External Inspection On The Lcd Module; External Inspection Of The Display Surface; Inspection Items; Inspection Standards - NEC MultiSync LCD1550ME Service Manual

2. External inspection on the LCD module

2.1. External inspection of the display surface

The display surface shall be visually inspected according to the inspection items specified below. In cases
of the discovery of extreme defects or doubtful judgment, final judgment should be made on the basis of
relevant detailed standards for inspection.
Unless otherwise specified, the inspection signals shall be used at the timing of Signal 17 specified in
Paragraph 1.2.8 herein.

2.1.1. Inspection items

1) Examination of the missing of lines (horizontal or vertical lines failing to be displayed).
2) Presence of extreme missing of dots (bright dots and black dots), or conspicuous ones.
3) Presence of extreme flaws, wrinkles, air bubble, dents, lint, foreign matter, and conspicuous
abnormality on the display surface.

2.1.2. Inspection standards

Inspection standards for external appearance and display conditions
(1) Inspection condition
a) Viewing distance is approximately 385cm.
b) Ambient illuminant is from 300 to 500lux.
c) Viewing angle is +/- 10 deg.
d) Ambient temperature is approximately 25deg C.
e) Input signal clock frequency: 40MHz.
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