65UH5500 - Turns on, Turns off, 3 Red Led Blinks - Power Module Gone

From browsing repair forums I’ve seen this issue is quite common and can be brought on by a flurry of sources.

I however think I might be lucky in my bad luck. I’ve taken the back panel apart and upon close inspection, there seems to be a VERY likely culprit. My question however for the more experienced peeps in here is if this issue is likely to be the cause of my problem or a side effect of another problem.

On the power module (or Power Modle as written on the thing … ), one of the parts seems to have overheated (marked BCK-50-L04050, in the bottom middle rightish section of the board).

Wondering if:

1) Only that part can be replaced -tried a google search to no avail - what is that part called btw.

2) Can something else cause this issue that would render the power module replacement trivial.

3) Anyone has a link to access the service manual for this TV.

Thanks a lot in advance for your insights,

Nik

Additional pictures:

The rest of the power board up close:

A wide pic of the whole back of the TV for perspective:

The other two boards (that seem to be fine):