LG 50PC1DR - - 50" Plasma TV Troubleshooting Manual page 18

Troubleshooting Single Scan Panel
-VY too low (-154vdc)
-VY too high (-227vdc)
Plasma Display Panel Troubleshooting - 2007
Panel Waveform Adjustment
Colors and the image will bloom slightly and the unit
will have difficulty with clean frame changes in a quickly
altering image.
The center begins to wash out and arc due to –
VY running to long and clipping.
18