Question about LG 32LC2D Television
When I turn on my TV I get a brust of audio distortion and an occasional green screen. The audio distortion blast goes on even with the speakers turn off and presist until the TV is warm. this seems to be the lastest progression of a problem that I noticed about a year ago where the DTV channels would not come in until the TV warmed up (5 min.), then I noticed that the cable channels were flipping with a multi horizontil lines running through the picture. these problems only happen when the TV is turned on after being off for at least an hour, when the TV is warm there are no probs. pictures prefect and so on but when I turn it on in the morning the distortion blast is so loud it vibrates the walls.
It turn out to be a $10 diode on the mainboard, which cost me $100 to have troubleshot and repaired
Posted on Apr 27, 2012
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Posted on Jan 02, 2017
This could be 1 of a few things here. Without opening up your set and trying to look at voltages or indiciator lights I couldn't tell you exactly without some more info.
Without looking at it myself here are my thoughts and where I would first look at.
It may be a main board because:
1) Main board processes all your audio/video signals. Bad main board means bad video processing. Could do that. Especially if the main board is not sending the right signal or a bad signal to the rest of the boards so they don't do their jobs.
It may be a power supply because:
1) Power supply is well, the power supply. If it's sending inadaquete voltage to the main board you may not be recieving enough juice to keep that main board doing your video processing or further up the line keeping enough juice flowing to your TCon board to keep it telling things where to go and what to do. The power supply sends voltages to your Ballast board(controls your lights) and to your main board through which power is supplied to your TCon board via a LVDS line and a +12/+16V signals. If the power supply isn't pumping out enough juice to keep the TCon or Main Board running, it could be a problem. By the same token it could be that your P/S isn't sending power out to your ballast board.
It could be a TCon because:
1) If the TCon is bad, you won't get your pictures. This could be the TCon board itself or the LVDS cable from your TCon to your Main. However, with few exceptions, if it's a bad TCon you're looking at a total panel replacement.
It could be a ballast board because:
1) The Ballast Board controls the lighting behind the LCD screen. If this isn't working right you won't be seeing much of anything without that back lighting. If this is bad, it's a panel replacement. These are not field replaceable items by LG.
Based on the symptoms, without more data or a eyes-on view of it, I would say you're most likely looking at a Main Brd or PSU problem.
Posted on Feb 21, 2009
SOURCE: frozen picture on LG LCD 37"
Try One of your working TVS and connect it to your cable outlet of the TV that is having problems. If that TV Does not work then there may be a degraded fitting or the Leg coming of the splitter to that outlet could have a Low Signal Problem
Next Take the First TV that was not working properly and put it on the cable outlet of one of the TVs that is working properly and if the TV set works on that Channel then you know it is not your TV that it must be the cable
Posted on Feb 28, 2009
This sounds like the power supply that feeds your back-light is going out. This repair should be done by a qualified technician
Posted on Mar 13, 2009
You will either have a fault with the inverter board which drives the backlights or a faulty backlight in the screen. If the problem is a backlight then a replacement screen is the only cure. One or the other is breaking down after it has been opn for a certain period of time, have an engineer call out & check with a tester if it is a screen problem.
Posted on Dec 19, 2009
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