Hitachi 42HDM12 Service Manual page 21

3. No picture
NO PICTURE
impedance
check Vs LINE
OK
impedance
check Va LINE
OK
SW ON
Va:no uprise Vs:no uprise
Vs:down after up Va:down after up
Q303, PC301, Q501,D510,
PC302, D310, Q500,PC501,
etc
NO Vs, Va, Vcc
NG
NG
Open connector
PC502,etc
CN64
impedance
check Va LINE
NG
D351
21
Open connector
CN64
impedance
check Vs LINE
NG
OK
D551, D550
PDP module Va
NG
OK
PDP module Vs
NG