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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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Lubbie wrote:
Well called the suppliers and they have no idea of any kit available.. Do you happen to have the Part #'s as it was missing from the original posting... Some really nice person dropped a CT-29G5XB in my lap and ran like hell before I had a chance to ask him about it... Image what I found when i checked it out.. Same Stinkin Problem.. I am having the exact same problem with a TX-28DK1F (EURO-4 chassis). Q551 was 2SC5517. I replaced it with a BU2520DX, it ran cool, but it failed again. The kit, which is apparently discontinued (after only 3 years!) is numbered TZS9EK001. It would be great to find out what is in this kit. --- Met vriendelijke groet, Maarten Bakker. |
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Part No. Q551 Qty. R510 R511* Qty.
TXANV0198SER 2SD2499LBMA2 1 5.6KW 2W 2 TXANV0298SER 2SD2499LBMA2 1 1.5KW 2W 2 TXANV0398SER 2SD2539LBMA1 1 3.9KW 2W 2 TXANV0498SER 2SD2539LBMA1 1 3.6KW 3W 2 TXANV0598SER 2SD2539LBMA1 1 3.9KW 3W 2 TXANV0698SER 2SD2539LBMA1 1 3.3KW 3W 2.7KW 3W 1 1 "Lubbie" wrote in message ... Well called the suppliers and they have no idea of any kit available.. Do you happen to have the Part #'s as it was missing from the original posting... Some really nice person dropped a CT-29G5XB in my lap and ran like hell before I had a chance to ask him about it... Image what I found when i checked it out.. Same Stinkin Problem.. Thanks in Advance.. On Wed, 10 Nov 2004 07:48:32 GMT, Lubbie wrote: Thank you very much.. Let me know if you need anything.. Lubbie.. On Tue, 9 Nov 2004 18:11:26 -0600, "Lance Dyer" wrote: 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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