Sony XBR-55X850D Service Manual page 49

FLOW
4-4. NO PICTURE (@ TUNER)
RF input no picture / noisy picture
Check RF source cable
and antenna, OK?
OK
Check Tuner power line:
3.3V at JL6005 = 3.3V?
1.8V at JL6006 = 1.8V?
DEM_3.3V at JL6019 = 3.3V?
A_RESET value at JL6012 = 3.3V?
For JP_SK only – TU1.1 V (Refer notes)
OK
All broadcasting channel
cannot be received?
NO
Analog
Refer Analog Tuning
XBR-55X850D/855D/857D, 65X850D/855D/857D, 75X850D/855D/857D
NG
NG
Check part mounting condition
for "I2C_A_SDA, I2C_A_SCL
YES
or
I2C_D_SDA, I2C_D_SCL"
Refer Note I2C
OK
Digital
Terrestrial/Cable
For TW & NA-ATSC
(MX/UC) only
Refer Digital Tuning 1
Change RF cable and antenna
Please refer DDCON
troubleshooting
NG
Change NG parts
connected to I2C bus
Satellite
NG
Check Tuner power line
12V at JL6027 = 12V?
OK
All tuners except
TW & NA-ATSC(MX/UC)
Refer Digital Tuning 2
TROUBLE SHOOTING
Note:
I2C line for all tuners except Japan_SKP
- Parts for I2C_A_SDA line: R6001, C6004.
- Parts for I2C_A_SCL line: R6002, C6005.
I2C line for Japan_SKP
- Parts for I2C_D_SDA line: R6003,C6006
- Parts for I2C_D_SCL line: R6004,C6007
TU_1.1V line only in Japan_SKP Tuner
- Parts for TU_1.1V: FB6800
12V LNB Voltage
Checking
49