I have a bravia KDL-26S300 and the screen when watching all chanells goes off and on every 20 seconds and then returns on .... what is the problem ? controller? NO comMands will work on the TV itself or the remote. It is a 07'- i EVEN TRIED TO SET BACK TO FACTORY DEFULT BUT no luck ??? thank you

SOURCE: clicking noise sony bravia kdl-40v3000

It is most likely the cabinet setteling as it is cooling off. Nothing uncommon with all the plastic that is used in TV's.

SOURCE: How to do a complete factory reset of a Sony Bravia KDL-32P3000

Just talked with Sony Support today.

It seems that Sony in Denmark had sent out new software updates (over DVB-T) but also some wrong TV's got updated as well. This caused my DVB-T tuner to not function anymore so I wanted to try a factory reset and it fixed my problem.

So I was instructed on how to do this. I have a Sony Bravia KDL-32P3000 (which should be similar to the U3000 and S3000 as well).

This is how to do a factory reset of your Sony Bravia KDL-32 P/U/S-3000 TV.

PLEASE BE VERY CAREFUL WITH THE SERVICE MENU, YOU CAN EASILY CAUSE YOUR TV TO MAL-FUNCTION!!!! IF YOU FOLLOW THIS GUIDE IT IS AT YOUR OWN RISK!!!

Set your TV in standy (use the green power butten on your remote), RED standby LED is ON on your TV.

Now press these buttons in this order on your remote (pointing to the TV).
i+
5
VOL UP (+)
GREEN POWER button

NOW BE CAREFUL! Dont press any keys just for the fun of it!!! IT MAY DESTROY YOUR TV.
You should now be in the service menu. It will show up as some green letter/numbers spread over the screen (mine are a bit hard to see/a bit faded). In the upper right corner you should have 2 letters TT (two t's).

Now carefully press key 0 and then key 8 on your remote (they should be shown on the screen after the two TT).

Now wait a little while (more than 10 seconds) and your TV should reset with factory settings, just as if you had just brought it home from the TV store.

Best wishes,
Mads

SOURCE: How do I reset a Somy bravia KDL-52W4100 back to

While holding down the UP arrow key, press the power button. The TV will turn off and back on and reset to factory default settings. Hope this helps

SOURCE: My Bravia KDL-40S4100 lost all 3 of it's HDMI

There is a problem with the processor. The only way to resolve this issue is to replace the main board. It is called the A board in your TV.

There are two for this model and the correct one will depend on what your serial number is.

Part numbers are as follows:
part # 185709211 for Serial #
1,000,001 - 1,350,000
1,700,001 - 1,750,000
1,800,001 - 1,804,270
1,804,271 - 1,818,372
1,818,373 - 1,830,000
list price: $504.87 core charge: $680.00

part # 185709231 for all other serial numbers
list price: $505.87 core charge: $600.00

Testimonial: "Thanks, Now I wonder who all shares the same problem and if Sony is willing to do something about their defective products..."

SOURCE: i have a kdL-32L4000 bravia tv that just started

The T-con board or LVDS cable fails, may be bad connection. You can try to reseat them first.
There are some pictures for reference http://tvhelp4u.spaces.live.com/default.aspx