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Model
50PQ20-UA (CHASSIS:PU92A)
Pages
57
Size
12.03 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / Plasma
File
50pq20-ua-chassis-pu92a.pdf
Date
PREV: LG 50PQ20D-AA (CHASSIS:PA91A) Service Manual

LG 50PQ20-UA (CHASSIS:PU92A) Service Manual ▷ View online

- 7 -
4. ADC Process
4-1. PC Input ADC
(1) Auto RGB Gain/Offset Adjustment
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.
(2) Confirmation
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 “. 
4-2. COMPONENT Input ADC
(1) Component Gain/Offset Adjustment
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”. 
4-3. Confirmation
(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.
5. DDC EDID Write Confirmation
- 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.
6. POWER PCB Ass’y Voltage 
Adjustment
(Va, Vs voltage Adjustment)
6-1. Test Equipment:
D.M.M 1EA
6-2. Connection Diagram for Measuring
Refer to Fig.1, Fig 2, Fig 3
6-3. Adjustment Method 
(1) 50” Va Adjustment (refer fig.1)
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)
(2) 50” Vs Adjustment (refer fig.1)
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)
(3) 42” Va Adjustment (refer fig.2)    
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)
(4) 42” Vs Adjustment (refer fig.2)
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)
(5) 60” Va Adjustment (refer fig.3)    
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)
(6) 60” Vs Adjustment (refer fig.3)
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 -
7. DDC EDID Write 
(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
7-1. HD EDID DATA
(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,
- 10 -
(3) HDMI-2 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, 0x20, 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, 0xAD,
(4) HDMI-3 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, 0x30, 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, 0x9D,
(5) HDMI-4 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, 0x40, 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, 0x8D,
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