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Service Manual
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ViewSonic
VG150
April 1999 - Version 1.0
THEORY OF CIRCUIT OPERATION
H/V Frequency Counter
MTV112E can discriminate HSYNC/VSYNC frequency and saves the information
in XFRs. The 15 bits Hcounter counts the time of 64XHSYNC period, but only 11
upper bits are loaded into the HCNTH/HCNTL latch.
H/V Present Check
Output HBLANK/VBLANK Control and Polarity Adjust
Page 28
(Contidenitial
Do
No'
opy,
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