XOCECO LC-27W18S Service Manual - page 31
29
Yes No
c), TV channel with no picture
Firstly find out which frame fails to work properly making use of the PIP function, PIP frame or Main
frame.
Main frame with no picture:
Yes No
Yes
No
PIP frame with no picture:
Yes No
Check if pin 12 of
TUNER201 has input signal
Check if C163 has input signal
Check the
circuit between
TUNER201 and
N101
Check periphery
circuit of
TUNER201, power
supply circuit and
bus
Check if pin 12 of TUNER202 has
output signal
Check if the horizontal and vertical
synchronous signal , clock signal
outputted from N601 are normal or not
Check if pin 16 of N601 has input
signal
There exits problems at the
place from socket of S terminal
to N506
Check periphery circuit of
N506 and power supply circuit
Check periphery circuit of N101,
crystal oscillation and power
supply circuit