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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Sound but no picture, picture returns after switch off/on.
Hi,
Akai 28in Wide Screen. After a few minutes the picture goes black, I have sound but no picture. Switching it off then on again fixes it for a little while then the picture goes off again. Could last hours or go off in 2 minutes. Any ideas? Alan |
#2
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Sound but no picture, picture returns after switch off/on.
It can be a temperature related problem, where a component is working
on the edge of spec. When powering the set down, and up again, the specs are changing enough to allow the set to start. To resolve this, proper troubleshooting of the power supply, scan circuits, and related areas would have to be done. This is something you would not be able to do at home, unless you have experience in TV servicing, and are set up to do this type of job. Jerry G. ====== |
#3
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Sound but no picture, picture returns after switch off/on.
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#4
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Sound but no picture, picture returns after switch off/on. Update
Thanks for your replies.
I originally thought that the problem was of the usual dry solder joint type but now I'm not so sure. Switching the TV off and on using the standby buttontakes less than a quarter of a second and it always fixes the picture if only for a little while. I wouldn't expect this if it was a problem with heat expansion of a circuit board. Also the room temperature doesn't seem to make any difference. The connector at the neck of the tube still glows when the tube has gone off. I don't know too much about electronics, I'm a former electrician so I have a grasp of the basics but could it be something to do with a part of a circuit discharging when the picture is switched off? Or voltage regulation perhaps? I told you I don't know too much electronics! I had hoped that the fault would be of a type that someone would recognise as a particular one. Otherwise I will have to take Jerry G's advice and take it to a repairer. |
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