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41

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) 

42

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

43

Prepare service tools before process service position.

Ref. No

Service Tools

Remarks

SFT1

Main P.C.B. (CN2002) - Panel P.C.B. (P6001)

RFKZXH150GK1 (28P FFC)

SFT2

Main P.C.B. (CN2001) - Backend P.C.B. (FP8101)

RFKZXH150PK2 (50P FFC)

44

• Select items from the following indexes when disassembly or replacement are required.
• Disassembly of Top Cabinet
• Disassembly of Wireless Adapter P.C.B.
• Disassembly of Rear Panel
• Disassembly of Fan
• Disassembly of Front Panel Block Assembly
• Disassembly of Panel P.C.B.
• Disassembly of Operation Button P.C.B.
• Disassembly of Power Button P.C.B.
• Disassembly of Front Lid Assembly
• Replacement of Cradle Ornament
• Disassembly of DVD Mechanism Unit (BRS1D)
• Replacement of Traverse unit
• Disassembly of AC Inlet P.C.B.
• Disassembly of D-Amp P.C.B.
• Replacement of Digital Amplifier IC (IC5100/IC5200/IC5300)
• Disassembly of Main P.C.B.
• Disassembly of Backend P.C.B.
• Disassembly of SMPS P.C.B.
• Replacement of Switching Regulator IC (IC5701)
• Replacement of Rectifier Diode (D5702)
• Replacement of Thermal Diode (D5802)
• Replacement of Regulator Diode (D5803)