LG 20lc1r Service Manual

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9. Preset CH information
PIF[MHz] SYSTEM VideoSound
TXT NAME
System Mode
LGE KUMI PR 0 45.25  PAL-BG PHILIPS MONO C 01
PR 1 575.25  SECAM-DK DIGITAL DUAL C 34
PR 2 175.25  PAL-BG PHILIPS STEREO FLOF C 05
PR 3 231.25  PAL-I FUBK MONO S 11
PR 4 675.25  NTSC-M DIGITAL MONO C 48
PR 5 62.25  SECAM-BG PHILIPS DUAL C 04
PR 6 189.25  PAL-BG Crosshatch NICAM DUAL FLOF C 07
PR 7 703.25  PAL-BG RGB, WHITE MONO C 50
PR 8 719.25  PAL-BG MATRIX C/B NICAM STEREO C 52
PR 9 631.25  PAL-I PHILIPS NICAM STEREO C 41
PR 10 807.25  PAL-I Crosshatch NICAM STEREO C 48
PR 11 102.25  PAL-BG RED MONO BLN2
PR 12 55.75  PAL-L Crosshatch MONO C 02
PR 13 152.75  PAL-L PHILIPS NICAM DUAL S 07
PR 14 591.25  PAL-L Colorbar NICAM STEREO C 48
LGEMA PR 31 175.25  PAL-B Crosshatch+Circle NICAM DUAL FLOF C 05
PR 32 711.25  PAL-G DIGITAL NICAM STEREO FLOF C 51
PR 33 631.25  PAL-I Crosshatch NICAM STEREO FLOF C 41
PR 34 93.25  SECAM-D DIGITAL MONO C 05
PR 35 62.25  PAL-B Crosshatch A2 STEREO C 04
PR 36 551.25  PAL-G Colorbar A2 DUAL TOP C 31
PR 37 471.25  PAL-I DIGITAL STEREO FLOF C 21
PR 38 855.25  PAL-I DIGITAL MONO FLOF C 69
PR 39 687.25  NTSC-M Crosshatch+Circle MONO C 50
PR 40 200.25  SECAM-L DIGITAL MONO C 08
PR 41 663.25  SECAM-L DIGITAL NICAM DUAL C 45
PR 42 503.25  PAL-B Crosshatch(16:9) MONO FLOF C 25
PR 43 687.25  NTSC-M DEM+Circle MONO C 50
PR 44 189.25  PAL-B STEREO C 07
PR 45 327.25  PAL-D A2 STEREO FLOF S 24
PR 46 615.25  PAL-B NICAM STEREO FLOF C 39
LGEWA PR 61 45.25  PAL-BG Monoscope MONO FLOF C 01
PR 62 575.25  PAL-DK Monoscope NICAM STEREO FLOF C 34
PR 63 175.25  PAL-BG SMPTE MONO C 04
PR 64 231.25  PAL-I Colorbar NICAM DUAL S 11
PR 65 62.25  PAL-BG White Raster MONO C 04
PR 66 189.25  SECAM-DK Monoscope MONO FLOF C 07
PR 67 703.25  SECAM-DK White Raster MONO C 50
PR 68 719.25  PAL-BG Crosshatch+Circle MONO C 52
PR 69 591.25  SECAM-L Colorbar NICAM STEREO C 36
LGENT PR81 67.25 Color Bar 400Hz
TXT, V-CHIPUS-4
PR82 211.25 NTSC Philips 1Khz US-13
PR83 471.25 Monoscope Sweep US-14
PR84 175.25 Philips 1Khz E-5
PR85 503.25 PAL-B/G Color Bar(2) Ger,Stereo 1K,3Khz FLOF E-25
PR86 623.25 Monoscope Sweep G-40
PR87 49.75 SECAM D/K Color Bar(2) 400Hz D-1(CIS)
PR88 200.25
PAL-D/KColor Bar Sweep
D-10(China 10)
PR89 695.25 Philips CHI Dual 1K, 3Khz FLOF K-36
 
						

							- 12 -
1. Application
This document is applied to 20.1 LCD TV which is
manufactured in Monitor Factory or is produced on the basis
of this data. 
2.  Designation
2.1 The adjustment is according to the order which is
designated and which must be followed, according to the
plan  which can be changed only on agreeing.
2.2. Power Adjustment : Free Voltage
2.3. Magnetic Field Condition: Nil.
2.4. Input signal Unit : Product Specification Standard 
2.5. Reserve after operation : Above 30 Minutes 
2.6. Adjustment equipments : Pattern Generator (MSPG-925L
or Equivalent), DDC Adjustment Jig equipment, SVC
remote controller 
3. Adjustment
In order to enter to IIC_SW, press IN-START key by
using SVC remote controller and press VOL+ at ETC,
after then, locate menu bar on IIC_SW menu and
change 0 or 1 by using VOL+ or VOL- Key.
-IIC_ SW1 : Factory default (Shipping condition),
DDC Communications(DDC2B)
- IIC_ SW0: ADC calibration with auto adjustment
equipment.
*Menu(Local Key) + Menu(Remote controller:
6710T00022D) => Enter SVC Mode
3.1 Board Assembly line process
The machine can be adjusted by itself automatically but
even for self -adjustment it needs someone to operate it. 
3.1.1 ISP Process ; UOC file 
(Main board check process) 
At first, APC after manual inserting and inspection.
And ISP needs to check main board Assy.
3.1.1.1 Required Equipment
JIG for ISP or  ( ISP JIG for SVC and LIPS )
PC that is installed with  WISP program. 
Control + Power LED PCB Assy
3.1.1.2  ISP Sequence
1) Connect  main board with  JIG for ISP
2) Execute WISP Program.
3) Compare UOC version with version of hex file.
4) Push Brouse... button and select hex file.
5) Push   Auto Execute button.
6) Occur an Error, try again and again. 2)~5)3.1.2 ADC Process (Board Adjustment line process)
1) Auto Gain/Offset Adjustment 
Convert to AV in Input-Mode
Signal equipment displays 0.7V, 16 Step Gray pattern.
(Model:202, Pattern: 29 at MSPG925L)
- Output Voltage  :  700  mVp-p
- Impress  Resolution 576i and gray pattern that
left & right is black and center is white signal
which follows in the MSPG925L.
Adjust by commanding AUTO_COLOR_ADJUST
(0xF1) 0x00 0x00 instruction.
2) Confirmation : Adjustment process
We confirm whether 0x01 address of EEPROM
0xA0 is 0xAA or not. 
If 0x01 address of EEPROM 0xA0 isnt 0xAA, we
adjust once more in adjustment line by adjust method
of 1). 
We can confirm the ADC values from 0x0C~0x11
addresses in a page 0xA0 
3.1.3 DCXO Adjustment
3.1.3.1 DCXO Adjustment : 
Convert to AV in Input-Mode
Signal equipment displays 0.7V, 8 Step color pattern.
(Model:202, Pattern: 38 at MSPG925L)
- Output Voltage  :  700  mVp-p
- Impress Resolution 576i and Color pattern which
follows in the MSPG925L. 
Adjust by commanding AUTO_DCXO (0xFC) 0x00 0x00
instruction.
* Caution*
If DDC CMD do nt  work, please check below.
1. Enter SVC menu by  SVC Remote controller
2. Enter ETC menu
Check please,  IIC_SW is 0 or 1.
- IIC_SW  0 : ADC calibration with auto adjustment equipment..
- IIC_SW  1 : Factory default (Shipping condition), DDC
Communications(DDC2B).
3.1.4 Function Check
IIC_SW should set to 1
Check DDC communications (DDC2B)
Check display and sound  (cf. work instructions)
Check Input and Signal items.
1. TV
2. AV1 (SCART)
3. AV2 (CVBS/ S-Video)
4. Speaker  & H/P Output
**After Fuction Check , IIC_SW should set to 0
ADJUSTMENT INSTRUCTION
 
						

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3.2 Total Assembly line process
3.2.1 Adjustment Preparation
IIC_SW should set to 0
Above 30 minutes H/run in RF no signal
3.2.2 Confirmation of Luminance
Set Statement
Input : AV2
PSM : Dynamic
CSM : Normal
Signal equipment displays
Output Voltage  :  700  mVp-p
Output Mode    :  Full White pattern
Confirm whether luminance is over  350 cd/m2  or not
3.2.3 Confirmation of Color Coordinate
Input Full White Pattern (AV2-CVBS)
Set CSM : Normal (9300K)
Confirm whether x=0.283±0.03, y=0.298±0.03 or not
* After Confirming color coordinate and luminance, IIC_
SW should set to 1
3.2.4 Other quality
Confirm that each items satisfy under standard
condition that was written product spec.
- Confirm Video and Sound at each source
1) AV 
- Select input AV1 and whether picture is displayed or
not
: SCART output displayed or not
- Select input AV2 (CVBS) and whether picture is
displayed or not
- Select input AV2 (S-video) and whether picture is
displayed or not
2) TV
Select input TV and check below item
1) In Gumi Factory
- C05 (E05) - TELETEXT Function Check
;(Applicable to the model that has Teletext
code set-up item in Product spec)
- C07 (E07) - Nicam DUAL Check
- C 52 (E52) - Nicam Stereo Check
*Preset CH information*
3.2.5 Stand by operation confirmation : 
Check if Power LED Color and Power Consumption
operates as standard.
Measurement Condition : 230V@ 50Hz (Analog)
3.3 Option configuration
Press IN-START Key by using the SVC Remote
Controller and Press option value, after then, configure
the option data that is written in the product spec and
press MENU key.
After option configuration is complete, Press VOL+ at all
reset menu
Amber LED is blink. And then Automatically turn off. .
(Must not AC OFF during blink) 
3.4 OPTION DATA SETTING(SVC OSD SETTING)
No ItemConditionRemark
Option1
1 ACMS Yes
2 TEXT FLOF TOP / FLOF
3 CH+AU NO NO : Except below area
YES : China, Australia
4 AGC-L NO
Option2
1 A2 ST NO
2 I II SAVE NO
3 V-Curve
Option3
1 Default Lang 0 According to Suffix
2 Lang Group 1 1: English /Germany/France/Italy/Spain
/Nederland/Sweden/Norway/Denmark
/Finland/Portugal/Romania/Poland
/Hungary/Czech/Russia
2: English / CHINA
3: English /ARAB
4: English /PARSI
3 TXT Lang 0 0 : West EU 
(E,GER,SWE,ITA,FRE,SPA,TUR)
1 : East EU 
(POL,GER,ESTO,SLOV,CHEC,RUMA)
2 : Cyrillic 
(POL,GER,ESTO,LETT,RUSS,SLOV)
3 : Cyrillic2 
(POL,GER,SWE/HUNG,RUSS,CHEC,Slov,ESTo)
4 : Arabic (E,FREN,TURK,ARAB)
Option4
1
2 hour Off OptYes
2
Navigation KeyNo
3 Favorite key No
 
						

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SVC REMOCON
NO. KEY FUNTION REMARK
1 POWER To turn the TV on or off
2 MUTE To activate the mute function.
3 P-CHECK To check TV screen image easily. Shortcut keys
4 S-CHECK To check TV screen sound easily Shortcut keys
5 ARC(23inch) To select size of the main screen  Shortcut keys
(Auto, 4:3, 16:9, 14:3, Zoom, Cinema Zoom)
6 CAPTION Switch to closed caption broadcasting
7 TXT To toggle on/off the teletext mode
8 TV/AV External input
9 IN-START To enter adjustment mode when manufacturing the TV  sets.
Use the AV key to
In-StartVol±Auto ADCVol±W/B adjustmententer the screen W/B
Exit two times(Adjustment completed)adjustment mode.
10 MPX To select the multiple sound mode 
(Mono, Stereo or MPEG, DOLBY, Digital)
11 EXIT To release the adjustment mode
12 APC(PSM)
To easily adjust the screen according to surrounding brightness
13 ASC(SSM) To easily adjust sound according to the program type
14 MULTIMEDIA External input Shortcut keys
15 CH ±
To move channel up/down or to select a functiondisplayed on the screen.
16 VOL ± To adjust the volume or accurately control a specific function.
17 ENTER To set a specific function or complete setting.
18 CH-(OP1) To use as a red keyin the teletext mode
19 CH+(OP2) To use as a green keyin the teletext mode
20 SWAP(OP3) To use as a yellow keyin the teletext mode
21 INPUT(OP4) To use as a blue keyin the teletext mode
22 MENU
To select the functions such as video, voice, function or channel.
23 IN-STOPTo set the delivery condition status after manufacturing the TV set.
24 HOLD
Used as a hold key in the teletext mode (Page updating is stopped.)
25 TIME Displays the teletext time in the normal mode 
Enables to select the sub code in the teletext mode
26 SIZE Used as the size key in the teletext mode
27 INDEX Used as the index key in the teletext mode 
(Top index will be displayed if it is the top text.)
28 UPDATE Used as the update key in the teletext mode 
(Text will be displayed if the current page is updated.)
29 MODE Used as Mode in the teletext mode
30 TILT
To set IIC SW 0 or 1 in the adjustment mode
31 0~9 To manually select the channel.
 
						

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TROUBLESHOOTING
No power 
(LED indicator off)
Check short of main B/D 
or Change Lips
Change U406
Change LED Assy
Check 15V or 5V 
of Lips
Check Output of 
U406
Check LED Assy
Check J103, J125, J126
Connector 
Fail
Fail
Change Q402Check Output of 
Q402
Fail
Pass
Fail
Pass
Pass
Pass
:[A]Process
 
						

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No Raster
Check LED Status 
on display unit
Check the input/
Output of U301
Check 
U401~U405, U407, U409
Check inverter
Connector or inverter
Check input source cable and jack 
Repeat A PROCESSFail
Change U401~U405,
U407, U409
Fail
Change U301Fail
Change inverter
connector or inverter
Fail
Change panel link
cable or module
Fail Check panel link 
Cable or module
Pass
Pass
Pass
Pass
Pass
:[B]Process
 
						

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No Raster on AV Signal
(SCART, CVBS, S-VHS)No Raster on TV(RF) signal
Change L108, L109, 
L110, L112, R194, R198,
R184Check the signal of 
L108, L109, L110, L112
R194, R198, R184
Repeat
[A] Process Check the output of 
TU701
Check the
input/output  of U301
Check the 
input/output of U101
Check input source cable and  jack 
Fail
FailFail
Fail
Re-soldering or
Change the defect part
Check X301
Fail
Re-soldering or
Change the defect part
Check 5V, 33V of TU701
Re-soldering or 
Change the defect part
Pass
Pass
Pass
Pass
 
						

							- 18 -
No Sound
Check the speaker wire
Change source inputCheck the 
input source
Fail
Pass
Re-soldering or 
Change the defect part
Check X301Check the input/output 
of U301
Fail
Pass
Re-soldering or 
Change the defect partCheck the input/output 
of U201
Fail
Pass
Change speakerCheck the speakerFail
Pass
 
						

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BLOCK DIAGRAM
 
 
						

							- 20 -
BLOCK DIAGRAM DESCRIPTION
Power Supply Block (LIPS)
This Block Generates DC Voltage (5V,15V) to Main
Control system from AC Power (100-240 V, 50/60 Hz,
1.0A)
Also it has the inverter function that converts input
voltage to AC Rms value for the LCD lamp.
DC/DC Converter block 
DC/DC Converter convert the input 5V,15V to proper
3.3V, 5V, 8V, 12V for Main control system.
For shooting heat trouble, we use the DC/DC
converting IC
Audio Amplifier
This block is composed of TPA3005D2 and peripheral
device.
The function of the audio amplifier is that to amplify
audio L / R signal transmitted from audio decoder. The
audio signal is amplified according to pre-defined DC
volume control curve.
Audio / Video / IF Decoder / Scaler
This block is composed of LOC1 and peripheral
devices.
1) Video Decoder
This Block Selects input Video signals (like CVBS, Y/C,
SCART RGB) and output RGB signal.
On decoding, We can control signal like Contrast,
Brightness, Sharpness, Color, tint signals including
Adaptive Comb Filter
2) Audio Decoder
This block analyzes audio input signal through A/V Jack
and PC audio and Tuner IF.
The analyzed signals transmitted to audio amplifier 
On decoding, We can control signal like Bass, treble.
3) IF Decoder
This block can change IF signal to audio and video
signal that transmitted to Video/audio decoder.
4) Scaler
This IC includes A/D Converter and LVDS Transmitter 
This IC is directly Inputted Analog Signal and transmits
it to LCD Module
5) Micom 
This block controls each IC through IIC communication
line.LVDS Rx (DTC34LF86L)
It is composed of DTC34LF86L/THC63LVDF84B.
The LVDS Rx converts the LVDS data streams back
into 24bits of CMOS/TTL data with
Falling edge or rising edge clock for convenient with
variety of LCD panel controllers.
Switch IC (PI3V512QE)
It is composed of PI3V512QE.
This IC selects between D-sub RGB signal and LOC1
RGB signal, and it transmits the selected signal to
video signal processor.
TUNER
Micom controls this through IIC Line.
TUNER makes IF and transmits IF signal to LOC1.