Panasonic TH-55AF1U / TH-55AF1W (serv.man2) Service Manual ▷ View online
INF-15
SECTION 1 SERVICE INFORMATION
<55AF1>
4. Troubleshooting Guide
The failure symptom "Power off" or "No picture or No sound" is reported but it can not be confirmed in the service, use this
function to confirm the failure status and narrow down the failure circuit.
4. 1. Self check of signal system
1. Display the CAT mode (Refer to 3.1.).
2. The CAT mode menu appears on the screen. Select the [ID Mode] menu with [pq] buttons, and press and hold the
[MUTE] button until the ID mode menu appears. (It takes a few seconds to display it.)
To exit the ID mode
- Press the [RETURN] button to return to the CAT mode menu
- Turn the Display off with remote control or unit. (In case the Main MCU version is 1.00 or 1.01)
CAT Panel sys.8.2
IIC Mode
CD Mode
NW Mode
SD Mode
MS Mode
ID Mode
n
Treatment action
Items
IIC Device
Symptom
Action
IIC1
H90MEM
Not memorized some settings below.
Items listed below in the SETUP menu.
(Display ID Setting/Timer Setting/Control Terminal Select)
Check or replace A module
H49HDMI-SW
Abnormality on the picture of Digital signal (HDMI1, HDMI2, DVI-
D)
IIC2
H62TEMP
High temperature is detected inside the display.
A H90MEM
OK
H49HDMI-SW
OK
H62TEMP
NG
ID
IIC1 IIC2 IIC3 IIC4
MONITOR-MCU
1.0100AF1 9
MONITOR-EEPROM
01.01 0
MONITOR-SUB MCU
01.00
MONITOR-PANEL
55
OpenPort PLATFORM-uboot
1.00.00
OpenPort PLATFORM-kernel
3.10.53
OpenPort PLATFORM-system
1.03.00
INF-16
SECTION 1 SERVICE INFORMATION
<55AF1>
4. 2. Self check of power system
When an abnormality has occurred to the unit, the protection circuit operates and resets to the stand by mode.
At this time, the defective block can be identified by the number of blinks of the Power LED .
Blinking
times
Failure code
(PTCT)
Contents & Check point
Check point (Caused problem)
1
01
n
PANEL 24V SOS
Detects back light error from the Panel module.
• Abnormality on +24V power line or on panel
module
Check the 24V lines supplied form P module, and
parts or circuit connected to 24V lines, and the con-
nection cables to the back light module on the panel.
( P module, LCD panel module)
4
04
n
PANEL 12V SOS
Detects +12V voltage fall of power supplied from
A module to Panel module (Timing Controller)
• Abnormality on +12V power line to panel
Check the 12V lines supplied form P module, and
parts or circuit connected to 12V lines, and connec-
tion cable to the T-CON module on the panel.
( P module, A module, LCD panel module)
9
09
n
SOUND SOS
• Abnormality on power line to audio amplifier
circuit
Check the audio supply voltage from P module, and
parts or circuit connected to the audio supply line.
13
0D
n
REGULATOR SOS
Detects abnormal voltage on the regulators on
A module.
• Abnormality on power lines, +1.0V, +1.1V,
+1.2V, +1.5V, +1.8V, +3.3V
Check the low voltage lines on the A module and
parts or circuit connected to the low voltage line.
14
0E
n
OP SOS
It has detected a voltage drop of the power sup-
ply in the OPF module.
• GEN_3V3, VCOR_1V3, VDDSOC_1V375,
DDR_1V5, ETH_2V5, PMIC_5V, AUX_5V0,
OP_P16V
Check the OPF supply voltage from A module and
circuit connected to the OPF supply line.
( OPF module )
* The failure code is the PTCT information displayed on the CD mode in the service mode. Refer to the item [3.3. Software,
EEPROM version and failure display (CD Mode)] for further details.
INF-17
SECTION 1 SERVICE INFORMATION
<55AF1>
4. 3. Troubleshooting flow
4. 3. 1. No power
11
5. Troubleshooting Guide
5.1 No Power
No power (LED “Off”)
Check the AC input and
the power is “ON”?
the power is “ON”?
Power “On”
Power board CN903 Pin
2/3 output=5V?
Replace the Power board
Yes
No
Yes
No
Use RC or Key to turn on
the PD
No
Yes
1. RC can turn on the PD and Key can’t,
replace the key board.
2. Key can turn on the PD and RC can’t,
replace the RC.
Replace the Main board
INF-18
SECTION 1 SERVICE INFORMATION
<55AF1>
4. 3. 2. Abnormal display
12
5.2 Abnormal Display
Abnormal Display
Replace LVDS Cable
Replace the main board
Replace the panel
No
No
Yes
No
Enter factory mode
to Reset
Replace the main board
No
Yes
Reset
Check the OSD is
normal?
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