LG HCS6000A Service Manual page 16

(D) CS check
YES
Logic low pulse is seen at R138?
Fig.05
YES
Logic low pulse is seen at R140?
YES
Logic low pulse is seen at R144?
YES
Logic low pulse is seen at R143?
NO
NO
NO
NO
Fig.05 R138(1) : Flash CS signal
3-6
Check IC101, 104, 105
Check IC101, IC211
Check IC101, IC400
Check IC101, IC201