LG RHT497H Service Manual page 18

no 5v for hdd &
dvd loader
yeS
is the 5.5v supplied
to ic156 Pin1?
yeS
is the
ic156 Pin4 "h"?
yeS
check or replace ic156
no 12v for hdd &
dvd loader
yeS
is the 13.5v supplied
to ic155 Pin1?
yeS
is the
ic155 Pin4 "h"?
yeS
check or replace ic155
no
check or replace d125
no
check the 'Pwr ctl
"h"' signal from µ-coM
no
check or replace d124
no
check the 'Pwr ctl
"h"' signal from µ-coM
3-3