My Sony KV-32S45 has worked great for years, no problems. Just a few days ago, the picture started disappearing. The TV turns on fine (red light flashes for a few seconds before picture appears), and will work great for about 5 minutes. Then the picture gets compressed to the upper third of the screen, in kind of a trapezoid shape. The picture is full width at the top, and only a few inches less than the screen width at the bottom of the picture. The picture wavers quite a bit during this time. This usually lasts for 2-5 seconds, and then the screen goes blank (no flashing red light though). The sound is working fine the whole time.
I've read through solutions to similar problems, but this one seems unique enough that I'm not sure of the solution. I do have a service manual that I found free on the web, with instructions on how to safely open up the chassis and replace parts. I am also comfortable enough with a voltmeter and soldering iron that I feel I can do some minor repairs. I'm just not sure where to start. Anyone have any ideas? Is this something that can be fixed with adjustments or do I need to order replacement parts?
Also, if this is fixable with replacement parts, can anyone suggest a good place to order from?
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I would look for intermitent solder connections on the small horizonal driver transformer as well as other HV Componets.(HV Transformer etc.) Also solder up the Vetical output IC. These have been common causes of failures. I would not use the set until these have been checked and soldered. If you don't, a massive failure of the hoizonal circuit and powersupply will occur.
Hope this helps,
sounds like the filament of the picture tube is losing voltage. normally this would be caused by a bad/broken/cracked solder connection. If this is the problem, it may not be too dificult to fix if you have the soldering skills and know what to look for.
Picture int disappears leaving snow on screen
Resolder the Xtal in the tuner
No picture - screen is empty. Sound is ok
Check IC101 (BA7630F), if video signal comes to input (pin 1) but not present at output (pin 14) then replace this IC
Intermittent video or snow
Resolder points A, B, C, D in tuner PCB, check cold solder on tuner shield 2-106-349-21
probably the tv has a loose solder in the board. this is normal especially when tv is aging. most of the components inside are emitting heat resulting to loose the solder. try to inspect and resolder if possible. but if you dont have the proper tools and equipment and you're not inclined with this kind of job, better bring it to a qualified tv technician. good luck!
intermittent problems can usuall be liked to bad solder connections. And sony typically has some that will develop after a few years in the power supply. so check for bad sodler connections throught the main board & give a close look to the power supply & check you work after to make sure you have no shorted pins.