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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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Panasonic CT-36HL43G shuts down.
This Panasonic CT-36HL43G shuts down about two seconds after the 144V supply
relay kicks into the horizontal output circuits. I have the chassis removed from the set (it was too big to carry into the shop). The base drive to the HOT looks good until the 144V energizes. Then a small (extra) oscillation occurs at the base of the HOT on the low side of the input square wave. On the collector side, it is full of extra oscillations. I don't have the deflection yoke plugged and I don't know how much of a difference this would make in terms of fidelity of these waveforms. The last thing that happens before it shuts down is that the AC line current jumps to almost 3 amps. That seems a bit high for this test situation. I've checked all the power supply lines for shorts but have found none. I'm suspecting a faulty flyback but I'd like a second or third opinion. Thanks for your reply. -- David Farber David Farber's Service Center L.A., CA |
#2
Posted to sci.electronics.repair
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Panasonic CT-36HL43G shuts down.
"David Farber" wrote in message ... This Panasonic CT-36HL43G shuts down about two seconds after the 144V supply relay kicks into the horizontal output circuits. I have the chassis removed from the set (it was too big to carry into the shop). The base drive to the HOT looks good until the 144V energizes. Then a small (extra) oscillation occurs at the base of the HOT on the low side of the input square wave. On the collector side, it is full of extra oscillations. I don't have the deflection yoke plugged and I don't know how much of a difference this would make in terms of fidelity of these waveforms. The last thing that happens before it shuts down is that the AC line current jumps to almost 3 amps. That seems a bit high for this test situation. I've checked all the power supply lines for shorts but have found none. I'm suspecting a faulty flyback but I'd like a second or third opinion. Thanks for your reply. -- David Farber David Farber's Service Center L.A., CA I replaced the flyback and that fixed it. -- David Farber David Farber's Service Center L.A., CA |
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