NEC MultiSync 20WGX2 Service Manual page 109

1. Interface B B oard and 1. Interface oard and P P anel
1 1 . . 1 1 3 3 0 0 3 3 c c o o n n n n e e c c t t o o r r
A 5V po A 5V powe wer su r suppl pply fo
A12V 2V po A1 powe wer s r sup uppl ply y fo for L
1.2 I307 1.2 I307 , I3 , I306, 06, I31 I317 te 7 termina
I3 I307 07 : : A A 3. 3.3V 3V po powe wer su
I3 I306 06 : : A A 1. 1. V V po powe wer s
I317 : I31 7 : A A 3.3 3.3V V pow power s
I3 I313 O 13 ON/ N/ OFF c OFF con ontro
I327 ON/ I327 ON/ OFF control for U OFF control for USB hub circui
2 2 . . i i d d e e o o I I nput nput C C ircuit ircuit
The anal The a nalog vi og video deo sign
th the b e bla lack l ck lev evel el at at 0V 0V . .
The digita The di gital TMDS i l TMDS input e
3. System R R eset, LED 3. System eset, LED C C ontrol
3 3 . . 1 1 S S y y s s t t e e m m R R eset eset
Sys System rese tem reset is pe t is performed b
3 3 . . 2 2 L L E E D D C C ontrol ontrol C C ircuit ircuit
Blue / Blue / amber con amber control si trol signal of th
2 2
4. E 4. E R R O O M f M fo o r E r ED D I I D D
The EDID of The ED ID of Anal Analog inpu
I3 I334 34 fo for D r D I P I P C C to to ac
5. E 5. E 2 2 R R O O M M
Da Data ta tr tran ansf sfer b er bet etwe ween
SDA (pin 99 SDA (pin 99) of I308 ) of I308 . The data to be
● ●
I309 control data. I309 control data.
● ●
OSD related setting data. OSD related setting data.
Other control data for Other control data for service menu.
● ●
anel P P ower ower S S upply upply
y for LC r LC D mod D module ule, sca , scaler ler, an
r L D m D mod odul ule. e.
rminal re l regul gulator ator
r supp pply ly fo for Sc r Scal aler I er IC C I3 I308 08 an
r sup uppl ply y fo for V r V id ideo eo IC IC I9 I901
er supp upply ly for U for USB I SB IC C I31 I319 is
trol fo l for LC r LC D Mo D Modu dule le
SB hub circuit. t.
signal i al input nput ente enters fro rs from P m P 306 a
nput enter nters from P s from P 302. 302.
ontrol C C ircuit ircuit
rformed by det y detecti ecting the r ng the risi ising and fal
gnal of the LED BLUE a e LED BLUE and LED
og input is sto t is stored in I3 red in I303 and th 03 and the EDI
acce cess ss th the i e inf nfor orma mati tion on of of mon
en I3 I310 10 (2 (24L 4L 32 32B) a B) and nd sc
. The data to be transferred to e transferred to each devi
service menu.
, and lo d logic i gic is ge s gener nerate ated from t
and SD d SDRA RAM I M IC C I3 I31 1 1/ 1/ I3 I312
01 an and d AS ASca cal l er er IC IC I3 I308 08 ar are g
9 is gen genera erated ted fro from th m the 5V e 5V . .
306 and P nd P 31 311, t 1, the he AC AC -cou
ng and falling o ling of the 5V f the 5V sour
nd LED AMBE AMBER sign R signal pin 20
e EDID of Dig D of Digital i ital input is s
monit itor or. .
scal aler I er IC C I3 I308 08 is is ef effe fect cted
ach device are stored in I ce are stored in I310.
7- 7- 2 2
d from the P he P 303 c 303 conn onnect ector.
12 are are ge gene nera rate ted fr d from t om the
e gen ener erat ated ed fr from om th the 3
-coupled pled vid video si eo signal gnal is use is used to
source vol ce voltage a tage at I308 t I308 . .
al pin 204, 203 from I3 4, 203 from I308 08 . .
nput is store tored in I304 fo d in I304 for DV
ed th thro roug ugh t h the he II IIC C bu bus S s S L (
310.
or.
he 5V 5V . .
e 3.3 .3 . .
d to clamp clamp
r DV I C I C E and E and
L (pi pin 9 n 9 ) an ) and d