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hi; there's a failure in power supply section. maybe H-out transistor inside or regulator has fail or burn out. this needs a TV technician to repair the problem.Not just like an LCD monitor that has block by block sections, CRT has many small parts to test and has to remove by desoldering its pins. and dangerous because its has a HIGH VOLTAGE in the tube. thanks.................
Hello, i have some method you may try.
1. Turn on your TV set, than wait whail untill picture off.
2. After picture off, try to knocking TFT panel smoothly. If you see flashing light from panel, its mean the backlight panel switched off.
Backlight panel consist of inverter board and ccfl inside the panel. If one of ccfl's burn out, all ccfl's will switched off by inverter board. make sure that the problemcomes fromone ofthese part. Replace it. I hope that will solve your problem. Thanks.
If you are lucky it may be asimple power supply problem, with dry electrolytic capacitors. If you can find one or more capacitors with domed tops instead of flat tops, then it is an obvious sign that the capacitors require replacing.
I have a king surro with a temperature control fault 2 resistors next to power transistor on pcb burnt out I can tell values of any other components on pcb but does anyone have a controller board who can tell me what value resistors are steve-- firstname.lastname@example.org
CAuses and soultion:
1) Duplicate H Out transistor
2) Check whether the H Out is a DF or AF. If it is a DF (With diode inside) an AF wont work
3) Disconnect the H Out and connect a 100 W bulb on the collector and ground. The multimeter reading should not exceed 120V. If it is more then check powersupply components especially the transistors and diodes.
4) If the power supply voltage is fine then the problem exists with the horizontal output section. Check the yoke for short ckt or the EHT transformer.
You have to check the high voltage diodes near the horizontal transistor and the small transformer. Diodes might have gone leaky. Check the capacitors also.Replace the black colored diodes with new ones with identical part no.
There could be two possible failures:
1. The backlights are defective (not a common failure for a 14 months old LCD) or the backlights driver/inverter is defective.
2. Power supply failure(very common failure on LCDs) will cause the symptoms you described.
Franko, If your sure about troubleshooting HI VOLTAGE then disconnect the horizontal output transistor first. Is it shorted? if it is get the fly and the transistor. But I wouldnt start it up with out a variac transformer. For the parts, go to http://www.partstore.com amd see what the parts cost or get the tele # and call them. BE CAREFULL. Good Luck