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Question DetailsAsked on 12/7/2016

We have a 42in Toshiba LCD TV model C51237T3582K2. There is sound, the power light comes on, but no picture.

We have a 42in Toshiba LCD TV model C51237T3582K2. There is sound, the power light comes on, but no picture. We found a you tube video on how to fix it, but the numbers they say we should be getting with our multi-meter aren't what we are getting. It is my parents TV, my sister bought it from Costco. None of us can afford to repair it, but my husband is a computer tech so if he was instructed he could fix it. Can anyone help us?

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2 Answers


Has he tried configuring the screen - go through the setup menu. If the setup menu appears OK then the screen and video driver cards are OK - and the problem is probably in the input or video transfer card. If setup menu works OK, then check the cable box or antenna is actually connected correctly and the right place, that any intermediate box being used (cable box, analog/digital converter box, DVD/VCR etc is hooked up right, and that the setup is configured correctly for that device. The problem may be as simple as changing to channel 2 or 3 (whichever it uses for TV input) or changing configuration from cable box input to antenna or DVD or gamebox or whatever. Before moving it to your house it may very well have been configured to a different input device than you have connected to it, so it is just displaying what is being input - nothing. Though I have to admit the sound working may punch a hole in that theory - I really don't know how a TV splits the sound from the video signal - whether you could hear the sound without seeing the picture if the video input device is mis-selected. Give it a try - try different input settings and different tyhpes of input connections if the setup screen works.

Also - since it is in a different house - were they using cable TV or over-the air, and if over-the-air analog or digital signal (if both still exist in your area) - there might have been a cable box or analog to digital converter that did not come with it, for instance - or it might have to be reset to bypass the need for one of those.

Download manual (if you don't have it) from the web for setup instructions.

Also, many or most modern TV's cannot be configured from the front panel - you HAVE to use a remote to program its setup.

Otherwise, for electrical/electronic check, once he goes through and checks for loose connectionsor cables, next thing would be to check for power continuity from the power supply (which is likely working if the power light comes on) to each of the boards it feeds. From there he would likely need a digital probe ("computer" meter), not a plain multi-meter, so he can read the signal coming from the board to the screen and other boards to see if it is right, because most of the signals are intermittent data signals - so while it might peak at say 12V for instance in one place, the multimeter might not read that unless it has a peak-hold function - it might read an average voltage lower. Also, with low voltage digital signals, a regular electrician's multi-meter - especiallk non-digital ones - will not work right because their impedance is such that their very use in the circuit changes the reading significantly - takes a high-precision high impedance input meter to avoid unduly affecting the measured value by the very act of measuring it.

Unfortunately, he would need a technical repair manual from the manufacturer, which few give out.

My guess - since you have sound, I would guess it is one of several video cards gone bad because with good video cards and connections a physically intact (not badly broken up or penetrated by someone throwing something through it) LCD screen (unless it has been totally surge/lightning zapped) will show bars and colors, just maybe not a proper picture. Though these days, unless the problem is just local in the screen (burned out spot, streaking, bars, halo zone, etc) a totally blank screen is usually one of two things - not configured right, or a shot video card (one of several in TV usually).

Here are links to a couple of similar previous questions with answers which might help too -

Answered 3 years ago by LCD



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Answered 3 years ago by Member Services

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