What can cause the sony bravia to switch on then off immediately.

If it is PLASMA TV.....
brandon barnes mentions..there is usually nothing physically wrong with 6 blink tvs..you need to reset the TV using the original remote

Not sure if the fix mentioned below is appropriate for your TV Sony eSupport Electronics Drivers Software

Fault with main board. Damaged component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

The power surge from lightening can come in thru the antenna or cable box. Also just the proximity of lightening can damage one item and not another. An ic chip can be destroyed from the charge in the air.Likely took out power and main brd both.

i think this is a problem with power supply

replace control board

Here is a link to the service manual--

http://www.scribd.com/doc/46056922/KLV-23S200A-and-Other

Page 11 explains the error codes--unless you are a tech with a meter etc it will be a shop repair.

A lot of good info including taking set apart correctly.

"abnormal power"

SD TECH

sony bravia klv v40 schakelt op willekeurige sijden ove rop slaapstand. lampje knippert dan 8x en vervolgens 4 sec. puaze en op nieuw knipperen.