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. |
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!!! |
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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