LG XC102 Service Manual page 46

1-2. "READING" DISPLAY CHECK (= ONLY "CD" DISPLAY)
Conector locking check
(PN802, PN804, PN805, CN806)
Check power
supply port (PN805, CN806)
CN806 PIN1 : 12V, PIN2 : 6.3V,
PIN4 : 5V PN805
PIN8 = 5V_AD
Check voltage
The PIN2 of IC804
IC804 PIN2 : 3.3V
Check reset
signal of PN805
PN805 PIN19 : 5V
Check micom interface circuit (PN805)
PN805 PIN1, 3, 4, 15, 19, 26 signal check
(1 : CE, 3 : DI, 4 : CLK, 15 : D0, 19 : RST,
18 : FSEQ, 26 : WRQ) PIN3 DI : From DSP
to micom PIN15 DO : From micom to DSP
Check the waveform #1
YES
YES
YES
YES
YES
NO
Defective connector or main power supply
NO
Defective IC804
NO
Defective micom or connector
NO
Defective micom or connector
Defective IC801
4-3