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CP-780 Service Manual
3.8 OAD (Over Air Download)
3.8.1 Concept of OAD
OAD is the function for updating software of IDTV(Integrated Digital TV) or DSTB (Digital Set-Top
Box) from outer source.
3.8.2 Object of OAD
Sometimes IDTV or DSTB may need a newer software for technical or system problems after sale,
so through OAD function, IDTV or DSTB may be updated automatically at each user’s home.
3.8.3 OAD on CP-780
CP-780 performs OAD automatically when being on ST-BY mode. But CP-780 can’t supply power
to digital part to search s/w on ST-BY mode. To solve this, CP-780 is worked as below.
a. power off by remote control on Analog mode : go directly to ST-BY mode. In this case, power
consumption : 1.5w / AC 230V.
b. power off by remote control on Digital mode
- go to video mute (raster off) and stay about 3~5 minute to search S/W. In this case, power
Consumption is 52W / AC 230V
- After finishing searching s/w, TV set go to ST-BY mode. (1.5W / AC 230V) If turn off TV before
TV complete searching s/w, TV set will perform it again.
- If TV set find a new s/w to update, a update message will be shown on the screen when the
user turn on TV.
- CP-780 performs this process once a day.
- If the user doesn’t want OAD search, the user can press R/C button for 2~3 sec to go directly to
ST-BY mode.
3.8.4 Algorithm of OAD
Digital stream has a date/time information. CP-780 stores a date info at NVM. UOC brings date
info from digital stream and compares it with NVM data. If those two are different from each other,
TV set performs OAD and store a date info at NVM.If those two are the same, go directly to ST-BY
mode. Through this algorithm, CP-780 perform OAD search once a day.
HOR WIDTH
adjust for 93% overscan.
PARABOLA
CORNER B & CORNER T
EW TRAPEZ