Sony KDL-52W5500 No HDMI Picture or sound

Hi all,

My Sony KDL-52W5500 HDMI ports (all 4) stopped working. The tv can sense when a cable is connected (a little symbol appears when switching sources), but no picture or sound is coming through. I have:

- Tried different cables

- Tried different hdmi-sources

- Factory reset

- Unplugged the tv from the mains (worked for someone)

- Basically every suggestion I could find online.

My question would be: if i were to change the board on the tv, which board would be the most likely one?

Power board? Main board? Any suggestions?