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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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Hitachi 50FX18B Intermittent Power Supply
Just thought I'd see if anyone knows of some common problems and fixes,
before spending any great deal of time or money on this. Sometimes the set starts for a while then quits, other times the switching supply will sputter for a few seconds and fail (the red diagnostic LED then lights brightly). No cold solder to be seen, and the caps all check good. I'm leaning towards a bad switching regulator IC (STR-M6511) and/or optoisolator, but I'm really not sure how to confirm this without replacing anything. Disconnecting the loads from the secondary side of the supply (one at a time) does not change the symptom. Thanks for any advice. -- To reply via Email, remove NOSPAM from the address |
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Hitachi 50FX18B Intermittent Power Supply
Chris F. wrote:
Just thought I'd see if anyone knows of some common problems and fixes, before spending any great deal of time or money on this. Sometimes the set starts for a while then quits, other times the switching supply will sputter for a few seconds and fail (the red diagnostic LED then lights brightly). No cold solder to be seen, and the caps all check good. I'm leaning towards a bad switching regulator IC (STR-M6511) and/or optoisolator, but I'm really not sure how to confirm this without replacing anything. Disconnecting the loads from the secondary side of the supply (one at a time) does not change the symptom. Thanks for any advice. Even though the caps check good they are I'm sure dried out and failing change out all the large caps near the regulator , or fet it the primary of your supply I doubt the fet is bad they either work or don't and short out |
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