Model # 42LB5600-UZ Audio but no picture. Followed tips from shopjimmy.com and other sources. Found all LED's out. If TV is allowed to sit picture will come back but LED's go out on 30 seconds to 5 minutes. Replaced power supply/LED power board. Same problem. Found out put for LED's and measured 124 volts DC. When lights go out voltage is 0. TV only has 2 other boards if I understand correctly, main board and the small tcon board (I think that is the term). Do I next replace the main board? If Leds were bad wouldn't I still have voltage?
If you hold a flashlight up to the screen do you see any image or video
SOURCE: AKAI LCT37Z6TA TV Issues
Sounds like the main board as it has all control and signal processing on it.
SOURCE: Vizio 42 in L42HDTV10A no power no lights no nothing
You can look at the various module failure symptoms and service / replacement options for the L42HDTV10A here:
http://www.coppelltvrepair.com/search?Q=l42hdtv10a&As=false&Pf=&Pt=&Sid=false&btnsearch=Search
LCD simple panel check. In a dark room, (does not have to be total), shine a flashlight at it with a station tuned in. If you see images
and you have changed the panel HV board, your flourescent tubes could be bad. If you dont, then check the cabling.
Testimonial: "The back lights are on just video on the panel tv turns on and off as it should just not picture."
110 > 240VAC is the input voltage. Auto select by the regulator board inside. Electro help
Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
Some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.
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