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Hi , I`m Jack Perhaps I can help you with this problem , please send me a reply when you see this ?
What is this external feed ?
A sound system , sound bar etc. ?
O.k but you did try to connect something to the line out .
What i`m getting at is that if there is no sound at the tv then perhaps it could be taken at the cable box for example instead of spending money or main boards for this tv
See plenty of olevia
which main board do you have , the SC0-P705201-000 or SC0-P508201GSI0
how much did you pay for that replacement and is it the exact replacement ?
There are 2 versions
Let me check for the manual
o.k then you do get something coming up .
No way to select an input and check for sound either I would guess ?
No manual for this .
If you can return that defective board then I would and if not then you could try to start and swap parts in the audio circuit assuming the audio works on the other board but if you have no sound at the preamp level then its pretty far into the circuit and you could end up killing your other board .
That versions sells for some $300 at some website I just saw !
You could get yourself a surround sound for that price and connect everything there .
At this point its either another main board or sound system or sound bar with multiple inputs
I`d be surprised the audio circuit has its own power feed , it could be a power issue but on the main board where the feed (B+) gets sub-divided into feeds for various circuits
If you have an antenna there is still an alternative though
External tuner that records and comes with its own remote ;
Has HDMI and analog audio out
I understand ,
Would be difficult for me to help you from where I`m sitting though without some sort of schematic or at least block diagram .
All I can do is offer alternatives at this point as this main board is definitely MIA
Again , I would re-install the old board , get refunded for the defective main board and go for the alternative
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