Sony 50" tv keeps rebooting.

[tri again]

Geek of the week? Heck im always that!! And yeah the LCD tv's show up free all the time, and if you got a little time on your hands there is good money to make off them. I generally pick up dead units off craigslist for nothing or a few bucks, put $20-$30 worth of parts into them and sell for a couple hundred depending on size and age.

In your last post the second picture of the board with the blue transformers is the power supply board. The other two boards are the inverter boards, and the blue board with all the connections is of course the mainboard. The two large fat caps are the primary side and they rarely fail, but suspect all the small brown caps on that board as they are likely Elite brand capacitors. Sony and RCA had a HUGE problem with their manufacturing using Elite branded caps. Very cheaply made chinese caps that fail after a year or two tops. The primary caps you will notice are Rubycon, they spent the big bucks there and then cheaped out on the secondary side with the Elite caps.

Look for any caps that bulging on the tops, sometimes they bulge on the bottom too if they were not tightly installed against the board, the pressure goes out one end or the other. Also sometimes you will not even be able to visually see anything wrong, but they are still bad. On that power supply board did they silkscreen the voltages or anything on there? The two multi conductor plugs at the bottom right of that picture is where you should see all the voltages, 5v, 12v, 15v, 24v to the backlight inverter, the voltages vary by model but generally you have 5v, 12v, 24v. Check them with a voltmeter, put the meter on the line turn the tv on, watch that voltage, you will probably notice one of the rails are kinda low, usually on Sony and RCA tv's the 5v supply fails under load and the voltage drops too low which makes the logic on the mainboard reboot the tv in an attempt to clear the problem itself.

I can tell you one thing for sure, its the power supply board or the mainboard... LOL I know it doesn't help right? Lots of troubleshooting, i generally start with the power supply and check voltages and go from there.

All makes perfect sense and I really appreciate your help.

The boards don't have values near the components, sadly and I'd bet the schematics are impossible to find.
One smoky resistor says r6313 on the board under it and one of the caps says c 6338 so seems like simple location numbers.
My only hope at this moment is to read the values on each component, if possible.

...or just risk some $ and start with a replacement power supply board and take it from there.

It's been a while since my silicon valley days but I still have all the cool tools.

It's just my eyesight and patience ain't what they used to be.
In the past, I'd work to fix something even if someone gave me a new one for free.
I refused to be outsmarted by silly designs.

Weather's pretty harsh these days so good to have some indoor challenges.

Reeeealy appreciate your help.
About the only 2 prices that are fun to watch (come down) are lumber and electronics.

[kb0nly]

Thats typical Sony for you, they never make anything easy. If you google the model number and the word schematic or service manual you might get lucky out on the web. I have found a few service manuals and schematics in pdf format for some of the tv's i have fixed.

I have too many indoor projects right now, the basement workshop is overflowing! LOL

[tri again]

Tyler , MN?

We havethe weather channel here and think about youse guys often.
PNW weather is never as bad as they say.

Oh, Duuude,

I did trip on a website that said with 10 blinks and a reboot, check component #
(hang on, I worte it down, fingers are numb from working outside)

cheks voltages, as you said.
check
10 red blinks error code:

Q 8014
Q 8013 "D" board
R 8051 IC 8005

Looking fwd to getting the reading glasses and some bright light.

I bet the caps crapped out throwing extra voltage to thye resistor that said:

ummmmmph?

..and the IC chip :
Board number:
IC 8005 survived.

Looking like this unit is going to the local library so no real deadline but more incentive to outsmart these engineers.

We Love feathers in our caps, especially for such a worthy cause,

Thanks again

will keep you posted if this is entertainment.

If not, I'll probably post the fix anyway.

[tri again]

to anyone with a bad flat screen tv.

I got through to a place in MN called
shopjimmy.com

FREE tech support and they get Thousands of tv's every week that were broken in shipping. mostly broken screens.

I got a power board for this 3,000$ sony for 40 bucks.

The guy (jimmy) saw some tv's getting literally thrown out and got some for free, sold everything he could get his hands on (ebay) and now has almost 300,000 sq ft, free shipping, guaranteed lowest prices, 180 day warranty.

I LOVE rags to riches stories.