I have a RCA 42" LCD model # L42WD22YX6. It has a bad backlight inverter. I did the flashlight test and can see a picture at an angle. I took the TV apart, took out both the Master and Slave inverters out and both had blown capacitors on them. I replaced the caps, put the tv back together, and tested it, still the same result, no picture. What other problem could there be with the tv? Could something else be bad and blew the caps? I checked the caps I put back in after testing it and they were fine. I'm no electronics expert, so I have no clue how to test voltages and all of that.
Thanks
Does the backllght go out after a few seconds? Could still be a lamp or something else on the inverter boards. You could try used inverter boards from the same set with other problems (broken screen), Or a complete working backlight from another set but very delicate operation to swap the LCD display from one panel to another.
So it is either the power going to the inverter board or the inverter board itself. Any chance of opening the unit and looking inside, with it unplugged from the wall socket? Do you have a multimeter?
This is where it can become dangerous if you are not familiar with the use of a meter and electricity. Lets keep it simple first. Open the back of the set (unplugged of course) and closely examine the components on the boards, concentrating on the power supply board. Follow the power cord to the first major board. It will have lots of large parts on it, mostly transformers and capacitors. The 'caps' will be the large round parts. Look for any that have bulged tops on them. These may be bad. Look for burned parts, bits of plastic from blown parts. It's a long shot, but nothing to lose right now.
The inverter boards usually have microfuses on them. They may have blown when the caps failed. Look for a very small component with an 'F#' next to it. This will be a fuse. Get a meter, set it to resistance and measure across the two ends of the fuse. A good reading will be less then 1/2 ohm. An open or blown fuse will have a very high reading, several thound ohms or infinity. Find and check all fuses. See if they have a value written on them such as 3A or similar.
×
2,231 views
Usually answered in minutes!
No, the backlight is completely out. It doesn't come on at all.
No, the backlight doesn't come on at all.
I do not have a meter, but if you would be so kind as to tell me what to look for, I will buy one and check it out. I appreciate your help.
Hello and thanks for your help. I have already taken the back off of the TV. I checked out the power board and nothing seems to be obviously burned, other than the two capacitors I replaced on the inverter boards. There was a burn mark on the inside of both the inverter covers. Other than that, I can't see anything that looks damaged. Thanks again.
×