XOCECO PS42K8, Service Manual

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20
4) TV no picture
normal no picture
normal abnormal
normal abnormal
.
normal normal abnormal normal abnormal
normal
Take out dual picture and set the other picture
to TV, to see if this picture is normal.
Input an AV signal to see if AV
channel is normal
Check power supply for
TUNER1, bus line and
video output circuit.
Check output signal of
N102(line/field
synchronous, clk, PEN etc.)
N204 and its
peripheral
circuits
have
Peripheral circuits
of N501 V PORT
have problem
Input an AV signal to see if
the AV of dual picture is
normal.
If input VGAsignal is
normal
If voltage of N702
is normal
Input circuit of
N102 or
interface has
problem
Check if output signals
of N204(line/field
synch. CLK, PEN)are
normal
Check
N102and its
peripheral
TUNER
Check in the
sequence of
2
If the connection
between boards is
reliable