There aer two possibilities with this TV - the power board or the backlight inverters.
Both are known to fail over time and it's only a Fate's choice which one will go bad first.
Luckily neither failure is drastic or expensive to fix, at least as of the time of this posting.
The power board is already reviewed in another solution, so I'll only say that you should check visually for bulged caps and if you see some then you should replace them, but you should not automatically assume that this is what causes the problem; bulging caps are indicative, but not definitive for a problem.
Instead, what I wouuld recommend you do is measure the output 24V on the power board which goes to the inverters - be it the master or the slave inverter.
It's fairly easy if you go a voltmeter as several wires are ground and those are easy to tell as they are the same electrical potential as the metal chasis of the TV, i.e. the backlight panel and all the metal bolts that screw bolts to it.
Another few cables are the +24V.
if you have those when the TV is on as you have sound then it's most likely NOT the power board that's giving you troubles.
I can write a lot about the inverters, but instead I'll just point you to a fairly affordable and long-term solution to the problem:
Check the power supply and the backlight inverter board. If you are going to DIY and have proper tools and know safety precaution then please read on: 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: www.shopjimmy.com
Common problem with the LT42322 TV. One side of your power supply board has failed. This model uses the TOM277CABB power supply board and when it fails you get picture and no sound or sound and no picture and sometimes both go out. It is an easy repair. Here is a link to a post about repairing the power supply board.
Answers & Comments
There aer two possibilities with this TV - the power board or the backlight inverters.
Both are known to fail over time and it's only a Fate's choice which one will go bad first.
Luckily neither failure is drastic or expensive to fix, at least as of the time of this posting.
The power board is already reviewed in another solution, so I'll only say that you should check visually for bulged caps and if you see some then you should replace them, but you should not automatically assume that this is what causes the problem; bulging caps are indicative, but not definitive for a problem.
Instead, what I wouuld recommend you do is measure the output 24V on the power board which goes to the inverters - be it the master or the slave inverter.
It's fairly easy if you go a voltmeter as several wires are ground and those are easy to tell as they are the same electrical potential as the metal chasis of the TV, i.e. the backlight panel and all the metal bolts that screw bolts to it.
Another few cables are the +24V.
if you have those when the TV is on as you have sound then it's most likely NOT the power board that's giving you troubles.
I can write a lot about the inverters, but instead I'll just point you to a fairly affordable and long-term solution to the problem:
http://stores.ebay.com/CoppellTVRepair/_i.html?_nkw=LT42322+&submit=Search&_sop=10&_sid=6139882
For more details you may want to contact us directly or check our blog at http://blog.coppelltvrepair.com .
Check the power supply and the backlight inverter board.
If you are going to DIY and have proper tools and know safety precaution then please read on:
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: www.shopjimmy.com
Common problem with the LT42322 TV. One side of your power supply board has failed. This model uses the TOM277CABB power supply board and when it fails you get picture and no sound or sound and no picture and sometimes both go out. It is an easy repair. Here is a link to a post about repairing the power supply board.
http://www.ccl-la.com/blog/index.php/repairing-a-digital-lifestyles-lt42322-42-tv/
And here is a picture of the board.
I hope this helps, if so please rate my solution.
BuddyMc