Question about RCA 46 46LA45RQ LCD TV

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Lcd has no backlight, but still have audio

T-con board? inverter? what

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Posted on May 24, 2015


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Posted on Jan 02, 2017



The problem is not in the inverter board it is in the power supply R976 is fried. I need to fined the value of that resistor.

Posted on Jul 20, 2012

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Should I repair my Samsung LCD with a T-con board replacement?

Hi, maybe before replacing T-Con board it should be better to check voltages from power supply to the board, you could google for the service manual of your TV to have the right values of voltages and the signals you could check.

Nov 02, 2015 | Samsung LN55C630 TV

1 Answer

DP37647. Why does it have sound but no picture?

Check that do you able to see any light (back light of lcd) in the screen. If there is light then there is problem with the T con board of the tv. And if there is no light the there is problem with the Backlight inverter. Added the picture of both T con board and inverter board.


Backlight inverter


Sep 06, 2015 | Sanyo Televison & Video

1 Answer

I have a Proview LCD TV model # PA-32JK1A. When I plug in the TV, the orange standby light comes on like usual. When I turn on the TV (with the remote or the front panel) the blue power light will come...

Hi, I just read what you have posted on my LCD TV troubleshooting guide, it does not sound like bad T-CON board because you do not get the sound, you disconnected the main T-CON connector from the main board and get the glowing screen but you still do not hae sound.
In the LCD TV, you can discoonect the backlights inverter board power cables (cables from power supply to the backlights inverter board), and the T-CON board cables from the the main board to the T-CON, you should still get the sound since there are no feedback singals from the T-CON or from the backlights inverter boards to tell the main board that they are bad or not.
If you are 100% sure that you do not have sound on all the input modes then I would suspect the main board problem.
At least the backlights ineverter is good.
Do you get the 12v at the T-CON board surface mounted fuse?

Dec 20, 2010 | Televison & Video

2 Answers

Television has sound but a black screen

Tv turn on now,have picture flashes few sec.than died and have only sound left only?Yes,than the long board call the LCD inverter board is dead.The Long LCD inverter board help the tv LCD screen panel have a backlight to produced a picture.Tries websites like, to buy a long refurbish LCD inverter board for the replacement.

Nov 11, 2010 | Dell W2600 26 in. LCD Television

2 Answers

My hdtv image goes out after a short time of being turn on but I can hear the audio or the voice, could you tell me what could be wrong with it, thank you.

The tv have 1 or 2 a long board call a LCD inverter boards.These 1 or 2 long LCD inverter boards are dead.These 1 or 2 long LCD inverter boards help the LCD screen panel to have a backlight to produced a picture.Tries websites like, to buy those refurbishes 1 or 2 long LCD inverter board for the replacement.

Nov 07, 2010 | Sanyo DP32746 32 in. LCD Television

1 Answer

"my samsung lns4051dx xaa powers on and the audio works, but the screen doesnt come on. please help "my samsung lns4051dx xaa powers on and the audio works, but the screen doesnt come on. please help

It can be T-CON board, 24vdc power supply, backlight inverter board, main board.
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:

Failed TV and Monitors:

Capacitors kit: he can make you a set of caps.

Please post back what you find.

Oct 23, 2010 | Samsung LN-S4051D 40 in. LCD Television

1 Answer

RCA L42WD22yx6 with no picture , audio is fine.

Ur LCD inverter backlight board is dead.Replaced this LCD inverter backlight board will get ur picture back.Tries, to buy a refurbish LCD Inverter backlight board for the replacement.

Feb 27, 2010 | RCA L46WD22 Television

1 Answer

My TV image went blank, but the TV stayed on. What could it be.

The exact model number is necessary to determine the exact parts your TV has. Some models has suffixes in their numbers to indicate they have some differences in their parts. For example, the 42LG30 is different from 42LG30DC, 42LG30-UD and so on. But generally, there are three parts that has a direct connection with the dimming and illumination of the screen. These are the T-CON board or LCD driver, backlight and inverter or ballast. The T-CON board is responsible in driving the LCD panel to produce the appropriate video or image. The inverter or ballast provides power to the backlights to illuminate the screen. If one of these fails, you will not be able to see any image or video on your screen.
The T-CON board is bad when there's a glow on your screen indicating that the backlight is on but there's no video or image. In short, the screen is blank.
If the screen is black, no glow, grab a torch and shine it on your screen. You will be able to see a faint image if the T-CON board is good. This indicates that the backlight is off. Either the inverter/ballast is dead or the backlight itself is busted. But usually it's the inverter/ballast that has failed. You can tell that the backlight is busted if the TV is old enough that the mercury vapor inside the tubes has depleted.
The T-CON board and the inverter or ballast are not serviceable and must be replaced completely if faulty. Replacing these boards can easily be done. Feel free to inform me if you find which of the above is the root of the problem to guide you in the fix.

Dec 04, 2009 | LG 42LG30 42 in. LCD HDTV

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