Tatung VL5A9DA, Service Manual

Page: 13 / 89

13
II. MAIN SUBROTINE LOOP
)
Main loop start
Process Power-saving status ( according to below flow-chart result)
Check GMZAN IFM status .is change or not.
And check Signal cable status ( cable not connected or not )
** IFM is the register which measured the HSYN & Vsyn status
Is current system status in Power-saving ?
Yes, IFM have change Wake-up GMZAN1
(because GMZAN1 was in
partial sleeping state)
Yes
Check the IFM result is in the standard
Mode table ?
No
Check the IFM result is in the user mode
table ?
Out of range ( input not support) be
confirm
Set mode index & parameter
Set change mode flag
No
No
Yes
Yes
confirm the frequency ( Hsyn or Vsyn) from IFM already
been changed ? ( check the change mode flag)
Process ( turn off OSD , setting GMZAN1according to
above parameter,set LED status, set backlight status)
Check Auto-config mode flag already been set?
No
Do Auto-config
automatically
Read Key status and Process on OSD-screen
Check Factory mode flag= 1
No
Yes , freq had been change
Monitoring the time-out of osd status ( if no key input persist for
10 sec , the osd time-out counter will trigger )
No
if the RS232 buffer is full,
process the command( while
adjust white-balance in factory
mode)
Yes
No
Yes