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LL-T17D3-H/B

BLOCK DIAGRAM

4 – 2

■ 

■ 

■ 

■ 

IIC 

Power  

management 

ADC 

C lamp 

Video gain 

Video level 

R   8  

G   8  

B   8 

R 

G 

B 

 

H 

V 

SCL 

SCL 

DATACLK 

HSOUT  

VSOUT  

SOGOUT  

IC 

05 

MTV230 

IC 04 

EEPROM  

ISCL

ISDA

   + 5V 

+3.3V 

IC03 

TLC2933 

O utput 

Sync-processor

and clock 
generator 

Control 

Register

Digital  

Data  

Processor 

Control 

Center 

Scaling 

D ithering

OSD 

IC02 AM101A-2

EEPROM  

Interface 

Input mode 

Detection & 

Calibration 

IC 07 

VC LK1 

FC LK1 

HSOUT  

VSOUT  

OSD-R 

G B 

POWER 

CONTROL  

+12V 

LVD S 

TF T LCD  

Modul e  

IC 20 

Signal  

Speaker 

IC 01 AD 9883 

Sync processor and

clock generator

input

Sync-processor and

clock generator

Audio

Audio AMP.

ASIC

SD1010A

ADC9883

74hc157

EDID/A

Selector

EDID/D

EDID

Selector

BA7657

D-SUB

ANALOG

ANALOG + TMDS

DVI-I

TMDS153B

RGB+H, V

H

V

RGB

Control
to CPU

RGB

RGB

5V

H1 &V1

SCL, SDA

SCL, SDA

H2 &V2

RGB+H, V

LL-T17D3-H/B

BLOCK DIAGRAM

4 – 3

■ 

■ 

■ 

■ 

1

Red

2

Green

3

Blue

4

Ground

5

Ground

6

R-GND

7

G-GND 

8

B-GND

9

+5V

10

Ground

11

N.C

12

(SDA)

13

H-sync

14

V-sync

15

(SCL)

1

12V

2

GND

1

POW1

2

GND

3

LED1

4

LED2

5

SN1

6

SN2

7

NU

8

3.3VX

1

N.C

2

CON

3

VEE

4

GND

5

VDD

1

RXO0-

2

RXO0+

3

TXO3+

4

TXO3-

5

TXOCK+

6

TXOCK-

7

GND

8

TXO2+

9

TXO2-

10

TXO1+

11

TXO1-

12

GND

13

TXO0+

14

TXO0-

15

TXE3+

16

TXE3-

17

GND

18

TXECK+

19

TXECK-

20

TXE2+

21

TXE2-

22

GND

23

TXE1+

24

TXE1-

25

TXE0+

26

TXE0-

27

GND

28

LCD5V

29

LCD5V

30

LCD5V

1

GND

2

L

3

GND

4

R

5

GND

1

R-

2

R+

3

L+

4

L-

LL-T17D3-H/B

TROUBLESHOOTING

5 – 1

No power supply

Does LED turns on in green 
when power switch is turned 
on?

No

No

No

No

No

No

LED turns on in red?

Yes

Yes

Yes

Yes

Yes

Yes

Yes

*  Check LED for breakage.
*  Check key cable for disconnection.

Replace any unit (main PWB, SW PWB, cable) 
which shows any defect, with a new one.

1) PC is turned off?
2) RGB/DVI cable is disconnected?
3) Synchronizing signal is output from RGB 

cable?

Check whether the unit is in power save 
mode (synchronizing signal is not input.).

Synchronizing signal is input to main PWB?

Replace RGB/DVI 
cable with a new one.

LED turns on in orange?

Check power input system.

1) AC adapter
   *  Normal?
   *  Connected properly?
2) Blown out fuse (F1, F02, F03)?
3) Check +5VX, 3.3VX, 3.3VA, VDD, VD
    and VLCD are output?
4) LED
   *  Check LED for breakage.
   *  Check the path between W04 and 

IC15.

   *  Check the cable for disconnection.

Replace any defective unit.
[ 1) AC adapter, 2) Main PWB, 
3) Switch PWB ] with a new one.

Backlight turns ON?

Check for RGB/DVI cable 
input signal.

Replace RGB/DVI cable.

Check each pin terminal 
of W05.

Normal

Normal

Normal

Defective

Defective

*  Check inverter PWB unit.
Note: Use caution when checking output 

side because it has a high voltage. 

Replace LCD module lamp with 
a new one.

Replace inverter PWB 
unit with a new one.

A

LL-T17D3-H/B

TROUBLESHOOTING

5 – 2

A

Screen does not operate normally.

Check RGB/DVI cable.

Defective

Replace RGB/DVI cable 
with a new one.

Check screen condition by changing display modes.

Operate the "ALL RESET" to check if screen condition changes.
(Press and hold MENU and SELECT buttons while turning on power switch.)

Screen stays in black.

Screen stays in white.

Screen jitters or on-screen 
characters flicker.

Abnormal color

Check the following signals

1) Check if module control signal is output (IC02).

2) Is the power supply of IC21 and IC22 turned 

ON?

3) Check if control signal is output (IC21, IC22).

4) Check if VLCD voltage is output normally.

(Check if F03 is blowout.)

Yes

No

Yes

No

Yes

No

CLOCK and PHASE 
can be adjusted?

Does abnormal area move on 
screen when BLACK LEVEL or 
CONT is changed after H-POS 
or V-POS is set?

Switch PWB defective

Main PWB defective.

LCD panel defective.