Panasonic PT-60LCX64-K, Service Manual, Page: 119 / 279

Cooling Fan (Fan1, Fan2 and/or Fan3) malfunction.
1)
How to solve the problem indicated by the Error Indication of LED
(All symptom is that Lamp turns off or Lamp does not light up)
Note: Before performing the troubleshooting, confirm that all connector cables in the unit are connected to connectors correctly.
Error No. Problem Possible Solution
Check if the voltage between Pin 2
and Pin 3 of IC2902, IC2903, and
IC2904 on the LCD Drive C.B.A. is
approx. +12V.
Check if the voltage between Pin 1
and Pin 3 of IC2902, IC2903, and
IC2904 on the LCD Drive C.B.A. is
more than +2V. (FAN 0H (H))
Check if the voltage between Pin 5
and Pin 3 of IC2902, IC2903, and
IC2904 on the LCD Drive C.B.A. is
approx. +1V~+4V(FAN Speed
Control).
Check if the voltage between Pin 1
and Pin 2 of P2902, P2903, and
P2904 on the LCD Drive C.B.A. is
approx. +5V~+12V(FAN Input
Voltage).
Check if the voltage at Pin 3 of
P2902 on the LCD Drive C.B.A. is
approx. 0V.
(Pin 3: FAN 1 lock (H))
Replace the Fan Case Unit
(including FAN1).
Check the Power C.B.A. (+12V line)
(Refer to "CHECKING THE POWER
C.B.A.")
NO
NO
YES
YES
YES
Check if the voltage at Pin 53, 55,
and 73 of IC2304 on the LCD Drive
C.B.A. is approx. +1V~+4V.
YES
NO
NO
NO
NO
1. Confirm that all connector cables are connected to the connectors correctly.
2. Check the following Fan lock signals.
NO
Check if the voltage at Pin 3 of
P2903 on the LCD Drive C.B.A. is
approx. 0V.
(Pin 3: FAN 2 lock (H))
Replace the FAN 2.
NO
NO
Replace IC2902, IC2903, or IC2904.
YES
Replace IC2304.
Check if the voltage at Pin 3 of
P2904 on the LCD Drive C.B.A. is
approx. 0V.
(Pin 3: FAN 3 lock (H))
Check if the signals at Pin 28 and
Pin 30 of IC2304 (FAN2, 3 Speed
Control) and Pin 7 of IC2503 (FAN1
Speed Control) on the LCD Drive
C.B.A. is High (approx. +3.3V).
NO
Still NG
NO
Check if the voltage at Pin 10, 11,
and 56 of IC2304 on the LCD Drive
C.B.A. is approx. +5V.
Check if the voltage at Pin 17 of
P2501 on the LCD Drive C.B.A. is
approx. 0V. (FAN1, 2, 3 lock (H))
Check if the voltage at Pin 17 of
P5302 on the Main C.B.A. is approx.
0V. (FAN1, 2, 3 lock (H))
Check if the voltage at Pin 9 of
IC6001 on the Main C.B.A. is approx.
+3.3V. (FAN1 Speed Control)
NO
Check the signal line between Pin 26
of IC6302 and Pin 9 of IC6001, and
IC6302 on the Main C.B.A.
Repair if necessary.
Check the signal line between Pin 1
of IC2902 (IC2903, IC2904) and
Pin 53, 55, 73 of IC2304 on the LCD
Drive C.B.A.
Repair if necessary.
YES
YES
Check the signal lines of FAN 1 speed
control, FAN2 speed control, and FAN3
speed control, and the surrounding
parts on the LCD Drive C.B.A.
Check the signal line between Pin 26
of IC6302 and P5302 on the Main
C.B.A.
Repair if necessary.
Replace the 20-pin Cable (Ref. No.
14) between P2501 on the LCD Drive
C.B.A. and P5302 on the Main C.B.A.
YES
YES
Check the surrounding parts of
IC2304 on the LCD Drive C.B.A.
Repair if necessary.
Check the Power C.B.A. (+5V line)
(Refer to "CHECKING THE POWER
C.B.A.")
Replace the FAN 3.
NO
YES
PT-60LCX64-K
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