14 Dec
2011
14 Dec
'11
2 p.m.
Yes, I understood the panoply of standards, and
certainly the TV companies do, too.
It's perfectly possible they ship a TV that can handle the standards of a
few countries. After all, the frequencies aren't that different, and
the decoding is largely done in software these days. Inside your average
CD TV today are two boards, one the power supply, another whose chips
look pretty much like a PC motherboard.
Indeed.
Amazingly the service manual for our LCD TV doesn't contain a schematic
of the PSU board (it's unclear why not, one page says for 'safety reasosn
the pSU must not be field-repaired', another page says that the PSU is a
bought-in module, and no schematics are available), but you are expected
to repair the signal PCB to component levbel armed only with a schematic
(no real signal information is given). And IIRC at least one of the ICs
is a BGA pacakge. Not fun...
-tony