ViewSonic VS10848-1M Service Manual page 12

ii. Switching power ON
When Switching power receives the start order by 2
Then by Q25 2N7002 (signal mark V12_ON) and 1
provides +12V (POWER STREE, refer to page 26 of schematic) and +24V to turn on the circuit of
+5V(signal mark VCC).
iii. . +5V (signal mark VCC) turn on when V12_ON=Hi, Every batches of digital board circuit would be
able to process Power ON procedure. (VCC POWER STREE, please refer to page 26 of schematic)
iv. CPU RESET
U19 PW328 CPU will output a Hi level to trigger other IC to reset when +5V, +12V and +24V start to
work. Then Firmware starts to read the data of U39 and U40 via U35 PW200 CPU and transmits data
via 12C and sends control signal to run the TURN ON
ViewSonic Corporation
nd
pin of U48 (signal mark PWRON),
st
pin of J17 to control Switching Power Model
procedure.
11
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