Hi there it might b a little late with this as u posted this in may of 08 but my recent years of tv repair may help it could b the tuner in there older tv set had a similar problem with the tuner try opening tuner box it may need unsoldering but once in check all grounds for bad solder joints and resolder if needed the blue screen u see is normal when no signal input is found making it most likely the tuner.
hi again it may b of some help to know that i rewcently had a problem with my power supply i had 6 bad caps and that buzzing sound u mentioned sounds like the 2 large caps at the front of ur supply ie the power cord into board area r lettting the wrong power wavelength through ive seen it befors loud buzzing with color bars in screen power supply is good thought i got lucky with mine as it was just those six little caps power the power up and shut down ive heard the A/C wavelength through a set before and i was surprised to find it was the first large caps in the line where the power cord plug into board try it its cheap most parts can be found in a radio shack good luck. Populas
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Thanks, Populas -
Would the tuner cause this problem even when using input from VGA or HDMI? I have tried using these two inputs as well as the tuner with the same results - the blue screen isn't actually the same type of blue screen displayed when there is no input, but has bands of color through it, accompanied by a very loud buzzing from the speakers. Very soon after, the screen goes completly black. The front panel power button stops working, and we have to use the power switch at the rear of the tv to completly kill power. After about 15 minutes, we can flip the power switch and use the front panel standby button to resume normal use for another 20 minutes or so before the cycle repeats.
I thought that maybe the power supply might have a bad capacitor? Maybe I could replace the supply? Found one online for $150, but don't want to spend good money after bad if it isn't the likely problem.
PL
I fixed it - the power supply was bad. That explains the loud humming that accompanied the screen distortion - a cap was probably leaking, allowing some AC through. I didn't want to think about replacing any - the board is too crowded for my skill, so I put in a whole new supply. So far, everything is working OK, but I still wonder why the thing failed in the first place. Poor quality? It was plugged into a surge strip before, but I bought a new surge just to be certain a spike doesn't get through.
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Hi
It has main board problem. I have that main board and with shipping coast $160.00 but only we do exchange:
ATTENTION:
WE CHANGE YOUR BAD MAIN BOARD TO GOOD ONE.
OUR POLICY
1.YOU HAVE TO SHIP AN OLD POWER SUPPLY BOARD TO US
WE WILL SHIP NEW ONE TO YOU BY USPS IN 2-3 BUSINESS DAYS.
2. PLEASE PAY TO PAY PAL BUY FOLLOWING EMIL ADDRESS:
[email protected]
3.
PLEASE SHIP YOUR OLD POWER SUPPL BOARD TO FOLLOWING ADDRESS:
GEORGES ELECTRONIC
769 GLADYS AVE
LOS ANGELES CA, 90021
PHONE: 213 627 4071
FAX: 213 627 3944
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Have exactly the same problem. I use the VGA as monitor input from computer and thought that the computer had issues until the problem showed up while watching TV, too.
We have gotten adept at noticing the video quiver a little before the picture breaks apart and goes black completely - we quickly send the TV into standby with the little switch on the side. Otherwise, we have to shut the power switch off on the back and wait a few minutes before the screen will turn on again.
The audio also makes a loud hum as the screen goes black.
I would be grateful for any help!!
Having same problem as listed.....
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