Philips S42AX-YD02, Service Manual

Page: 77 / 81

Alignments
EN 77 SDI PDP 2K6 8.
8.5 Waveform Alignments 63” HD v4
1. Set the pattern to Full White:
•
Place a jumper on CN2012 on the Logic Board and
switch the display “ON”.
2. Check the waveform using an Oscilloscope.
•
Triggering through V_TOGG of the LOGIC Board (see
Figure “Logic PWB”).
• Connect the “OUT240” test point, located at the centre
of the Y-buffer PWB, to the other channel, and then
check the first Subfield operating waveform of one TV-
Field.
• Check the waveform by adjusting the Horizontal
Division of the oscilloscope.
• Check the Reset waveform when the V_TOGG level is
changed.
3. Adjust the intersection point of the rising ramp with VR5000
(see Figure “Rising ramp waveform adjustment”).
4. Adjust the intersection point of the falling ramp with
VR5001 (see Figure “Falling ramp waveform adjustment”).
Figure 8-23 TCP ramp waveform inclination adjustment (Y-Board)
G_16380_061.eps
181006
W1 Ramp Waveform Inclination Adjustment ( Y-Board )
< Main Reset Waveform>
G G G G G G G G
<Rising Ramp> <Preset>
yš•ŽGyˆ”—
Adjust VR5001 to set the time of Yfr
(Preset) like the below picture.
Oscilloscope Setting : 20V / 40us
Adjust VR5000 to set the time of Yrr
(Main Reset Rising Ramp) like the
below picture.
Oscilloscope Setting : 20V / 40us
w™ŒšŒ›G
\Gi“–Š’G
XGi“–Š’
XGi“–Š’
]Gi“–Š’G
w–•›G–G•›Œ™šŒŠ›–•G
w–•›G–G•›Œ™šŒŠ›–•