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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 MONITOR GIVING HEADACHE !!!
Hello There,
I have a SONY MONITOR (PVM-20M2MDE) First fuse was blown and chopper(2SD1878) was destroyed. I replaced the chopper and it destroyed again (anything else around was fixed, checked OK). I had to open the chopper and see the horizantal drive signal, it is only 5 KHz which certainly is too low for FBT to tolerate. I replaced the horzantal IC (upc1377c) and the signal is still the same. Here comes the headache ... there are a lot of feedback paths from FBT to this IC, which affect the frequency, I can't connect the chopper (to have feedback)as certainly it destroys again. Has anybody experience with such a problem ? I should add that the destroyed choppers had all pins shorted (this usually means an error in drive circuit). Any help will be appreciated. Dario. |
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