XOCECO LC-27FB18, Руководство по обслуживанию

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(8) NTSC channel no picture
(9) ATSC channel no picture
Note :
The I2C bus line control of TUNER is switch through the bus line of N228, so after checking the power
supply and peripheral circuit of TUNER226, it is still no picture in NTSC and ATSC channel, please
check N228 emphatically.
Check if pin11 of TUNER226
output signals?
Yes
No
Yes
No
Check if pin13 of N104
outputs signals? Check TUNER226 power supply
and the peripheral circuit.
Check the periphery circuit
from XC02 to N801 Check N104 and its
periphery circuit
Check if pin6/7 of TUNER226
output signals?
Yes
No
Yes
No
Check if the crystal of
N228 (20MHz) is normal? Check TUNER226 power supply
and the peripheral circuit.
Check the clock signal of
each pin of XC01 Check G226, N228 and
periphery circuit