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No pulse
Check Reset CKT
ViewSonic Corporation
Yes
Check Reset
waveform when
power on
A pulse to > 3V
Check if O/P
short to GND
No
Check if MCU
pin short or bend
No
Check if socket
pin bend
No
If input over
MCU 3.3+0.3V
No
MCU bad
MCU
B
MCU not
programmed
No
Crystal no
OSC
No
MCU 3.3V
=3.0~3.6V
No
Check DC 3.3V CKT
Yes
Reflow
Yes
Check 4 corner are shorted
or not
Yes
Be carefully when using
probe to measure
Yes
Not allowed
11
Yes
Re-programming
(1)MCU not put well
(2)Crystal bad
Yes
(3)Cap of crystal
too big/small
Change socket
Confidential - Do Not Copy
VG510b/s
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