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display turns off after a few seconds of powering up, but sound it ok

display turns off after a few seconds of powering up, but sound it ok

couple of days ago while watching tv, with my laptop connected via HDMI, the display went black but sound remained working. Now when I power on my TV, without any external device connected, the display comes up for a couple of seconds before fading away to no display at all. While the display is fading away, I can see some colored verticle lines and then the screen goes black. Model is kdl48w705c. Please help

ANSWERS:

"Hi @stafforduk,

Here’s an image of the no picture troubleshooting flowchart taken from p.72 of the service manual which may help.

(click on image to enlarge)

On p.11 is the starting point for all the voltage checks on the BAX-L board (B board - power board for your model) which may be useful to check if they’re all OK or if one is missing etc."

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