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LG CRD-8483B Service Manual page 4

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3. Troubleshooting Guide
A. LED doesn't light.
Check Power Voltage (TP1:3.3V, TP2:12V)
Reference Voltage
[TP5:VREF(2V), TP6:V2REF(4V) and GND.]
Does "H" output in IC501 pin
Check and replace R705, R706, Q701
and LED701 (LED703 for DELL).
A-1
Is the CLOCK Frequency of IC501 pin
33.86MHz?
Check and replace IC501.
NG
OK
NO
?
21
YES
NO
54
YES
Check the power input
pattern.
Is the CLOCK Frequency of
IC501 pin
33.86MHz?
54
YES
Check IC501.
Check and replace
X501; 33.86MHz.
NO
A-1
23

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