Question about Sony KDL40EX400 40 in. HD-Ready TV

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My Sony kdl 40 ex 400 the picture is coming and going while the sound is constant

Th e picture is coming and going but the sound is constant.

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  • Sony Expert
  • 264 Answers

In most of the case, the problem is a LED back lights strip problem.

Posted on Oct 30, 2017

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Posted on Jan 02, 2017

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SOURCE: Sony Bravia KDL-40S2000 40 inch

We have the same problem.. Checked the Sony site after a few clicks got to: http://www.iq.sony.com/SRVS/CGI-BIN/WEBCGI.EXE/,/?St=966,E=0000000000761838071,K=1708,Sxi=1,Case=obj(460991),VARSET_OBJ=460991,VARSET_TSRC=results,UseTemplate=case.tem,VARSET_TOP=TRUE
We followed the 'simple' troubleshooting tips then called the service center. As mentioned above 4 blinks indicates a bad panel. The repairman that visited said that he is ordering a new power supply (much cheaper than the back panel) for their first try. I will post again when my set is back on.

Posted on Dec 22, 2007

  • 135 Answers

SOURCE: Sony Bravia KDL 40S20L1

You should have a 1 year warranty from Sony. Call them before it expires. This is probably a LCD panel issue.

Posted on Nov 10, 2008

vinnyq
  • 157 Answers

SOURCE: sony bravia kdl-52w3000, turn tv on, no picture or

Most likely this is caused by a defective main board. Changing the main board will fix the issue about 95% of the time.

To be absolutely sure, the voltages need to be checked on the power supply. If they are not the values listed in the service manual, then you should replace the power supply instead (accounts for the other 5% of the time).

Posted on Oct 07, 2009

tvhelp-Dave
  • 178 Answers

SOURCE: Bravia KDL-46VL130 TV: Our Sony KDL-46VL130 picture is streaking and some...

That symptom may cause by the main board or t-con board, I suggest you do software up grade first.

Posted on May 07, 2010

  • 1 Answer

SOURCE: sony bravia kdl 46s4100 no picture

it sounds like your back light might be going out. You might be able to fix this by installing a new backlight inverter board.

Posted on Aug 05, 2010

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If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
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It could be caused by a bad T-Con board or defective LCD panel. The panel is more expensive than the TV, so hope that it is the T-Con board. Below is a parts list for your TV model.

http://www.tristatemodule.com/t-Search.aspx?q=KDL-40S2010

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Does it do this with other input devices? Sounds like a electrical surge.

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Hello

on your set there is inverter board that is what lights up th backlight on your TV making everything visible that board has went bad.

Thankyou

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1 Answer

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