Panasonic PT-52LCX66-K Service Manual page 31

How to solve problems indicated by the Error Indication of LED
(The symptom of all errors is that Lamp goes off or Lamp does not light up)
Note: Before performing the troubleshooting, confirm that all connector cables in the unit are connected correctly.
Error
Problem
No.
11) Mis-installed Lamp Cover
(the Lamp cover is open).
12)
1. +17V line on the LCD Drive P.C.B. error.
2. +9V line on the LCD Drive P.C.B. error.
3. +5V line on the LCD Drive P.C.B. error.
Possible Solution
1. Check the Cover Switch P.C.B. If still NG, install the Lamp Cover Unit properly.
2. If still NG, check the following parts on Lamp Cover Open (H) signal line on the Main P.C.B.,
and replace if necessary.
• LVDS Cable between the Main P.C.B. and the LCD Drive P.C.B.
• IC6001, R6231, and the surrounding parts (Main P.C.B.).
• SW2911 (Cover Switch P.C.B.)
1. Disconnect Connector CN2704 on the LCD Drive P.C.B.
Turn the unit power on, check the voltage at pins of cable connector from the Main P.C.B.
• Pin1: approx. +17V
• Pin2: approx. +9V
• Pin3: approx. +5V
• Pin4: approx. +3.3V
If NG, refer to "CHECKING THE MAIN P.C.B."
2. If OK, peform the following steps:
1) +17V line on the LCD Drive P.C.B. error
Check IC2301, R2317, and the surrounding parts (LCD Drive P.C.B.).
2) +9V line on the LCD Drive P.C.B. error
Check IC2301, R2318, and the surrounding parts (LCD Drive P.C.B.).
3) +5V line on the LCD Drive P.C.B. error
Check IC2301, R2308, and the surrounding parts (LCD Drive P.C.B.)
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PT-52LCX66-K / PT-56LCX16-K / PT-61LCX66-K