NEC PX-50XM4 series Service Manual page 258

(4) Wrong lighting
Wrong lighting
The PDP is fault.
(To the separate PDP service manual)
(5) Dark images [Other than the deterioration in brightness as per (1) above]
The images are dark even
with an all-white input
The PDP is fault.
(To the separate PDP service manual)
(6) Defect in horizontal lines
Line defect
The PDP is fault.
(To the separate PDP service manual)
All-black signal
All-black signal
All-white signal
All-white signal
5-11
CONFIDENTIAL
Dot errors change
with no continuity.