OK, our SONY 61" KP-61XBR38 TV started making a noise that sounded like arching and the picture would fluctuate along with the noise until the picture shut off and sound stayed on.. I never remembered what code it would flash while this happened because at the time i didn't know much about TV repair.. Now about one month later I would say I know alot more and should have remembered this, anyways I had a TV repair man come out, he ran a Bunch of visual tests and said he was
certain
my problem was on the power board (N board I think) and it would be about $200-500 to go from there.. its an old TV but we love it and i don't have the money to send on such a old TV so I said no. I decided to pull the board out( i have some PC repair experience) and when i fliped the n board over i found that there was one solder that was bad right under the black guy that looks kinda like a coil on a car or motorcycle, I'm not sure if this is the flyback transformer of the box next to it is, anyways here is a photo:
I re-soldered this and put it back in and it fired up, no problem noise, and it worked like a charm..(or so I thought).. I started to notice after watching the TV night after night, that after turned on for about 20-30 minutes the picture started fluctuating and flickering similar to the way it did before, it does it for about 10-20 min and stops.. (almost like something needs to warm up and after it does its fine) It also comes back hours later then stops.. it is very annoying especially when the TV works great other than this.. It has very low hours on it, every the repair man said it looked young inside..
SO, now I'm thinking one of the two components are bad, the flyback transformer or the distribution block.. OR one of the tiny resistors that were on the other side of where I soldered here:
my first guess would be to replace the distribution block because I didn't notice soot (as pictured below) under the block but it looks and smells fine.. the soot might be from the bad solder arching.. this part is also designed to be replaced easy so its a sign this part might need replacement more often.
Id rather replace this than the flyback, its alot of hard soldering to replace that so id guess id try the dist. block first.. OR SHOULD I?? Anyone else have any input on this? I was hoping to get some opinions or maybe someone has dealt with this before and know exactly whats going on.. anything would help..
[ This message was edited by: asmbandits on 2008-10-27 23:24 ]
[ This message was edited by: asmbandits on 2008-10-27 23:29 ]
[ This message was edited by: asmbandits on 2008-10-28 00:07 ]
[ This message was edited by: asmbandits on 2008-10-28 00:08 ]
im not looking for a deffinate answer from anyone just an opinion, i have the probelm 80% solved i just need some opinions on this.. I know this problem isnt just with this model, its high voltage and the parts im talking about or on most tv's like this.. I thought id get a few different opinions, I didnt expect 2 views lol
It won't cost anything but the price of a magnifying loupe and some time to check ALL the boards for bad solder.
Make a note of part numbers you find bad solder on, some like to replace them
rather than just resolder.
While the chassis boards are out you can look for signs of coolant leaks on them, directly below the crt rack.
The Crt boards need to be wiggled loose and checked out too.
You need some serious test equipment and experience to check the flyback and hv splitter, which are not expensive to replace, but it could also be a bad crt.