53
4.4 No Picture - Tuner
RF input no picture / noisy picture
Change RF cable and antenna
Please refer DDCON
troubleshooting
OK
OK
NG
NG
Check RF source cable
and antenna, OK?
Check Tuner power line:
3.3V at JL3019 = 3.3V?
All broadcasting channel
cannot be received?
OK
NG
Check part mounting condition
for I2C SDA & SCL line. (Refer Note I2C)
Change NG parts connected to
I2C bus
NG
OK
Notes: I2C
- Parts for I2C SDA line: R3036, R3040, C3005
- Parts for I2C SCL line : R3035, R3039, C3006
Waveform confirmation point
•
I2C_TU_SDA line: JL3013
•
I2C_TU_SCL line : JL3012
Analog
Refer Analog Tuning
Refer Digital Tuning 1
Digital
Check LNB power line
12V at C3028 = 12V?
Satellite
Refer Digital Tuning 2
NG
OK
12V LNB Voltage Checking
For TW, NA-ATSC(MX/UC)
*1
,
CH/HK, LA, PA, AEP
For JP, US ATSC 3.0, and
Philippines
Terrestrial/Cable
*1 : Except US ATSC3.0, Please refer Digital
Tuning 2
Notes: Demodulator
- Digital Tuning 1 : SoC inside demodulator
- Digital Tuning 2 : On board demodulator
T R O U B L E S H O O T I N G
SAFETY NOTES
SELF DIAGNOSTIC FUNCTION
TROUBLESHOOTING
SERVICE ADJUSTMENT
DIAGRAM
HANDLING GUIDE
53
SYS SET
2021/02/04 23:38:48 (GMT+09:00)