LG CED-8042B Manual page 58

LD CHECK (Not Read).
E
Refer to 'F. LD On' of 'How to
use Test Tool (Dragon)'
: 'VRDC Loop [Read Mode]'
Measure LD Power
YES
LD Power 1.2+/-0.4mW?
NO
P/U Pin 32 (LDON)=H?
YES
IC601 Pin 77 (RREF)
: 0.6+/-0.2V?
YES
IC601 Pin 4 (FPDO)
: 2.9+/-0.3V?
YES
P/U Pin 25 (VRDC)
: 0.9+/-0.4V?
YES
Check the cold soldering for the P/U
connector and then replace P/U.
NO
Check the cold soldering for the
R267, IC202.
Re-flash IC202 and then replace IC202.
NO Check the cold soldering for the R544,
R548, R636, IC503
and then replace IC503.
NO Check the cold soldering for the R683, R692,
R696, R697, R686, R614, R618, IC601,
IC607 and then replace IC601, IC607.
Check the cold soldering for the R683, R692,
NO
R696, R697, R686, R614, R618, IC601,
IC607 and then replace IC601, IC607.
Refer to 'D. LD Inspection' of 'How to
use Test Tool (Dragon)'
YES
VWDC NG?
NO
OK
65