TX-P50U20B, TX-P50U20E, TX-PR50U20 - Panasonic Plasma Service Manual (repair manual). Page 2

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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 CI Plus, DTCP-IP and

One-to-One ------------------------------------------------ 10

6 Service Mode ----------------------------------------------------- 11

6.1. How to enter into Service Mode ---------------------- 11
6.2. Option - Mirror--------------------------------------------- 13
6.3. Service tool mode---------------------------------------- 13
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. No Power--------------------------------------------------- 20
7.4. No Picture -------------------------------------------------- 21
7.5. Local screen failure-------------------------------------- 22

8 Service Fixture & Tools --------------------------------------- 23

8.1. SC jig -------------------------------------------------------- 23

9 Disassembly and Assembly Instructions--------------- 24

9.1. Remove the Rear cover -------------------------------- 24
9.2. Remove the AC inlet ------------------------------------ 24
9.3. Remove the P-Board------------------------------------ 24
9.4. Remove the Side terminal cover and the Side

shield metal ------------------------------------------------ 24

9.5. Remove the Tuner unit --------------------------------- 25
9.6. Remove the A-Board------------------------------------ 25
9.7. Remove the Speakers ---------------------------------- 25
9.8. Remove the SU-Board---------------------------------- 25
9.9. Remove the SD-Board---------------------------------- 26

9.10. Remove the SC-Board---------------------------------- 26

9.11. Remove the SS2-Board -------------------------------- 26

9.12. Remove the SS-Board---------------------------------- 26
9.13. Remove the Hanger metals and the Stand

brackets----------------------------------------------------- 27

9.14. Remove the C1-Board ---------------------------------- 27
9.15. Remove the C2-Board ---------------------------------- 27
9.16. Remove the C3-Board ---------------------------------- 27
9.17. Remove the S-Board------------------------------------ 28
9.18. Remove the Plasma panel section from the

Cabinet assy (glass)------------------------------------- 28

9.19. Remove the Glass holders ---------------------------- 29
9.20. Remove the K-Board------------------------------------ 29
9.21. Replace the plasma panel ----------------------------- 29

10 Measurements and Adjustments -------------------------- 30

10.1. Adjustment------------------------------------------------- 30

11 Block Diagram --------------------------------------------------- 35

11.1. Main Block Diagram ------------------------------------- 35
11.2. Block (1/4) Diagram ------------------------------------- 36

11.3. Block (2/4) Diagram ------------------------------------- 37
11.4. Block (3/4) Diagram ------------------------------------- 38
11.5. Block (4/4) Diagram ------------------------------------- 39

12 Wiring Connection Diagram -------------------------------- 41

12.1. Caution statement. -------------------------------------- 41
12.2. Wiring (1) -------------------------------------------------- 41
12.3. Wiring (2) -------------------------------------------------- 42

13 Schematic Diagram -------------------------------------------- 43

13.1. Schematic Diagram Note ------------------------------ 43
13.2. P-Board (1/3) Schematic Diagram ------------------ 44
13.3. P-Board (2/3) Schematic Diagram ------------------ 45
13.4. P-Board (3/3) Schematic Diagram ------------------ 46
13.5. A-Board (1/19) Schematic Diagram----------------- 47
13.6. A-Board (2/19) Schematic Diagram----------------- 48
13.7. A-Board (3/19) Schematic Diagram----------------- 49
13.8. A-Board (4/19) Schematic Diagram----------------- 50
13.9. A-Board (5/19) Schematic Diagram----------------- 51

13.10. A-Board (6/19) Schematic Diagram----------------- 52

13.11. A-Board (7/19) Schematic Diagram----------------- 53

13.12. A-Board (8/19) Schematic Diagram----------------- 54
13.13. A-Board (9/19) Schematic Diagram----------------- 55
13.14. A-Board (10/19) Schematic Diagram --------------- 56
13.15. A-Board (11/19) Schematic Diagram --------------- 57
13.16. A-Board (12/19) Schematic Diagram --------------- 58
13.17. A-Board (13/19) Schematic Diagram --------------- 59
13.18. A-Board (14/19) Schematic Diagram --------------- 60
13.19. A-Board (15/19) Schematic Diagram --------------- 61
13.20. A-Board (16/19) Schematic Diagram --------------- 62
13.21. A-Board (17/19), K-Board and S-Board

Schematic Diagram ------------------------------------- 63

13.22. A-Board (18/19) Schematic Diagram --------------- 64
13.23. A-Board (19/19) Schematic Diagram --------------- 65
13.24. C1-Board Schematic Diagram ----------------------- 66
13.25. C2-Board (1/2) Schematic Diagram ---------------- 67
13.26. C2-Board (2/2) Schematic Diagram ---------------- 68
13.27. C3-Board (1/2) Schematic Diagram ---------------- 69
13.28. C3-Board (2/2) Schematic Diagram ---------------- 70
13.29. SC-Board (1/4) Schematic Diagram ---------------- 71
13.30. SC-Board (2/4) Schematic Diagram ---------------- 72
13.31. SC-Board (3/4) Schematic Diagram ---------------- 73
13.32. SC-Board (4/4) Schematic Diagram ---------------- 74
13.33. SS-Board (1/2) Schematic Diagram ---------------- 75
13.34. SS-Board (2/2) and SS2-Board Schematic

Diagram ---------------------------------------------------- 76

14 Printed Circuit Board------------------------------------------ 77

14.1. P-Board ---------------------------------------------------- 77
14.2.  K, S and SS2-Board ----------------------------------- 80
14.3. A-Board ---------------------------------------------------- 81
14.4. C1-Board--------------------------------------------------- 83
14.5. C2-Board--------------------------------------------------- 84
14.6. C3-Board--------------------------------------------------- 85
14.7. SC-Board -------------------------------------------------- 86
14.8. SS-Board -------------------------------------------------- 88

15 Exploded View and Replacement Parts List----------- 91

15.1. Exploded View and Mechanical Replacement

Parts List --------------------------------------------------- 91

15.2. Electrical Replacement Parts List ------------------- 99