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TV works fine for about 3 minutes then the picture goes black and the red light on the front of the TV starts blinking. The sound works the entire time. If I shutdown the TV and wait a few minutes and turn it back on, the red light will blink a few times and the picture will come back, but only for a minute or so and it goes back to black. Again the sound will continue to work fine.
Re: TV works fine for about 3 minutes then the picture...
The light is blinking a code. The code will be a series of blinks, a pause and the blinks again. Phone Sony service and give them this code. They will be able to advise you as to the problem.
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the green is the reboot process and is normal. the red light is an error code indicator. count the blinks of the red light...it cant be 30 times (I think) it will blink a sequence, pause, then do it again for a total of three times. count carefully, it gives you three chances to catch the number it is blinking.
I had a similar problem, except I could make the screen and sound come back by banging on the the TV. I opened the TV and poked around on the circuit card and found a loose pin on one of the regulators, labeled C3852. I resoldered the pins and its working fine now.
turn tv on picture comes up 2to3 seconds later tv blacks out then stand by red light flashes 4 times in a row repeatedly..can not turn on or off when stand by light starts flashing but before tv blacks out you can turn tv on and off repeatedly and picture and sound work.You have to unplug power cord for 30 seconds after stand by light comes on to get tv to turn on.
a tv has two components, firstly a power supply produces high voltage to trigger a line transformer, in turn a transformer produces smaller voltages. firstly check if the ht is constantly been produced from a supply, if this is there than go to a line transformer, and check voltages at the output.
This should be a quick fix. Try resoldering the vertical IC. This is a small flat IC attached to a heat sink with about 11 pins. It should be marked LA7837 or something similar. That should resolve the problem.
I have a similar issue. Sometimes the entire screen goes black and sometimes only one-half - either the top or bottom half goes black. The only solution we have found is to gently tap the TV (usually the front side) and the picture will come back for awhile. It almost seems heat related as it only goes out after the first 10 minutes of use. There must be a fix to this.
The most common problem (I have fixed lots) is the Vertical amplifier has developed a loose connection. It probably just needs resoldering. As things expand it makes and looses connection you picture goes in and out. The vertical chip is a large black chip that gets hot, over time it degrades the solder until a connection is damaged. Most newer sets have a protection circuit that senses the lack of height, and shuts down the picture tube to save it. When the picture dropped to a line on older TVs and left that way too long it would burn a line into the face of the picture tube. You then had to have the picture tube replaced along with the vertical amp. it's kinda like a screensaver for your TV.
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