Panasonic VL-SV74BX, Service Manual

Page: 35 / 99

9.2.7 Defect of the Key board unit
Is the voltage of
CL1001 about 5V?
Replace the
fault parts.
Replace the
fault parts.
Is the voltage of
CL1006 about 3.3V?
Does the screen change in
response to key touch?
Does the screen change in
response to key touch?
Is the cable connected to
CN 701 and CN 1001?
Check around IC1001,
C1003,C1004 and C1009.
Check around IC1002,R1001,
R1002,R1010
〜
R1013,
C1008 〜 C1011 and L1001.
Confirm that the CL 910 of the
main board becomes 5 V.
Replace the Key board. (*1)
NO
NO
NO
NO
NO
YES
YES
Connect the cables correctly.
NO
YES
YES
YES
END
START
Reference:
• (*1)
[10.1.3 How to Remove the Main Board, Speaker and LCD [No.3]] .
- 35 -