Two 7. Segment Led's Are Blanked; One 7. Segment Led Is Blanked; One Segment Of All Led's Is Incorrect - Philips PM2517E Service Manual

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6.2.5. Two 7. segment LED'S are blanked
6.2.6. One 7. segment LED is btanked
B
D i q i t S e l e c l O S 1 i 2
o00059 (Dr0r)
H 1 = D 1 0 1 i I { D S l )
H i = D 1 0 1 / 2 ( D S 2 )
W i t h o s c l o s c o p e
-l
T'1 l-1 T 0
J L J U L J
- 8 5 V
=500H2
- 0
J
l-J L
asv
=25AHz
F e i e r t o I R e i e r l o G
G
Clock OO0059
( D 1 0 1 )
H r = D 1 0 1 / 1 3
W i l h o s c i l l o s c o p e
- 8 . 5 V
8 0 1 2 0 k H z
H e l e r 1 o H N o s r g n a
T r ä c k i n t e r r u p t i o n
A r 0 1 / 2 . D r 0 1 / 1 3
G
S u p p y v o l t a g e
oo0059
( D 1 0 1 )
H = D 1 0 t / 1 2 ( _ )
- 8 V . . . 9 V
D e i e c l O O 0 0 5 9
Supply voily voltage
oQ0059
( D r 0 1 )
H i = D 1 0 1 / 1 2 ( - )
- 8 V . . . - 9 V
D e l e c l O Q 0 0 5 9
S u p p y v o l l a g e
\ o 7 0 2 )
H r = D 7 0 2 i 8
- 8 V - 9 V
D e l e c l D 7 0 2
l o .
From lvleasurement
l \ y ' e a s u r i n g p o i n t s
l M e a s u r i n g d a t a C o r r e c t I n c o r r e c t
D r g i t S e l e c t D S 1 / 2
o 0 0 0 5 9 ( D 1 0 r )
H = 0 1 0 1 i 1 ( D S 1 )
H i = D 1 0 1 / 2 ( D S 2 )
W l h o s c i l l o s c o p c
- F F F . o
J LJ lJ Ll U -s5y
=500H2
t-t r-t
f o
8 5 V
-250H2
R e i e r r o I
D e i e c t O 0 0 0 5 9
B
D r g i t S e l e c t D S 1 / 2
H E F 4 5 5 5 ( D S 7 0 2 )
H i = 0 7 0 2 1 2 ( D S 1 )
H i = D 7 0 2 l 3 ( D S 2 )
W i l h o s c L o s c o p e
fll-Lflf'u 1uuu
= 5 0 0 H 2
f-LJ-l_['-usu
- . 2 5 O H z
D e f e c t D 7 0 2
N o .
F r o m
M g a s u r e m e n t i / e a s u r i n g p o i n t s
l v l e a s u r i n g d a t a
Correct
I n c o r r e c t
V b a i s o 1 l h e c a t h o d e
s w r l c h e s o l t h e L E D s
c o n c e r n r n q
H r = b a r s V 7 0 1 / 7 0 2 1 7 0 3
o t V 7 O 4
W r t h o s c i l l o s c o p e
B I o c k s i g n a r . : 3 V p . p
D r v s r o n o f t h e s i g o a l s
D S l a n d 0 S 2
R e l e r l o F i g . 2 5
D e l e c t t r a n s i s t o r
v 7 0 1 1 7 0 2 1 7 0 3 o r V 7 A 4
R e l e r t o B
B
O u l p u t s o f H E F 4 5 5 5
t D 7 A 2 )
H i = D 7 4 2 t 4 t 5 1 6 a t 7
W i l h o s c i l l o s c o p e
B o c k s r g n a l . = 8 v p p
D i v r s i o n o t s l g n a l s
D S l a n d D S 2
F e f e r l o F i g . 2 5
R 7 1 5 1 7 1 6 1 7 l f o t
R 7 1 8
T r a c k i n t e ( u p l o n
D e i e c t D 7 0 2
6.2.7. One segment of all LED'S is incorrect
i o .
rom
l\y'easurement l v l e a s u r i n g p o i n t s
l\.4easuring data
C o r r e c t I n c o r r e c t
L E D s e g m e n t D r s p l a y
C o n s l a n t l r g h t i n g
0 e l e c t D 7 0 1
B
L E D s e g m e n i
D i s p l a y C o n s l a n l m i 5 s n g
R e l e r l o C
c
o u t p u r o i H E F 4 5 1 1
(D701)
C o r e s p o n d i n g o u l p u t
l a / g )
H i = o 7 0 1 i 9 . . 1 5
W l h o s c i l l o s c o p e
E l o c k s r g n a 8 V p . p .
D r v i s i o n o l s i g n a l s
4 0 . 4 1 , 4 2 . A 3
R e f e r l o F r g . 2 5
D e f e c l r e s s t o r
R703i 709
T r a c k n t e r r u p t i o n
D e i e c t D 7 0 1
6.2.8. One segmenl ol one LED is missing