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No picture only sound and back light

All voltages check ok but Tcon reg not working

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Samsung LED UA40F6400 suddenly lost picture.


The tcon board or the LCD panel is faulty. You have to replace the TCON board to confim the fault.

If you wish to get some details; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/

Aug 06, 2016 | Samsung 40 Inch UA40F6400 Full HD 3D Smart...

1 Answer

I have sound but no picture. what could be wrong?


You should always check the voltages supplied by the power supply. A loss of power to the tcon board will prevent it from working properly.

Dec 29, 2015 | Televison & Video

1 Answer

Samsung LCD TV 22inc Model No LA22A450C1, no picture ( white screen) only sound....


This type of failure is related to a defective Tcon board. I would suggest if you are DIY to check for proper connections from the main board to the Tcon board, if all the connections are good.. check for proper voltage from the power supply to the Tcon board. If all the previous checks are good, check for an open fuse on Tcon board.
Let me know if you require further assistance.

Oct 03, 2015 | Samsung Televison & Video

1 Answer

70in vizio has no picture but has sound. I replaced the tcon board and the picture came back for about 5 seconds but faded out. Is the tcon board bad again?


Back - light problem. 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.

Sep 02, 2015 | Vizio Televison & Video

1 Answer

Westinghouse ltv-46w1hd has a black screen but has sound


If you have the back lights on but no picture.. the failure is in the Tcon board. I would suggest to measure the fuse in the Tcon board labelled as CP1 or check for 12 volts on one side of the fuse (VIN) and then on the other side. If the voltage is absent on the IN test point, that means the fuse is open.
If troubleshooting at the component level is difficult, I would suggest to replace the Tcon board.
Let me know if you need further assistance.

Sep 01, 2015 | Westinghouse Televison & Video

1 Answer

IPhilips 55in lcd 47pfl3603/f7 is the sn, TV turns on no picture the sound works, what i found is talk about a invertor board but all I find is a tcon board what I'm wondering is the tcon my problem


Back - light problem. 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 | Televison & Video

2 Answers

LG 42LG5 TURN ON TV PICTURE GOES BLACK


This could be 1 of a few things here. Without opening up your set and trying to look at voltages or indiciator lights I couldn't tell you exactly without some more info.

Without looking at it myself here are my thoughts and where I would first look at.

It may be a main board because:
1) Main board processes all your audio/video signals. Bad main board means bad video processing. Could do that. Especially if the main board is not sending the right signal or a bad signal to the rest of the boards so they don't do their jobs. 

It may be a power supply because:
1) Power supply is well, the power supply. If it's sending inadaquete voltage to the main board you may not be recieving enough juice to keep that main board doing your video processing or further up the line keeping enough juice flowing to your TCon board to keep it telling things where to go and what to do. The power supply sends voltages to your Ballast board(controls your lights) and to your main board through which power is supplied to your TCon board via a LVDS line and a +12/+16V signals. If the power supply isn't pumping out enough juice to keep the TCon or Main Board running, it could be a problem. By the same token it could be that your P/S isn't sending power out to your ballast board. 

It could be a TCon because:
1) If the TCon is bad, you won't get your pictures. This could be the TCon board itself or the LVDS cable from your TCon to your Main. However, with few exceptions, if it's a bad TCon you're looking at a total panel replacement. 

It could be a ballast board because:
1) The Ballast Board controls the lighting behind the LCD screen. If this isn't working right you won't be seeing much of anything without that back lighting. If this is bad, it's a panel replacement. These are not field replaceable items by LG. 

Based on the symptoms, without more data or a eyes-on view of it, I would say you're most likely looking at a Main Brd or PSU problem. 

Feb 12, 2009 | LG 42LC2D 42 in. LCD HDTV

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