Question about RCA L26HD35D TV
There are a couple of possible causes for the problem. Look closely at the screen from about an inch away from the screen. Shield your eyes from the room light and look for a faint image (sometimes a flashlight helps you see this image). If you see an image then it's probably the backlight. If you see nothing, it's probably the backlight inverter (possibly the backlight too but you can't tell without checking both). The manufacturer will recommend replacing the entire board instead of just one part of the circuitry. The inverter usually fails suddenly; the backlight usually fades or makes the image look pink/red as it fails.
If the TV is under warranty, use the warranty repair. Otherwise, open up the TV (the back). Remove the shielding around the boards (ground yourself to the TV by touching some metal part on the housing or use a anti-static wrist strap). Look at the board(s). Do you see any scorch marks or capacitors that are bulging or leaking? The capacitors look like cylinders on tripods. If you see this damage, you could just replace the capacitors and the resistor that acted as a fuse but other parts of the circuit could be damaged. Instead I recommend replacing the inverter. Note the part number on the board and search for that particular unit - including the Rev number if included. (They run $50 to $150. Universal inverters do exist but might cause the controls to be reversed. Up for lower brightness for example) lcdparts.net has many of the parts for tv backlights and inverters but isn't the only source.
If you don't see the damage, you could check the inverter with a multimeter that measure in kHz (50 kHz range recommended) or an oscilloscope. Hold the multimeter probes about an inch above the circuit board and a fraction of an inch apart with the TV on. If a frequency is given or a value of 1 is shown, the inverter is good. If you see a value near zero, the inverter is bad or the multimeter can't measure the frequency (too small a range).
The inverter is relatively simple to replace. Unplug the tv, unplug all of the wires on the original and unscrew it from its mount. Plug in the wires to the new one. The wires connect like molex plugs on a computer. (Power and individual backlights, etc.) The backlights are on the perimeter of the TV and are often molded into the plastic frame of the TV. You have to carefully remove the cover and the reflector among other things then Dremel (or use a similar rotary tool) to remove the plastic to remove the original backlight. Pay attention to how it was positioned originally since there isn't any extra space to jiggle things into place. Google backlight replacement for pictures, videos and text descriptions of the process.
I hope this helps.
Posted on Jul 08, 2010
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Posted on Jan 02, 2017
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