Panasonic PT-44LCX65-K, Service Manual, Page: 110 / 236

The Temperature Sensor (R2821) on the Thermistor 2
C.B.A. on the Lamp House is shorted or open.
How to solve the problem indicated by the Error Indication of LED
Problem Possible Solution
10)
Remove the P2303 connector on the LCD
Drive C.B.A., and check if the resistance
between Pin 1 and Pin 2 of P2821 on the
Thermistor 2 C.B.A. is 5k
Ω
~1M
Ω
.
Check if the voltage at Pin 64 of IC2303
on the LCD Drive C.B.A. is +0.1V~+3.2V
(Temperature Data1).
Replace the Temperature Sensor
(R2821) on the Thermistor 2 C.B.A.
NO
Check IC2303 and the surrounding parts
on the LCD Drive C.B.A.
Repair if necessary.
YES
YES
1. Confirm that all connector cables are connected to the connectors correctly.
2. Check the following Temperature data lines.
Check the signal line between Pin 2 of
P2303 and Pin 64 of IC2303 on the LCD
Drive C.B.A.
Repair if necessary.
Error No.
NO
Clogged Air Filter. 12)
11)
Clean the Air Filter on the Projection Unit.
Check if the voltage at Pin 18 of P5701
on the Main C.B.A. is approx. +1.4V. Check if the voltage at Pin 93 of IC6003
on the Main C.B.A. is approx. +1.4V.
Check the signal line between Pin 18 of
P5701 and Pin 93 of IC6003 and the
surrounding parts on the Main C.B.A.
Repair if necessary.
Check IC6003 and the surrounding
parts on the Main C.B.A.
Repair if necessary.
Check if the voltage at Pin 18 of P2501
on the LCD Drive C.B.A. is approx. +1.4V.
Replace the Fan Case Unit (including
FAN1).
NO
YES NO
Check the signal line between Pin 18 of
P2501 and Pin 2 of P2902 and the
surrounding parts on the LCD Drive
C.B.A.
Repair if necessary.
YES
Replace the 20-pin Cable (Ref. No. 14)
connecting P5701 on the Main C.B.A.
and P2501 on the LCD Drive C.B.A.
YES
1. Relocate the unit to a proper location.
• Do not place in direct sunlight and other sources of direct heat.
• Do not place the unit in humid or dusty locations, or areas exposed to smoke or steam.
(Surrounding temperature should be between 0 C (32 F) and 40 C (104 F) and humidity
should be between 20 % and 80 % with no condensation.)
• Ensure that the vents are not blocked.
It is recommended that a gap of at least 10 cm be left all around the unit even when it is
placed inside a cabinet or between shelves.
2. Check if the fans are operating properly. When the temperature detected by the Temperature
Sensor (R2821) on Thermistor 2 C.B.A. exceeds
105 C (221 F), it will be indicated by LED.
1. The surrounding temperature of the place of use
may be too high.
2. The vents on the rear may be blocked.
NO
Still NG
Still NG
PT-44LCX65-K / PT-52LCX65-K / PT-61LCX65-K
110