Check Osd,Mcu For No Osd Window - Acer 7299sl Service Manual

4.8 Check OSD, MCU for no OSD window
Check +5V, ok?
(1) IC1901(OSD IC) pin4 ,6,17
Check IC1901 (OSD IC) pin2,3 have DC 1~3V
with oscillation wave?
Check IC1901(OSD IC) pin5(HBNK)&
pin18(V-), ok?
Check SCL, SDA INPUT, ok?
Trouble Shooting
Check OSD, MCU
for no OSD window
Start
YES
YES
YES
No Copy/Reproduction Allowed
NO
NO
NO
NO
API Confidential
Check +5V power
and IC1903
Check
pin 2,3
and the R,C CKT
Check HBNK & V-
Check R1906 &
R1907
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