800C

Disconnect one side of the ribbon cables at a time and try powering on. If one side shows a picture, there is a panel fault on the side that doesn't power up.

[dprit]

Re: Sony KDL-50W800C

Unplugging the ribbon cable that goes to the left side of the panel brings up a picture on the right side of the set. I'll check to see if there are any shorted caps on the source board that is loading down the T-Con.

[nomoresonys]

Re: Sony KDL-50W800C

It's a good half picture? what do you get when you do the other side?

[dprit]

Re: Sony KDL-50W800C

Yes it is a good picture on the side that is hooked up and a bright white screen on the side that is not hooked up. And when I switch the ribbons-my set will not power up.

[Aakashlimbu]

Re: Sony KDL-50W800C

Its panel problem .if you open left side ribbon cable and display shows right side then your left side problem..do remove at right side as a same way and watch it.if left side problem then you need to block signal.for more send me a picture of tcon.i will guide you