Chapter 4 Troubleshooting - Acer B223W Service Manual

Troubleshooting
This chapter provides troubleshooting information for the B223W:
1. No Power
Measure U701 Pin2=3.3V and U702 PIN2=1.8V
No power
Press power key and look if the
picture is normal
NG
Please reinsert and make sure the
5V and 12V input is normal
OK
OK
Check X201 oscillate waveforms
are normal
OK
Check U202
NG
Reinsert or check the
power section
Check
NG
replace U701,U702
NG
Replace X201
31
CN401 or
Chapter 4