Entertainment Center: TVs, Stereos, VCRs and DVDs - Zenith RPTV Blowing fuse
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ratmandu
03-15-08, 04:42 AM
I recently got a Zenith A50M84W Rear projection TV for free. I'm trying to fix it up for the local police station breakroom, to replace the 20 incher that is going green ( not sure on its problem... ) but this tv keeps blowing the 4 amp main fuse. It will blow the fuse when completely disconnected and out of the set, so it isnt the degauss posistor. Any ideas on other problems this might have? I have checked the solder side and resoldered a few sketchy joints, but none were really bad, and I don't see any solder bridges either.
Rick Johnston
03-16-08, 04:44 AM
It will blow the fuse when completely disconnected and out of the set
When what is out of the set?
Something is causing a direct short. Could be any of a hundred things. Check the component side with a magnifying glass for burned parts. (Or the solder side for overheating.)
When what is out of the set?
Something is causing a direct short. Could be any of a hundred things. Check the component side with a magnifying glass for burned parts. (Or the solder side for overheating.)
ratmandu
03-16-08, 05:15 AM
When what is out of the set?
When the power board is out of the set, disconnected from the tubes, and the small signal board. I have checked the board several times over, cannot seem to find any burned/damaged components. I have also checked the resistance between the 2 ac input legs and it shows to be about 5 MegaOhms. Ill go ahead and take another good look at it, but come monday If I still cannot figure it out, im gona make another call to the LG/Zenith parts department and see about a replacement board.
By the way, If anyone needs a service manual for a Zenith or LG product, give their parts department a call... If they have it, they will email it to you for free in PDF form. Unfortunately, they had everything but the schematics for this model :(
When the power board is out of the set, disconnected from the tubes, and the small signal board. I have checked the board several times over, cannot seem to find any burned/damaged components. I have also checked the resistance between the 2 ac input legs and it shows to be about 5 MegaOhms. Ill go ahead and take another good look at it, but come monday If I still cannot figure it out, im gona make another call to the LG/Zenith parts department and see about a replacement board.
By the way, If anyone needs a service manual for a Zenith or LG product, give their parts department a call... If they have it, they will email it to you for free in PDF form. Unfortunately, they had everything but the schematics for this model :(