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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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CTC187 dead
I got this set, friend wants it fixed.
He said the power button is messed up, and it doesnt turn on. well, I seen that it was a ctc187, I know thats not the case. I got the set, and pressed the button, it presses fine. I immidiately thought in my head, since I worked on these before, the 10uf cap in the SMPS primary is gone, fuse is gone, and STK is wasted. thats what I first thought. I took it apart, only to confirm my suspician, the fuse is wasted. I pulled it out, here is the rundown so far: caps look normal, no bloated or exploaded caps like on most of the ones I worked on. The fuse is gone, the HOT is shorted, and 1 of the 2 secondary diodes is shorted. The one that feeds the flyback and associated circuits is shorted. Ok, question. What caused the HOT to blow in the first place? flyback possibly bad? I got another board identical to it, that had a bad STK, and all the power supply caps. Everything was recapped, but the woman said she tossed it, and didnt want it fixed, so I never got the STK, and ended up robbing the caps and the NTSC processor for another set. The HOT and associated circuits are still OK. I wonder if I should just pull the flyback and HOT, with the diodes, and some blue pincussion caps and change them out? any thoughts would be appriciated. ---- Mike |
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