LG MAX220UB Service Manual page 11

1A [OPTIONAL]
Not available to Remocon?
YES
Checked the
Remocon Sense VDD?
YES
Checked the
Remocon Sense line?
YES
OK
1B
Not available to Volume control?
YES
Checked the
Encoder volume?
YES
Checked the
Volume IC control?
YES
OK
1C
Not available to Key control?
YES
Checked the
Tact switch?
YES
Checked the
Key line?
YES
OK
NO
NO
R962, IC401(7), CN402(11)
NO
EV901, IC401(6, 68), CN402(14, 15)
NO
IC401(31, 32), IC601(25, 26)
NO
SW901 ~ SW907, SW909 ~ SW912
NO
IC401(15, 16), CN402(7, 8)
2-2
RC902, R961