LG MCD23 Service Manual page 20

10. TUNER/TAPE/PORTABLE 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(R-CH).
YES
Check
IC805 (AK5358A)
PIN1,2 INPUT.
YES
Check
IC805 (AK5358A)
PIN16 data output.
YES
IC801(MLC3890)
PIN55 INPUT DATA.
YES
IC801(MLC3890)
DADATA0 OUTPUT.
YES
OK
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Check
IC200 (BU4052)
PIN7:-5.65V
PIN:16:+5.8V
NO
Each function
output line Check.
Check
NO
IC801 (MC4580)
PIN:-12V
PIN:8:+12V
Refer to SMPS.
NO
Check CN801 Connection.
Check IC805
NO
PIN7:+3.3V
PIN6:+5V
Check IC805
PIN13:RST/PIN12:BCK
PIN:11:MCLK/PIN10:LRCK
PIN9:DATA
3-7
NO
YES
YES
NO
YES
NO
YES
Check P7905 connection
After replace IC200.
Check CN202 PIN4,5:+5V
PIN11,12: +3.3V
check CN802
PIN1:DA_DATA/PIN2:DA_BCK
PIN3:DA_LRCK/PIN5:CD_RESET
YES
Replace IC805.
LGE Internal Use Only