On page 21
Hdmi ports and vga port, you see clearly an 8 pins eeprom chip near the plugs, i still think its the edid like FZABKAR said (google search edid), simply put the edid defines tv resolutions / frequencies / screen size ...
I dont think its the main board nand you can reprogram via the vga or hdmi ports
The nand is ic4701 on page 26
On page 27 you have at least two programming ports, cn4103 and cn4101 and a eeprom ic4102.
I dont think you will be easily able to recover your tv, or something went wrong in the power supply, as usual check all voltages lines, and the power led if you see some errors codes blinks, you have a section for that in the service manual.
Or maybe try a new search in tv's forums to flash recover your tv ??
And as a last resort, find a new mainboard ?
EDIT Im native french (On one french site, 2015 threads) they say you have to upload a new firmware thru the rs232 port, to talk to the mips controller and do that in xmodem mode, it seems you need some special tool to do that.
And i did found out this link (not in english)
http://download.portalmrelectronico.com/centro_privado/user_uploads/egranadaade1/comoreprogramarlamemoriaflashdelostvsonyconchasisex2ncuandoeltvestbloqueado.pdfOh RE-EDIT Sony EX-2N chassis flash problem, Sony bulletin 12TV026.
Sony Bravia LCD TV with chassis EX-2N. This is the model list:
KDL-37S5500
KDL-40S5500
KDL-37P5500
KDL-40P5500
KDL-32S5600KDL-37S5600
KDL-40S5600
KDL-32P5600
KDL-37P5600
KDL-40P5600
KDL-32P3600
KDL-37P3600
KDL-40P3600
The symptom is : plug the TV, it goes to green LED, nothing happens on screen, and after about 30-35 seconds, a relay double-clicks and the cycle starts again, forever.
This problem occurrence peaked on 2012, and it was supposed to happen due to firmware bug triggered by a specific DVBt emission.
Good news are that if your TV is one of listed above and it shows described symtom, it has good chances of being repaired without even opening the TV, by just applying steps described in Sony bulletin 12TV026. Bad news are that you’ll need
Sony TL3 proprietary jig,
which is not available for sale. Then, there’s no other choice than replace NAND Flash with one properly programmed for required model (IC4701).
Since the jig is unobtanium ... you need the firmware, desolder the nand chip, reprogramm it, an do prayers
