Electrical Instructions - Philips 170B4BB Service Manual

2.3 Allowed 85 Hz overscan signal mode specified
Once the signal input of PC is 85Hz, this monitor is able to display
at least for 10 minutes . An attention signal appears and shows
"This is 85Hz overscan for 5 seconds, change computer display
input to 1280*768 @ 60 Hz
Dot rate (MHz) H.freq (KHz)
36.000 43.269
56.250 53.674
94.500 68.677
3. Power Supply
3.1 Setup the AC I/P at 90VAC, add 2.6A loading to C2117 and
DC output voltage is 3.3V +/- 0.165V DC.
1A loading to C2119 and DC output voltage is 5V +/- 0.5V. (B).
3.2 DC setting
3.01 Detach 8052 to the scaler board before testing the function.
3.02 Apply 12V DC voltage to 1105.
3.03 Connect inverter board to 8051
3.04 Check voltage at C2003 should be within the range
3.3V +/- 0.165V DC. (B)
4. Display Adjustment
4.1Input signals check
In factory mode, use 64 gray level and set the R,G,B gain to 100%.
4.2 Display quality test
Use timing mode as describe in 2.2, and use the pixel on / off
pattern to adjust the clock until no stripe and adjust the phase
until clear picture.
Check all pre-setting 29 modes.
4.2.1 SOG mode test : Use following timing for SOG test
47.7 KHz/60Hz, 1280 X 768, pixel=80.136 MHz
Horizontal
Frame border = 0
Total size = 20.964 ms
Display size = 15.973 ms
Rear porch = 2.496 ms
Sync width = 1.697 ms
Sync polarity = -
4.3 Check of WHITE-D (B)
Apply a 1024*768 / 60Hz signal with white pattern, set brightness
control at 100%, and contrast control at 70%. Adjust the R,G,B sub_gain,
for the screen center,
the 1931 CIE chromaticity (X, Y) co-ordinates shall be;
9300°K
x (center) 0.281 ± 0.020
y (center) 0.311 ± 0.020
Use Minolta CA-110 for color coordinates and luminance check.
Luminance : 380 Nits in the center of the screen when brightness at
100% and contrast set to 100%.
4.4 Check the digital interface
Check the 64 gray level color poor & noise condition.
Electrical Instructions (Continued)
Mode Resolution V.freq (Hz)
VESA 640 * 480 85.008
VESA 800 * 600 85.061
VESA 1024 * 768 84.997
(B)
(B)
Vertical
Frame border = 0
Total size = 16.667 ms
Display size = 16.101 ms
Rear porch = 482.18 ms
Sync width = 62.893 ms
Sync polarity = +
6500°K
0.312 ±
0.020
0.338 ± 0.020
TIMING FOR 170B4 TFT SXGA COLOR LCD MONITOR
(VESA monitor timing standard Version 1.0 Release 0.7)
REFERENCE PATTERN GENERATOR : QuantumData 802G
Please refer to General product specification for detail timings.
29
170B4&S4
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