Sony XR-55A75L Service Manual page 113

TROUBLESHOOTING
4.4 No Picture at Tuner - FOR DIGITAL TUNING 2 For US ATSC3.0 and Philippines
NG
Check part mounting condition
for I2C SDA & SCL line.
NG
(Refer Note I2C)
OK
Change Tuner module
Check the status of IC3001 peripheral
components
Change NG parts
(UC ATSC 3.0, Philippines)
Digital Tuning 2
For US ATSC3.0
and Philippines
Sound is normal?
OK
No sound
Can it preset Digital broadcast?
OK
NG
Can it preset Analog broadcast?
OK
Check part mounting condition
for X_DEMOD_RST_STBY line.
NG
(Refer Note RST)
OK
OK
Check IC1000
(SoC)
Check part mounting condition for digital data line
"TU1_TS_DATA0, TU1_TS_CLK,
TU1_TS_VALID, TU1_TS_SYNC.
NG
Change NG parts
Change NG parts
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: TS line
-TS line parts for US ATSC3.0/Philippines
R3120/R3121/ R3122/ R3123/ R3114/ C3126/
R3116/R3117/RB3001
OK
Replace B-board
Notes: RST
- Parts for X_DEMOD_RST_STBY line:
R3109, C3117
Voltage confirmation point
C3117 = 3.3V
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SYS SET