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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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Panasonic CT-27G10CT Horizontal Output Failure
SYMPTOM: Set is dead, line fuse is open. Further inspection reveals Q551 is
shorted. CAUSE: Horizontal Output Transistor Q551 has failed due to excessive reverse bias across the collector-emitter electrodes. This may have resulted from turn-on and turn-off transients, hydro line transients or the like. REMEDY: Replace Q551 with the improved type (available in kit form). With most models, it will be necessary to change resistors R510 and R511 as well, to reset the H drive T501 primary saturation current. Please refer to the following listing for kit application and ordering details. NOTE: The new type transistor is larger. Use caution when forming the leads to fit the PC board and the heat sink. Apply silicon compound to the transistor surface prior to securing it to the heat sink. Service Kit Contents: Part No. Q551 Qty. 2SD2499LBMA2 2SD2539LBMA1 "Lubbie" wrote in message ... Does anyone have a manual for this?? I'm looking for the original Output Transistor # if anybody has it. This TV has blown the output every year for the past 5 years( 5 differant shops).. Now I've ended up with it for repair.. Any help would be great.. Thanks in advance. |
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