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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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Samsung Projection HDTV Convergence Problems
This Samsumg set is clearly not going to be an easy fix. It came in with
severe convergence problems - no two colors converged properly at any point on the screen. I started by checking the two large convergence IC's (STK392-010); both had the correct supply voltages, but two of the three sections on one IC were not functioning at all (input present but no output) so I assumed the IC was bad. For good measure, I replaced both IC's. Once powered up, the picture was still severely distorted but this time, ICZ103 (which was formerly bad) now overheats severely. So I tried disconnecting the output leads from that IC, and it now runs cold - but of course the picture is still distorted. At this point I suspect an underlying fault somewhere else, putting an excessive load on the IC and causing it to fail. I checked the three yokes and all measure the exact same impedance, ruling out the possibility of a shorted yoke. Because of the complexity of this set, it would be pointless to venture any deeper without the aid of a service manual, or at least some advice as to what the problem might be. Thanks for any advice. |
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