Question about Samsung LN40A550 LCD TV

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I have a samsung lcd tv that powers on has sound but the picture is fuzzy and has no colour . What would be the component that needs replacing for this ??

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  • Expert
  • 83 Answers

Hello. Before you start replacing parts, make sure your connections are correct. It sounds like you have connected a composite source to a component input. Composite is three RCA plugs, a yellow for all of the video, and a red and white for audio left and right channels. Component is five RCA cables, green, red and blue for video, and red and white for audio. if composite is connected to a component input, the picture will be black and white with squiggly lines all through it.

Posted on Apr 01, 2015

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  • Samsung Master
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Hi Israel,
With fuzzy picture please open the menu. If the menu is normal, the Tcon and LCD panel are ok and there is every possibility of the fault being due to bad main board. If the menu is also affected, look into the Tcon board and the panel. First the Tcon board. And before doing all this please check the connectors between main board and Tcon and Good luck.

Posted on Apr 01, 2015

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Posted on Jan 02, 2017

moto34
  • 155 Answers

SOURCE: Samsung LCD Tv

Try this:
Access menu service by press on your command, with your TV OFF:

INFO + MENU + MUTE + POWER ON

Then you should get access to Service Menu.

The last item says: RESET

This will do a reset to the TV.

Make no harm.

WARNING: If when on service menu you feel tempted to "screw" on anything FIRST take note on ALL you change! You can compromise the TV ...

Posted on May 03, 2008

  • 2 Answers

SOURCE: Samsung LTN1765 has blinking green power indicator, but no picture or sound

Try replacing C51, a 10 microfarad 16v. surface mount electrolytic. It's near IC23 on the upper center of the board.
This part had high ESR on a couple of sets I serviced which
kept the power supply from starting.

Posted on May 10, 2008

  • 718 Answers

SOURCE: how hard it is to replace by yourself main board Samsung LN-T4065

You need to do some more diagnosing of the problem. If you get sound and change channels take a bright flashlight and place it again the screen. Look for an image around the edge of the flashlight.
If you see an image that means the LCD controller board (TCON) is probably good.

The problem is probably one of three causes;
1) Inverter board is bad
2) CCFT (cold cathode fluorescent light) are bad.
3) Power to the inverter board is bad. You can also check the connectors.

Posted on Mar 30, 2009

  • 26 Answers

SOURCE: samsung LN32A330J1N LCD T.V has no picture when powered on

I have a LN32A330 with a cracked screen. I can sell you boards tha you may need or maybe i can purchase your non working set.
Please email me, tracy_tangen@hotmail.com. You may need your power supply repaired. I am able to repair it for you if needed.

Posted on Jan 27, 2010

jrweighing
  • 183 Answers

SOURCE: I have coloured vertical lines on my 40-inch

is the screen full of vertical lines? It sounds like your Tcon has gone faulty but...there is hope. Firstly, only if you are competent with electrics follow the procedure bleow, else get a qualified tv engineer to inspect your tv.
Remove the back cover on the tv.Looking in from behind, check the power supply which is the board connected to the mains power lead. Check the capacitors, making sure none of them have bulging tops.These are the components shown below.
2e1ea71.jpg
The caps shown below are an example of faulty caps, with their tops bulging.
3b76c83.jpg
This model of tv is prone to this condition, and if you have any bulging topped caps, replace them.
Next check the Tcon LVDS lead connection. The Tcon is the board located top centre of the screen and is enclosed in a metal plate.It has a lead connected to it that goes to the main board. Clean the connector at the Tcon.Be very careful though because the connection is fragile. It can be removed by gently squeezing in either end of the connector and gently pulling outwards.If these procedures are not successful, replace the Tcon.

Posted on Mar 07, 2010

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