LG LM-M540 Service Manual page 11

IC501 Troubleshooting
IC501 16PIN power applied check
IC501 2, 3 PIN CLK Data check
CONTROL function check
normal
IC601(TDA7468D) Troubleshooting
IC601 1PIN power applied check
IC601 15,14 Pulse waveform check
(with tunning VOL DIAL)
IC601 7,22 Pin waveform output check
IC601 8,21Pin waveform input check
IC601 12,17Pin waveform output check
normal
Refer to power supply check
IC301 3,4 PIN data check
(When switched to CD, TAPE Function)
IC501 replace
Refer to power supply check
IC301 76,75, 5, 10 Pin check
IC601 replace MICOM(82,83) - IC401(21,22) Pattern check
IC601 replacement
- 2-7 -
Refer to IC301 Troubleshooting
Pattern check between IC301 and IC501
IC301 Troubleshooting