My old set, while still in great condition, has a few problems that have developed in the last few years.
1. The main problem, is that most times the tv gets turned on (receiving via antenna on coax) the picture will break up, with white lines flashing across the screen and static bursting simultaneously from the speakers (see it on youtube: http://www.youtube.com/watch?v=M7P6SLoVM6A ). This only occurs when using the tuner, and stops after the set has been on for 10-15 minutes.
2. The composite video input is flaky, while it's in use I'll frequently have to get up and use the input cable as leverage to "bend" the jack either up or down until it comes back. While it seems likely that this is a bad ground or broken solder point, I'm fairly certain that at one point I had resoldered everything and it didn't make a difference, so any other ideas would be helpful. Does anyone know if it's possible to add an s-video input? The next model year's set has one, but this one does not.
3. Power switch is faulty - I hear this is a common problem, does the switch need replacing, or can it be repaired?
4. Sound seems "quiet/hollow". The volume needs to be set much higher to be audible than when it was purchased, and it sounds a little tinny. But speakers themselves seem fine, could this be a dying amplifier or something?
If anyone has any suggestions for any of these issues please let me know, I'd like to fix it myself if it's not going to cost much for parts. Thanks!
Re: picture intermittently drops out.. other problems
Tv pricing has come down quit a bit these days and like the typical computor printers the ink cost more. In your case the parts will cost you a lot. With all the problems discribed "buy New" and get yourself up to date with that of what you want a Tv to do for you.
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try and use an old vcr and just keep it turned on and plugged into that input, maybe thatll do it, sounds like a loose solder joint, possibly may have got dropped at one time or another. Also maybe try to GENTLY push in/down on jacks that whole input square area while somebody watches to see if goes away. If it does then needs to be resoldered.
hpesoj the problem comes from the satellite in the sky, too many bits of data for your chassis, only fix involves adding a capacitor to the microprocessor, note that if the modification is done your closed captioning will no longer work, but it`s the only thing that will stop it other than un-plugging the ac cord waiting for a short time and then re-apply the cord, which you have already found out, any local tv tech should be aware of this "so called fix" give them a call, good luck, BMW Rider
I can think of a few conditions that would fit that symptom, my guess would be problems in the vertical circuit which are somewhat common in that unit model.
First I would test R561 0.47 Ohm for an open condition and test and/or replace IC541 with a TDA8172. IC541 is your vertical output.
Another suspect would be vertical yoke windings. Maybe not short at the moment but could be shorting intermittently. You would have to have the windings ring tested to prove the theory.
And lastly - depending on the distoritions I'd ring test the flyback transformer for intermittent short, sony p/n#1-453-268-11 and test the B+ (high voltage) as it comes up and at the point of failure. Any surging would be dispositive of a voltage regulation failure.
Nine years is a good long time but there is no reason that this unit can't operate another 5-6 years. The repair diesn't sound too serious or extremely expensive for a reputable shop.
If you need any help locating one you might try the NESDA web site: http://www.nesda.com/locator/state_search.php
and I would take the unit to the shop rather than have them come and pick it up - even though it's so heavy- it will save some money.
Sorry for the bad news, as a certified tech it's the one thing I least enjoy is giving bad news in a solution.
I'm about 90% sure it is the blue picture tube developing an intermittent heater to cathode short. I'm surprised the set isn't shutting down shortly after this happens. A service call will tell you for sure as it could also be a bad solder connection causing a similar symptom. My own procedure to check it out would be to GENTLY tap the neck of the suspected picture tube with a screwdriver handle to see if I could get it to come and go (Or get out my CRT tester and measure it with the power off). Obviously by holding the screwdriver blade you don't want to accidently short anything out as there is about 33,000 volts a few inches away from where I would be tapping. Nuff Said.
What you're describing sounds like a vertical deflection problem if it also occurs when you're watching a TV program. This type of trouble is a component failing in the vertical circuit of your set. A loose solder connection could cause this.
On the other hand, if it just happens when you run the VCR, your problem could be somewhere in the tape drive mechanism or possibly a bad tape. Things like slipping clutches,bad belts sticking guide rollers are a few things that will cause this in a VCR.
You need to have a tech check it for you.
Hope this gives you some help.
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.
the picture tube on your TV set is exausted. Please contact your nearest Authorized Sony Service for further help/advice.
After all, Sony is a good choice. The next TV set you buy could be one of Sony-s Bravia LCD.
It is a 20" TV set and will most likly, im afraid to tell you, cost more to fix then it is worth. The problem is a bad Picture tube, an intermittant CRT socket or the video jungle IC is intermittant. If you want to invest in an estimate, check out first if it will go towards the repair, as then maybe you can get it fixed at a good price, as long as the picture tube is not the problem Good Luck