Cpu(System Control) Troubleshooting - LG LST-5600A Service Manual

2. CPU(SYSTEM CONTROL) TROUBLESHOOTING

Start
Power is supplied normally?
Clock signals are OK?
Reset signals are OK at the time of
power-on reset?
Chip selection signals are OK?
IIC channels are OK?
Interrupt signals are OK?
Messages are output through
RS-232C port on PC terminal?
END
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
3-4
(A) Power check
(B) Clock check
(C) Reset check
(D) CS check
(E) IIC check
(F) Interrupt check
(G) RS-232C check