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PD BOARD DIAGNOSIS
1.
General PD board Diagnosis
Disconnect the wire between PD board and Main board.
Short Circuit 16pin and 18pin of CNM801 ▶ If the BLU on , we can consider PD board is acting correctly.
2.
LED Driver output diagnosis
Measure voltage at CD9113, CD9213, CD9313, CD9413 which are criteria for judgement.
46" LED Driver output for judgement
Voltage at the CD9113
Judgement
Voltage at the CD9213
Judgement
Voltage at the CD9313
Judgement
Voltage at the CD9413
Judgement
55" LED Driver output criteria for judgement
Voltage at the CD9113
Judgement
Voltage at the CD9213
Judgement
Voltage at the CD9313
Judgement
Voltage at the CD9413
Judgement
17~19V
Bottom right panel driver of the
PD Board is out of order.
17~19V
Top right panel driver of the PD Board
is out of order.
17~19V
Top left panel driver of the PD Board is
out of order.
17~19V
Bottom left panel driver of the PD
Board is out of order.
23~25V
Bottom right panel driver of the
PD Board is out of order.
150~170V
Top right panel driver of the PD Board
is out of order.
150~170V
Top left panel driver of the PD Board is
out of order.
150~170V
Bottom left panel driver of the PD
Board is out of order.
19V~30V
PD board is acting
Bottom Right LED Bar
normally.
19V~30V
PD board is acting
Top Right LED Bar is
normally.
19V~30V
PD board is acting
Top left LED Bar is out
normally.
19V~30V
PD board is acting
Bottom left LED Bar is
normally.
27~36V
PD board is acting
Bottom Right LED Bar
normally.
224~284V
PD board is acting
Top Right LED Bar is
normally.
224~284V
PD board is acting
Top left LED Bar is out
normally.
224~284V
PD board is acting
Bottom left LED Bar is
normally.
4. Troubleshooting
38V~41V
is out of order.
38V~41V
out of order.
38V~41V
of order.
38V~41V
out of order.
49~52V
is out of order.
340~380V
out of order.
340~380V
of order.
340~380V
out of order.
4-27
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