Key Data Input - Samsung GT-B3210 Service Manual

Flow Chart of Troubleshooting

9-7. Key Data Input

Check Initial Operation
Yes
Is it a QWERTY
key?
Yes
When one of the
keys is
pushed, is it
displayed on LCD?
Check
VCCD_2.9V=2.9V?
VCCD_1.9V=1.9V?
Yes
the circuit around
U500
input circuitry
END
No
No
Check the key Fpcb and
QWERTY Dome sheet
Yes
No
Check the
QWERTY Dome
sheet & Key Pad
No
Yes
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When the END
keys is
pushed, is it
displayed on
Check
HDC500
Is it
END
Replace U500
9-18
No
Check Key PBA ass"y
Yes
No
Replace the HDC500
Yes
& Key Pad