Read Panasonic TH-55LF8U / TH-55LF8W (serv.man2) Service Manual online
INF-15
SECTION 1 SERVICE INFORMATION
<55LF8>
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.
* 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.
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