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(6) NTSC channel no picture
(7) 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 pin4 of TUN1 output
signals?
Yes
No
Yes
Check if CB154 outputs
signals?
Check TUN1 power supply and
the peripheral circuit.
Check N100 and its
periphery circuit
Check if pin20/21 of TUN1
output signals?
Yes
No
Yes
No
Check if the crystal is
normal? If output signal?
Check TUN1 power supply and
the peripheral circuit.
Check socket N100 and the
periphery.
Check the crystal and
periphery circuit.
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