Understanding how System Shut Down operates

Июль 30, 2022

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Understanding how System Shut Down operates

Содержание

2. A short circuit on the voltage lines. Over-voltage condition. Abnormality in the Control Drive Pulse circuit
3. D BOARD SOS DETECT
4. DG BOARD SOS DETECT
5. PA Board Test Points
6. PA Board Over Voltage Protection
7. PA Board Loss of Sub-Voltage Protection
8. PA Board Loss of Main-Voltage Protection
9. PA Voltage Output
10. PA SOS Detect Circuit
11. LED BLINKING 10 TIMES When the power LED blinks 10 times right after the Plasma TV
12. How to Rule out the P Board Use a Peak Hold Meter for voltage reading NOTE:
13. To rule out H Board Disconnect connector H40 then plug Plasma TV to AC line. If
14. To rule out the DT (Digital Tuner) Board Remove the DT board and then plug the
15. D Board SOS Detect
16. DG Board SOS Detect
17. DG Board SOS Detect
18. 15V Distribution
19. 15V SOS
20. LED BLINKING 5 TIMES This blinking code is caused by an abnormalities in the 5V voltage
21. 5V Distribution Line
22. 5V SOS
23. Other Cause of 5V SOS The Power LED can also blink 5 times if the Vda
24. 5V & Vda Distribution on the C Board
25. Procedure to properly isolate C Board When the ribbon cables from the D board to the
26. Drive Reset Circuit
27. BT30V (Tuner SOS) Detect Circuit D2663
28. Sound SOS Detect Circuit
29. Digital Temperature Sensor
30. Digital Temperature Sensor
31. Digital Temperature Sensor (continued)
32. Fan SOS
33. Fan SOS To determine if the fan is the cause of the 11 blinks, simply use
34. No Video and No OSD Determining whether a no video or no OSD symptom is caused
35. Isolation of SC & SS Board If any of the connectors providing the 15V or Vsus
36. Isolation of the SC & SS Board
37. Isolation of SC Board
38. SC2, SC23 & SC20 Disconnected In this condition, when the SC2 SC20 & SC23 are disconnected
39. Expectations when isolating SC Board 7
40. Isolation of SC Board Sometimes the TV will go into Shutdown indicating that the problem is
41. Isolation of SC Board
42. Isolation of SU Board
43. Isolation of SD Board
44. Isolation of SS Board
45. Isolation of SS Board
46. Isolation of SS Board
47. Isolation of SS Board SS23 Disconnected on the SS board (No Drive pulses from the D
48. Isolation of SS Board Missing Drive Pulses from the D board SS11 and SS23 Disconnected, but
49. Defective D Board
50. Defective D Board
51. Defective SC Board
52. Defective SC Board
54. Скачать презентацию

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A short circuit on the voltage lines.
Over-voltage condition.
Abnormality in the Control

Drive Pulse circuit i.e.
SC, SS, SU or SD boards.
Missing source voltage to the PA board (STB14V) from
P board.
Missing output voltage from the PA board to the DG board.
Missing 15V or Vsus on either SS or SC board while the control drive pulses from the D board are being provided.

Possible causes of shutdown

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D BOARD SOS DETECT

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DG BOARD SOS DETECT

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PA Board Test Points

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PA Board Over Voltage Protection

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PA Board Loss of Sub-Voltage Protection

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PA Board Loss of Main-Voltage Protection

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PA Voltage Output

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PA SOS Detect Circuit

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LED BLINKING 10 TIMES
When the power LED blinks 10 times right

after the Plasma TV has been plugged in to the AC source, the possible defective boards are:

P Board
PA Board
DG Board
H Board
DT Board

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How to Rule out the P Board
Use a Peak Hold Meter

for voltage reading
NOTE: Follow this procedure when the click sound of the relay can be heard after the unit is plugged in. If the relay does not click, check the STB 5V from the P board. If the STB 5V is missing, the P board may be defective. (If STB 5V is OK, the DG board may be defective.
Disconnect Connector P10 on the P board. (Make sure that the TV is unplugged)
Because you only have 2 – 3 seconds to measure the STB14V, place your meter’s probe at pin 1 of connector 10 of the P board before plugging the TV in to the AC line.
Plug the TV in to the AC line while still holding the probe at Pin 1.
Check to see if the 14V comes up. If it does not come up the P board is defective. If it does, (since it may take some involvement to determine which of the PA or DG board is defective) it is OK to order both the PA and DG board together.

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To rule out H Board
Disconnect connector H40 then plug Plasma TV

to AC line.
If the power LED stops blinking, the H board may be defective, otherwise another board is causing the problem.
NOTE: It is recommended that the PA board be replaced at the same time if the H board is suspected to be defective and will be replaced.

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To rule out the DT (Digital Tuner) Board
Remove the DT board

and then plug the Plasma TV into an AC source.
Note: When the DT board is removed, the unit will still power up but all functions are disabled due to the lack of data communication
If the power LED stops blinking the DT may be defective otherwise, another board is causing the problem.
Other possible causes of blinking are the PA or DG board.

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D Board SOS Detect

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DG Board SOS Detect

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DG Board SOS Detect

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15V Distribution

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15V SOS

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LED BLINKING 5 TIMES
This blinking code is caused by an

abnormalities in the 5V voltage supply line.
Other possible cause is a problem in Vda supply voltage line.

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5V Distribution Line

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5V SOS

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Other Cause of 5V SOS
The Power LED can also blink

5 times if the Vda voltage is shorted. This is normally caused by the Panel demultiplexer ICs.

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5V & Vda Distribution on the C Board

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Procedure to properly isolate C Board
When the ribbon cables from

the D board to the C boards are disconnected in order to isolate the C boards, the LED will blink 6 times.
To properly isolate the C boards to avoid 6 blinks, TP9387 (on the D board) should be grounded by a 1Kohm resistor.
Note: The next slide will show reasons why SOS 6 blinks is generated when the ribbon cables are removed.
The Vda connector should also be disconnected.

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Drive Reset Circuit

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BT30V (Tuner SOS) Detect Circuit
D2663

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Sound SOS Detect Circuit

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Digital Temperature Sensor

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Digital Temperature Sensor

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Digital Temperature Sensor (continued)

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Fan SOS

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Fan SOS
To determine if the fan is the cause of

the 11 blinks, simply use a peak hold meter to determine if pin 3 of the fan connector goes high before shutdown.
If it does, the fan is defective.
If not, check the other fans and the fan drive circuitry.

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No Video and No OSD
Determining whether a no video or no

OSD symptom is caused by the
video process or the panel drive circuit

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Isolation of SC & SS Board
If any of the connectors

providing the 15V
or Vsus voltage to the SC or SS board is
disconnected, while the connectors providing
the scan and sustain drive pulses are present
coming from the D board, the Plasma TV will
shutdown.

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