On Sony Bravia KDL-S40A12U screen occasionally turns black for a couple of seconds. Only happens on the HDMI channel. Sound still works, but no picture?

Try changing input to come in through the S-VIDEO or RGB ports to see if it's HD problem or screen itself

hi chek the botton - of the volume maybe it is pressed

Usually this happens to my set when I am in HD cable channel mode after being on a non-digital ANALOG channel.

I basically reset the TV by changing to a DIGITAL cable channel -- stay on that channel for ten-twenty seconds -- then I switch back DIRECTLY to a HD channel (key in channel number directly on remote).

TV works fine -- seems to be a glitch when the TV changes modes from Analog to HD

You either have failed 24vdc power supply section or failed backlight inverter board, check for 24vdc first, look for caps with leaking/bulging top.
Parts: http://www.shopjimmy.com/catalogsearch/result/?q=Sony+BRAVIA+KDL+-V40XBR1+

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http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

It is On-Screen Display. Press Info " i " button on TV remote so on-screen display will disappear.
Thanks.

Yes it sounds like a lemon. A firmware update is the next thing to try.

this can be a weak signal check the connections on cables. also in hot weather you can get a build up of static electricity and it will need to be discharged, turn off tv at mains and cross the connector and the cables if you have a buster or other box connected to them turn off and do the same to them. use something metal but make sure there is no power to them.

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

Sounds like a handshake problem with the HDMI outputs on the devices. I have never seen BOTH HDMI inputs have the problem. It could be a problem in the TV where the HDMI signal is processed or the HDMI jacks may have been stressed and this is why you have an intermittent problem. By stressed I mean that the jacks have been bent by inserting the cables wrong or pulling up or down on the cables when they were plugged into the unit.

40X2000, both PS3 and DVD player are using a HDMI input and both flicker and loose signal fully, have to turn TV of then back on to get signal back. Sony say they have never heard this problem and replaced board. NOTHING fixed, still same problem.