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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 TV power problem
Have a Hitachi 50" model #50EX10B, chassis AP32. I don't have the
schematic, but the set intermittently won't power up. Push power button, and hear the relay energize, red light on panel comes on, then light goes out. Set won't power up. Measured correct B+ up to switching IC? 5 pin connected to power transformer. Resoldered many points hoping for best, but as said, problem is intermittent. Cold or hot set makes no difference, since problem persist regardless. Anyone have experience with this type problem with this particular set? Trying to avoid buying a schematic. Thanks to all. |
#2
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High ESR capacitors in power supply. Pretty common problem. Easy to
fix without schematic, but you need a good esr meter. |
#3
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Do you have vertical deflection at attempt power on?/ Are the proper +-
supplies applied to the convergence output devices?/ Etc wrote in message oups.com... Have a Hitachi 50" model #50EX10B, chassis AP32. I don't have the schematic, but the set intermittently won't power up. Push power button, and hear the relay energize, red light on panel comes on, then light goes out. Set won't power up. Measured correct B+ up to switching IC? 5 pin connected to power transformer. Resoldered many points hoping for best, but as said, problem is intermittent. Cold or hot set makes no difference, since problem persist regardless. Anyone have experience with this type problem with this particular set? Trying to avoid buying a schematic. Thanks to all. |
#4
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The Flyback Xfmr is a pretty common culprit for this problem. Part No.
2436394 or 2436493A. Both are NLA from Hitachi, but there is new old stock available for purchase at Technotronic Dimensions. wrote in message oups.com... | Have a Hitachi 50" model #50EX10B, chassis AP32. I don't have the | schematic, but the set intermittently won't power up. Push power | button, and hear the relay energize, red light on panel comes on, then | light goes out. Set won't power up. Measured correct B+ up to switching | IC? 5 pin connected to power transformer. Resoldered many points hoping | for best, but as said, problem is intermittent. Cold or hot set makes | no difference, since problem persist regardless. Anyone have experience | with this type problem with this particular set? Trying to avoid buying | a schematic. Thanks to all. | |
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