Belson BSV-2751, Service Manual

Page: 26 / 45

2
4
No picture in sub-screen :
yes no
Yes no Yes No
yes no
d). No picture in SCART1 channel
yes no
Check if 12
th
pin of TUNER202
on TV board has signal output
Check if line/field syn. signal
and clock signal output from
N401are normal
Check if
line/field syn.
signal and
clock signal
output from
N101 are
normal
Check
peripheral
circuit of N401,
crystal
oscillation,
power supply
Check if 73
rd
pin of N401
has signal input
Check the
circuit from
TUNER202
N401
Check
peripheral
circuit of
N601, power
supply N601
Check peripheral
circuit of N101,
crystal oscillation
Check peripheral circuit of
TUNER20 , power supply
and bus line.
Check if 4th,5
th
, 6
th
and 74
th
of
N401has signal input
Trouble in
channel from
SCART1 socket
to N401
Check if the 46
th
pin of N501 is of low
electric level when SCART1 has RGB
input and if it is of high level when the
latter is video input