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Question about Proscan PS36800HR 36" TV

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TV won't stay on, cycles off and on continuously

After a power failure, possibly accompanied by a surge, the television will come on, but turns off, then back on, repeatedly. Occasionally it will stay on long enough to display a raster about 1/2" wide. It does this when any of the video inputs (component, vid1, vid2, etc) are chosen except the two VGAs. Then it remains on and displays "vga1" or "vga2" with a seemingly full horizontal scan. I've let it sit overnight, disconnected it from the surge protector, and tried different outlets. Any thoughts would be appreciated.

Posted by Mike Thurman on

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Anonymous

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You say that you disconnected your unit from the surge protector overnight. I assume it was hooked to the surge protector when the problem occurred? If so and based on the fact that you indicate that it is working on VGA1 or VGA 2 I would try replacing the eeprom. It would seem the most likely component and is certainly an easy and cheap solution to try. As techman said these sets are dangerous and you should not attempt this unless you are experienced with the proper procedures. Good luck.

Posted on Jun 23, 2006

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Anonymous

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This coulkd be what we techs call a dog set to repair , as a surge can cause all sorts of problems. If your not a tech theres not just one part we can tell you could be bad but you also need to know how to test oit as these sets have no real user serviceable parts inside these sets. Also dont forget about the HI voltage these sets can store inside for a long period of time , even when they are unplugged. First thing that should be checked inside this set would be the main power supply. The fact that its trying to come on tells you i-ts probably not regulating or a short is preventing it to start up. Check all the error amp transistors as well as the referance IC. If you can get the power supply to come up with a variac. then check the verticle Output ic and see if you disconnect that if the su pply and the set starts up. If not then its most likely a problem in the HI vfoltage/sweep circuit and .or the scan power supply. This could be an easy repair but most times not. Good Luck

Posted on Jun 23, 2006

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If the issue is still unresolved after following all of the troubleshooting steps, Service will be required. Please note the number of times the STANDBY light flashes and relay that information to the service center.
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  2. Unplug the television power cord from the electrical outlet.
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  5. Turn on the television.

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