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Re: LG 20LS7D TV
1. Try this - hold the menu button down for 10 seconds. TV
should power up; you will have to turn off front panel buttons on menu.
2. You can also try a hard reset: Unplug TV from AC mains and remove all cables
from TV. Wait about 30 minutes and replug to AC power and redo the cabling.
Switch on the TV and see if it works..
3. Powering down the set or putting it in standby may
have allowed the power supply to cool. Weak capacitors often go out of spec
when they cool, thus preventing a section of the power supply from firing up
properly again. There is a simple trick...just warm the back of the TV with a
hair dryer for 5-7 mins after you have unplugged the TV. Look for the little
areas of holes in the back panel of TV. Use these as your guide at where to use
the hairdryer, but don't hold the dryer too close (say 5-6inches away). (Make
sure the dryer is on High heat). If the TV doesn't turn on after you have
heated it up (like it tries to come on but then turns off) you need to unplug
the TV again, this resets it. And repeat those steps till it works. Resetting
the TV after it fails to turn on is the key.
then the fly back unit is failed you need to resolder the contacts or get it serviced...............
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The board that controls the back light for the screen is called an inverter board. Sometimes, depending on the model , the inverter is combined with the power supply board. Go here to find the parts :www.shopjimmy.com
did you tried to look in the darkened room just to ensure if their is a white screen. if you could see a very dark screen like almost no backlight the cause could be the t-con board. you can check also the ballast board for screen back light which need to replaced .
When the TV is on, if you look at the screen and can see dark images, then you will need to replace both the inverters.The inverters drive/power the back light inside the LCD to show the images.You may have to try and different channels and or inputs to truly see if you can see dark images while the TV is on.If you are hearing audio from a channel or an input then you should be able to see the dark images if just the inverters are bad.
If the screen is dead black without any dark images, then typically your LCD screen/module is bad.
If the TV powers up (power supply is good), you have audio and the remote will work with the TV (the main board is good), the only parts left is the inverters or the LCD screen/module.
I can get you LG part numbers if you need them.
It looks as if the backlights are being switched off at start up, this will be due to a fault either with the inverter board or a fault with the screens backlights which would mean the screen needing replaced. Contact your repair centre to have an engineer give you an estimate on the cost of repair.
I work at CNN Have had 6 of these monitors go out in as many months. Take out the power supply and change the 2 exploded 680u capacitors. They're being overheated by the underrated MOSFETs on the reverse side of the board. I'm looking for some substitute MOSFETs that handle power better; but replacing the caps will usually fix the problem. Otherwise replace the supply.