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Roadstar
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lcd 2040
schematic
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Roadstar lcd 2040 schematic

R
- LCD-2040
- LCD-2040
LCD-2040
Service Manual
Service Manual
LCD-2040KLTN Spare Parts Pric List
No Description (Tae Young Telstar) U/P
1 FRONT PANEL $6,00
2 FRONT PANEL KNOB ASS'Y $0,90
3 CONTROL PCB ASS'Y $0,80
4 SPEAKER $1,00
5 MAIN SPEAKER $1,00
6 TWITTER SPEAKER $1,50
7 LCD PANEL $560,00
8 SHIELD CASE $6,00
9 MAIN PCB ASS'Y $67,00
IC IMAGE SCALLER, MX88L284AEC
IC AUDIO AMP , TDA8542AT / 20 PIN
46
48
$9,80
$1,10
SERVICE MANUAL
1. Detail Specification 1-1. PANEL 1-2. IN/OUT JACK 1-3. User Interface Specification 1-4. Electrical Specification 1-5. Available PC Input Mode & Video Timing Standard 1-6. OSD Specification ( America ) 1-7. OSD Specification ( *** ) 1-8. Factory mode OSD Specification
2. Adjustment Specification 2-1. Adjustment of CLOCK DELAY 2-2. Adjustment of AUTO COLOR GAIN 2-3. Setting Instruction of OPTION 2-4. Adjustment Instruction of VPC3230
3. Inspection Specification 3-1. Inspection of LCD PANEL 3-2. Inspection of INVERTOR 3-3. Inspection of ASSY-CONTROL 3-4. Inspection of ASSY-MAIN
4. Block Diagram
5. Circuit Diagram
6. General Specification
7. Troubleshooting
8. Parts List
- Contents -
9. Main PCB Drawing
SERVICE MANUAL
1. Detail Specification
1-1. LCD Panel
LG-Philips LCD Panel : LC151X01-A3 : 15.1"( Panel Link Type ) LC201V1-A3 : 20.1"
1-2. In/Out Jack
Power Supply Input : Din Jack Antenna Input : 75ohm Unbalanced Din-Jack Type PC Input : 15pin D-sub Jack ( Female Type ) PC Audio Input : Phone Jack ( Stereo Type ) Composite Video In : RCA Jack DVD In : RCA Jack (Y, Cb, Cr) - * 20.1" Model Only S-Video In Audio Input : RCA Jack ( When Composite or S-Video input ) EURO SCART Jack Head-Phone Output Jack : Phone Jack ( When the Jack insert, Main Sound is mute. ) Audio Out : RCA Jack ( Monitor Out ) Video Out : RCA Jack ( Monitor Out )
SERVICE MANUAL
1-3. User Interface
7 Panel Key Power , Menu , Select , Vol Up , Vol Down , CH Up , CH Down 3 Color LED Red : Stand by Condition Green : Power On Condition Scarlet : SLEEP TIME On Condition Green Blink : When the PC Mode, Inserted D-sub Jack but H,V Sync is not input or PC Power Save Mode Remocon Receiver Remocon ( Pal ; 41Key, NTSC ; 29Key ) On Screen Display Control using OSD OSD Language : English, German, Italian etc. Plug & Play : DDC - 1/2B Factory Mode Mode for controlling the adjustment item & Panel Option in mass production
SERVICE MANUAL
1-4. Electrical Specification
TV Color Standard : PAL,SECAM ( NTSC System : NTSC ) TV Sound Standard : B/G,I,D/K ( NTSC System : M ) TV Stereo Sound : NICAM Stereo , A2 Stereo ( NTSC System : BTSC ) TV Receiving Range : VHF LOW( 2 ~ H ), VHF-HIGH( I ~ W+26 ), UHF (W+27~78)
Total 100CH ( NTSC System : 181CH ) Sound Output : RMS 1.5W X 2CH Power Supply : AC / DC Adaptor ( DC12V , 5A , 50 /60 HZ ) Input Power : AC 100V ~ 265V Power Consumption : Stand-by : 3W , Power On : 45W Video Input Level : 1 Vp_p , 75 ohm Audio Input Level : 500mVrms PC Input Level : Analog RGB Input ( H,V Separator ) See 1-5. Available PC Input Mode & Video Timing Standard. Audio Output Level : 500mVrms Head-Phone Output Level : 100mW
SERVICE MANUAL
1-5. Available PC Input Mode & Video Timing Standard
Resolution Horizontal Vertical Clock Time
H V ( KHz ) Pol. ( Hz ) Pol. ( MHz ) ( nsec )
IBM 640 350 31.469 P 70.087 N 25.175 39.722
IBM 640 480 31.469 N 59.940 N 25.175 39.722
VESA 640 480 37.861 N 72.809 N 31.500 31.746
VESA 640 480 37.500 N 75.000 N 31.500 31.746
VESA 640 480 43.269 N 85.008 N 36.000 27.778
IBM 720 400 31.465 N 70.087 P 28.322 35.308
VESA 800 600 31.156 N/P 56.250 N/P 36.000 27.778
VESA 800 600 37.879 P 60.317 P 40.000 25.000
VESA 800 600 48.077 P 72.188 P 50.000 20.000
VESA 800 600 48.875 P 75.000 P 49.500 20.202
VESA 800 600 53.674 P 85.061 P 56.250 17.778
VESA 1024 768 48.363 N 60.004 N 65.000 15.358
VESA 1024 768 56.476 N 70.069 N 75.000 13.333
VESA 1024 768 60.023 P 75.029 P 78.750 12.698
Remarks
VGA
SVGA
XGA
VESA 1024 768 68.677 P 84.997 P 94.500 10.582
SERVICE MANUAL
1-6. OSD Specification
PICTURE CONTRAST BRIGHTNESS COLOR TEMPERAT ( PC input mode only ) STANDARD , 6500K , USER, RESET , 9300K SHARPNESS ( Not Available PC MODE ) COLOR ( Not Available PC MODE ) TINT ( NTSC System Only ) SOUND BASS TREBLE BALANCE MTS ( S.MODE ) GEOMETRY ( PC input mode only ) H-POSITION V-POSITION AUTO POSITION
FUNCTION TRACKING ( PC input mode only ) AUTO TRACKING CLOCK PHASE INFORMATION TUNING ( TV input mode only ) SORT AUTO TUNING MANUAL TUNING FINE TUNING CH SKIP LANGUAGE ( PAL/SECAM System ) CAPTION ( NTSC System )
V-CHIP ( NTSC System )
SERVICE MANUAL
SERVICE MANUAL
1-8. Factory Mode OSD Specification
How to use Factory Mode Press Power & Select Key in Panel Control key, and go to Factory mode. Factory ADJ CLOCK DELAY AUTO COLOR GAIN OPTION TTX LOCAL TTX E/W MX88L281 1 AD9884 1 ( PC input mode only ) AD9884 2 ( PC input mode only ) SUB C VCP SUB C CHG CURRENT INIT VCO CURRENT VPC3230 ( excluding PC MODE ) CONTRAST BRIGHTNESS PEAKING CIP CONTRAST CIP BRIGHT ** In mass production, adjust only Factory ADJ item, do not adjust other Modes.
( In the time of variation of A/S & initial condition of screen quality , built in other Modes for controlling )
SERVICE MANUAL
2. Adjustment Instruction ( Factory ADJ )
2-1. Adjustment instruction of CLOCK DELAY
1. Adjustment item : Adjust the dispersion happening in the time of matching ASSY-MAIN and LCD PANEL . (As the contact status of the CONNCETOR for connecting LCD PANEL, dispersion happens )
2. Adjustment Process : After assembling the SET , do the adjustment.
3. Preliminary adjustment :
1) Connect the outlet VIDEO PATTERN GENERATOR ( ANALOG RGB & SEPARATE H,V OUT ) to INPUT ( 15PIN D-sub with VGA CABLE )
2) TEST PATTERN: 1DOT BLACK, Select WHITE PATTERN. ( In the case of the tool of MSPG-925L, select PATTERN NO.28 )
3) Select Output FORMAT into 1024 x 768 @85HZ. (Select MODEL : 21)
4) Turn on the SET, and them select in PC MODE.
4. Adjustment Instruction :
1) Press SEL & Power Key in Front panel at the same time , go to Factory mode
2) Select CLOCK DELAY ( including in FACTORY ADJ MENU ) with CH UP/DOWN KEY in Factory mode
3) Changing the level of CLOCK DELAY with VOL UP/DOWN KEY, adjust to the noiseless level in screen ( variable range : 0 ~ 15, DEFAULT : 15 )
SERVICE MANUAL
2-2. Adjustment Instruction of AUTO COLOR GAIN
1. Adjustment Item : Function of automatically setting ADC LEVEL of AD9884 with ANALOG RGB ( D-sub ) signal . ( WHITE BALANCE & CONTRAST adjustment )
2. Adjustment Process : After assembling the SET , do the adjustment .
3. Preliminary Adjustment : 1) Connect Outlet of VIDEO PATTERN GENERATOR to the input terminal of CVBS.
2) TEST PATTERN : Select COLOR BAR PATTERN
3) Turn on the SET, and then select in VIDEO MODE.
4. Adjustment Instruction : 1) Press SEL & Power Key in Front Panel at the same time, and go to Factory mode.
2) In Factory mode, select Auto Color Gain in Factory ADJ.
3) Press VOL UP KEY , and then displaying the phrase " Processing " , AUTO Adjustment start
4) When adjustment is completed , the phrase " Processing " disappears => caution : In the course of Processing, do not remove the signal.
SERVICE MANUAL
2-3. Setting Instruction for OPTION
1. OPTION : - X2 - BYPASS => Using 6 BIT PANEL => Back-Light Control of Inverter ( Bright Max : LOW , Min : HIGH )
2. OPTION : - X2 - INVERT => Using 6 BIT PANEL => Back-Light Control of Inverter voltage polarity ( Bright Max : HIGH , Min : LOW )
3. OPTION : - X3 - BYPASS => Using 8 BIT PANEL => Back-Light Control of Inverter voltage polarity ( Bright Max : LOW , Min : HIGH )
4. OPTION : - X3 - INVERT => Using 8 BIT PANEL => Back-Light Control of Inverter voltage polarity ( Bright Max : HIGH , Min : LOW )
Select no 4 in the case that no 4 is not selected .
SERVICE MANUAL
2-4. Adjustment Instruction of VPC3230
1. Adjustment item : Function of adjusting DEFAULT VALUE of VPC3230 DEVICE.
2. Adjustment process : After assembling the SET, do the adjustment .
3. Preliminary adjustment : 1) Connect Outlet of VIDEO PATTERN GENERATOR to the input terminal of CVBS.
2) TEST PATTERN : Select COLOR BAR PATTERN
3) Turn on the SET, and then select in VIDEO MODE.
4. Adjustment Instruction : 1) Press SEL & Power Key in Front Panel at the same time , and go to Factory mode.
2) Select VPC3230 in Factory mode.
3) Adjust to the following levels with VOLUME UP/DOWN, CH UP/DOWN
- CONTRAST 52
- BRIGHT 9
- PEAKING 0
- CIP CONTRAST 7
- CIP BRIGHT 7
No need to adjust when the SET is stable
.
SERVICE MANUAL
3. Inspection Specification
3-1. Input Specification of LCD PANEL ( Total Inspection )
Inspection Procedure Standard Remark
1 Turn off the power of JIG ( check the power of JIG )
2 Connect BACK LIGHT CONNECTOR of LCD PANEL to JIG
3 Connect PANEL Connector of JIG to LCD PANEL
4 Turn on the power of JIG POWER ON
5 After receiving Black Pattern, check the number of radiant Pixel No the matter
6 After receiving White Pattern, check the number of radiantless Pixel 2 Pixel and less
7 After receiving White Pattern, check the spots No the matter
8 Turn off the power of JIG
9 Disconnect PANEL Connector
10 Disconnect Back Light Connector
1) In order to prevent the spots of PANEL, inspect with Gloves on
RMK
2) In the time of connecting & disconnecting the Connector, surely turn off the power of JIG,
and then go on the inspection.
3) Test Pattern : Full White & Full Black Pattern
SERVICE MANUAL
3-2. Inspection Specification of INVERTOR ( Total inspection )
Insepction procedure Standard
1 Turn off the power of JIG ( check the power of JIG )
2 Connect 2P CONNECTOR in the upper part of JIG to CN3 Back-Light Con'
3 Connect 2P CONNECTOR in the lower part of JIG to CN2 Back-Light Con'
4 Connect 5P CONNECTOR of JIG to CN1 Inverter Con'
5 Turn on the power of JIG POWER ON
6 Check the screen is displaying normally
7 Change “ Brightness” and check the variation of brightness level
8 Turn off the power of JIG
9 Disconnect the Connector
1) TEST PATTERN : White / Black Pattern
RMK
2) In the time of connection & disconnection the CONNECTOR,
surely turn off the power of JIG , and then go on inspection
=> warning : pay attention to high voltage
SERVICE MANUAL
3-3. Inspection specification of ASSY-CONTROL
Inspection procedure standard Remark
1 Turn off the power of JIG ( check the power of JIG )
2 Connect 7P Connector with JIG
3 Check the tight insertion of TACT SW Tight insertion
4 Turn on the power of JIG.
5 Check the color of LED is red STAND BY : RED LED
6
Press POWER KEY , and then check the screen is displaying & LED is lighting in green .
7 Press each KEY and check the function CHECK key SW
8 With REMOTECON , turn off the power Check REF LED
9 Turn off the power of the JIG
10 Disconnect the Connector
1) After checking the connecting status of 15PIN in JIG , go on the inspection
RMK
: in case of no sign , KEY may not work .
POWER ON : GREEN LED
SERVICE MANUAL
Operating procedure OSD specification
1. POWER KEY setting
2. MENU KEY setting
3. SELECT KEY setting
4. KEY setting
5. KEY setting
6. KEY setting
7. KEY settinh
=>
POWER ON
SERVICE MANUAL
3-4. INSPECTION SPECIFICATION OF ASSY-MAIN
3-4-1 INSPECTION IN TV MODE
1. Required tool : PM5518 ( RF PATTERN GENERATOR – built in SAP function) , simple JIG
2. Preliminary inspection : 1) set up PM5518 : RF FREQ' : 55.25MHZ ,
PATTERN : COLOR BAR ,SOUND : STEREO ( 3KHZ/1KHZ), SYSTEM : PAL/NTSC - 6 (REAR PANEL) RF GAIN :60dBuV
3. Inspection procedure :
1) Inserting Connector
2) Power on the JIG , POWER ON the Set.
3) TUNING ( in case of NTSC, select channel 2, in case of PAL/SECAM , AUTO TUNING
: select the stored channel .
4) Check COLOR & the sound of SPEAKER ( L : 3KHZ , R : 1KHZ )
5) Changing VOLUME , check up & down of sound ( VOLUME 0 : MUTE , others : LEVEL up & down )
6) With MUTE KEY of REMOCON , Check MUTE function
7) With MTS KEY of REMOCON, after converting to MONO, check SOUND
8) When converting " CONTRAST" in PICTURE MENU , check the conversion of light & darkness in screen
9) When converting " BRIGHTNESS" of PICTURE MENU , check the conversion of brightness in screen
10) When converting " COLOR" of PICTURE MENU, check COLOR GAINING ( 0 : NO COLOR )
11) In the time of change " TINT" in PICTURE MENU , check COLOR VARIATION.
12) With P.STD KEY of REMOCON , check the conversion of the Screen
13) With S.STD KEY of REMOCON , check the conversion of the Sound
14) With SURROUND KEY of REMOCON, check the conversion of the Sound
15) Convert to STAND BY MODE.
16) Power off the JIG , and then disconnect JACK & CONNECTOR.
SERVICE MANUAL
3-4-2. Inspection item in VIDEO MODE
1. Required tool; : PM5518 ( PATTERN GENERATOR ) , VTR ( NTSC ) , SCOPE , JIG1 ,
2. Preliminary item : 1) set up PM5518 : RF FREQ' :55.25MHZ , PATTERN : COLOR BAR ,
SOUND : STEREO ( 3KHZ/1KHZ ) SYSTEM : PAL/NTSC - 6 ( REAR PANEL ) RF GAIN : 60dBuV
3. Insepction procedure :
1) Inserting Connector
2) Power on JIG , and then POWER ON the set. ( Check the color of LED : GREEN )
3) Inserting RCA-JACK BLOCK S-VHS JACK & PC AUDIO JACK.
4) After converting to VIDEO MODE , check the screen & Sound .
5) In the screen of SCOPE check that the output is L : 3KHZ , R : 1KHZ
6) With S.MODE KEY of Remote control , after converting to MONO , check the SOUND ( L /R :3KHZ )
7) After converting to S-VIDEO MODE , check the screen & SOUND
8) After converting PC MODE, check the output of PC AUDIO
9) After inserting SCART CABLE
10) After converting to STAND BY MODE, check the color of LED ( LED color : RED )
11) Power off JIG , and then disconnect JACK & CONNECTOR
SERVICE MANUAL
3-4-3. Inspection in PC MODE
1. Inspection item : in each MODE setting PC , inspect the status
2. Preliminary item : 1) MSPG-925L Setting
- Pattern : Select 1DOT W/BLACK ( PATTERN NO : 28 , MODEL NO.: 21 )
3. Inspection procedure:
1) Afrer inserting 15pin JACK and DC-JACK, POWER ON
2) 2) Select PC MODE.
3) After converting MODEL NO of MSPG-925L to 21 ( 1024 x 768 @85Hz ) , check the screen status
4) After converting MODEL NO of MSPG-925L to 15 ( 800 x 600 @ 85Hz ) , check the screen status
5) After converting MODEL NO of MSPG-925L to 10 ( 720 x 400 @ 70.1Hz ), check the screen status.
6) After converting MODEL NO of MSPG-925L to ( 640 x 480 @ 85Hz ) , check the screen status
7) After converting MODEL NO of MSPG-925L to 1 ( 640 x 350 @ 70.1Hz ) , check the screen status
8) With AUTO POSITION , set up the screen position
9) After converting MODEL NO of MSPG-925L to 28 ( 1024 x 768 @ 85Hz ) , In OSD MENU / FUNCTION / TRACKING , with AUTO TRACKING , set up the screen position
10) Disconnect DC-JACK , 15pin JACK
4. BLOCK DIAGRAM
TUNER
VPC3230
VIDEO
DECODER
SERVICE MANUAL
2M SRAM x2
MX88L284
FDS4435
FET SW
PANEL LINK
SIL140A
LCD CONNECTOR
74F14
AD9883
ADC & PLL
IMAGE SCALER
24C16
EEPROM
S3P863A
MICOM
78L05
REGULATOR
SERVICE MANUAL
FDS4435
FET SW
LM2596
REGULATOR
KA7808R
REGULATOR
MSP34X0G
AUDIO
PROCESSOR
RC1587M33
REGULATOR
TDA8542ATSSO
UND AMP
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