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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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Brightness weirdness on Philips 20PT1553-00
I recently obtained an Philips 20PT1553-00 TV set. The picture is
usually relatively dark. I have to turn the brightness and the contrast fully up to obtain a viewable picture. The effect of the brightness-control is nearly non-existent. Sometimes (very seldom) the whole picture brightens up and the brightness-control works. This lasts usually bwetween 5 and 30 seconds. After that, the picture turns dark again. Has anybody experienced something like this before? Does anybody know what could be wrong? Thanks Eberhard |
#2
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Probably something in the bias circuitry to the CRT or in the video
processing circuitry. Could you post the diagnostics you may have actually preformed and their results? "ew123" wrote in message oups.com... I recently obtained an Philips 20PT1553-00 TV set. The picture is usually relatively dark. I have to turn the brightness and the contrast fully up to obtain a viewable picture. The effect of the brightness-control is nearly non-existent. Sometimes (very seldom) the whole picture brightens up and the brightness-control works. This lasts usually bwetween 5 and 30 seconds. After that, the picture turns dark again. Has anybody experienced something like this before? Does anybody know what could be wrong? Thanks Eberhard |
#3
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The turning-dark-again always happens, when I try to adjust the
brightness of the picture after it turned bright. As soon as the brightness is at approx. 2/3 the picture turns dark. The effect is not temperature dependent (happens after 2 hours or direct after switching on the set). Art schrieb: Probably something in the bias circuitry to the CRT or in the video processing circuitry. Could you post the diagnostics you may have actually preformed and their results? "ew123" wrote in message oups.com... I recently obtained an Philips 20PT1553-00 TV set. The picture is usually relatively dark. I have to turn the brightness and the contrast fully up to obtain a viewable picture. The effect of the brightness-control is nearly non-existent. Sometimes (very seldom) the whole picture brightens up and the brightness-control works. This lasts usually bwetween 5 and 30 seconds. After that, the picture turns dark again. Has anybody experienced something like this before? Does anybody know what could be wrong? Thanks Eberhard |
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