Sony KD-43X85K Service Manual page 64

TROUBLESHOOTING
4.4 No Picture at Tuner
RF input no picture / noisy picture
Check RF source cable
and antenna, OK?
OK
Check Tuner power line:
3.3V at JL3019 = 3.3V?
1.0V at FB3102=1.0V? (NA ATSC3.0, JP)
1.0V at FB3103=1.0V(PA ISDB)
OK
All broadcasting channel
cannot be received?
OK
Digital
Analog
Refer Analog Tuning
Change RF cable and antenna
NG
NG
Please refer DDCON
troubleshooting
NG
Check part mounting condition
for I2C SDA & SCL line. (Refer Note I2C)
Terrestrial/Cable
For TW, NA-ATSC(MX/UC) ,
*1
CH/HK, LA, PA, EU
Refer Digital Tuning 1
NG
OK
Satellite
Check LNB power line
12V at C3028 = 12V?
OK
For JP, NA ATSC 3.0,
and PA ISDB
Refer Digital Tuning 2
Notes: I2C
- Parts for I2C SDA line: R3036, C3005
- Parts for I2C SCL line : R3035, C3006
Waveform confirmation point
• I2C_TU_ SDA line: JL3013
• I2C_TU_SCL line : JL3012
Notes: Demodulator
- Digital Tuning 1 : SoC inside demodulator
- Digital Tuning 2 : On board demodulator
*1 : Except US ATSC3.0, Please refer Digital Tuning 2
Change NG parts connected
to I2C bus
NG
12V LNB Voltage Checking
64
SYS SET