The old standby for almost all Sony sets is with the set off:
(remote control-Sony)
Display, 5, Volume up, power
With set then on the display should show the tech menu
Press 8 and (set will display or should RESET in red, then press enter and it should (reset) turn green---this has been the standard reset on their set for several decades.
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..."
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