DOWNLOAD Panasonic SA-XH175EE / SA-XH175GS / SC-XH175EE Service Manual ↓ Size: 8.27 MB | Pages: 127 in PDF or view online for FREE

45

Problems Checking 

Points

Checking 

components

b) Check video signals (CVBS)

LB8317, R8325, IC8011 (Pin 63)

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, CL8532 (For DVD),  
Q8562, CL8530 (For CD)

a) Check motor driver circuitry 
(VCC PVCC)

IC8251 Pin 8, (+9V), 19 (+5V)

2) No TOC/Long TOC

c) Check LSI IC connection to 
motor drive circuitry 

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 

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) 

46

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 to 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 
lines (IC3901)

- Clock (TXCP/TXCN => Pin 50, 49)
- Data (TXD0P/TXD0N => Pin 52, 51) 
- Data (TXD1P/TXD1N => Pin 54, 53)
- Data (TXD2P/TXD2N => Pin 56, 55)

 HDMI Connector (P3901)

- Clock (TXCP/TXCN => Pin 10, 12)
- Data (TXD0P/TXD0N => Pin 7, 9)
- Data (TXD1P/TXD1N => Pin 4, 6) 
- Data (TXD2P/TXD2N => Pin 1, 3)

- Data, DDCDAT (Pin 46, IC8001)
- Clock, DDCCLK (Pin 47, IC8001)

5) HDMI Transmitter communication 
lines to TV

6) HDMI Transmitter communication 
from DVD Decorder (IC8001) +3.3V
Supply

7) HDMI Transmitter DVD Decorder 
(IC8001) +1.8 V Supply

8) Hot-Plug Signal

9) HDMI Interface Reference
Resistor

1) Supply to 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'

- Clock (TXCP/TXCN => Pin 10, 12)
- Data (TXD0P/TXD0N => Pin 7, 9) 
- Data (TXD1P/TXD1N => Pin 4, 6) 
- Data (TXD2P/TXD2N => Pin 1, 3)

* Check for solder short/or 
component missing on TDMS line 
as well as signal intergrity HDMI  
Connector (P3901)

LB3905, R3905, Q3902, R3904 
LB3904, R3907, Q3903, R3906 

LB3901 (Pin 57)

LB3902, LB3910, R3910 (Pin 59)

LB3906, R3902, R3903, Q3901

C8034, C8006, C8029, C8028, 
LB3901 (Pin 57), LB3902, LB3910 
(Pin 59)

Pin 1, 2, 5, 6 (IC8651)
Pin 105, 106, 107, 109 (IC8001)

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

47

Prepare service tools before process service position.

Ref. No

Service Tools

Remarks

SFT1

Main P.C.B. (CN2006) - D-Amp P.C.B. (CN5402)

RFKZBTT270K3 (18P FFC)

48

• Select items from the following indexes when disassembly or replacement are required.
• Disassembly of Top Cabinet
• Replacement of Tray Ornament
• Disassembly of Front Panel Block Assembly
• Disassembly of Operation Button P.C.B.
• Disassembly of Power Button P.C.B.
• Disassembly of Mic P.C.B.
• Disassembly of Panel P.C.B.
• Disassembly of Rear Panel
• Disassembly of Fan Unit
• Disassembly of Main P.C.B.
• Disassembly of D-Amp P.C.B.
• Replacement of Digital Amplifier IC (IC5100/IC5200/IC5300)
• Disassembly of AC Inlet P.C.B.
• Disassembly of SMPS P.C.B.
• Replacement of Switching Regulator IC (IC5701)
• Replacement of Diode (D5702)
• Replacement of Diode (D5802)
• Replacement of Diode (D5803)
• Disassembly of DVD Mechanism Unit (BRS11D)
• Replacement of Traverse Unit.