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Can not lighten LED
Can not lighten LED
Check if there is any
open-circuit
short-circuit
DuPont pin and PCB
Check
R47/R48/R36/R37/R40/R
41/Q6/Q7/LED1 is normal
Check if VCC and VCC_D is
normal (VCC is always 5V and
VCC_D is 5V when ON and 0
when STANDBY)
Replace the main PCBA or PSU PCBA
Yes
or
on
the
No
whether
Yes
Yes
4-1
Yes
Fix the open-circuit or short-circuit
No
Fix the bad component
No
Fix
Q209/R297/R298R299/R300/Q210
on the main PCBA
Trouble shooting chart
the
PSU
or
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