DOWNLOAD LG 37LG7000 (CHASSIS:LD88F) Service Manual ↓ Size: 3.83 MB | Pages: 37 in PDF or view online for FREE

1) Adjust in the place where the influx of light like floodlight

around is blocked. (illumination is less than 10ux).

2) Adhere closely the Color Analyzer (CA210) to the module

less than 10cm distance, keep it with the surface of the
Module and Color Analyzer’s Prove vertically.(80~100°).

(3) Aging time

- After aging start, keep the power on (no suspension of

power supply) and heat-run over 15 minutes.

- Using ‘no signal’ or ‘full white pattern’ or the others, check

the back light on.

- Auto adjustment Map(RS-232C)

(1) Press the ADJ KEY on Adjustment R/C.

Select “3. Test Pattern” by using 

D

/

E

(CH +/-) and press

ENTER(

A

)

Select “White” by using 

F

/

G

(VOL +/-) and press

ENTER(

A

) and heat run over 15 minutes.

(2) Zero  Calibrate  CA-100+ / CA-210, and when controlling,

stick the sensor to the center of LCD module surface.

(3) Press the ADJ KEY on Adjustment R/C
(4) Select “2. White Balance” and press 

G

(VOL +)

Set test-pattern on and display inside pattern. 

(5) Control is carried out on three color temperatures, COOL,

MEDIUM, WARM. 

(Control is carried out three times)

< Temperature: COOL >

- R-Cut / G-Cut / B-Cut is set to 64.
- Gain of Fixed color should be kept on 192, and

adjust other two lower than 192.

- Each gain is limited to 192.

< Temperature: MEDIUM >

- R-Cut / G-Cut / B-Cut is set to 64.
- Gain of Fixed color should be kept on 192, and

adjust other two lower than 192.

- Each gain is limited to 192.

< Temperature: WARM >

- R-Cut / G-Cut / B-Cut is set to 64.
- Gain of Fixed color should be kept on 192, and

adjust other two lower than 192.

- Each gain is limited to 192.

* One of R Gain / G Gain / B Gain should be kept on

192, and adjust other two lower than 192.
(When R/G/B GAIN are all 192, it is the FULL
DYNAMIC Range of Module)

- 13 -

RS-232C COMMAND

MIN

CENTER

Max

[CMD ID DATA]

(DEFAULT)

Cool

Medium Warm

Cool

Medium Warm

R Gain

jg

Ja

jd

00

192

192

192

255

G Gain

jh

Jb

je

00

192

192

192

255

B Gain

ji

Jc

jf

00

192

192

192

255

R Cut

64

64

64

128

G Cut

64

64

64

128

B Cut

64

64

64

128

- 14 -

Does not screen

whole comes out?

Yes

No

Yes

Start check

1. Check the Power off condition.

Is it identical with

power off condition?

Is the interface

signal operated?

Yes

2. Check the interface signal condition.

Yes

3. Check the St_by 5V

signal circuit.

Yes

4. Check the AC detect

signal circuit.

Yes

No

5. Check the VSC RL_ON

/PWR_ON/OFF signal.

No

No

No

Does not

low voltage output

comes out?

Yes

Does not the

St-by 5V(P-5V) signal

comes out?

Does not the

AC Detect signal

comes out?

No

Does not the

RL_ON/PWR_ON/OFF

comes out?

No

Yes

7. Check the VSC  INV_CTL signal?

Yes

8. Check the INV 24V
voltage output circuit.

Manufacture enterprise
meaning of a passage.

Yes

6. Check the VSC low
Voltage output.

Does not

inverter signal output

comes out?

Yes

Does not the

VSC signal INV_CTL

comes out?

Does not the

INV 24V voltage output

comes out?

No

Does not the

VSC Low voltage output

comes out?

- 15 -

1) It does not charge at module.
2) Front LED does not work.

A power cord is plugged in with TV set?

Plug the power cord in.

Is AC-INLET Cable(Red+Blue) connected with th  PSU?

Connect the AC-INLET Cable.

Yes

No

No

Are the fuses OK on the PSU?
(check open or short status with Multi-meter)

Replace the fuse.

Yes

No

Is the PSU connected with Main Board though a 24pin cable?

Connect a 24p cable to PSU to Main(P1000)pin.

Yes

Measure output voltages(16V, 12V, 5V) on the PSU.
-> [Main P1000] pin1,2:16V; pin(5,6):12V; pin(9~12):5V;
If the measured values are not a proper value, replace PSU.

Yes

No

- 16 -

NG : always RED

No problem

Check LED A’ssy color.

Check remote control

Power key off.

Replace LED A’ssy.

Check P500 VDD voltage
(pin1~4) 12V

No problem

No problem

No problem

Check LVDS data
signal(pin11~22, pin27~38)

No problem

Replace T-con board of
LCD Module.

No problem

Replace IC100.

Replace regulator.

No problem

Lamp On status

Lamp off

Check inverter lamp

On/Of status.

Check LVDS Cable.

Replace the LVDS Cable.

NG

NG

NG

Check Q501, L502,500,
PANEL_Vcc_EN signal.

NG

Recheck PSU(+5V, +12V, +16V)
-> If not OK then replace PSU

Replace PSU

Check the PWM signal

(P1000, pin 22, 21)

Replace the Main B/D.

NG

Re App S/W download.

If not OK then replace IC100.

Check IC502 power block

L1200(1.0V), L1213(1.8V)

IC1204(3.3V), IC1205(3.3V)

IC1206(1.2V)

No problem

Check LED A’ssy.

Replace PSU B/D or Main B/D.

Is the inverter OK?
(INV_CTL signal :
P1000 :pin20)

Re MICOM S/W download
-> If not OK then replace
IC802

No problem

No

problem

NG

NG

NG