Dont think I ever worked on one & I know I wont
have a manual. Start by finding the STBY ( standby )
power supply. Should be a small one that gives +5 V & 12 V.
Some are on a separate board & some keep all running
& turn the hoz osc on/off for on/off. Sonys are well marked
so you can usually find the micro marked at VCC, RST etc
to see if its getting 5V.
May also use the same as the wide screens with the
2 IC's, one is STBY & other 130 V.
BTW if the main fuse is blown violently it may be a
lightning hit. If so probably a total loss.
73 Zeno