DOWNLOAD LG 47LV375H (CHASSIS:LD03X) Service Manual ↓ Size: 4.69 MB | Pages: 39 in PDF or view online for FREE

- 13 -

- Check that Power Cord is fully inserted to the SET.

(If loose, re-insert)

- Unit fully inserted Power cord, Antenna cable and A/V

arrive to the auto-check process. 

- Connect D-terminal to AV JACK TESTER.
- Auto CONTROLLER(GWS103-4) ON
- Perform GND TEST.
- If NG, Buzzer will sound to inform the operator.
- If OK, changeover to I/P check automatically.

(Remove CORD, A/V form AV JACK BOX)

- Perform I/P test
- If NG, Buzzer will sound to inform the operator.
- If OK, Good lamp will lit up and the stopper will allow the

pallet to move on to next process.

• TEST voltage

- GND: 1.5 KV/min at 100 mA
- SIGNAL: 3 KV/min at 100 mA

• TEST time: 1 second
• TEST POINT

- GND TEST = POWER CORD GND & SIGNAL CABLE

METAL GND

NEUTRAL

• LEAKAGE CURRENT: At 0.5 mArms

Measurement condition:
1. RF input: Mono, 1 KHz sine wave signal, 100 % Modulation
2. CVBS, Component: 1 KHz sine wave signal 0.4 Vrms
3. RGB PC: 1 KHz sine wave signal 0.7 Vrms

(option, Service only)

1) Put the USB Stick to the USB socket 
2) Automatically detecting update file in USB Stick

- If your downloaded program version in USB Stick is Low,

it didn’t work. But your downloaded version is High, USB
data is automatically detecting

3) Show the message “Copying files from memory”

4) Updating is starting.

5) Updating Completed, The TV will restart automatically
6) If your TV is turned on, check your updated version and

Tool option. (explain the Tool option, next stage)

* If downloading version is more high than your TV have,

TV can lost all channel data. In this case, you have to
channel recover. if all channel data is cleared, you didn’t
have a DTV/ATV test on production line.

* After downloading, have to adjust TOOL OPTION again.
1. Push “IN-START” key in service remote control.
2. Select “Tool Option 1” and push “OK” key.
3. Punch in the number. (Each model has their number.)

No.

Item

Min. Typ. Max. Unit

1.  Audio practical max

9.0

10.0 12.0

W

EQ Off

Output, L/R

AVL Off

(Distortion=10%

8.5

8.9

9.8

Vrms Clear Voice Off

max Output)

2. Speaker 

10.0 15.0

W

EQ 

On

(8 Ω Impedance)

AVL On

Clear Voice On

- 14 -

Check P1501 All Voltage
Level (3.5 V, 12 V, 20/24 V)

Check power connector and
RL_ON signal.

N

Check IC703 RESET pin.

Check Switch SW700.

N

Y

Replace Power board.

N

Check X701 Clock 10 MHz.
Check X903 Clock 54 MHz.

Check X701/X903 application
circuit or Replace X701/X903.

N

Y

Check IC703 UART
communication 44, 45 pin.

Check UART line or replace
IC703.

N

Y

Check IR input state of IC703
13 pin.

Check IR board.

N

Y

Re-download NEC MICOM.

Y

Check P1501 All Voltage
Level (3.5 V, 12 V, 20 V)

Check power connector and
RL_ON signal.

N

Check Q1504 output Voltage
(12V).

Check Q1504 application circuit
or replace Q1504.

N

Y

Replace Power board.

N

Check LVDS FFC Cable.

Replace Cable.

N

Y

Check LCD Module Control
board.

Y

- 15 -

Check RF Cable.
(TU2701 RF Cable)

You should replace Cable.

N

Check TU2701 Pin 11(Video
out put). Can you see the
normal signal?

Could you measure voltage of
TU2701 & IIC lines?
Are they all normal?

N

Y

You should check power line &
IIC line.

N

Check the input(PinAD9) of
BCM3556(IC100).
Measure waveform at 
C110 or R2112 because it’s
more easy to check.
Can you see the normal
waveform?

Y

This board has big problem
because Main chip(BCM3556)
have some troubles.
After checking thoroughly all
path once again, You should
decide to replace BCM3556 or
not.

Y

You should replace TUNER.

Y

Check RF Cable.
MPI to TU2701 RF Cable

You should replace Cable.

N

Check TU2701 power
Pin 16 (2.5 V), Pin 13(1.2 V)

Check IC2701.

N

Y

Replace IC2701.

N

Check IIC signal TU2701
Pin 17, 18

Check IIC Line
SCL2_3.3 V/SDA3_3.3 V

N

Y

Check FE_TS_DATA[0].

Replace TU2701.

N

Y

Check Power of IC2802 (3.3 V /
1.8 V / 5 V).

Check IC2800/ IC2803.

N

Y

Check IC2800/ IC2803.

N

- 16 -

Is Video input normal?
JK4100 Pin 20

Check the input source & AV
cable.

N

Check the LVDS cable.

Connect the cable.

N

Y

Replace IC100.

Y

Is Video input normal?
JK4100 Pin 15, 11, 7.

Check the input source & AV
cable.

N

Check the LVDS cable.

Connect the cable.

N

Y

Replace IC100.

Y

Is Video input normal?
JK900 Green/Blue/Red

Check the input source &
component cable.

N

Check the input of BCM3556
(IC100) C130, C131, C132

Check the register & Bead
L904/L903/L902 etc...

N

Y

Replace IC100.

Y

Is Video input normal?
JK905 Pin 1, 2, 3

Check the input source & RGB
cable.

N

Check EDID Data.

Re-download EDID data or
Replace IC901.

N

Y

Check the input of BCM3556
C127, C128, C129

Check the register & Bead
L905/L906/L907 etc...

N

Y

Replace IC100.

Y