DOWNLOAD Panasonic SA-XH10EE / SC-XH10EE Service Manual ↓ Size: 8.03 MB | Pages: 127 in PDF or view online for FREE

Model
SA-XH10EE SC-XH10EE
Pages
127
Size
8.03 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio / DVD HOME THEATER SOUND SYSTEM
File
sa-xh10ee-sc-xh10ee.pdf
Date
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Panasonic SA-XH10EE / SC-XH10EE Service Manual ▷ View online

37
8.2.
DVD/CD Laser Diode current measurement.
This section will illustrate procedures of measuring& deriving DVD/CD Laser Diode Current.
DVD Laser Diode Current Measurement
CD Laser Diode Current Measurement
Checking Item/ Formula
Remarks
Item Description
1. Measurement the voltage (V
CD
) on the testpoints CL8530(+) & CL8531(-).
This is voltage across R8566 which has a resistance value of 4.7 ohm.
2. Calculate the CD Laser current by the following formula:
CD_LD=VCD/4.7
1. Measurement the voltage (V
DVD
) on the testpoints CL8530(+) & CL8532(-).
This is voltage across R8556 which has a resistance value of 4.7 ohm.
2. Calculate the DVD Laser current by the following formula:
DVD_LD=VCD/4.7
Refer to 8.2.1. 
Backend P.C.B. 
(Fig. 3. Backend 
P.C.B.)
Refer to 8.2.1. 
Backend P.C.B. 
(Fig. 3. Backend 
P.C.B.)
3. Specification for CD laser current is
58 mA
3. Specification for DVD laser current is
58 mA
38
8.2.1.
Backend P.C.B
Fig. 3. Backend P.C.B.
CL8530, CL8531, CL8532
R8556
R8566
(Side A of Backend P.C.B.)
(Side B of Backend P.C.B.)
39
8.3.
Basic Troubleshooting Guide for Traverse Unit (Backend P.C.B.)
Problems Checking 
Points
Checking 
components
b) Check video signals (CVBS)
LB8317, R8325 (CVBS)
a) Check SDRAM address, data 
bus, CLK and other control signals 
waveform
IC8051
1) Distorted picture or 
abnormal sound is head 
during the initialization
c) Check audio DAC circuitry 
* Compare the above with 
OK condition DVD Module
P.C.B
LB8422  till LB8428
*Check for solder short and/or  
component missing/damaged 
b) Check laser drive circuitry 
(Voltages & current) 
Q8552, CL8510 
Q8562, CL8520 
 (For DVD),
 (For CD) 
a) Check motor driver circuitry 
(VCC PVCC)
IC8251 Pin 8, (+9V), 21 (+5V)
2) No TOC/Long TOC
c) Check LSI IC connection to
motor drive circuitry 
* Compare the above with OK 
condition Main P.C.B. 
IC8001 Pin 90, 93, 94, 95
IC8251 Pin 11 to 18 
* Check for solder short and/or 
component missing/damaged 
a) Check connection from 
Main to Traverse unit 
FP8251
3) Disc not spinning
4) Traverse not moving
5) Traverse and spindle 
abnormal  movement
b) Check motor driver circuitry on 
the voltages and control signals 
* Compare the above with 
OK condition Main P.C.B.
IC8251
* Check for solder short and/or  
component damaged
6) Cannot read the disc but 
spindle motor is spinning
- Cannot read CD/DVD
a) Check laser drive circuitry 
(voltages and current) 
     - Check CD Laser Drive 
     - Check DVD Laser Drive 
* Check voltages and LD current 
and compare with OK condition 
Main P.C.B.
Q8552, LB8551
(For DVD Laser Drive current) 
Q8562, LB8561 
(For CD Laser Drive current)  
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 (FP8531 & FP8251) 
40
8.4.
Basic Troubleshooting Guide for HDMI AV output
Problems Checking 
Points
Checking 
components
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
P3901
4) HDMI Output TDMS signal  
 HDMI Connector (P3901)
lines (IC3901)
- Clock (TXCP/TXCM =>
Pin 50, 49)
- Data (TX0P/M => Pin 52, 51)
- Data (TX1P/M => Pin 54, 53)
- Data (TX2P/M => Pin 56, 55)
- Clock (TXCP/TXCM =>
Pin 10, 12)
- Data (TX0P/M => Pin 7, 9)
- Data (TX1P/M => Pin 4, 6)
- Data (TX2P/M => Pin 1, 3)
 HDMI Connector (P3901)
- Clock (TXCP/TXCM =>
Pin 10, 12)
- Data (TX0P/M => Pin 7, 9)
- Data (TX1P/M => Pin 4, 6)
- Data (TX2P/M => Pin 1, 3)
- Data, SDA (Pin 46, IC8001)
- Clock, SCL (Pin 47, IC8001)
5) HDMI Transmitter
communication lines to TV
6) HDMI Transmitter
communication from LSI (IC8001)
+3.3V Supply 
7)HDMI Transmitter LSI IC (IC8001) 
+1.8 V Supply
8) Hot-Plug Signal
9) HDMI Interface Reference 
Resistor
1) Supply fo HDMI transmitter 
intergrated (IC8001)
2) Check for Capacitor short to GND
Check Digital Signal Data 
communication lines from IC8001 to 
Serial Flash IC (IC8651)
Check the setting under ’SETUP’
menu if HDMI Audio Output option 
is turned ’ON’
* Check for solder short/or 
component missing on TDMS line 
as well as signal intergrity
LB3905, R3905, Q3902, R3904 
LB3904, R3907, Q3903, R3906 
LB3901 (Pin 57)
LB3902, LB3910, R3910 (Pin 59)
LB3906, R3902, R3903, Q3901
C8034, C8006C C8029, C8028, 
Pin 1, 2, 5, 6 (IC8651)
Pin 105, 106, 107, 109 (IC8001)
LB3901 (Pin 57), LB3902, LB3910 
(Pin 59)
R3901
1) TV does not have any 
display. Set FL display 
shows U702/U703
2) When switching the video
output mode from 480p to 
720p /1080i, TV display 
become blank
3) Error Video Output. TV 
screen shows green Display
4) No audio output from HDMI
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