Panasonic SA-PT750PC, Service Manual

Page: 130 / 155

22.2. Basic Troubleshooting Guide for HDMI AV output
Problems Checking Points Checking Components
1) Check setting of the set *This year HDMI always
ON. No need check Setup
Menu.
If no resolution selection
GUI, then only check
SETUP.
in Setup Menu whether the
HDMI Video output is
turned On
2) +5V Supply to the TV IC3952 (Pin 4)
3) HDMI Connector
Solderability condition P3901
4) HDMI Output TDMS
signal lines (IC3901)
- Data (Pin 72, 73, 76,
77, 80, 81)
- Clock (Pin 10,12)
L3903, L3904, L3905,
L3906
5) HDMI Transmitter
communication lines to TV
- Data, SDA (Pin 120,
IC8001)
- Clock, SCL (Pin
121, IC8001)
LB3905, R3905, Q3902,
R3904
LB3904, R3907, Q3903,
R3906
6) HDMI Transmitter
communications from LSI
(IC8001) RX3901
7) Local Port Slave Address
setting resistor R3921
8) HDMI Transmitter
+3. 3V Supply LB3901, IC3901 (Pin 26,
42, 47, 52, 70, 84, 100, 106,
115)
9) HDMI Transmitter
+1.2V Supply IC3901 (Pin 5, 26, 47, 42,
55, 75, 85, 102, 109, 116,
123), LB3908, IC8151 (Pin
2, 4)
10) HDMI Up -Con +3.3V
Supply LB3901
11) HDMI Pixel Clock
Output from Up -Con to
HDMI Transmitter R8902
12) Up -Con IC I2C Data
and Clock Line RX3706
13) Hot -Plug Signal LB3906, R3902, R3903,
Q3901, D3901
1) TV does not have any
display. Set FL display
shows U702/U703
14) TDMS Output swing
amplitude control resistor R3901
15) Host Interface External
Input Clock from LSI
(IC8001) to Up - Con IC
(IC3901)
OSC27M
LB8702
16) Video Data Lines from
LSI (IC8001) to Up-Con
(IC3901) RX3707, RX3708
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SA-PT750P / SA-PT750PC