Question about Samsung LN-T4665F 46 in. LCD Television

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Lcd, picture not showing up

When i turn the LCD on the picture comes up for a couple of seconds then it turns dark but you can still hear the picture of anything

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Re: lcd, picture not showing up

We may neet to begin contacting the attourney general. Seriously we may all have to write letters. I am willing to organize this if others post a willingness to engage in this process. Samsug customer service told me that what people report on the internet has nothing to do with Samsung. I explained that I was not wanting to report to the internet, that I was calling to report my number to them. It took some arm twisting to get her to give me a contact on who to report the problem too. They won't listen to internet blogs and I don't blame them for that. However, I was reporting directly to Samsung and they did not want that too happen either. That is not ok. We need to get the attourney general involved. Who is with me?

Posted on Mar 27, 2009

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Re: lcd, picture not showing up

Im in. No TV should only last 1-3 years !!!!!!!

Posted on Feb 24, 2010

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Re: lcd, picture not showing up

This may be the backlights and or the backlights power supply is in failure, or the drive board is not working properly.

The set will have to be serviced. In some models, the backlights are not replaceable. In this case they would have to replace the screen. The service center can tell you for your particular model.

If you want to verify the backlights, in a darkened room shine a flashlight at an angle in to the screen while the set is running. Look at various angles to see if you can see an image. If you can see a proper image, this means that the backlights and or the power supply for the back lights has died.

Jerry G.

Posted on Jun 28, 2008

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Re: lcd, picture not showing up

True.. I had an old TV at my grandparents. that model lasted for more than 20 years now. and my Samsund LCD is having problem as soon as it completed its warantee. Form that day each year it have some problem and every time I do something and it works. But this time, it is BIG. Screen Blackout, only audio is there. I searched many blog all are complaining about the same problem Samsung LCD's are having. Company is just interested in selling products and not retaining their customers. There are costly product and should work atleast 10 years.

Posted on Jun 20, 2013

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Re: lcd, picture not showing up

I am having the same issue with my DTV antenna, but I am able to use the other inputs for Roku and for PC connections, etc....

Posted on Sep 05, 2012

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Re: lcd, picture not showing up

I am in! Mine just started doing it today. got home from work turned on the LN-T4665F no picture just a hum and shut down. Not happy about this i love that tv. Products need to be tested better before sold on the market, or cheaper if their only gonna last a quarter of the life expectancy.

Posted on Jan 20, 2010

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Re: lcd, picture not showing up

I am with you, I have the same problem! let me know what I can do to help your law suit.

Posted on Jan 04, 2010

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Digital lifestyles model fa2b 32570

Could be a couple of things.
The good news is that the LCD panel is working, albeit briefly.
It definitely sounds like it's repairable, though.

Dec 03, 2013 | Flat Panel Televisions


How would you explain a momentary picture that goes dark?{meaning turn it on...

This is the basic guide that can be applied to most LCD flat panel TV.
By Bud Martin
First, try unplugging it from the outlet for about an hour to see if the TV will reset itself since the minute the TV is plugged into the wall, the power supply and processor will be running 24/7 and the EPROM can get corrupted by spikes and surges. Try using good quality surge suppressor to see if it will help if it happen often.
Look for burnt brown hot spots on the circuit boards, capacitors with leaking/bulging top or seals. Loose wires and connectors. Blown fuses.
Notes: We are dealing with high voltage that can kill you! so if you are not sure what you are doing, please have it fixed by the pro that has proper tools and safety equipment. Try to use GFI outlet and isolation transformer when work around the TV set and DO NOT DEFEAT THE GROUND PIN OF THE OUTLET/POWER CORD.

1) The power supply module (There are 4 regulated output voltages:- Standby 5vdc, switched 5vdc, 12~16vdc, and 24vdc).

The power supply converts the 120/230vac 50/60Hz into DC, then the high frequency (50~100kHz) switching circuits convert it back to AC but at high frequency which allows the power supply to use smaller and much lighter weight transformers (Ferrite core instead of heavy iron core), then this high frequency AC voltage is fed to the rectifier Diodes to get the DC output and filtered by DC filter capacitors that must have low ESR (Equivalent Series Resistance), if general purpose electrolytic caps are use, they will fail within a year or less due to high ESR.

The power supply has Standby 5vdc (5VSB, this is a MUST have before anything else will work, when this voltage is not present, there will be no any indicator light on the front panel) which is always on the minute the TV is plugged into the AC outlet, so it is on 24/7 and that is why the power supply will fail even though you may use the a TV not very often. It will see all the voltage spikes and surges 24/7.
This 5vdc is used to power the Processor and the Infrared remote receiver module which will be waiting for the command from the remote control or from the power switch, when the Power on command is received, the Processor will send the turn on signal (3.3~5vdc) to the power supply module (PSON pin) to the switch on the main 5vdc for the rest of the logic and Tuner circuits, 12~16vdc for the sound amplifiers (mostly Class D amplifier for efficiency and small size) and for the T-CON board (interface board between the LCD panel, some T-CON uses 5vdc, and the Logic board), and 24vdc for the Back lights inverter board (if there is no 24vdc then no back light).
Common failures:
Blown main AC fuse due to shorted out Diodes, transistors.
Bad capacitors leaking or bulging tops:
Shorted Diodes, transistors in the DC output side.

Testing the power supply output with dummy load:
24vdc testing: Disconnect the wires that go to the inverter board first. You can use two #1157 (using both Lo & Hi filaments by paralleling them at the base) car light bulbs connected in series so they can handle the 24vdc, this will put light load (about 70w) on the 24vdc output, the voltage out should be steady at 24vdc (+/-2v), if not, the power supply has regulation problem.
12vdc testing: disconnect the 12vdc TV load from the power supply board and attach one #1157 (using just the Hi filament), the 12vdc output should stay at 12v (+/-1v), if not, the power supply has regulation problem.

You should see the lamps go on when the TV power switch is ON and go OFF when the TV is powered OFF.

2) Main Logic board (It has Processor, Tuner, Sound Processor, Sources selector, Power amplifiers for speakers, interface port to the T-CON board for pictures).
This logic board sends out the turn on signals (3.3~5vdc) to turn on the rest of the Power supply module (Switched main 5vdc, 12~16vdc, and 24vdc), Inverter backlight ON (if no back light on command then there is no back lights),
Logic board supplies 5 or 12vdc to T-CON board B+ pin through switched transistor if T-CON board does not get the voltage from the logic board, you will get white/gray glowing screen without pictures.
Back lights Dimming (PWM) control signal.

3) Back lights Inverter board. Its job is to provide the drive voltage for the CCFL (Cold Cathode Fluorescent Lamp) to give white light for the screen.
This board is fed by the switched 24vdc (VBL) from the power supply module, it also get the Back lights on (BL on) control signal and the Dimming (Dim/PWM/) signal from the logic board. So for it to work, it needs 24vdc and the BL_ON signal.
Common failures:
Blown surface mounted fuses due to shorted transistors/ICs, Transformers.
Bad capacitors.

4) The T-CON (Timing Control or LCD controller) board (on the LCD panel assembly). It transfer the universal image signal of TTL and LVDS signal to specific TFT (Thin Film Transistor) LCD.
This is the interface board that talks to the Logic board and the LCD panel to produce pictures on the screen. White/gray glowing screen when it fails or not getting the voltage from the logic board (the 5 or 12vdc is supplied by switched transistor on the logic board). Notes: T-CON board is mounted under the metal cover shield.
Common failures:
Scrambled pictures, Lines, multiple pictures, color smears/blotches, rolling pictures after warm up.
Blown surface mounted fuse.
No pictures, very dark screen almost like there is no backlights.

5) LCD panel assembly to display pictures. The LCD pixels will block or unblock the back lights from the back of the panel to the front of the panel. This is the most expensive part of the TV, it will be more than the TV is worth.

As you can see, you must have all the above Voltages and signals for the TV to work properly. This may help you narrowing down the bad modules instead of buying the wrong module just to find out later that it did not solve the problem. Hope this will help you out.

Sound problem:
Let verify first to narrow down to where the problem can be. First, check the on screen sound set up menu to make sure the speakers are not set to OFF. If the setting is OK, then attach the powered PC speakers to the Audio Line out RCA jacks to see if you can get the sound there, if you do, then the problem can be in the power amp circuits, if you do not get the sound at RCA jacks, then the problem can be in the sound processor circuit. To get the sound repair, it can be from $150 and up, so if you can put up with using the good set of Powered PC speakers which actually give better sound than the tiny speakers inside the TV, I would keep using it that way, you may want to find out if the on screen sound setup will allow you to set the audio line out to be VARIABLE which means the sound output feeding the PC speakers can be varied using the TV remote control, then all you have to do is to set the PC volume to about half way up and set the TV volume to what ever you want.

Inverter board connector: you can also see the Fuse 4A/160V
Power supply connector:

T-CON board: (metal cover shielding is removed to show the bd.)
Inverter board:
Logic board:
T-CON board is dead, no power or blown fuse on the board, screen turns WHITE, must see it in darkened room, otherwise you may mistaken it for failed backlight.
Bad T-CON board after warm up, you get lines, multiple pictures, strange colors blotches, etc.
Bad caps (leaking/bulging tops). Make sure to replace bad cap with good cap such as PANASONIC FM or FC series , they are Low ESR (Equivalent Series Resistance) which is a must for switch mode power supply, and 105c rating. Do not use generic electrolytic caps.

Bad T-CON board or power supply problem


24vdc power supply output testing using two 12vdc car lamps in series.

Bad LCD panel, vertical 1~2 pixel wide lines
Failed TV and Monitors:

Free service manuals:

on Jan 05, 2011 | Sony BRAVIA KDL-40S2010 40 in. LCD...

1 Answer

Haier LCD picture goes dark, sound only

hi, since your TV is under warranty,It is better to ask for a replacement a new one ..the problem is factory defect.

Apr 02, 2012 | Haier HL15R LCD TV

2 Answers

Watching TV and it suddenly turns off just like if you had the remote and shut off the TV. We set in amazement for a few seconds and then we turned the TV back on. We had sound but no picture. It was a...

Tv turn on now,does it have a flashes of picture only a few second than dies and than have only sound left?Yes,than the tv 2 long LCD inverter boards are dead.These 2 long LCD inverter boards are one to the left one to the right both must be replace.The 2 long LCD inverter boards job are to help the LCD screen panel to have a backlight to produced a picture.Tries websites like, to buy those 2 LCD inverter boards for the replacement.

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I turn on my DYNEX LCD-TV model DX-L26-10A and the screen says 'Please Wait" for a few seconds and then I hear the voices for the channel, but there is no picture and there is a buzzing sound coming...

I turn on my DYNEX LCD-TV model DX-L26-10A and the screen says 'Please Wait" for a few seconds and then I hear the voices for the channel, but there is no picture and there is a buzzing sound coming from the back of the unit.

Nov 15, 2010 | Dynex 32 in. LCD Flat-Panel HDTV

1 Answer

I was watching TV and suddenly the screen went black. No picture, no sound. On/off timer LED on TV started blinking. I could not turn it on (or off) with remote or ON switch on TV. I found that if I...

The television is shutting itself off to protect itself. The blinking light is a code pattern. The specific code determines whether or not you need an LCD Controller Unit, Main Board, power supply or something else. You would need the service manual. There are parts distributors you can get it from and the parts as well. If soldering and tv repair is not something you are entirely familiar you may want to seek a tv repair person. The manufacturer's support may walk you through the service menus to complete a factory reset depending upon the symptoms.

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1 Answer

Dynex 32" tv picture goes black

If there is still about ? 24. Volts coming from the Power Board when it goes dark, it will be the Inverter board that needs replacing. If not, it is the Power Board that needs replacing. The Voltages should be written next to the sockets & plugs on the Power Board.

Jun 02, 2010 | Dynex 32 in. LCD Flat-Panel HDTV

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