I'm working on a sharp lc-45gd4u LCD TV that after power up, has no video and no sound, but has back lights. It turns off after about 30-45 seconds.
According to the owner, if he turns it on an off a number of times, it will eventually come on. He says the amount of time it takes to come on is getting increasingly longer, and is now over an hour.
I did see the TV on and when it's on, it works fine. It can be turned off and back on within a few minutes, but if it stays off more than about 10 minutes, you have to turn it on and off for another hour to get it back on.
I don't see any leaking caps on the power supply board and all PS voltages seem to be there. The PS_ON is working, since the back lights light up.
The increasing time to come on sounds like a failing cap, but isn't the power up digitally controlled by the main processor?
This is an older TV with a bunch of boards, some of which are very difficult to access/remove.
Anybody have any suggestions?
Thanks!
According to the owner, if he turns it on an off a number of times, it will eventually come on. He says the amount of time it takes to come on is getting increasingly longer, and is now over an hour.
I did see the TV on and when it's on, it works fine. It can be turned off and back on within a few minutes, but if it stays off more than about 10 minutes, you have to turn it on and off for another hour to get it back on.
I don't see any leaking caps on the power supply board and all PS voltages seem to be there. The PS_ON is working, since the back lights light up.
The increasing time to come on sounds like a failing cap, but isn't the power up digitally controlled by the main processor?
This is an older TV with a bunch of boards, some of which are very difficult to access/remove.
Anybody have any suggestions?
Thanks!
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