LG MDD64K Service Manual page 22

10. AUX FUNCTION PART CHECK
FUNCTION CHECK
YES
Each function
(tuner/tape/portable)
output to IC200(BU4052)
input : L/R_CH
YES
Check
IC200 (BU4052)
pin3,13 each function
output
YES
Check IC801
(MC4580)
pin1,7 output
YES
Check P7501
pin6(L-CH), pin8(D-CH)
YES
Check
IC201 (AK5358)
pin1,2 input
YES
Check
IC201 (AK5358)
pin9 data
output
YES
Check IC501(ES8390)
pin55 input data
YES
Check IC501(ES8390)
output data
YES
OK
Check
NO
IC200 (BU4052)
pin7:-12V
pin16:+12V
Each function
output line check
Check
NO
IC801 (MC4580)
pin4:-12V
pin8:+12V
Refer to SMPS
troubleshooting
NO
Check P201 connection
Check IC201
NO
pin6:+12V
pin7:+3.3V
Check IC201
pin13:RST, pin11:MCLK, pin9:
3-7
NO
YES
YES
NO
YES
YES
Check P7905 connection
after replace IC200
Check CN202 pin4,5:+5V
pin11,12: +3.3V