DOWNLOAD LG 42PC55-ZB (CHASSIS:PD73A) Service Manual ↓ Size: 13.57 MB | Pages: 53 in PDF or view online for FREE

- 17 -

1) Check the original serial number.

(Check the Label on the Back Cover)

2) After change the Main Ass’y, Press the ‘ADJ button on the

Adjustment Remote control.
1. Choose the ‘OPTION4’
2. Insert the ‘MODEL NAME’ by navigation key.
3.  Insert  the  original  serial  number  on  the  ‘SERIAL

NUMBER’ MENU by navigation key.

* After All Setting, Turn Off TV SET-> On

1) Extract to folder lgterm.zip.

1) Prepare the ‘ *.biz ‘ that you want to download on ST.
2) Connect TV set and PC by using RS232 cable, Turn on

the TV.

3) SVC MENU Setting.

case  1.  Press  the  ‘Turbo  Sound’  button  on  the

Adjustment Remote Control.

case 2. Press the ‘ADJ’ button.

1) Press the ‘System Control 2’ menu
2) Enter the ‘GProbe’ on the ‘RS-232 Host’ 
3) Enter ‘115200bps’ on the ‘Baud Rate’
4) Enter the ‘STi 5100’ on the ‘Download’

* If you don’t have a Adjustment Remote Control.

‘Menu’ button on the Remote Control + ‘Menu’ button on
the Local Key during 7~8sec.

4) Execute ‘lgterm.exe’.

1. Select ‘Serial port’ on ‘Setup’ Menu.
2. Port’ should be connected with the TV SET by RS232.

5) TV SET DC Power OFF => ON.

1. Check the message like the Picture.

6) Insert ‘dn’  and Enter.

- 18 -

7) When ‘Please Send the file’ appears, Press ‘ctrl’ + ‘s’.

8) When ‘Please Send the file’ appears, Press ‘ctrl’ + ‘s’.

9) Download takes 60sec ~ 120sec.

10) The End of DOWNLOAD

1.  After  Download  successfully,  you  can  see  ‘EW  EW

EW EW.

2.  You  can  remove  RS232  Cable  and  TV  Power  SET

OFF => ON

11) Change the mode.

1. Press the ‘ADJ’ button.
2. Press the ‘System Control 2’ menu.
3. Enter the ‘PC’ on the ‘RS-232 Host’.
4. Enter ‘115200bps’ on the ‘Baud Rate’.
5. Enter the ‘Cortez’ on the ‘Download.

- 19 -

Start check

Manufacture’s model

passage

1. Check the Power Off

status.

Does the whole
screen appear?

Is it 

identical to when the

power is off?

No

Yes

No

Yes

Yes

Yes

Yes

2. Check the Interface

signal status.

Is the Interface 

signal operating?

Yes

3. Check the St-by 5V

signal circuit.

Does the 

low pressure output

appear?

Does the 

St-by 5V signal 

appear?

No

No

Yes

4. Check the 5V Monitor

signal circuit.

Does the 

5V Monitor signal 

appear?

No

7. Check the VSC Vs-ON

signal 

Does the 

high tension output

appear?

Does the 

VSC signal Vs-ON

appear?

No

No

Does the

high tension 

output voltage

occur?

When

removing  the Y B/D

Module input connector,

does output voltage

drop?

When the

Y, Z B/D Module

input connector, does Power

Board high tension 

output voltage drop?

No

No

No

9. Check the Power

Board Output high

tension circuit

Yes

10. Check the Z B/D

Module output circuit

Yes

When 

removing the Z B/D

Module input connector,

does output voltage

drop?

11. Check the Y B/D

Module output circuit

Yes

Yes

8. Check the Vs, Va

voltage output circuit.

Does the 

Vs, Va voltage output

appear?

No

Yes

Yes

5. Check the VSC RL-ON

signal.

Does the 

VSC signal RL-ON

appear?

No

6. Check the VSC low

pressure output

Does the 

VSC low pressure

output appear?

No

- 20 -

CN1

P1

P2

P3

P11

P12

AC INLET

ANALOG & DIGITAL BOARD

PDP MODULE

AC

NC

AC

YH396-03V

AC Det

RL-ON

STBY 5V

GND

Vs-ON

5V Det

M5V-ON

STBY 5V

GND

NC

6V

GND

3.4V-ON

SMW250-13P

19V

19V

GND

GND

6V

GND

3.4V

GND

12V

GND

SMW250-10P

3.4V

3.4V

GND

GND

6V

6V

GND

GND

12V

12V

GND

GND

SMW250-12P

Vs

Vs

NC

GND

GND

Va

GND

5V

YH396-08V

5V

GND

Va

GND

GND

GND

NC

Vs

Vs

YH396-09V

1

2

3

4

5

6

7

8

9

10

11

12

13

Wafer P/N

NO