Panasonic PT-56LCX70 Service Manual page 27

How to solve problems indicated by the Error Indication
(The symptom of all errors is that the Lamp goes off)
Note: Before performing the troubleshooting, confirm that all connector cables in the unit are connected correctly.
LAMP
Problem
Indicator
2
[LAMP Indicator two blinks]
Lamp does not light up.
[LAMP Indicator three blinks]
3
Lamp failure (Internal Lamp thermistor open or short).
4
[LAMP Indicator four blinks]
Abnormal Lamp temperature (more than 92 ˚C).
[LAMP Indicator five blinks]
5
Lamp communication error.
8
[LAMP Indicator eight blinks]
Cooling Fan (Lamp Fan) malfunction.
[LAMP Indicator nine blinks]
9
Cooling Fan (OPT Fan) malfunction.
10
[LAMP Indicator ten blinks]
Cooling Fan (Front Fan or Rear Fan) malfunction.
[LAMP Indicator eleven blinks]
11
Cooling Fan (Rear Fan or Front Fan) malfunction.
[LAMP Indicator twelve blinks]
12
Rear Jack P.C.B. connection error.
[LAMP Indicator thirteen blinks]
13
Abnormal Lamp input voltage (+26V)
Normal: +26V
Abnormal: less than +20V
Possible Solution
1. Try to turn on the power several times. (Wait 5 minutes before retrying.)
2. If still NG, replace the Lamp Unit.
1. Try to turn on the power several times. (Wait 5 minutes before retrying.)
2. If still NG, replace the Lamp Unit.
1. Relocate the unit to a proper location.
Keep the unit at least 100 mm (4") away from the wall to provide proper ventilation
because warm air is discharged. Blocking the ventilation opening of the cooling fan may
damage the unit.
2. Wait until the Lamp has cooled off (approximately 1 hour) and try to turn on the power several times.
3. If still NG, check whether the Fans rotate normally.
4. If still NG, replace the Lamp Unit.
1. Try to turn on the power several times. (Wait 5 minutes before retrying.)
2. If still NG, check that the cable between CN6005 on the Main P.C.B. and Lamp Unit is
connected firmly.
1. Check that Connector CN2753 on the Rear Jack P.C.B. is connected firmly.
2. If still NG, replace the Lamp Fan.
1. Check that Connector CN2754 on the Rear Jack P.C.B. is connected firmly.
2. If still NG, replace the OPT/TV Unit (Fan Case Unit (OPT Fan)).
1. Check that Connector CN2751 or CN2752 on the Rear Jack P.C.B. is connected firmly.
2. If still NG, check whether the Front Fan or Rear Fan stopped and replace it.
1. Check that Connector CN2752 or CN2751 on the Rear Jack P.C.B. is connected firmly.
2. If still NG, check whether the Front Fan or Rear Fan stopped and replace it.
1. Check that Connector CN3501 on the Rear Jack P.C.B. is connected into Connector
CN3001 on the Main P.C.B. firmly.
1. Try to turn on the power several times. (Wait 5 minutes before retrying.)
2. If still NG, check that Connector CN1 and CN151 on the RF AMP Power Supply P.C.B. are
connected firmly.
3. If still NG, unplug the AC Cord and disconnect CN151 connector cable and check
voltage at Pin 1, 2 or 3 of CN151 on the RF AMP Power Supply P.C.B. See Figure a.
If OK (+26V), replace the Lamp Unit.
If NG, check the voltage between Pin 1 and Pin 2 of CN1 on the RF AMP Power Supply P.C.B.
If OK (AC120V), replace the RF AMP Power Supply P.C.B.
If NG, replace the Power P.C.B.
27
PT-56LCX70 / PT-61LCX70 / PT-50LCX7 / PT-56LCX7 / PT-61LCX7
(Note: They are same Fan.)
(Note: They are same Fan.)