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PC-UM10M

LL-T15V1

DISASSEMBLY AND ASSEMBLY

3 – 1

1) Remove the screw 

A

 and the two screws 

H

, then, remove the hinge cover 

2

.

2) Remove the four screws 

B

 to separate the LCD from the stand.

3) Remove the two screws 

C

 and remove the hinge.

4) Remove the two screws 

i

 and disassembly the stand.

1) Remove the four screws 

A

 and the two screws 

C

, then, remove

the rear panel 

1

.

2) Remove the two lock screws 

J

 and the six screws 

C

, then,

remove the main board shield 

2

.

3) Remove the four screws 

F

 and remove the connector 

b

, 

c

, 

a

and 

h

, then, remove the main board 

6

.

4) Remove the four screws 

D

, then, remove the inverter shield 

3

.

5) Remove the four screws 

G

 and remove the connector 

d

, 

e

, 

f

and 

g

, then, remove the inverter board 

7

.

6) Remove the three screws 

E

, then, remove the front cover 

4

,

LED filter 

9

, key button 

F

 and switch board 

5

.

7) Remove the four screws 

K

 and remove the LCD module 

8

.

PC-UM10M

LL-T15V1

TROUBLESHOOTING

4 – 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

*  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 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 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)?
3) +5VX, 3.3V, PVD, VDD, VD, 3V3, VLCD, 
    3V3 signal is output?
4) LED
   *  Check LED for breakage.
   *  Check the path between J101 (Pin 3) 

and IC101 (Pin 16).

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

Backlight turns ON?

Check for RGB cable input 
signal.

Replace RGB cable.

Check each pin terminal 
of connector (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 with a 
new one.

Replace inverter PWB 
unit with a new one.

A

PC-UM10M

LL-T15V1

TROUBLESHOOTING

4 – 2

A

Screen does not operate normally.

Check RGB cable.

Defective

Replace RGB cable with 
a new one.

Check screen condition by changing display modes.

Reset the microprocessor 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.

2) Check if VLCD voltage is output normally.

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.

PC-UM10M

LL-T15V1

CONNECTOR SIGNAL NAME • BLOCK DIAGRAM • CIRCUIT DIAGRAM • PWB LAYOUT

5 – 1

CONNECTOR W01

CONNECTOR W07

CONNECTOR W06

 

  

  

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CONNECTOR W04

#

#

#

*+

#

 

 

!

!

#

#

#

CONNECTOR W05

#

!

#