DOWNLOAD LG 50PQ20-UA (CHASSIS:PU92A) Service Manual ↓ Size: 12.03 MB | Pages: 57 in PDF or view online for FREE

- 6 -

This spec sheet is applied to all of the “PU92A(HD)” and
“PU92C(FHD)” Chassis.

(1) Because this is not a hot chassis, it is not necessary to use

an isolation transformer. However, the use of isolation
transformer will help protect test instrument.

(2) Adjustment must be done in the correct order.
(3) The adjustment must be performed in the circumstance of

25±5

c

C of temperature and 65±10% of relative humidity if

there is no specific designation.

(4) The input voltage of the receiver must keep 100~240V,

50/60Hz.

(5) The receiver must be operated for about 5 minutes prior to

the adjustment when module is in the circumstance of over
15

c

C

- In case of keeping module is in the circumstance of 0

c

C,

it should be placed in the circumstance of above 15

c

C for

2 hours 

- In case of keeping module is in the circumstance of below

-20

c

C, it should be placed in the circumstance of above

15

c

C for 3 hours.

1) Press the POWER ON KEY on R/C for adjustment.
2) Press the ADJ KEY on R/C and enter EZ ADJUST.

Select “4. WHITE PATTERN” by using 

D

/

E

(CH +/-) and

select “White” by using 

F

/

G

(VOL +/-)

- Set is activated HEAT run without signal generator in this

mode.

- Single color pattern (RED / BLUE / GREEN) of HEAT RUN

MODE uses to check panel.

Caution: If you turn on a still screen more than 20 minutes

(Especially digital pattern, cross hatch pattern), an after
image may be occur in the black level part of the
screen.

Caution: Set up “RF mode(noise)” after PCB assembly adjustment.

(1) Execute ISP program “Mstar ISP Utility” and then click

“Config” tab.

(2) Set as below, and then click “Auto Detect” and check “OK”

message If display “Error”, Check connect computer, jig,
and set.

(3) Click “Connect” tab. If display “Can’t” , Check connect

computer, jig, and set.

(4) Click “Read” tab, and then load download file(XXXX.bin)

by clicking “Read”

(5) Click “Auto” tab and set as below
(6) Click “Run”.
(7) After downloading, check “OK” message.

- 7 -

1) Convert to PC in Input-source

I2C COMMAND: 0xF4 (SELECT_INPUT) 0x00 0x60
(RGB)
cf. 0x10(TV), 0x20(AV), 0x40(COMPONENT), 0x60
(RGB), 0x90(HDMI)

2) Signal equipment displays

3) Adjust by commanding AUTO_COLOR_ADJUST(0xF1)

0x00 0x02 instruction.

1) We confirm whether “0xB6(RGB)” address of EEPROM

“0xA2” is “0xAA” or not. 

2) If “0xB6(RGB)” address of EEPROM “0xB2” isn’t “0xAA”,

we adjust once more

3) We can confirm the ADC values from “0xB0~0xB5

(RGB)” addresses in a page “0xA2”

[

Manual ADC process using Service Remocon. After enter

Service Mode by pushing “ADJ” key, execute “ADC Adjust” by
pushing “

G

” key at “0. ADC CALIBRATION “. 

1) Convert to Component in Input-source

I2C COMMAND : 0xF4 (SELECT_INPUT)  0x00  0x40
(COMPONENT)
cf. 0x10(TV), 0x20(AV), 0x40(COMPONENT), 0x60
(RGB), 0x90(HDMI)

2) Signal equipment displays

3) Adjust by commanding AUTO_COLOR_ADJUST(0xF1)

0x00 0x02 instruction

4) Signal equipment displays

5) Adjust by commanding AUTO_COLOR_ADJUST(0xF1)

0x00 0x02 instruction

[

Manual ADC process using Service Remocon. After enter

Service Mode by pushing “ADJ” key, execute “ADC Adjust” by
pushing “

G

” key at “0. ADC CALIBRATION”. 

(1) We confirm whether “0xBF(480i)/0xC8(1080i)” address of

EEPROM “0xA2” is “0xAA” or not. 

(2) If “0xBF(480i)/0xC8(1080i)” address of EEPROM “0xA2”

isn’t “0xAA”, we adjust once more

(3) We can confirm the ADC values from “0xB9 ~ 0xBE(480i) /

0xC2 ~ (1080i)” addresses in a page “0xA2”

[

Manual ADC Confirmation using Service Remocon. After enter

Service Mode by pushing “INSTART” key.

- 8 -

Caution: Each PCB assembly must be checked by check JIG set.

(Because power PCB Assembly damages to PDP
Module, especially be careful)

Caution: Set up “RF mode(noise)” before voltage adjustment.

(Va, Vs voltage Adjustment)

D.M.M 1EA

Refer to Fig.1, Fig 2, Fig 3

1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D.M.M. to Va pin of P802,

connect-terminal to GND pin of P802.

3) After turning VR902,voltage of D.M.M adjustment as

same as Va voltage which on label of panel right/top
(deviation; ±0.5V)

1) Connect + terminal of D.M.M. to Vs pin of P802, connect

-terminal to GND pin of P802.

2) After turning VR901, voltage of D.M.M adjustment as

same as Vs voltage which on label of panel right/top
(deviation ; ±0.5V)

1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D.M.M. to Va pin of P811, connect

-terminal to GND pin of P811.

3) After turning VR901,voltage of D.M.M adjustment as

same as Va voltage which on label of panel right/top
(deviation; ±0.5V)

1) Connect + terminal of D. M..M. to Vs pin of P811,

connect -terminal to GND pin of P811.

2) After turning VR951, voltage of D.M.M adjustment as

same as Vs voltage which on label of panel right/top
(deviation ; ±0.5V)

1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D.M.M. to Va pin of P11, connect

-terminal to GND pin of P11.

3) After turning VR901,voltage of D.M.M adjustment as

same as Va voltage which on label of panel right/top
(deviation; ±0.5V)

1) Connect + terminal of D. M..M. to Vs pin of P11, connect

-terminal to GND pin of P11.

2) After turning VR951, voltage of D.M.M adjustment as

same as Vs voltage which on label of panel right/top
(deviation ; ±0.5V)

(Fig. 1) 50inch Power PCB Assy Voltage Adjustment

(Fig. 2) 42inch Power PCB Assy Voltage Adjustment

(Fig. 3) 60inch Power PCB Assy Voltage Adjustment

- 9 -

(MODEL NAME:  LG TV(Not necessary))

Caution: Please only check write status in Instart-menu

- EDID download is processed automatically through CPU at initial booting
- PC(for communication through RS-232C), UART baud rate: 115200 bps

(1) RGB EDID DATA

0

1           2         3         4         5         6         7           8           9         A         B         C         D         E         F

————————————————————————————————————————————

/* 0 */ 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x1E, 0x6D, 0x01, 0x00, 0x01, 0x01, 0x01, 0x01,
/* 1 */ 0x00, 0x11, 0x01, 0x03, 0x18, 0x73, 0x41, 0x96, 0x0A, 0xCF, 0x74, 0xA3, 0x57, 0x4C, 0xB0, 0x23,
/* 2 */ 0x09, 0x48, 0x4C, 0xAF, 0xCF, 0x00, 0x31, 0x40, 0x45, 0x40, 0x61, 0x40, 0x81, 0x80, 0xA9, 0x40,
/* 3 */ 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xB0, 0x51, 0x00, 0x1B, 0x30, 0x40, 0x70,
/* 4 */ 0x36, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x1E, 0x02, 0x3A, 0x80, 0x18, 0x71, 0x38, 0x2D, 0x40,
/* 5 */ 0x58, 0x2C, 0x45, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x1E, 0x00, 0x00, 0x00, 0xFD, 0x00, 0x30,
/* 6 */ 0x4B, 0x1F, 0x64, 0x11, 0x00, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xFC,
/* 7 */ 0x00, 0x4C, 0x47, 0x20, 0x54, 0x56, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xFF,
/* 8 */ 0x02, 0x03, 0x04, 0x00, 0x0E, 0x1F, 0x00, 0x80, 0x51, 0x00, 0x1E, 0x30, 0x40, 0x80, 0x37, 0x00,
/* 9 */ 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x1C, 0xF1, 0x27, 0x00, 0xA0, 0x51, 0x00, 0x25, 0x30, 0x50, 0x80,
/* a */ 0x37, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x1C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* b */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* c */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* d */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* e */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* f */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x31,

(2) HDMI-1 EDID DATA

0

1           2         3         4         5         6         7           8           9         A         B         C         D         E         F

————————————————————————————————————————————

/* 0 */ 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x1E, 0x6D, 0x01, 0x00, 0x01, 0x01, 0x01, 0x01,
/* 1 */ 0x00, 0x11, 0x01, 0x03, 0x80, 0x73, 0x41, 0x96, 0x0A, 0xCF, 0x74, 0xA3, 0x57, 0x4C, 0xB0, 0x23,
/* 2 */ 0x09, 0x48, 0x4C, 0xAF, 0xCF, 0x00, 0x31, 0x40, 0x45, 0x40, 0x61, 0x40, 0x81, 0x80, 0xA9, 0x40,
/* 3 */ 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xB0, 0x51, 0x00, 0x1B, 0x30, 0x40, 0x70,
/* 4 */ 0x36, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x1E, 0x02, 0x3A, 0x80, 0x18, 0x71, 0x38, 0x2D, 0x40,
/* 5 */ 0x58, 0x2C, 0x45, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x1E, 0x00, 0x00, 0x00, 0xFD, 0x00, 0x30,
/* 6 */ 0x4B, 0x1F, 0x64, 0x11, 0x00, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xFC,
/* 7 */ 0x00, 0x4C, 0x47, 0x20, 0x54, 0x56, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0x97,
/* 8 */ 0x02, 0x03, 0x1B, 0xF1, 0x47, 0x84, 0x05, 0x03, 0x02, 0x20, 0x22, 0x10, 0x26, 0x15, 0x07, 0x50,
/* 9 */ 0x09, 0x07, 0x07, 0x67, 0x03, 0x0C, 0x00, 0x10, 0x00, 0xB8, 0x2D, 0x01, 0x1D, 0x00, 0x72, 0x51,
/* a */ 0xD0, 0x1E, 0x20, 0x6E, 0x28, 0x55, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x1E, 0x01, 0x1D, 0x80,
/* b */ 0x18, 0x71, 0x1C, 0x16, 0x20, 0x58, 0x2C, 0x25, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x9E, 0x8C,
/* c */ 0x0A, 0xD0, 0x8A, 0x20, 0xE0, 0x2D, 0x10, 0x10, 0x3E, 0x96, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 
/* d */ 0x18, 0x8C, 0x0A, 0xD0, 0x8A, 0x20, 0xE0, 0x2D, 0x10, 0x10, 0x3E, 0x96, 0x00, 0x13, 0x8E, 0x21, 
/* e */ 0x00, 0x00, 0x18, 0x0E, 0x1F, 0x00, 0x80, 0x51, 0x00, 0x1E, 0x30, 0x40, 0x80, 0x37, 0x00, 0xC4, 
/* f */ 0x8E, 0x21, 0x00, 0x00, 0x1C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xBD,