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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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Repair Q on a Sony 27" chassis..
I am working on 2 Sony KV-27TS29 TV chassis, from 1993.
both came in with the typical symtom for these sets; bad regs (C4834) the black VDR, and blown hor output (C4927) too, started by a bad connection. Usually, replacing these parts and soldering does the trick, not with these 2.... Both sets run the Hor out too hard/hot, killing it in no more than 5-10 mins. The picture looks perfectly normal during this short run time. If you go into set-up and turn the width down, there is a slight compression/fold on the right side, I have seen this before in other sets (Mitsubishi) it always means the output runs hot when this is seen. (It's overstressed, not turning off fast enough?) Has anyone seen a fix for this? I suspect hor drive transformer, yoke or flyback, in that order... Also, does the manufacturer of a particular C4927 hor out have better specs than others? I have heard of cheaper rip-offs that just do not work... Should I buy this part from Sony only? Thanks for helping, Aaron H. |
#3
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Repair Q on a Sony 27" chassis..
"Shoreline Electronics" wrote in message . com... If you use a sub par 2SC4927 , this is what happens. That is INSANE! a part of a certain number should be the all the same, regardless of who makes them...why oh why are there sub par parts....they are cheaper, of course... Thanks for the tip-I ordered the "official" Sony version(part of a kit) today-we shall see... Viper If you are a servicer with a resale # , Call Universal Semiconductor for a good quality part. 1-800-222-2321 -- ========================== Jeff Stielau Shoreline Electronics Repair 344 East Main Street Clinton,CT 06413 860-399-1861 860-664-3535 (fax) ======================== "If you push something hard enough it will fall over." Fudd's First Law of Opposition - Sir Sidney Fudd Also Firesign theatre!!! |
#4
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Repair Q on a Sony 27" chassis..
Vector Viper wrote:
If you use a sub par 2SC4927 , this is what happens. That is INSANE! a part of a certain number should be the all the same, regardless of who makes them...why oh why are there sub par parts....they are cheaper, of course... I remember way too many instances where this sort of thing happened. Crown audio amps for one example used to spec _only_ Motorola brand 2N3055 output transistors, anything else would void the warranty! And then there's all those mfrs who specify that their part is a given part number, but "selected"... SELECTED FOR WHAT? Altec was a great one for this, just about every single semiconductor in much of their stuff that I got service info on was labeled like that. Why do they have to design stuff like this? Grrr.... |
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