MODEL: VG700b
SIZE: 17"
PROBLEM: GREEN PWR LED STEADY ON. NO PICTURE. NO CCFL FLASH.
SOLUTION: CHECKED PWR/MAIN BOARD FOR OUTPUT VOLTAGES TO INVERTER BOARD. FOUND 12V AND 3.3V. NOTHING WITH 5V. ASSUMED THE PROBLEM WAS ON THE PWR SUPPLY SIDE OF THINGS, AS THERE WAS NO 5V WITH BLACK LEAD TO CHASSIS GND. TRACED 5V PIN DOWN CIRCUIT AND DID FIND VOLTAGE (AGAIN WITH BLK LEAD TO CHS GND). DISCOVERED THAT 5V WAS PRESENT AT OUTPUT PIN WHEN BLK DMM LEAD WAS PLACED ON PIN AND RED PROBED TO SOURCE. BASICALLY THERE WAS 5V GOING ALL THE WAY UP TO THE OUTPUT PIN, WHY IT DIDN'T REGISTER WITH REFERENCE TO CHASSIS GND, UNKNOWN. SO WITH THIS INFORMATION, THE INVERTER WAS NOW SUSPECT. I FOUND THE 12V FUSE BLOWN ON IT. MUST SOMEHOW TIE INTO 5V CIRCUIT AND ALLOW IT TO COMPLETE. FUSE WAS RATED AT 4 AMPS, REPLACED WITH 5 AMP. WORKS GREAT!!!
UPDATE: USING A HIGHER RATED FUSE CAUSED A FIRE TO START INSIDE THIS MONITOR. WHICH QUICKLY SPREAD THROUGHOUT MY HOME AND DESTROYED EVERYTHING I HAVE EVER OWNED. I THINK NEXT TIME I'LL USE THE 4 AMP FUSE.
PS. Don't tell my insurance company about this little slip-up. Thx!
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