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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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Hitachi rear projo dead.
Model # 50UX57B, Chassis # AP83R, dead. No startup in SMPS. After
doing the following repairs, it just won't oscillate, no leds on the main PCB light at all. It was worked on elsewhere, both convergence IC's were replaced, & E995, E996, as well as IK04, & IK05. D910, & D911 12 volt zener diodes shorted, C707 near the flyback, & horizontal output are fine, the SMPS just won't oscillate! The three opto couplers check ok, as well as the SMPS electrolytics! Ideas anyone? Thanks, Dani. |
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#2
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Hitachi rear projo dead.
Check the inverter transformer. It may have gone defective. You will need
another one to try. -- JANA _____ "Dani" wrote in message oups.com... Model # 50UX57B, Chassis # AP83R, dead. No startup in SMPS. After doing the following repairs, it just won't oscillate, no leds on the main PCB light at all. It was worked on elsewhere, both convergence IC's were replaced, & E995, E996, as well as IK04, & IK05. D910, & D911 12 volt zener diodes shorted, C707 near the flyback, & horizontal output are fine, the SMPS just won't oscillate! The three opto couplers check ok, as well as the SMPS electrolytics! Ideas anyone? Thanks, Dani. |
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