Question about RCA 46 46LA45RQ LCD TV

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46LA45RQ. I replaced T-Con board, backlight invert.er and power supply. Still black screen. What can I do. My backlight lights up for 2 seconds and then goes out

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  • RCA Master
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I would really suggest you just replace the TV.

Posted on Dec 04, 2016

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Posted on Jan 02, 2017

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2 Answers

Sanyo DP46142 TV comes on for approximately 30 seconds and then screen goes black. Power LED stays on.


Sounds like a backlight problem to me. If you input a signal to the HDMI or Composite input and then it goes black have you tried taking a flashlight to the screen to see if the picture is still there but just dark? That would indicate a backlight issue. That model appears to be an LED edge lit backlight, so if the picture is still there after going black your going to have to trace out the backlight circuit and see whats going on. Usually with LED backlighting if it comes on at all then the LED's are good, its just the driver supply thats failing to keep them on. Some TV's have a small separate board that provides the backlight control, but i suspect with this model its on the power supply board and not the motherboard. Have you checked that board? It could be bad caps on the power supply board, check the voltages to the backlighting when it lights up and then when it goes dark. It could just be some failed capacitors on the power supply causing that voltage rail to drop off.

May 04, 2017 | Sanyo Televison & Video

1 Answer

Channel bar comes up for approx.2 seconds then disappears. during this time is the only time I can get a menu or picture. After 2 seconds is up screen goes blank but sound still works


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.
http://electronicshelponline.blogspot.com/.
Some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.

Jul 27, 2015 | RCA Televison & Video

1 Answer

Rca 46la45rq has backlight and power but no sound or picture replaced main and inverter boards


Was this the original problem before replacing the main board?
Maybe you have to set the new main board from maintenance menu. Sound and image comes from the main board, so i believe it has to be something about it...

good luck

Aug 31, 2014 | RCA 46 46LA45RQ LCD TV

1 Answer

Rca tv powers up has backlight no sound or picture replaced main board and inverter


I would check the input board for correct power supply input
check the blue 15pf 6kv caps near the output from the PSU to the inverter.

Aug 31, 2014 | RCA 46 46LA45RQ LCD TV

1 Answer

No picture sound ok rca 46la45rq


Sounds like backlight is dead. Shine flashlight on screen. Can you see video slightly. Replace inverter or some sets have inverter as part of power board. If led set replace led driver board. Also that may be part of power board.

Mar 31, 2014 | Televison & Video

1 Answer

I have a 52" westinghouse


Ok you have a lot of things going on here. Your first thing with the lines can be your T-con board or your Signal board or the screen itself. The second thing black screen you would have to be more specific? Is your back light on and you have no image? If that's teh case then I would replace the T-con board or the Signal board. If by black screen you mean there is no light on the screen from the backlight inverter then your BAcklight inverter or the backlight itleft might be bad. and ontop of that you might have the problem that we started with also. You can get westinghouse parts from www.interliquidparts.com You have to order by part numbers so you have to get the number from the actual part of your TV.

Jun 13, 2011 | Televison & Video

2 Answers

When I turn my TV on there is sound, but, the picture vanishes after a couple of seconds. Why?


The backlight inverter is what powers the screen to "light up." You will need to check your power supply for the proper voltages going to the backlight inverter. If those all check out ok, then you need to replace your inverter to get your image back. You can find a new inverter by searching "inverter + model number of your tv.



Please rate if this helped :)

Apr 04, 2011 | LG Televison & Video

2 Answers

My Westinghouse SK-32H540S pictures shuts off after 10 seconds. the sound stays on but no picture. is it the troubleshoot? i tried unpluging everything and repluging it and still the same thing happens...


This problems are the tv 1 or 2 long LCD inverter boards are dead.These 1 or 2 long LCD inverter boards provide the tv LCD screen pannel a backlight to produce a picture.Tries websites like Shopjimmy.com,Ebay.com to buy those refurbishes 1 or 2 long LCD inverter boards for the replacement.

Mar 24, 2011 | Westinghouse SK-32H540S 32 in. LCD TV

1 Answer

I have a 42mf438b/f7 42" magnavox LCD. I turn on the tv and it stays on for about 3 seconds. I see the station and then it goes black. I have sound but no picture. I did some research and thought it was...


The backlight inverter board or the CCFL lights are defective. Since the backlight inverter board is integrated with the power supply, replacing the power supply would be the next step. I would suggest that before replacing the power supply to measure all the voltages going to the main board. If the voltages appear to be low then this could be due to defective capacitors that are swelling or bulging on the top.
Let me know if you require further assistance.

Sep 21, 2010 | Televison & Video

2 Answers

MONITER LIGHT IS GREEN BUT ONLY SHOWS A NORMAL SCREEN FOR 1/2 SECOND THEN TURNS BLACK


HI. I had the same problem with mine. It would flash the screen on for a split second and then turn black, the whole time the power light remained green. Upon opening up the case, I pulled the combo power supply board/inverter board out for inspection. I noticed one of the capacitors had a bulge on top indicating it was bad. It was the the 680uf 25v capacitor. I desoldered it, and soldered in the new one. After hooking everything back up, bingo!! Monitor now works perfectly. I couldn't find an exact match to the capacitance locally, but I had a 1000uf 35v cap in my utility box. It worked fine as a replacement. You can usually go within 30 percent of tolerance and be alright. Just don't go under on capacitance or voltage. I hope this helps.

Nov 25, 2007 | LG Flatron L1710M 17" LCD Monitor

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