Question about Flat Panel Televisions
I am going to assume that you have a flat screen CRT type unit the utilizes an Integrated High Voltage Transformer which uses a focus block (either internal or external to the transformer). Now by making this assumption, This makes your problem one of the focus block or the IHVT going bad. In order to check this problem I would use a high voltage probe to check the voltage on the anode of the CRT (20KV - 30KV) is expected. Once the anode voltage is checked look at the schematic to determine if the voltages are correct. If the voltage is not correct then check the voltages being supplied to the transformer and compare them to the schematic values, once this is done what you should begin to see is differences in the voltages in the set vs what is shown on the schematic. I would take a guess and say that the problem might be one of a bad focus block since that would cause the symptom you are seeing, but nothing beats troubleshooting the problem. if the IHVT is bad get the part number and order the part then replace it. You will need to have a voltage meter, an ohmmeter, an oscilloscope, a CRT analyzer, and a High voltage probe to troubleshoot this issue. If you do not know what these pieces of equipment are and what they do, I would advise calling your local TV shop and having them look at the set and determine the proper course of action, If you do know how to use these tools, the repair should go quite easy.
I hope this helps,
Posted on Dec 29, 2007
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