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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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Replacing line driver power transistor on Sony TV
There's a fault on my Sony telly which I think I've narrowed down to the
line driver stage before the line output transistor. Certainly when I blast this transistor with freeze spray the set recovers, only to throw a wobbly again a few minutes later.(line width starts to become unstable/wavy on right, although all lines start OK on left, before the set closes down with 2 flashes on fault LED). I thought I'd try replacing this transistor, which is a 2SC2688. Does anybody know where I can get such a transistor in the UK, or how I can find an equivalent that will do? Thanks in anticipation, Alan Beamish |
#2
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Replacing line driver power transistor on Sony TV
have you tried tightening the heat-sink screw and touching up the three
solder joints? A lot of these transistors lift their legs off the Pc board after a few hundred heat/cool cycles, or break their pads off the Pc board. Otherwise if it is a flaky transistor, it shouldnt be too critical, it's just a 300V NPN 200Ma transistor. There's three of these on most color TV CRT socket boards, as video drivers. Regards, George .. |
#3
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Replacing line driver power transistor on Sony TV
Check also the small electrolytic capacitor in the same circuit, attached to
one side of the driver transformer, seen many of them cause strange sweep related problems. "Ancient_Hacker" wrote in message oups.com... have you tried tightening the heat-sink screw and touching up the three solder joints? A lot of these transistors lift their legs off the Pc board after a few hundred heat/cool cycles, or break their pads off the Pc board. Otherwise if it is a flaky transistor, it shouldnt be too critical, it's just a 300V NPN 200Ma transistor. There's three of these on most color TV CRT socket boards, as video drivers. Regards, George . |
#4
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Replacing line driver power transistor on Sony TV
Thanks to Art and Ancient Hacker for the advice. I'll check these before
replacing the transistor. Regards, Alan "Art" wrote in message . .. Check also the small electrolytic capacitor in the same circuit, attached to one side of the driver transformer, seen many of them cause strange sweep related problems. "Ancient_Hacker" wrote in message oups.com... have you tried tightening the heat-sink screw and touching up the three solder joints? A lot of these transistors lift their legs off the Pc board after a few hundred heat/cool cycles, or break their pads off the Pc board. Otherwise if it is a flaky transistor, it shouldnt be too critical, it's just a 300V NPN 200Ma transistor. There's three of these on most color TV CRT socket boards, as video drivers. Regards, George . |
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