The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
SOURCE: Sharp LC-37SH12U LCD TV is 20 months old and would not power on
Your power supply unit needs servicing on some part replacements. bad capacitors, voltage regulators, hi-watt resistors,....etc
SOURCE: Sharp lc-32sh12u...no picture
It can be either the LCD panel driver board, or the worst case is bad LCD panel.
Testimonial: "Thanks for the response. I found a PWB board, a Power board and an AV board. Would one of these fix the problem?"
SOURCE: tv turn it off and turn it on every 20 min
put tv into standby and press INFO / MENU / MUTE / STANDBY on remote you have to be quick
the tv will come on with factory settings on screen
ONLY USE DOWN NAVIGATION KEY move to reset and press RIGHT NAVIGATION KEY press standby to exit
tv will come on and will need retune
if this not help then will be capactors on mains power board failing look at them and if any have raised tops replace then
SOURCE: "47 LG LCD TV automatically turns off by itself"
Your Power Board is going bad. I think this set has a one year warranty on parts.
SOURCE: My Sharp tv has vertical multicolored lines that
my new lc60le820un sharp is doing the same thing after two weeks. i called sharp they want to fix it. i want a new tv. after a few minutes of this i hung up and and called hh greg to replace it with a sony. thanks hh greg the sony is fine
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Hi Alfredo Martinez, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? what do you mean?
I have a sharp tv and take like 20 mins to see the pics
I want to know what it's the problem
After 20 mins it's clear in the pics
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