Sony kps 4112u need help please

[sonyinneed]

hi all new here so hope someone can help me here as iam losing my hair over this one
i have a sony kps4112 with no start up with this error code standby light on, then a-b-a,
one flash of a,
one flash of b,
then one flash of a again,
anybody got any ideas please .

[sonyinneed]

helpppppppppp

[sonyinneed]

hi tv now running after replacing 2sc2555 Q801 on n board, now we have rgb colour and sound but no picture and the standby light flashs after a few seconds and no brightness, i have checked for relivent dry joints as listed in repair tips and in general, so any advice would be a help as i've not had much help on this yet and my kids are driving us mad not having the tv please help.