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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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Sony KV32S20
Set is dead, Found Q601 & 602, and H- out, shorted, Res R607 open. Replaced
all and tried to start set with reduced voltage. Got the relays to click about every 2-3 seconds. Came up a little more on the voltage and nothing, Now set will not even attempt to start up, Cant find any shorts. ESR caps in the P/S ok. Not getting B+ to H- out. Dont have a schematic, and my local supply does not have it. Anyone have any tips on what I missed. Or maybe a schematic of the P/S? Thanks Charlie |
#2
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Sony KV32S20
Charlie,check the B+ rail from the power supply.These models sometimes have
protection fuses in line to protect the power supply from s/c hot. Cheers Joe "Charlie East" wrote in message ... Set is dead, Found Q601 & 602, and H- out, shorted, Res R607 open. Replaced all and tried to start set with reduced voltage. Got the relays to click about every 2-3 seconds. Came up a little more on the voltage and nothing, Now set will not even attempt to start up, Cant find any shorts. ESR caps in the P/S ok. Not getting B+ to H- out. Dont have a schematic, and my local supply does not have it. Anyone have any tips on what I missed. Or maybe a schematic of the P/S? Thanks Charlie |
#3
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Sony KV32S20
Did you fix the reason the HOT shorted?
Usually bad solder connections in the h-driver circuit. If not you may have just blown all those parts you already replaced once. David Charlie East wrote in message ... Set is dead, Found Q601 & 602, and H- out, shorted, Res R607 open. Replaced all and tried to start set with reduced voltage. Got the relays to click about every 2-3 seconds. Came up a little more on the voltage and nothing, Now set will not even attempt to start up, Cant find any shorts. ESR caps in the P/S ok. Not getting B+ to H- out. Dont have a schematic, and my local supply does not have it. Anyone have any tips on what I missed. Or maybe a schematic of the P/S? Thanks Charlie |
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