View Full Version : Found a 32 inch Sony KV-32FS12. Picture comes and goes, and snapping sounds.


MRX37
11-06-2008, 01:33 AM
Yep. I found a ridiculously heavy Sony Trinitron. I was excited as this is a flat screen TV, and flat screens are still worth something.

Upon getting it home and carrying it in... damn thing weighs 165 pounds, I spliced on a power cord and plugged it in. To my amazement the TV turned on. On just a static channel, the picture would be black one moment, then show static the next. This alternated every second or so.

Upon hooking up an antenna, I got a picture, then I started hearing these snapping sounds. When the snapping sounds started, the picture went crazy. I yanked the plug out of the outlet. I didn't smell or see anything burning.

Is this a simple fix like a bad cap, or does this TV need some special part?

PS: Did I mention that the f***er's HEAVY!!

freakaftr8
11-06-2008, 02:33 AM
First of all I own a 36 FS trinitron. Yes these are known to have issues of all types. I have had to repair the power supply 5 times now over the course of 2001 to now. Ok the snapping sounds you are hearing, take the back off turn off the lights, look at the flyback watch for a light show. Also was it damp when you got the set? I would resolder the flyback connections on the PCB, I have seen cold solder problems. Try to start there..

MRX37
11-06-2008, 12:30 PM
First of all I own a 36 FS trinitron. Yes these are known to have issues of all types. I have had to repair the power supply 5 times now over the course of 2001 to now. Ok the snapping sounds you are hearing, take the back off turn off the lights, look at the flyback watch for a light show. Also was it damp when you got the set? I would resolder the flyback connections on the PCB, I have seen cold solder problems. Try to start there..

Ehh it was a bit damp where I found it, but the inside was nice and dry, plus I let it sit in the house for a bit before I messed with it.

I ***DON'T*** want to run it any more until I can be fairly certain it won't start doing that shit again.

MRX37
11-06-2008, 04:17 PM
Apart from resoldering the flyback connections, what else can I try to fix this?

freakaftr8
11-06-2008, 05:14 PM
When it snapped and the CRT went blank, was the standby light flashing before the raster came back?

MRX37
11-06-2008, 05:22 PM
The CRT didn't go blank during the snapping sounds. The picture went crazy. I don't know what the standby light was doing, as the second it started, I pulled the plug.

freakaftr8
11-06-2008, 07:00 PM
Snapping sounds usually are associated with HV. Either there is a crack in the flyback casing, bad connections in the flyback, bad connection between the black wire coming off the crt degausing field going to the crt neck board, bad connection on the HOT, bad HOT, or alot of dust and debris shorting something out, and of course something wet. Start there, and you could try pulling the CRT neck board, the standby light will keep flashing, but there could be a short in the crt.. I know alot of this sounds far fetched, but the B+ will shutdown sending it to standby, thats why the pic was going out and coming back on. These sets seem to be hard on the HOT although. I would turn the board over and start checking solder connections.

avionic
11-06-2008, 07:15 PM
These units are also notorious for cracked printed circuit boards.The second anode cap could also be loose(large suction cup thing on the top of the picture tube (CRT)).Sony also uses a focus rectifier block that breaks down and does a lot of arcing (snapping) This looks like a plastic rectangular block with heavy duty red wires coming out of it.One of the heavy leads goes to the second anode.

MRX37
11-06-2008, 08:13 PM
Okay. I'm going to touch up the solder connections to the flyback, inspect the anode cap on the CRT, and I'll look at that focus block.

If I plug this thing back in, I'll keep the lights low and look for a "lightshow". Is there any danger in plugging it back in? Could the damn thing catch on fire?

avionic
11-06-2008, 08:20 PM
Could the damn thing catch on fire?
Anything is possible..If it does you probably should unplug it..:D
Beware potentially lethal high voltage. Even with the set unplugged the picture tube with store a very healthy high voltage charge.(knock you on yer arse):yes:

MRX37
11-06-2008, 09:12 PM
Anything is possible..If it does you probably should unplug it..:D


Okay... That's tilting me more towards pitching the damn thing...

MRX37
11-06-2008, 09:39 PM
ohhh kay... I'm throwing out this TV. Flyback connections looked fine, that focus block looked fine, anode cap looked fine. Plugged it in, and started smelling smoke. So it's bye bye TV. I don't care if it's a flatscreen. I don't want to chance selling it to someone only to have it burn their house down.

radiotvnut
11-06-2008, 09:42 PM
I'll bet that smoke was coming from the flyback. The flybacks (and the CRT's) are not known for reliability in those sets. You'd think they would be better, given what those TV's cost.

MRX37
11-06-2008, 11:15 PM
Yeah you'd think. Oh well, the TV's now sitting by a dumpster.

zenithfan1
11-06-2008, 11:24 PM
The picture came, it went and now it's gone.

freakaftr8
11-07-2008, 12:00 AM
Sorry to hear that set didn't work out for you, sony's dont seem to have the reliability record they once had. Too many PS and flyback issues with these sets.. As a matter of fact, maintaining my 36XBR450 is about as much a pain in the rear as msintaining electical gremlins in late model VW's...

zenith2134
11-07-2008, 12:03 AM
Was entirely unsatisfied with my '04 Wega. Bad CRT and IK shutdown.

Have a 99 KV35S40 that still looks great after tons of use and not one repair.

It will inevitably develop PS issues though, since these late 90s ones all seem to.

MRX37
11-07-2008, 12:22 AM
Its weight was going against it too. The smoke was the final nail in the coffin. Thank the lord I have a truck! Trying to lift that monster out of a car would have probably thrown my back out.

zenith2134
11-07-2008, 12:27 AM
Sony's were always heavier than the others. On the late model sets, it certainly ain't the paper-thin cabinets making em heavy. So, what exactly is it? Is it the trinitron aperture shadow mask? CRTs are inherently heavy items but Sony's are always weighty. But think about it: No transformers adding lots of weight (even with them the chassis don't weigh much at all)

freakaftr8
11-07-2008, 12:01 PM
And sony's have like 3/4" glass on the crt face too!