Sony KDL-37M4000

[fcisolutions]

Have this Sony 37" television. Getting a light blue screen and nothing else. Thinking it could be the main board but wanted to get some advice. Tested T-Con and PSB and both good. Cannot get any buttons to work except for power button. No volume, menu, or input button control.

[attainteddragon]

Re: Sony KDL-37M4000

disconnect one ribbon cable from the t-con and see if you get half a pic, then try the other half.
this is where scoping the lvds would let you know if the t-con is getting a signal or not.
is the t-con fuse good?

[Davi.p]

Re: Sony KDL-37M4000

Almost surely bad mainboard, probably bad flash or bad main software.
Check a service manual for the existence of a firmware recovery and reflash method by usb key if present or a method through serial port.

[attainteddragon]

Re: Sony KDL-37M4000

i need more coffee i think. yeah, looks like eeprom if buttons are working but no change in status. though is power on/off working?

[Davi.p]

Re: Sony KDL-37M4000

Yeah you need more coffe:

is power on/off working?

it is written on the 2 little rows of text :-)

[attainteddragon]

Re: Sony KDL-37M4000

just need conformation that it powers off as well as on.

[Andrew F. Ali]

Re: Sony KDL-37M4000

The light blue screen tells us the backlights and the PSU is OK. Since the buttons are not working it is most likely a Main Bd. issue. As suggested before it may be an eeprom/software issue on the Main Bd. What is the Main Bd. Part No.??

[fcisolutions]

Re: Sony KDL-37M4000

Yes I can power the tv on and off. I figured it was probably the eprm on the mb.

[Davi.p]

Re: Sony KDL-37M4000

No the eeprom no, cause a wrong panel setup ususally end in bad video not black but on top of all, remote and keyboard are not programmable so them must work.