Panasonic SA-NC9GC, Service Manual

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20 Basic Troubleshooting Guide
20.1. Basic Troubleshooting Guide for Traverse Unit (DVD Module P.C.B.)
Problems Checking Points Checking Components
1) Distorted picture or abnormal
sound
is heard during the
initialization.
a) Check SDRAM address, data bus, CLK and
other control signals waveform. IC8051
b) Check video signals. LB8301, R8321, R8322, LB8302, R8325 & R8326
c) Check audio DAC circuitry.
* Compare the above with OK condition HDMI
Module P.C.B. IC8421
* Check for solder short and/or component
missing/damaged
2) No TOC / Long TOC. a) Check motor driver circuitry (+5V). IC8251 in Pin 8 & 21
b) Check laser drive circuitry (voltages & current). Q8551, Q8552, Q8561 & Q8562
c) Check LSI IC connection to motor drive circuitry.
* Compare the above with OK condition HDMI
Module P.C.B.
IC8001 Pin 144 & 145
* Check for solder short and/or component
missing/damaged
3) Disc not spinning.
4) Traverse not moving
5) Traverse and spindle abnormal
movement a) Check connection from HDMI Module to
Traverse unit. FP8251
b) Check motor driver circuitry on the voltages and
control signals. IC8251
* Check for solder short and/or component
missing/damaged
6) Cannot read the disc but spindle
motor is spinning. a) Check laser drive circuitry (voltages and
current).
- Check CD Laser Drive
- Check DVD Laser Drive
* Compare voltages and LD current and compare
with OK condition HDMI Module P.C.B.. Q8551, Q8552, LB8531
(For DVD Laser Drive current)
Q8561, Q8562, LB8561
(For CD Laser Drive current)
b) Check motor driver circuitry on the voltages and
control signals. IC8251
* Check for solder short and/or component
missing/damaged
7) Block Noise during play. a) Check SDRAM address and data bus signal IC8051
8) Jitter out of specification. a) Check LD current
b) CHeck OPU (Change to other unit and
confirmed operating condition) OPU Unit (Traverse Unit), FPC connection
20.2. Basic Troubleshooting Guide for HDMI AV output
Problems Checking Points Checking Components
1) TV does not have any display.
Set FL display shows U702/U703. 1) Check setting of the set in Setup Menu
whether the HDMI Video output is turned ON. * This year HDMI always ON. No need check Setup
Menu.
If no resolution selection GUI, then only check SETUP.
2) +5V Supply to the TV. IC3952 (Pin 4)
3) HDMI Connector Solderability condition.
b) Check video signals.
c) Check audio DAC circuitry.
* Compare the above with OK condition
Module.
P3901
4) HDMI output TDMS signal lines (IC3901).
- Data (Pin 72, 73, 76, 77, 80 & 81)
- Clock (Pin 10 & 12)
LB3903, 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 communication from LSI
(IC8001). RX3901
7) Local Port Slave Address setting resistor. R3921
8) HDMI Trans3.3V Supply. LB3901, IC3901 (Pin 26, 42, 47, 52, 70, 84, 100, 106 &
115)
9) HDMI Trans1.2V Supply. IC3901 (Pin 5, 26, 42, 47, 55, 75, 85, 102, 109, 116 &
123), 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 12C Data and Clock Line. RX3706
13) Hot-Plug Signal. LB3906, R3902, R3903, Q3901 & D3901
14) TDMS Output swing amplitute 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 IC (IC3901). RX3707 & RX3708
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SA-NC9GC / SA-NC9GS / SA-NC9GCS / SA-NC9GN