Defect Of The Key Board Unit - Panasonic VL-SV75 Series Service Manual

9.2.7 Defect of the Key board unit
START
Is the voltage of
CL1001 about 5V?
YES
Is the voltage of
CL1006 about 3.3V?
YES
Does the screen change in
response to key touch?
YES
END
Reference:
• (*1) [10.1.3 How to Remove the Main Board, Speaker and LCD
Confirm that the CL 910 of the
main board becomes 5 V.
YES
NO
Is the cable connected to
CN 701 and CN 1001?
NO
Check around IC1001,
C1003,C1004 and C1009.
Check around IC1002,R1001,
NO
R1002,R1010〜R1013,
C1008〜C1011 and L1001.
- 36 -
NO
Connect the cables correctly.
Replace the
fault parts.
Replace the
fault parts.
YES
Does the screen change in
response to key touch?
NO
Replace the Key board. (*1)
[No.3]].
NO