No Picture (Tuner) - Sony X850E Series Service Manual

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4-3. NO PICTURE (TUNER)

RF input no picture / noisy picture
Check RF source cable
and antenna, OK?
OK
Check Tuner power line:
3.3V at JL2800 = 3.3V?
1.8V at JL2801 = 1.8V?
A_RESET value at JL2807 = 3.3V?
OK
All broadcasting channel
cannot be received?
NO
Digital
Analog
Refer Analog Tuning
XBR-65/75X850E
NG
Change RF cable and antenna
NG
Please refer DDCON
troubleshooting
Check part mounting condition
YES
for I2C SDA & SCL line. (Refer Note I2C)
Check Tuner module connection.(CN2800)
Terrestrial/Cable
For TW, NA-ATSC(MX/UC),
JP_SKP(Opticast) and LA-ISDB-T
Refer Digital Tuning 1
Notes: I2C
I2C line for all tuners except Japan_SKP
- Parts for I2C SDA line: R2800, C2803.
- Parts for I2C SCL line : R2801, C2804.
I2C line for Japan_SKP
- Parts for I2C SDA line: R2804
- Parts for I2C SCL line : R2805
NG
And
OK
OK
Check Tuner power line
12V at JL2822 = 12V?
For AEP_W, JP_SKP, PA_T2,
CH/HK, and LA-T2(COL)
Refer Digital Tuning 2
TROUBLE SHOOTING
Change NG parts
connected to I2C bus
Satellite
NG
12V LNB Voltage Checking
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