820-3547 no gong no video

[macitech]

I have a 820-3547 EMC 2674 15" MacBook Pro 2012 not booting MOST of time.Sometimes machine will gong and boot but rarely. When it does gong reset smc and pram 4 times.
Fans spin no gong no video.
I suspect failing GPU. Is there anything I should check before calling this one not repairable?
I understand that a recall on this machine is expired?
Thanks

 

[dukefawks]

820-3547 is an IO board....Is this a 820-3332? If so U8900, read the sticky on it.

 

[macitech]

15" 1398 etc 2674 i7 2ghz Sorry 820-3662 Late 2013
Searched for U8900 couldn't find on board view.