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(8) NTSC channel no picture
Check if pin13 of N104
outputs signals?
Yes
Check the periphery circuit
from XC02 to N801
(9) ATSC channel no picture
Check if the crystal of
N228 (20MHz) is normal?
Yes
Check the clock signal of
each pin of XC01
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
Check if pin6/7 of TUNER226
output signals?
Yes
No
Check G226, N228 and
periphery circuit
No
Check TUNER226 power supply
and the peripheral circuit.
Check
N104
and
periphery circuit
No
Check TUNER226 power supply
and the peripheral circuit.
37
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