Question about RCA L40FHD41 40. in HDTV
Backlight is out. Doesn't flicker on or anything -- completely dark. However, the screen still displays the picture, but it can only be seen if you're shining a very bright flashlight on it. I've opened up the back and immediately found two capacitors with popped tops on the power supply board. I ordered some replacements 1000uf 16v and successfully installed them, but the issue persists. I don't know for sure if the problem is the power supply board, the bulb converter board or something else entirely. I've checked everything I could on this TV except the bulbs themselves don't have a clue how to get to them, and all looks to be in decent shape. Cleared up the minimal dust that was present, reseated all the connectors... Mainly, I'm looking for anything else I might be able to do before I give in and start buying whole replacement parts. Is it possibly a firmware issue? Is there a neat trick I might be missing? This is my first time trying to repair a TV, and I'm a novice at manual repair. I unfortunately don't have the proper tools to check anything in-board. Any sort of help or advice would be most appreciated. Thanks.
Backlight inverter section circuit is faulty. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should trouble shoot. Contact any service technician. The circuit will differ with models and versions.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.
Posted on Apr 25, 2015
Testimonial: "Luckily, the inverter board is separate from all other components, and I managed to find a replacement online for about $25. Not as steep as I originally thought. Thanks for the help!"
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Posted on Jan 02, 2017
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