Hi,
There can be two possibility for this problem. Lcd driver or the lcd itself faulty. In most cases the lcd driver will become faulty. I have added a picture bellow. There is a circuit board inside your tv like this Covered by a metal cover. Remove the metal cover. You will see there will connection on three sockets. of which 2 will go to the lcd panel and one will go to the mother board. Before replacing that board carefully remove the wires from the sockets and then reconnect the same. some time improper contact can cause this problem.After that check the tv. If then also the problem remains you have to replace that circuit board as whole.
ok
SOURCE: 32LH20RMA problem is half of
Please read or download the info about fail T-CON/LCD panel and see the example of failed T-CON and LCD panel. http://www.scribd.com/doc/25276757/E40951307-TCON-Troubleshooting-10-22-09-OPT PDF download: http://www.mediafire.com/?zzjygannjty LCD panel: http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/ LCD panel: http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/
You may want to try to reseat the ribbon cables between the LCD panel and the T-CON board first.
See FIGURE 4 of the download.
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: http://interliquidparts.com/
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series
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