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LG 710B - Page 17

LG 710B
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'(6&5,37,212)%/2&.',$*5$0

3-033WITCHING-ODE0OWER3UPPLY
7HENYOUTURNONTHEPOWERSWITCHTHEOPERATING
PROCEDUREISASFOLLOWS
4HE!#LINEVOLTAGEISRECTIFIEDBYTHEBRIDGEDIODE
$
4HECONTROL)#)#STARTSSWITCHINGANDGENERATES
SWITCHPULSEINTHEPRIMARYTURNOFTHE3-03
TRANSFORMER4
4HESWITCHINGPULSESOFTHEPRIMARYTURNSAREINDUCED
TOTHESECONDARYTURNSOFTHETRANSFORMERBYTHETURN
RATIO4HISPULSESARERECTIFIEDBYEACHDIODE$
$$$$$
%ACHRECTIFIED$#VOLTAGE6666
AND6
/VER6OLTAGE0ROTECTION#IRCUIT
7HENTHEINPUTOF)#6IN PINISMORETHAN
6ALLTHESECONDARYVOLTAGESOFTHE3-03
TRANSFORMER4DOWNTOLOWVALUE
$ISPLAY0OWER-ANAGEMENT#IRCUIT$0-
34!.$"93530%.$-ODE
7HENNOINPUTOFHORIZONTALORVERTICALSYNC1
1ARETURNEDOFFAND11ARETURNEDOFF
4HENINPUTPOWERCONSUMPTIONISBELOWWATTS
/&&-ODE
7HENNOINPUTOFHORIZONTALANDVERTICALSYNC1
1ARETURNEDOFFAND11ARETURNEDOFF
4HENINPUTPOWERCONSUMPTIONISBELOWWATTS
82!90ROTECTION#IRCUIT
7HENTHEHIGH6OLTAGEREACHESTOK6INANABNORMAL
CASETHEHIGHVOLTAGEDETECTORCIRCUIT2$#
2#STARTOPERATIONTOSHUTDOWNHIGHVOLTAGE
CIRC
UIT
-ICROPROCESSOR#ONTROL(ORIZONTALAND
6ERTICAL3YNC0ROCESSOR#IRCUIT
4HEOPERATINGPROCEDUREISASFOLLOWS
4HEREIS(ORIZONTAL6ERTICALPROCESSFUNCTIONIN
-ICROPROCESSOR)#
-ICROPROCESSOR)#DISCRIMINATESTHEOPERATING
MODEFROMTHESYNCPOLARITYANDRESOLUTION
!FTERMICROPROCESSORREADSTHESEADJUSTEDMODEDATA
STOREDAT%%02/-ITCONTROLSOPERATINGMODEDATA
THROUGH))#
5SERSCANCONTROLSCREENCONDITIONBYTHE/3$3ELECT
5P$OWN,EFT2IGHT%XIT
4HEHORIZONTALANDVERTICALSYNCPROCESSOR)#)#
HASASYNCDETECTORASAWTOOTHGENERATORANDDRIVE
FUNCTION!NDOUTPUTSHORIZONTALANDVERTICALDRIVE
SIGNALTOCONTROLSCREENDISTORTIONS
$$#ONVERTER#IRCUIT
4OOBTAINCONSTANTHIGHVOLTAGETHISCIRCUITSUPPLIES
CONTROLLED$#VOLTAGEFOR&"4ANDHORIZONTALDEFLECTION
CIRCUITACCORDINGTOTHEHORIZONTALSYNCFREQUENCY
(ORIZONTAL3CORRECTION#IRCUIT
4HISCIRCUITCORRECTSTHEHORIZONTALLINEARITYFOREACH
HORIZONTALSYNCFREQUENCY
(ORIZONTALDRIVEAND/UTPUT#IRCUIT
4HISCIRCUITISAHORIZONTALDEFLECTIONAMPLIFIERFORRASTER
SCAN
!",#IRCUIT
4HISCIRCUITLIMITSTHEBEAMCURRENTFORTHERELIABILITYOF
#$4
6ERTICAL/UTPUT#IRCUIT
4HISCIRCUITTAKESTHEVERTICALRAMPWAVEFROMTHE
4$!*)#ANDPERFORMTHEVERTICALDEFLECTION
BYSUPPLYINGTHESAWTOOTHWAVECURRENTTOTHEVERTICAL
DEFLECTIONYOKE
"LANKINGAND"RIGHTNESS#ONTROL#IRCUIT
"LANKINGCIRCUITELIMINATESTHERETRACELINEBY
SUPPLYINGANEGATIVEPULSEWAVETOTHE'OFTHE#$4
"RIGHTNESSCONTROLCIRCUITISUSEDFORCONTROLOFTHE
SCREENBRIGHTNESSBYCHANGINGTHE$#LEVEL'

/3$/N3CREEN$ISPLAY#IRCUIT
4HISCIRCUITDISPLAYSINFORMATIONOFTHEMONITOR{SSTATUS
ONTHESCREEN
)MAGE2OTATION4ILT#IRCUIT
4HISCIRCUITCORRECTSTHETILTOFTHESCREENBY
SUPPLYINGTHEIMAGEROTATIONSIGNALTOTHETILTCOIL
WHICHISATTACHEDNEARTHEDEFLECTIONYOKEOFTHE
#$4