Dell 21N21E2 service manual Block Diagram

BLOCK DIAGRAM

CH UP

MICON W/T.TEXT IC

CH DOWN

TU001

IC101 OECF013B

Q102

SCL SDA

BPL

AGC

IF

LED DRIVE

49

ON_TIMER

VOL UP

4

5

7

1

11

Q103

KEY_IN

56

VOL DOWN

LED DRIVE

9

STANDBY LED

I2C

ON TIMER

P.CON+5V

D103

STAND BY/P.ON

SDA

19

5

SDA

MEMORY IC

CHROMA IC

D101

39

AVDD1

IC199

IC201

STV2248E

SCL

20

6

SCL

31

AVDD2

S-24C16AFJA-TB-01

8

6

7

OSD-B

15

34

OSD-B

OUTAGCRF

PIFIN2

AT+5V

25

AVDD3

PIFIN1

OSD-G

16

35 OSD-G

51

SCL

OS101

1

OSD-R

17

36 OSD-R

VERT 47

1

REMORT

CVBS2 33

29

CVBSOUT1

50

OSC_OUT

CVBS1

34

X602

39 XTAL2

X101

AV1

42

40 XTAL1

SDA 52

4MHz

3.579545MHz

H_OUT 48

51

OSC_IN

X601

4.433619MHz

B.OUT

30

FORTHD VCR1

53

12

VCC_IF

G.OUT

31

P.CON+5V

53

VCC_D

R.OUT

32

P.CON+8V

45

VCC1

17

VCC2

R_EXT/V_EXT 27

Q204

G_EXT/Y_EXT

26

B_EXT/U_EXT 25

SIF BUFFER

11

FM_OUT

BLK_EXT

28

AUDIO SW IC

14

EXT_AUDIO_IN

Y/CVBS_IN3

IC701 MM1501XNRE

22

55

AUDIO_OUT

CVBSIN2

20

IN2

4

INT_CVBS_OUT 13

IN1

6

OUT

2

SW

1

J701

R OUT

1

19

VIDEO OUT

L OUT

VIDEO IN

3

20

16

21-Y IN

R IN

2

7

21-B IN

21-G IN

L IN

6

11

FOR VCR

8

15

21-R IN

Q703

BUFFER

SOUND+B

SOUND AMP IC

2

IC1002

HEADPHONE JACK

5

AN5276

5

10

7

J702

1

+

VCC

+ -

SPEAKER

SP351

V-DRIVE IC

IC401 TDA8174A

	Vs	10	P.CON+25V
	POWER OUTPUT	1			DY
3 TRIGGER INPUT
I2C
Q402	Q401			FB401
H.DRIVE	H.OUTPUT	J801		1	2	+B
	Q806				3	P.CON+25V
	BLUE AMP	11	F	F
	Q805
	GREEN AMP	6	7	S	HV
	Q804
	RED AMP	8

CRT

V801

	FRONT VIDEO
	J703
	3
	1
	2
	FRONT AUDIO L
	J704
	3
	1
	2
SW TRANS	Q501
T501
5	D POWER
9	SOUND+B
12	+B
15	P.CON+8V
16	AT+5V
	P.CON+5V

E-1 E-2