Power Troubleshooting - Eiki EK-620U Service Manual

3-4 Power Troubleshooting

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