Screen just suddenly went dark although you can make some images out in the darkness! We have had this LG 42 inch plasma for approximately 2 years. Is it worth getting fixed or just scrapping it? Cost approx £800 new. Thanks
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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.
Take the back off with no power connected..You should have 2 invertor pcbs..one on the left and one on the right..well the side of the picture you cant see is the same side of the faulty invertor..replace this and this should solve the problem.it is the cheapest option..if not..im afraid is is a new LCD screen unless you are prepared to take it appart and replace backlight bulbs :)
If the screen is lighting up for a fraction of a second when you turn on & then goes dark, this indicates a fault either with the backlights on the screen or the inverter part of the monitor. You can check the backlights if you have access to a backlight tester, you need to remove the rear cover & connect the backlight cables into the tester, if this checks ok then look for a problem on the inverter board, checking the capacitors for any signs of distress.
Most likely what happened is one of the capacitors went bad. When a capacitors goes bad it produces a popping sound. This could be an easy and cheap fix if you find the bad capacitor or capacitors. The bad capacitor will have a bulging top most likely on the power board but could be anywhere.
maybe the inverter board for the screen issue- the power issue seems to be LG has power board design flaw- basically last time I looked the power board is manufactured NOT by LG but by H&E ...who designs this stuff??