Question about Sony KV-32S25 32" TV
A while back my Sony KV-32S25 stopped powering on. Through some "accidental" testing I figured out I could unplug it for about 5-10 minutes, then plug it back in...and it will then work fine. Until I shut it off!!!
Then I have to go through the same process again. I also noticed if I leave it unplugged for too long, my little "trick" won't work. If the unplug time is too shot or too long it won't power on. About 5-15 minutes seems to be the range.
Its more likely to be bad capacitors on the power board but you will need to see first, it could also need reflowing on the main av board there is a large chip on there that some times can cause this problem when it starts to come lose from the board ( hot then cold temps) there are plenty of home remedies to do this, essayist is a halogen light and make something to support it around 1 to 2 cms above the chip making sure the board is flat, leave the power on the light for an hour or 2 then let it cool down. other way is with a heat gun but you need to be careful as the plastics can melt doing it this way you need to cover them so they don't get hot.,, but check capacitors and voltage first.
Posted on May 25, 2017
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Posted on Jan 02, 2017
SOURCE: Sony KV-32S40
When the horizontal output (2SC4927) is shorted it means one of 2 things is wrong - the horizontal drive transformer has cracked solder joints or the flyback transformer is shorted inside. If the solder joints on the horizontal drive transformer (the small grey transformer connected to the base of the horizontal output transistor) are cracked then the set will play for a little while and then the parts you just replaced will again be destroyed. ALWAYS resolder the driver transformer when replacing the parts you mentioned! When I replace the parts you mention and I do not see any obvious cracks on the driver transformer then I unsolder the B+ pin of the flyback (labeled 135, for 135 volts) and put a 60 to 100 watt lightbulb (drop-light) in series with the flyback. This means that the 135 volts B+ goes through the lightbulb and then into the flyback, so the lightbulb acts as a current limiter to protect the horizontal output. When you turn the set on the bulb should glow no more than about half bright and you should hear the high voltage come up, but you should not see a picture. If you turn the set on and the bulb glows as bright as if it was plugged into the wall then you can bet that flyback is shorted and must be replaced.
Posted on Jul 13, 2007
SOURCE: Sony KV-32S25 32"
Check Horiz. output transistor = shorted?
1)replace with first quality transistor
2)solder horiz driver circuitry
3)replace shorted converter transistors (2SC4834)
4)Replace open R607 .1 ohm 1/2 w.fusible (resistor ok)
Posted on Oct 26, 2007
Changing this requires a change of the tuner. There is nothing inside the set that can make this change. There are external systems that can do this, but they are expensive (multiple $100s).
Bottom line is that this would require a change in the internals of the set.
Posted on Mar 16, 2009
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