Akai PDP4249G, Service Manual, Page: 9 / 22

2. VIDEO DISPLAY BOARD
T h is is the s ig n a l in s id e the PDP and au d io d e v ic e d is p o s itio n .
1) I t can re c e iv e c o m p o s ite s ig n a l in c lu d in g R . G . B . H . V . c o n tra s t
s ig n a l, D V I d ig it a l s ig n a l, A V c o lo r d is tin c tio n s ig n a l and
S - V i d e o ..... e t c .
R . G .B .H .V .& Y Pb P r :The s ig n a l is in p u t from (15 P IN ) J1 & J1
to U 6 to perform c o n tra s t s ig n a l ,then
transform to d ig it a l s ig n a l and e n te r to U 2 9 ,
the s ig n a l is passer to U 33 f o r the o u tp u t o f
v is u a l s ig n a l.
D V I : D ig it a l s ig n a l is in p u t from P1 the managed by U6 and passed
to U 29 ,the s ig n a l is passed to U 3 3 f o r the o u tp u t o f v is u a l
s ig n a l output:.
A V & TV : A V & TV s ig n a l e n te rs from J12 & JP18 to U 4 6 to
perform s ig n a l, then transform to U 47 to decode perform
s ig n a l, then transform to U 4 9 to d e in te rla c e perform s ig n a l
and e n te r to U 2 9 , the s ig n a l passed to U 3 3 f o r the o u tp u t
o f v is u a l s ig n a l.
S -V id e o : S - V i d e o s ig n a l in p u t from J12 to U 47 to decode perform
s ig n a l ,then transform to U 49 to d e in te rla c e preform
s ig n a l and e n te r to U 2 9 , the s ig n a l passed to U 33 f o r the
o u tp u t o f v is u a l s ig n a l.
to U 5 f o r v is u a l p ro d u c tio n and a fte r d e p o s itio n , i t w i l l pass
to U 7 f o r s ig n a l co m p e n sa tio n and to U 9 f o r v is u a l s ig n a l
d e p o s itio n o u tp u t.
2) A u d i o is in p u t from J 3 , J8 and from U 6 2 to perform
p re -p ro d u c tio n . T h e n , the a u d io s ig n a l is passed to U 61 SRS process
f o r the s ig n a l o u tp u t b y J4 and J9.
3) W h e n au d io s ig n a l the J4 passed to A m p l i f y f o r the f i n a l output:.
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