Tip & How-To about Televison & Video

How to tell if your LCD television has a picture but screen is dark.

One of the most common failures with LCD televisions is sound but no picture. The frist thought around this failure is that the television has failed and the screen has went bad, in some sense it has, but you can determine if the screen is good but the lamps are just not lighting up.

First turn on the television after the television is on darken the room as much as you can, when you hear the sound from the tv take a flash light and using the vent holes in back of the unit shine the flashlight thru the vent holes toward the front of the screen. If the video circuits are funtioning ok then you should be able to see a picture on the screen.

If a picutre is seen this indicates that the televisions video circuit is functioning ok but the backlights or lamps are not functioning. Of course this does not apply to plasma televisions because the technology matrix of this type of television is very different.

At this point you can focus on finding out why the lamps are not lighting, most probable cause is faulty or missing inverter board voltages or just a bad inverter itself. The inverter board is responsible for lighting the lamps and keeping then on. Check the power supply for faulty capacitors and also check the small transformers on the inverter board for faulty connections.

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tv comes on then picture goes out but still has sound but no picture

Sounds like a back light failure. To verify this, turn on the set, dim the lights in room. Shine a bright flash light on the screen, if you see a faint picture on the screen, you have a back light failure. You either have a blown back lamp, 24v circuit fault, or a failed inverter board.

Dec 16, 2012 | Sony KDL-32M3000 32 in. LCD Television

1 Answer

sound no picture

Its a common problem for this model.
1. Is there any flash of light from the backlights (best viewed from the back of the TV with the back removed)?

2. Have you tried shining a flashlight on the screen to see if a display is present when power up?

There are three possible failures.

1. A failure in the main board.

2. A failure in the LCD panel / Tcon

3. A failure in the inverter / backlight system. This could be as simple as a blown fuse.

Thos three failures would mean it needs to be service.call RCA

Jan 05, 2011 | RCA L42WD22 42 in. LCD Television

1 Answer

while watching the TV the picture suddenly went out - still have sound. Turning the TV off and on again does not help - the POLAROID Logo displays, but when the station connects - still no picture

possibly external power supply faulty under load it may fail these power supplies ofen have capacitor failure open the power supply to check for leaking/bulging/swollen capacitor is around 2000uf rated at 12v

Apr 28, 2009 | Polaroid FLM-2011 Television

2 Answers


There could be two possible failures:
1. The backlights are defective (not a common failure for a 14 months old LCD) or the backlights driver/inverter is defective.
2. Power supply failure(very common failure on LCDs) will cause the symptoms you described.

May 22, 2008 | LG RZ-20LA70 20 in. LCD Television

1 Answer

Dell W1700 LCD mon/tv

The following pertains to most LCD sets:
This could be a partial power supply failure, a drive board failure, or more commonly the backplane lamps and or their ballast supply have failed.

If you contact DELL, they will tell you about how to get your set serviced.

Jerry G.

Aug 06, 2007 | Dell W2600 26 in. LCD Television

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