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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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#1
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(Zenith), Wards, 1989 console model 17750, SVC # PL2511H152 will not power up.
This set has the Zenith split chassis, with a 9-874 and a 9-871 board.
When the power button is pressed the relay clicks and or sometimes chatters a bit, it sounds like the HV tries to come on and then the set seems to shut down. I found cold solder joints on the Hor. output trasistor and also have seen bad relays in these so I pulled the relay, burnished the contacts and put it back but the symptoms are the same. I have no schematic for this set and I was wondering if there are any known common problems wih thesethat afect startup? I don't think this is the series with the bad CRT's that would blow up the regulators. 54something 01, I can't remember. Thanks for any assistance. Lenny Stein, Barlen Electronics. |
#2
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Look for capacitors in the power supply to be bad. Maybe
cx3407,3411,3410? Been too long since I've seen one of these. Is this the power module that has the metal can shield in the power supply? If so one of the capacitors inside the can is also bad. |
#3
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David
I found a 100uf 25V cap near the regulator with an ESR of 29. That seems to have done it. I seem to remember the "cap in a can" bit too but this chassis did not have that arrangement. Picture looks really good on this thing. Wouldn't mind having it in my living room. Thanks a bunch. Lenny |
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