Open Close Ng; Reading " Display Check (= Only "Cd" Display) - LG FA162 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE OF CD PART

3. OPEN CLOSE NG

Check connector locking.
(CN403)
YES
Check voltage
IC401 (S3053)
Pin8, 19: 5 V
YES
Check
voltage IC401 (S3053)
Pin9: LOAD-,
Pin10: LOAD+
YES
Defective mechanism.

4. " READING " DISPLAY CHECK (= ONLY "CD" DISPLAY)

Check connector locking.
(CN401, CN403)
YES
Check voltage
IC401 (S3053)
Pin8, 19: 5 V
YES
Check voltage
IC804 Pin2: 3.3 V.
YES
Check reset signal
PN805 Pin15: 5 V.
YES
Check μ-com 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 μ-com,
Pin15 DO: from μ-com to DSP
Check the waveform #1
YES
Defective IC801.
NO
Defective Main power supply.
NO
Defective IC401.
NO
Refer to
SMPS troubleshooting.
NO
Defective IC804.
NO
Defective μ-com or connector.
NO
Defective μ-com or connector.
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