Question about Vizio GV42L 42 in. LCD Television
May be 1.5 surface mount fuse on Main Board. There are three. Check also for cold solder joints on the fuses. BEEATCHES!!!
Posted on Mar 26, 2010
May be this might have happened due to the overheating of the transformer ...
Posted on Apr 13, 2008
Sounds like the capacitors may be bad, maybe the amount of power to start the tv with at first isn't enough for some reason and then there is enough there the second time to start up the picture. That's where I would start first. Let me know how they check out and we can work on fixing this from there.
Posted on Apr 13, 2008
Some power components might be starting to fail slowly, becouse it seems it takes time for it to 'charge up'.
how to fix it? most likely some capasitors and other parts might need to be replaced.
Can some other expert confirm this for me? Im not fimiliar with this tv model.
Posted on Apr 04, 2008
One step closer to a component level repair:
Okay, I have had this problem and since I am a tech, I took my set a part last night for investigation...
- Audio hum
- Two shots turn on every single time after 8 hours
- Sound is hard to control (too high then too low)(Average:"14")
- The white Vizio logo dims as the picture comes on
This really seems like a capacitor issue getting old or with leaky electrolite issue.
- The solders on the power supply board were pretty good after 2 years of daily useage. Quality of the board assembly is quite good. It's not a cheap *** China shop quality.
- The hardware on the main board is quite impressive with 2 BGA CPU's, RAM, Flash, SMS on multilayer PCB... Again good quality there.
Now here is what I found... on the right side in the section near the sound IC: a major drip of junk (capacitor electrolite) about 3 inches long. I cleanedup the mess with a brush and solvent since this stuff is conductive it can short out signal. I could NOT find any evidence of a capacitor leaky pins or bulked-up top. The drip was in a clear spot with NO parts eventhough there are a whole lot of caps about 1/2" away.
Resoldered couple power transistors and reassembled the TV and test: Problem was still the same. Cleanup not enough!
So I am good to take the set a part again and concentrate on finding a bad cap in the audio section. I guess I will just start replacing a hand full of caps. Too bad I don't have the schematic to trace all the caps used to smooth out the power supply riples. Another way to go may be to find out which cap is getting hot under power because it is shorting out the power (+5 or +12). Wherever is that bad boy it is not used in signal processing.
Furthermore, the bad cap may have died because it's voltage is too low compared to the power riples (lot's of riple caps on the PS board already but perhaps too small: 2,000uF-35V radial should do).
By the way there is a Vizio service manual out there but it's worthless without schematics. It does provide the complete part list in case of burned/exploded parts.
Posted on Feb 16, 2009
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Posted on Jan 02, 2017
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