LG 42PG20 - Page 75

75
Plasma Fall 2008 42PG20
Using the “Diode Test” on the DVM, check
the pins for shorts or abnormal loads.
Y Drive BUFFER Troubleshooting
Y Drive BUFFER Troubleshooting
RED LEAD ON
BUFFER IC
BLACK LEAD ON “ANY”
OUTPUT LUG.
READING 0.73 V
OUTPUT LUGS
BLACK LEAD ON
BUFFER IC
RED LEAD ON “ANY”
OUTPUT LUG.
READING “OPEN”
YOU CAN CHECK ALL 8 BUFFER ICs USING THIS PROCEDURE
YOU CAN CHECK ALL 8 BUFFER ICs USING THIS PROCEDURE
• Any of these output lugs can be tested.
• Look for shorts indicating a defective Buffer IC
Indicated by white outline
BACK SIDE OF Y-DRIVE PWB
Indicated by white outline
+
-
+
-
Floating
Ground