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① Check the contact condition of or 24V connector of Main Board

② Measure the 24V input voltage supplied from Power Board

(If there is no input voltage, remove and check the connector)

③ Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the 
GND and output terminal, the speaker is normal. 

①

②

③

②

24 Pin

 

(Power Board ↔ Main Board) 

1

Power on

2

24V

3

24V

4

24V

5

GND

6

GND

7

GND

8

GND

9

3.5V

10

3.5V

11

3.5V

12

3.5V

13

GND

14

GND

15

GND

16

V-sync

17

12V

18 Inverter On/off

19

12V

20

N.C

21

12V

22 PWM Dim #1

23 PWM Dim #2 24

Error-out

<XXLM9600>

Checking order

1, 2.  Check IR cable condition between IR & Main board.
3.      Check the st-by 3.3V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the 

Analog Tester needle moves slowly, and defective when it does not move at all. 

<XXLM9600>

P4102

1

SCL

2

SDA

3

GND

4

KEY1

5

KEY2

6

St 3.5V

7

GND

8

GP4_LED_R

9

IR

10

GND

①

②

③

④

Checking order

1, 2.  Check Motion cable condition between Motion assy & Main board.
3.      Check the 3.3V on the terminal 1.

P4800

1

3.3V

2

GND

3

RX

4

TX

5

RESET

6

DC

7

DD

8

GND

①

②

③

<XXLM9600>

Checking order

1, 2.  Check Wifi cable condition between Wifi assy & Main board.
3.      Check the 5V on the terminal 1.

P4301

1

VDD

2

DM

3

DP

4

GND

②

③

①

<XXLM9600>