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Here's the test. With the TV on shine a flashlight on the screen. If you can see a dim picture the backlight circuits are bad. If you cannot see a picture the T-Con board is bad. You can get parts from here: TV Parts Universal TV Stands DLP Chips ShopJimmy
mcdevito75 here, The key completes a warning circut in the off position of the ignition switch, this buzzing sound is a relay usually in the fuse box, find the fuse box, leave the key in the switch, listen and locate the buzzing sound and remove the relay from the fuse box, this relay may also be alone just under and around the steering column.
The buzz is the power supply attempting to power the set. The click is the unit shutting down. Can you pleae post the make and model as well as whether or not the standby light is blinking? With that info we should be able to give you some options.
Something has shorted in the set causing the power supply to make that buzzing sound. Most likely the short is in the horizontal circuit. The horizontal makes the high voltage work which in turn lights the picture tube.
Try to see if you have 5volts for your EEPROM. If the voltage is normal try to replace your EEPROM or try to reprogram it. Your EEPROM is corrupted so that's why it will not store data.
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