Usb Part Troubleshooting - LG MCV902 Service Manual

2. USB PART TROUBLESHOOTING

TURN ON USB
"CHECKING" OR
"USB" DISPLAY CHECK
READING OK CHECK
IF PLAY, AUDIO
OUTPUT CHECK
OK
YES
YES
YES
YES
NO
CONNECTOR CHECK
(PN805, CN806, PN810 )
CHECK POWER SUPPLY CIRCUIT(CN806)
CHECK MICOM INTERFACE CIRCUIT(PN805)
PIN13 : RX (IC805 PIN49 : TXD)
PIN14 : TX (IC805 PIN33 : RXD)
NO
CHECK PN810 1PIN : 5V
CHECK PN810 PIN2(D-), 3(D+)
CHECK OTI6888 (IC805)
NO
CHECK SIGNAL STCK, STREQ, STDATA
STCK : IC805 PIN52, IC801 PIN55
STREQ : IC805 PIN53, IC801 PIN54
STDATA : IC805 PIN54, IC801 PIN56
CONNECTOR CHECK (CN806)
4-9
NO
NO
NO
NO
NO