Question about Sony BRAVIA KDL-52W4100 52 in. LCD HDTV

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Sony sometimes goes black screen on channel switch!

Since last week I have got a problem with my Sony KDL-40W5710. (I bought the Sony 5 month ago.) When I'm swithing channels the picture and sound sometimes disappears. Screen goes black. Only the channelbar is left saying No signal. At that state all coded channels are black. I have to "boot" the TV to get back the picture and sound.
I use Conax CA module.

The "funny" part is that I went back to the store where I bought the CA module and there was another Sony customer with the same exact same issue. His problem also started last week..and we both have the same supplier of channels. (I do not have automatic updates enabled on my Sony.)

I have the firmware 1.303EA and is aware about the 1.600EA.
Is to chicken though since I read about someone that lost channels after update.

Signal strength looks Ok 100%.
QMA changing between -50 to -75 (have not seen this before ,use to be stable)

Can something incoming from the cable net cause this issue?

Any idéas?

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  • Sony Master
  • 73,619 Answers

The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

Posted on Mar 06, 2017

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circuitcity
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SOURCE: Sony BRAVIA KDL46S2010 Sound and Pix not in sync - in HDTV channels only

This is a software issue with both the TV manufacture and the cable box provider. This will only be fixed when the cable company and TV manufacture sit down and work out their problem. Some cable company has taken the first step by updating cable boxes with different software.

Best regards
CircuitCity

Posted on Dec 07, 2007

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SOURCE: Sony Bravia KDL-40v3000

NISK-TRY USING YOUR DIRECTTV MENU AND LOOK AT THE SCREEN FORMAT SETTINGS AND MAKE SURE YOU ARE AT 16X9 SETTING.JOETV

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SOURCE: Sony Bravia KDL 46V100 has only black & white picture-no color

check commponet cables, if not call sony still in 1 yr warranty

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SOURCE: Sony PFM 42V1, when connected with DVI, picture

it may cause by resolution mismatching, read the manual to find correct resolution needed. I have a service manual, if you want I can send it.

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SOURCE: my sony bravia digital channels always drop out of

For tuner problems, especially the digital channels, you should check for a TV firmware update at www.sonystyle.com. I was having some strange loss of digital channels on our 40" Bravia, starting with channels only appearing for a second before the screen produced a 'No Signal' message. After we tried the automatic retuning, then we could not even get the one second signal. None of this appeared on the description of the download. However, we downloaded the patch to our PC, loaded the file (19 MB) onto a small flash drive, which we then used to upgrade the firmware in the TV. All our digital tuner problems disappeared!!

Posted on Nov 28, 2009

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