Elo TouchSystems ET1587C - d. NOISE

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b. LED FLASHING
Stop
No
LED Flashing
Check
H. Driver T.R.
?
Change
H-Driver T.R.
BAD
Check
DC-DC
Circuit
?
Check
Output to GND
Shorting
?
Check
D622
?
Change
Q516,Q514,Q515
BAD
PAD or Trace
Shorting
Yes
Good
Good
Yes
Check
Feed back
Circuit
Change bad
component
No