When I switch the set on, the sound comes on immediately, but the picture takes a few minutes to appear. The colours and definition aren't good. The standby light flashes 5 times, stops, and this sequence continuously repeats. I believe this may be a common fault, but the manual doesn't give any specific information. Any ideas? Is it worth having it repaired?
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Re: Sony Trintron KV-32FX20U
This is a problem with the "AKB" circuit. There is a problem with the video signal. Are you comfortable changing parts inside the set? If so, please update this. I'll look up the specific parts for this model and post them.
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Check its video output card [a card directly plugged on to the back of the picture tube] for any loose solder terminals. Re-solder all the suspected solder terminals there, by applying a little more solder to each points. A bad solder point can cause this type of problem.
Since the set recovers under some conditions, I would first look for poor solder connections. With a set of your vintage, it is common for some of the connections to become faulty. If you can solder, resolder any connections on the board that appear grainy or have rings. Please note that there are potentially dangerous high voltages present inside the set even when unplugged.
All Sony sets will stay blank until the circuit is ready to power the tube. If there is a problem detected inside the set, the tube will remain vlack and the standby light will blink. This blinking will repeat a count as follows: Blink count, pause for a second or two, repeat the blink count, etc. Some Sony sets will play for a while then flash off and on. This is usually an indication that the picture tube is starting to fail. In your case, you should see a blink code. If you can update this with the blink count, I can use that info plus the model number listed above to provide a possible cause and the parts required to repair the set.
The problem here is with the vertical circuit. Most likely hte vertical IC is bad. Look for a small flat IC attached to a heat sink. It should have about 9 pins or so and be marked LA7837 or something similar. If you can solder, try resoldering the pins first. If that fails to resolve the problem, replace the IC. If you regain a picture but it appears distorted in some way, additional parts will be required. Update this with your results and we'll proceed from there.
Takes about 5 minutes for picture to appear... Then every one to two minutes the picture disappears. It comes back on for 1 - 2 minutes then repeats. When set if first turned on, the stereo/stand-by light (red) flashes on/off until just before picture first appears
.if your tv is very old than it might be due to crt getting weak
crt base loose
loose contact in power supply