Question about Vizio 42 in. LCD TV
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Posted on Jan 02, 2017
It can be the main board, power supply, backlight inverter, etc.
You need to do some troubleshooting to narrow down the probelm, so please read my guide first.
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
Please see my basic troubleshooting guide here:
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com just make sure to use caps with low ESR, 105c rating such as PANASONIC FM or FC series.
Please post back what you find.
Posted on Nov 25, 2010
Hopefully you did not try to take the circuit board from the broken LCD and graft it onto the good one - the possibilities for problems are enormous.
Double-check all of the connectors, then compare the model numbers of the main board and power supply between the two sets. The cable between the LCD and the main board is often rather fussy and delicate - DO NOT pull on the wires! You may have to swap cables also. If the main board is different, try the one that went with the good panel (from the VO240E), and hope that part is good.
Note: electronics are susceptible to damage from static electricity. Handle the circuit boards only by the edges, and try to maintain contact with the metal shielding parts as much as possible (an anti-static wrist strap is a good means) while working on the set to discharge any static buildup on yourself.Once you are done, there is an e-Bay market for the remaining parts. If you have identified the bad board from the VO420E (by elimination), you can get more for the others, and you may still be able to sell the bad one to a reconditioning company, who will repair it and resell it.
The worst case situation is that the LCD panel driver board is bad, but as I understand your situation, the VO240E wouldn't turn on anymore. That is usually a power supply problem.
Posted on Dec 11, 2011
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