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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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Zenith Television
I have a Zenith PVY4665DT Television that I am trying to fix. The tv has no
video or sound. I am unable to get a schematic or service manual. The TV has been sitting up for about a year. I tried to remove the main module but the flyback wire is in the way. I am leery about removing the wire because of the voltage stored in the flyback. If the TV has been sitting up for that long, is the voltage slowly leaking out or is it stored in the transformer? |
#2
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Any charge has long since been disappeared, just take the HV lead our of the
splitter. "Chris Dawley" wrote in message . .. I have a Zenith PVY4665DT Television that I am trying to fix. The tv has no video or sound. I am unable to get a schematic or service manual. The TV has been sitting up for about a year. I tried to remove the main module but the flyback wire is in the way. I am leery about removing the wire because of the voltage stored in the flyback. If the TV has been sitting up for that long, is the voltage slowly leaking out or is it stored in the transformer? |
#3
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Had a chance this weekend to take the wire out and check out the main board.
Checked for cold soldier joints but didn't find any. Checked diodes but couldn't find any bad ones as well. What else could it be? The set has no video or sound. Any information would be helpful. "Art" wrote in message ... Any charge has long since been disappeared, just take the HV lead our of the splitter. "Chris Dawley" wrote in message . .. I have a Zenith PVY4665DT Television that I am trying to fix. The tv has no video or sound. I am unable to get a schematic or service manual. The TV has been sitting up for about a year. I tried to remove the main module but the flyback wire is in the way. I am leery about removing the wire because of the voltage stored in the flyback. If the TV has been sitting up for that long, is the voltage slowly leaking out or is it stored in the transformer? |
#4
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Common failure was one of the main supply diodes in the SMPS, usually the
area of the pcb around the diode will be discoloured and the solder connections appear burnt or charred. This will include other components associated with that particular circuit. "Chris Dawley" wrote in message . .. Had a chance this weekend to take the wire out and check out the main board. Checked for cold soldier joints but didn't find any. Checked diodes but couldn't find any bad ones as well. What else could it be? The set has no video or sound. Any information would be helpful. "Art" wrote in message ... Any charge has long since been disappeared, just take the HV lead our of the splitter. "Chris Dawley" wrote in message . .. I have a Zenith PVY4665DT Television that I am trying to fix. The tv has no video or sound. I am unable to get a schematic or service manual. The TV has been sitting up for about a year. I tried to remove the main module but the flyback wire is in the way. I am leery about removing the wire because of the voltage stored in the flyback. If the TV has been sitting up for that long, is the voltage slowly leaking out or is it stored in the transformer? |
#5
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just out of curiosity, I have some type of glue substance all over my main
board. It looks like a wood glue texture. Is that glue or could it be that leaky picture tube problem? Everything on my board seems to be fine except that I don't have any power to the unit. I can't locate a couple of parts and it would be easier with a schematic but I am unable to locate one. The part I am having trouble finding is IC3415. The CRX3412, HOT, and flyback all seem to be good. I haven't had a chance to hook the unit up to power and test the voltage coming out of the unit. Is it necessary to hook the unit to voltage and test the diode and HOT? Thanks, Chris "Art" wrote in message ... Common failure was one of the main supply diodes in the SMPS, usually the area of the pcb around the diode will be discoloured and the solder connections appear burnt or charred. This will include other components associated with that particular circuit. "Chris Dawley" wrote in message . .. Had a chance this weekend to take the wire out and check out the main board. Checked for cold soldier joints but didn't find any. Checked diodes but couldn't find any bad ones as well. What else could it be? The set has no video or sound. Any information would be helpful. "Art" wrote in message ... Any charge has long since been disappeared, just take the HV lead our of the splitter. "Chris Dawley" wrote in message . .. I have a Zenith PVY4665DT Television that I am trying to fix. The tv has no video or sound. I am unable to get a schematic or service manual. The TV has been sitting up for about a year. I tried to remove the main module but the flyback wire is in the way. I am leery about removing the wire because of the voltage stored in the flyback. If the TV has been sitting up for that long, is the voltage slowly leaking out or is it stored in the transformer? |
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