Turn tv on fine minute later picture goes bad

SOURCE: My tv picture keeps goingblack every now and then?

replace the Power supply and if that does not fix the problem
you need to replace the LCD panel

SOURCE: Sony kdfe60a20 - The TV turns on but after a

classic Sony telling you the lamp is going bad. Replace lamp yourself it is consumer replacable.

SOURCE: I turn the TV on. Then about 3 minutes later the

When picture goes away do you see the screen still emitting light or does it go completely blank?

Depending on the answer there are two possiblities:

if the screen goes completely blank then the problem is likely in the TV's inverter and more specifically very likely in some of the high-frequency transformers. Best solution there is replacement.
Unfortunately inverters are often on one board with power in smaller TVs.

if the screen is still emitting light albiet being blank then the problem is more likely in the main board and, less often, in a cable.

Main boards often overheat and ICs relying on soldering contact bonds of 1/10 sq.mm. start misbehaving in all kinds of ways , including like you describe.

There's no simple cure for that problem - usually it's cheaper to replace the whole board or even the whole TV than to troubleshoot it.

Perhaps not great news, but that's what I know about it.

Good luck!
Bobby
http://www.coppelltvrepair.com

SOURCE: Picture great then goes black

has to do with the main board like the other guy said go to www.shopjimmy.com way cheap and its that one cuz was told to me by the manufacturer you call tv repair man they give you all this **** it can be the power supply or the main board bring it so we can tell you just to get the money for checking it out go to this site get it but be real careful with the screen you can do it your self i did mines aint no science.

Bud Martin

• 11361 Answers
• Posted on Jan 17, 2011

SOURCE: works fine for 10-15 minutes, then screen goes

It can be caused by unstable DC in the power supply due to bad DC filter caps, that will be the first place to look. I have a feeling that it may be the main board.
http://www.shopjimmy.com/catalogsearch/result/?q=LG+37LC7D+

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Please leave rating if it helps.