Sony KD-43X85K Service Manual page 70

TROUBLESHOOTING
FOR DIGITAL TUNING For US ATSC3.0 and Philippines
4.4 No Picture at Tuner -
NG
Check part mounting condition
for I2C SDA & SCL line.
NG (Refer Note I2C)
OK
Change Tuner module
Check the status of IC3001 peripheral
Change NG parts
components
(UC ATSC 3.0, Philippines, JP)
Digital Tuning 2
For NA ATSC3.0
and PA ISDB
Sound is normal?
OK
No sound
Can it preset Digital broadcast?
OK
NG
Can it preset Analog broadcast?
TU1_TS_VALID, TU1_TS_SYNC, TU_TS1_DATA1(JP Only)"
OK
Check part mounting condition
for X_DEMOD_RST_STBY line.
(Refer Note RST) NG
OK
For JP
NG
Confirm ANT or
A
Satellite connection
OK
Replace B-board
Check part mounting condition for digital data line
"TU1_TS_DATA0, TU1_TS_CLK,
(Refer Notes: TS line)
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 NA ATSC3.0/PA ISDB
R3120/R3121/ R3122/ R3123/ R3114/ C3126/ R3116/R3117/RB3001
- TS line parts for JP :
R3113/R3120/R3121/ R3122/ R3123/ R3114/ C3126/
R3116/R3117/RB3001
A : Insert correct signal in correct ANT terminal.
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