Panasonic TH-L55WT50M, Service Manual, Page: 2 / 84

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TABLE OF CONTENTS
PAGE PAGE
1 Safety Precautions ----------------------------------------------- 3
1.1. General Guidelines ----------------------------------------3
1.2. Touch-Current Check--------------------------------------3
2 Warning -------------------------------------------------------------- 4
2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostatically Sensitive (ES) Devices ----------4
2.2. About lead free solder (PbF) ----------------------------5
3 Service Navigation ------------------------------------------------ 6
3.1. PCB Layout--------------------------------------------------6
3.2. Applicable signals------------------------------------------7
4 Specifications ------------------------------------------------------ 8
5 Technical Descriptions ---------------------------------------- 10
5.1. Specification of KEY for DTCP-IP, One-to-
One, Widevine and Netflix ----------------------------- 10
6 Service Mode ----------------------------------------------------- 11
6.1. How to enter into Service Mode ---------------------- 11
6.2. Service tool mode---------------------------------------- 13
6.3. DRV Check - USB HDD Check----------------------- 14
6.4. Hotel mode------------------------------------------------- 14
6.5. Data Copy by SD Card --------------------------------- 15
7 Troubleshooting Guide ---------------------------------------- 18
7.1. Check of the IIC bus lines------------------------------ 18
7.2. Power LED Blinking timing chart --------------------- 19
7.3. LCD Panel test mode ----------------------------------- 19
8 Disassembly and Assembly Instructions --------------- 20
8.1. Disassembly Flow Chart for the Unit ---------------- 20
8.2. Disassembly Procedure for the Unit----------------- 20
9 Measurements and Adjustments -------------------------- 33
9.1. Voltage chart of A-board------------------------------- 33
10 Block Diagram --------------------------------------------------- 35
10.1. Main Block Diagram ------------------------------------- 35
10.2. Block (1/2) Diagram ------------------------------------- 36
10.3. Block (2/2) Diagram ------------------------------------- 37
11 Wiring Connection Diagram --------------------------------- 39
11.1. Caution statement.--------------------------------------- 39
11.2. Wiring 1 ----------------------------------------------------- 39
11.3. Wiring 2 ----------------------------------------------------- 40
11.4. Wiring 3 ----------------------------------------------------- 41
11.5. Wiring 4 ----------------------------------------------------- 42
11.6. Wiring 5 ----------------------------------------------------- 43
12 Schematic Diagram --------------------------------------------- 45
12.1. Schematic Diagram Note ------------------------------ 45
12.2. A-Board (1/16) Schematic Diagram ----------------- 46
12.3. A-Board (2/16) Schematic Diagram ----------------- 47
12.4. A-Board (3/16) Schematic Diagram ----------------- 48
12.5. A-Board (4/16) Schematic Diagram ----------------- 49
12.6. A-Board (5/16) Schematic Diagram ----------------- 50
12.7. A-Board (6/16) Schematic Diagram ----------------- 51
12.8. A-Board (7/16) Schematic Diagram ----------------- 52
12.9. A-Board (8/16) Schematic Diagram ----------------- 53
12.10. A-Board (9/16) Schematic Diagram ----------------- 54
12.11. A-Board (10/16) Schematic Diagram --------------- 55
12.12. A-Board (11/16) Schematic Diagram---------------- 56
12.13. A-Board (12/16) Schematic Diagram --------------- 57
12.14. A-Board (13/16) Schematic Diagram --------------- 58
12.15. A-Board (14/16) Schematic Diagram --------------- 59
12.16. A-Board (15/16) Schematic Diagram --------------- 60
12.17. A-Board (16/16) Schematic Diagram --------------- 61
12.18. K-Board Schematic Diagram ------------------------- 62
12.19. LD-Board Schematic Diagram ----------------------- 63
12.20. LP-Board Schematic Diagram------------------------ 64
13 Printed Circuit Board ------------------------------------------ 65
13.1. A-Board ---------------------------------------------------- 65
13.2. K-Board ---------------------------------------------------- 67
13.3. LD-Board--------------------------------------------------- 68
13.4. LP-Board--------------------------------------------------- 69
14 Exploded View and Replacement Parts List ----------- 71
14.1. Exploded View and Mechanical Replacement
Parts List --------------------------------------------------- 71
14.2. Electrical Replacement Parts List ------------------- 74