It is important to know just what attemps have been made to repair the receiver. What parts have been replaced, who fixed it (a service center or a freind or yourself)? If it has a bad channel and if just one bad part was missed and not replaced, you can burn up all the parts that have just been replaced.
When a receiver shuts off seconds after turing it on, this is known as the protect mode. Most of the time is has a shorted output channel causing this. Sometimes it can be caused by a transistor in the protect circuit shorting out when the channel that is shorted goes bad. Even after repairing the bad channel, it will still go into protect if the protect transistor is bad and has not been replaced. Many times a bad channel can still have some components in it that are bad after it appears to have been repaired. This is were experience working with these type of circuits comes in handy.
Let me know exactly what has been done with full details and I may be able to help you locate the current problem.
Dave
O.K. I thought that your comment about "despite many attempts at fixes." meant that it had been worked on or repaired a few times.
It has an electrical problem inside the unit, if you have a multimeter and soldering iron, solder, solder wick, I can help you thru figuring out what needs to be replaced. It is probably a better idea to just take it in to be repaired, but since you are looking for some way to fix it yourself here, I am willing to guide you thru it.
Let me know how you want to proceed.
Dave
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Dave,
It was given to me by a friend, who never had any problems with it. It worked fine for me until now. It has never been repaired or had any parts replaced.
Thanks, Tom
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