LG 42PW350 - Y-SUS Floating Ground (FG 15 V, FG 5 V) and 18 V Checks and Test; Floating Ground Voltage Checks

Y-SUS Floating Ground (FG 15V, FG 5V) and 18V Checks and Test
TIP: Some Circuit components are on the back of the board. To Test these voltages, remove the board completely,
supply Ground and any 5V supply Y-SUS. Ground OE Jumper J73.
Floating Ground checks must be made from Floating Ground.
Use any pin on P213.
These voltages are generated when the M5V arrives on the board.
FG 15V J66
D506 Cathode
Run: 18.2V
Diode Check
1 13V
D506 18.2V
FG 5V J54
1
.
13V
Location
T502
J73 OE
Location Back Side of Board
Source FG15V (Floating Ground 15V) D508 cathode.
Source FG5V (Floating Ground 5V) FG15V
i l t d d t 5V b IC508
Must be grounded to test FG5, FG15V
June 2011 42PW350 Plasma
96
i
s regu
l
a
t
e
d
d
own
t
o
5V
b
y
IC508
.
and 18V with only 5V applied to board.