Sony Bravia XBR 55X900E cycling through test patterns: which board(s) to replace?

[patricksurry]

We had a power outage but TV seemed to be working fine afterward. This morning it showed a "grainy" picture, and then next time we turned it on it's stuck in a test-pattern loop. None of the resets I've tried have any effect, including unplug/wait/plug in - it immediately goes into this cycling test pattern.

Does this suggest the main board needs replaced? The TV is about 5 years old, picture still looks great (tho limiting to crisp red/green/blue/white lacks some variety

[nomoresonys]

Re: Sony Bravia XBR 55X900E cycling through test patterns: which board(s) to replace?

Try a firmware update/pair thru usb, try to use a thumb drive of 4gb or less.

[Davi.p]

Re: Sony Bravia XBR 55X900E cycling through test patterns: which board(s) to replace?

When changing air tv channels have you got any sound? My first doubt is bad main board, there is a lack of video signal through lvds cable, if you have oscilloscope you can check, you can also try a checking with multimeter, if you change mb you must do a pairing by usb update