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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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Philips 3A chasis again.
First thanks to those who answered last time!
I have now working tuner. Many setting made in service menu where gone. Now I have ordered new EEPROM and zeners. But another problem came up. Picture is fine, but contrast or brightness bumps. Is it voltage problem or IC or capasitor prob? Where should I start looking for it? |
#2
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Philips 3A chasis again.
timppa:
I am not really certain what you mean when you say that the "contrast or brightness bumps" ....... Guessing that you mean that the levels change, maybe with bight scene changes, the first things I would check would be the B+ voltage regulation..... also ESR check all of the electrolytics in the power supply, flyback derived B+ sources, and the screen regulation circuitry. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "timppa" wrote in message But another problem came up. Picture is fine, but contrast or brightness bumps. Is it voltage problem or IC or capasitor prob? Where should I start looking for it? |
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