I have a customer's Sony Bravia KDL-40M4000. (Manufactured 2008)
When powered up, the green power LED lights, backlight comes on, the word "Bravia" appears in white on a black screen, then just stays there forever. No menu, no options to get past the splash screen, chassis buttons (Vol, Chn, etc.) do nothing.
The only button that appears to function is the power button itself. (And it's a little flaky as well - I believe the power switch may just be dirty - It feels like it "bounces" when depressed and the TV will often power on then immediately off again on removing your finger from the button. Pressing it more firmly seems to allow it to stay on)
I assume the failure to move past the Bravia boot logo would indicate a Main board issue, as that's where all the logic resides... BUT - Before I go ordering a replacement Main board, anyone else have any experience with this issue? ("Bravia" boot logo splash screen never disappearing). Anything on the power board that could cause that symptom?
It's not a TCon problem and it *seems* like the power board should be ok because it is powering up, backlights working, logo displayed, etc. It just doesn't want to continue past the logo. As far as I can determine, the only "Factory Reset" available on this model must be done via the remote and on-screen menus - Not an option because I can't get past the Bravia logo to GET to a OSD.
I've been a qualified electronics technician for 30 years, I have a full commercial shop & all the necessary test equipment. It's the first time I've encountered this particular issue and have had no luck at all Googling the problem.
Any suggestions/tips/tricks/experience from those more familiar with Sony TVs would be gratefully accepted.
When powered up, the green power LED lights, backlight comes on, the word "Bravia" appears in white on a black screen, then just stays there forever. No menu, no options to get past the splash screen, chassis buttons (Vol, Chn, etc.) do nothing.
The only button that appears to function is the power button itself. (And it's a little flaky as well - I believe the power switch may just be dirty - It feels like it "bounces" when depressed and the TV will often power on then immediately off again on removing your finger from the button. Pressing it more firmly seems to allow it to stay on)
I assume the failure to move past the Bravia boot logo would indicate a Main board issue, as that's where all the logic resides... BUT - Before I go ordering a replacement Main board, anyone else have any experience with this issue? ("Bravia" boot logo splash screen never disappearing). Anything on the power board that could cause that symptom?
It's not a TCon problem and it *seems* like the power board should be ok because it is powering up, backlights working, logo displayed, etc. It just doesn't want to continue past the logo. As far as I can determine, the only "Factory Reset" available on this model must be done via the remote and on-screen menus - Not an option because I can't get past the Bravia logo to GET to a OSD.
I've been a qualified electronics technician for 30 years, I have a full commercial shop & all the necessary test equipment. It's the first time I've encountered this particular issue and have had no luck at all Googling the problem.
Any suggestions/tips/tricks/experience from those more familiar with Sony TVs would be gratefully accepted.
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