Display Board - Sony STR-K790 Service Manual

STR-K790
– DISPLAY Board –
IC100 PT6315
LED1
1
LED2
2
3
LED3
LED4
4
OSC
5 OSC
DOUT 6
DIN
7
Serial
interface
CLK
8
STB
9
KEY1 10
KEY2 11
12 13
IC101 TC74ACT08P
1A
1
1B
2
1Y 3
2A 4
2B 5
2Y 6
GND 7
38
44 43 42 41 40 39
Grid driver
Command decoder
Display memory
24 bits x 12 words
Timing generator
key scan
Key data memory
(2 x 16 bits)
VCC
14
13 4B
4A
12
11
4Y
10
3B
3A
9
3Y
8
38 37 36 35
Multiplexed driver
segment driver
14 15 16 17 18 19 20 21
34
SEG19/GRID10
33
32 SEG18/GRID11
SEG17/GRID12
31
30 VEE
29 SEG16/KS16
28 SEG15/KS15
27 SEG14/KS14
SEG13/KS13
26
25 SEG12/KS12
SEG11/KS11
24
SEG10/KS10
23
22