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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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Sharp LL- T17A4-B lcd Monitor
Bought from the 'E' place for cheap. Reported symptom: video comes on
and fades out. Figured it was high ESR smps caps. Actual symptom: backlight comes on, image consist of random horizontal lines, which eventually--after some intermittent vertical scrolling--settle into a very nice image. Takes like two minutes to warm up. Shutting the monitor down for some unknown time starts the process all over again. Continuous viewing yields a stable image with good resolution, brightness and linearity. Shutting down for short periods is not problematic. There is only one HV (100 @ 400v) cap in the ps. ESR is .46, which I assume is within tolerance. Other caps in the ps also seem fine. This presents so like a classic cap issue (needs to warm up), that I'm going to next pull the video board and check caps there...possibly get some freeze spray and see if I can duplicate symptoms that way. Reality check: any problem with the above procedure, or experience with this particular monitor? Any suggestions as to where to go if the above doesn't produce a dx and fix? Thanks as always, jak |
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