Newbie trying to fix old TV/Monitor

I have an old TV/Monitor Sony Bravia whose screen + audio are dead:

Sony BRAVIA® LCD 32"

Model: KDL-32EX405/1

Year: 2010

Service Manual: https://www.manualslib.com/manual/330501...

Neither the standby + power LEDs show any error (ie: not blinking) and both appear to be working ok.

I've already tried to point a flashlight on the screen, open some OSD (ex: volume, channel, setup), and look for any pixel activity. Unfortunately, I could not see any pixel activity.

I'm considering trying to repair it myself since the technical assistance declined. However I'm not a technician and I have only elementary knowledge of electronics. Therefore, I'm looking for some advice:

• Where should I start?

• Any guess what might be the issue?

• How difficult should this repair be?