Elo TouchSystems ET1587C - SERVICE COMPONENTS; RESISTOR; CAPACITOR

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5. During mode change, there is a noise picture appear on screen
Note: Pin 16 from U601 is mute signal , active low.
Check power
No
Check
pin 5 from
U101=5V
Yes
END
Put the probe on the pin16 at U101
END
During a mode change, check if pin 16
turn to low state for a while, around /
second
NO
Change CPU
Yes
Check
the transistor be
hind pin 16 was
broken?
END