XOCECO PH-50FB31, Service Manual, Page: 35 / 50

33
(7) TV channel no picture
(8) DVB-T channel no picture
Note :
The I2C bus line control of TUNER is switch through the bus line of N242, so after checking the
power supply and peripheral circuit of TUNER241, it is still no picture in TV and DVB-T channel,
please check N242 emphatically.
Check if pin12 of TUNER241
output signals?
Yes
No
Yes
No
Check if pin13 of N103
outputs signals? Check TUNER241 power supply
and the peripheral circuit.
Check the periphery circuit
from XC02 to N801 Check N103 and its
periphery circuit
Check if pin7/8 of TUNER241
output signals?
Yes
No
Yes
No
Check if the crystal of
N242 (4MHz) is normal? Check TUNER241 power supply
and the peripheral circuit.
Check the clock signal of
the front 4 pins of XC01 Check G241, N242 and
periphery circuit