LG 42PQ30 Training Manual page 67

Y - Drive PWB Buffer Troubleshooting
Y - Drive PWB Buffer Troubleshooting
CHECKING THE Y CHECKING THE Y
Disconnected from the Y
Disconnected from the Y
Readings from Floating Ground (Pin 1)
Y Drive Sig
12.) VSC
Y Drive Sig
11.) VSC
10.) nc
9.) FG+5V
8.) FG+5V
Floating Gnd
7.) SUS Dn
6.) CLK
5.) LE
4.) OC1
3.) Data
2.) nc
Floating Gnd 1.) SUS Dn
- - DRIVE PWB DRIVE PWB
- SUS PWB
- SUS PWB
RED LEAD
Blk Lead FG
1.15V
1.15V
Open
0.4V
0.4V
0V
0.5V
0.5V
0.5V
0.62V
0.48V
0V
Meter in the Diode Mode
BLACK LEAD
Red Lead FG
Open
Open
Open
Open
Open
0V
2.9V
2.9V
Open
Open
Open
0V
67
P104 OF THE P207 OF THE
Y-DRIVE PWB Y-DRIVE PWB
Pin 1 Pin 1 on Y-SUS
is backwards
Floating
compared to
Ground
Preliminary Information 42PQ30
Y-Drive