Read Sharp LC-28HM2E (serv.man2) Service Manual online
41
LC-28HM2
AN-28SP2
TROUBLE SHOOTING TABLE
(Continued)
System does not star
t up.
No
Does system star
t up in the
process adjustment mode?
Ye
s
“0”
What is
“LAMP NG”
count?
“5”
Replace f
aulty lamp
.
Ye
s
What is the v
oltage at pin (2) of
IC2004?
No
No
Chec
k displa
y side po
w
er unit.
Chec
k pins (3) and (17) of P2001
and its per
ipher
al circuits
.
Is the v
oltage at pin (11) of P2001
measured at 4.2V or higher when
b
lue LED is ON?
Red LED lights up from the
beginning.
Blue LED lights up first, b
ut soon
red LED lights up
.
Ye
s
Is the v
oltage 0V at pin (27) of
IC2004?
3.75~5 V
2~3.75 V
1~2 V
0~1 V
Chec
k system cab
le
.
Nor
mal oper
ation
Chec
k output at pin (21)
of P701.
Chec
k output at pin (3)
of P2001.
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