EK-620U/EK-621W
3-4
3-4 Power Troubleshooting
Power Troubleshooting
Check LED
STATUS
Status LED
steady light red
Make sure all connectors are
connected properly
Move the projector to
a cooling location
Is problem
solved?
No
Replace the
thermal switch
Status LED flashing red
Measure voltage
J29~J38 Pin1
=4.5~12V±0.3V?
Replace according fan or
blowerWhose pin2 is 3.3V
before status LED lights?
Continue function test
and refer to other
troubleshooting
Replace M/B
No
Is problem
solved?
No
Replace M/B
No
Light LED off status
LED flashing green
Measure voltage
J48 Pin1=5V?
Replace LD
driver board
No
Yes
Measure voltage
J25 Pin1=5V?
Yes
ReplaceM/B
No
Replace photo
sensor
Yes
Yes
Yes