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:'13/Dec
8. Implementing countermeasure to defective parts
■Input of 12V-voltage to the panel
Is approx. 12 V-voltage input to the 14th pin on IC2500 14th
pin?
No
See "1 THE POWER IS NOT SUPPLIED (THE LED DOES
NOT LIGHT UP)".
■Input of 24V-DC
Is approx. 19.5 V-voltage input to the IC2500 15th pin ?
No
See "1 THE POWER IS NOT SUPPLIED (THE LED DOES
NOT LIGHT UP)".
■Input of 12V-voltage to the speaker
Is approx. 12 V-voltage input from the connector to the 9th
pin on IC2500?
No
Is the F3200 blown out?
No
Disconnect the harness and see if approx. 12 V-voltage is
input to the connector (CN3200) 11th pin on Main power
supply unit.
No
See "1 THE POWER IS NOT SUPPLIED (THE LED DOES
NOT LIGHT UP)".
■Input of 5V-voltage to the Main power supply unit
Is approx. 5 V-voltage input from the connector to 9th pin on
IC2500?
No
Is the F3200 blown out?
No
Disconnect the harness and see if approx. 5 V-voltage is
input to the connector (CN3200) 8th and 9th pin on Main
power supply unit.
No
See "1 THE POWER IS NOT SUPPLIED (THE LED DOES
NOT LIGHT UP)".
■Backlight (LED error)
Does the backlight light up?
No
Check the log data and specify the type of error.
Is it Open error?
No
Check the log data and specify the type of error.
Is it thermal shutdown?
No
Replace LED driver PWB unit.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Is there any ununiformity in brightness toward
vertical direction?
No
Any defect with cable?
No defect found.
Replace the LCD module.
Yes
Replace LED driver PWB unit.
Yes
Any problem with installation environment?
No
Ensure a good installation environment.
PN-K321/K322B TROUBLESHOOTING 7 - 5
R3224 or R3225 or IC2500 may have defect.
Replace the abnormal part.
R3200 or R3201 or IC2500 may have defect.
Replace the abnormal part.
R3200 or R3201 or IC2500 may have defect.
Replace the abnormal part.
Replace F3200.
Replace the Main I/F PWB.
R3204 or R3205 or IC2500 may have defect.
Replace the abnormal part.
Replace F3201.
Replace the Main I/F PWB.
Yes
Replace LED power unit.
Defect found.
Replace the abnormal part.
Yes
Replace LED driver PWB unit.
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