Panasonic TX-PR42UT30 Service Manual ▷ View online
17
7 Troubleshooting Guide
Use the self-check function to test the unit.
1. Checking the IIC bus lines
2. Power LED Blinking timing
2. Power LED Blinking timing
7.1.
Check of the IIC bus lines
7.1.1.
How to access
7.1.1.1.
Self-check indication only:
Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [OK] button on the remote control
for more than 3 seconds.
for more than 3 seconds.
7.1.1.2.
Self-check indication and forced to factory shipment setting:
Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [MENU] button on the remote con-
trol for more than 3 seconds.
trol for more than 3 seconds.
7.1.2.
Screen display
7.1.3.
Check Point
Confirm the following parts if NG was displayed.
7.1.4.
Exit
Disconnect the AC cord from wall outlet or switch off the power with [ Power ] button on the main unit.
DISPLAY
Check Ref. No.
Description
Check P.C.B.
TUN
TU4801
TUNER
A-BOARD
STBY
IC8000
PEAKS-LDA3(STM)
A-BOARD
MEM1
IC8902
PEAKS EEPROM
A-BOARD
MEM2
IC8901
STM EEPROM
A-BOARD
AVSW
IC3001
AUDIO/VIDEO SW
A-BOARD
TEMP
IC2001
TEMP SENSOR
A-BOARD
LAN
IC8601
ETHERPHY
A-BOARD
ID2
A-BOARD
LP1
IC9300
LP1
A-BOARD
IRDRV
IC5901
IR LED DRIVER
A-BOARD
18
7.2.
Power LED Blinking timing chart
1. Subject
Information of LED Flashing timing chart.
2. Contents
When an abnormality has occurred the unit, the protection circuit operates and reset to the stand by mode. At this time, the
defective block can be identified by the number of blinks of the Power LED on the front panel of the unit.
defective block can be identified by the number of blinks of the Power LED on the front panel of the unit.
7.3.
No Power
First check point
There are following 3 states of No Power indication by power LED.
There are following 3 states of No Power indication by power LED.
1. No lit.
2. Green is lit then turns red blinking a few seconds later. (See 7.2.)
3. Only red is lit.
2. Green is lit then turns red blinking a few seconds later. (See 7.2.)
3. Only red is lit.
Blinking Times
Contents
Check point
1
Panel information SOS
PD5 Start SOS
PD5 Start SOS
-
3
P+ 3.3V SOS
A-Board
4
Power SOS
P-Board
5
P+ 5V SOS
A-Board
6
Driver SOS1
(SN Energy recovery circuit)
(A-SN FPC DET)
(SN Energy recovery circuit)
(A-SN FPC DET)
SN-Board
A-SN FPC
7
Driver SOS2
(SN Connector DET)
(SN Scan and Logic IC)
(SN Connector DET)
(SN Scan and Logic IC)
SN-Board
8
Driver SOS3
(SS FPC DET)
(SS Energy recovery circuit)
(SS FPC DET)
(SS Energy recovery circuit)
SS-Board
SS FPC
9
Discharge Control SOS
A-Board
10
Sub 5V SOS
Sub 3.3V SOS
Tuner power SOS
Sub 3.3V SOS
Tuner power SOS
A-Board
SN-Board
SS-Board
SS-Board
P-Board
12
Sound SOS
A-Board
Speaker
Speaker
13
Emergency SOS
A-Board
14
IROM SOS (ROM in Peaks IC)
A-Board
P-Board
P-Board
19
7.4.
No Picture
20
7.5.
Local screen failure
Plasma display may have local area failure on the screen. Fig-1 is the possible defect P.C.B. for each local area.
Fig-1
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