Hello Bobby, hi, well, most common solutions, would be to tighten all screws, and clean contacts of the main board to the LCD panel due to poor connections.
One possibility is:
Do you have LCD illumination? If the LCD is totally black, you may need to replace the inverter board.
Or :
You need to open up the back cover and locate the main board, (usually the biggest circuit board), try to loosen and then tighten the screws, check for good contacts, make sure all cables are tight and neat (especially the cable from the LCD panel to the main board), then test.
Or this may be:
Check also for loose cables from the power supply board, a loose cable here can cause several portions of the main board to fail so make sure they are snug and tight.
Worst is:
If the unit does not respond, you may need to bring it for service, I see replacement of the main board.
SOURCE: has sound but no picture
Is known problem at servicepoint if there is no white/yellow light present/visible at the (lower) backside of the flattv. This is indicatorlight of a certain condensator. If there is no light than servicepoint needs to instal new condensator. good luck
SOURCE: Philips flat screen tv will not power up.
Symptoms of a Defective or dying Power supplies on LCD TVs.
1. Light(s) on the front panel are behaving not normal example, blinking, amber color or
not steady, fainting, etc.
2. TV not turning ON properly.
3. TV turns OFF by itself.
4. Needs to be unplug to many times to make it work.
5. Humming or high pitch noise heard through speakers or at the back of the TV.
I repair these power supplies. Write to [email protected] if you require further assistance.
SOURCE: no picture on flat panel tv. has sound
Sounds like the digital control board, 6871qch038a Lg Digital Control Module subs to 6871qch038c. But that's just a first something I would check in this unit. Replace also capacitor C19, 630V big blue square cap very common failure for no video. You might want to shop this one thee are a host of problems with this unit that would certainly get some needed attention if a qualified tech were testing it and looked up the bulletins.
Good Luck!
William Rayburn, CET
Premium Technologies
SOURCE: Philips Flat Screen TV has sound but no picture
My Philips 50" Flat screen has sound but no picture. What should I do?
SOURCE: Have a philips flat screen model no. 42PFL7422D/37
Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
Parts: http://www.shopjimmy.com/catalogsearch/result/?q=Philips+42PFL7422D+
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