Quanta Computer L5TD Serial User manual

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UANTA COMPUTER INC.
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L5TD Serial Service Menu
Belinea 101551(111505)
July, 25, 2003 Revision: 1B
Issued By: T.H. Chu
Checked By: Benjie Tsao
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The release of this document is under controlled by the company. Any extra
copy of this document must be written permission by the product manager.
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- Quanta Confidential -

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L5TD Service Menu Rev 1B Page: 2
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HistoryPage
Reversion Date Remark
1A 7/17/2003 1
ST Released.
1B 7/25/2003 addpower&inverter ckt., updateV2PanelP/N

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Content
Chapter Page
A.WARNING 4
B. SAFETY PRECAUTIONS 5
1. DIMENSIONS 6
2. GENERAL INFORMATION 8
3. SPECIFICATIONS 9
4. THEORYOF OPERATION 14
5. DISASSEMBLY INSTRUCTIONS 17
6. CONTROL LOCATION 19
7. NECESSARY EQUIPMENT LIST 24
8. BLOCK DIAGRAM 25
9. CONDUCTORVIEW 26
10.SCHEMATICDIAGRAM 32
11.EXPLODED VIEW 38
12.TROUBLE SHOOTING HINTS 39
13.REPLACEMENT PARTS LIST 40
14.SPAREPARTS LIST 48
15.AUTO BALANCE 49

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WARNING
This service informationis designed for experiencedrepair technicians onlyandis not
designedfor use bythe general public
It does not containwarnings or cautions toadvise non-technical individualsof
potential dangersin attempting to servicea product.
Products powered byelectricityshould be serviced or repaired onlybyexperienced
professional technicians.
Anyattempt to service or repair the product or products dealt withinthisservice
informationbyanyone else couldresult in serious injuryor death.

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SAFETY PRECAUTIONS
1. CAUTION:
Nomodificationof anycircuit should be attempted. Service work should onlybe performed after you
are throughfamiliar withall of the following safetychecks andservicingguide lines.
2. SAFETYCHECK
Care should be takenwhile servicingthis LCD display. Because of the highvoltage used inthe inverter circuit.
These voltage are exposed insuch areas as the associatedtransformer circuits.
3. POWERSUPPLY REQUIREMENTS
The external power converter for this displayutilizes ACandDC cords, ACcord is detachable,
but DC cord is permanentlyattached. Any attempt toreplace anotheradaptercould result in serious
problemonthe display.
4. LEAKAGE CURRENT HOT CHECK
4-1 Plug the AC cord directlyintothe ACoutlet. Donot use anisolation transformer duringthis check.
4-2 Connect a 1500 ohm , 10watt resistor , paralleledbya 0.15uF capacitor betweeneach
metallic part and a good earth ground.
4-3 Use anACvoltmeter with1000ohm / volt ormore sensitivityand measure the ACvoltage
across the combination 1500 ohm resistor and0.15uF capacitor.
4-4 Move the resistor connectiontoeach exposedmetallic part and measure the voltage.
4-5 Reverse the polarityof the ACpluginthe AC outlet andrepeat the above measurement.
4-6 Voltage measured must not exceed1.5 volt RMS, fromanyexposedmetallic part to the ground.
Aleakage current testermaybe used in the above hot check, in whichcase anycircuit measured
must not exceed1 miliamp. In the case ofa measurement exceeding the 1miliamp value,
a reworkis requiredtoeliminate the chance ofa shock hazard.
ToMetal Parts
V
ACVOLTMETER
150010W
0.15u
.
Earth Ground

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1. DIMENSIONS (Unit:mm)
1.1 Front View(ID1)
1.2 Top View

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1.3 Rear View
1.4 Side View

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2. GENERAL INFORMATION
2.1. OUTLINE
This monitoris 15" multi-scan color LCD displaywiththe following features.
OSD ( on screendisplay) control allows easyuser adjustment.
Power savingfunction, which helps savingenergy , isalso one of the highlightsof this model.
2.2. FEATURES
2.2.1 Power Saving
Builtin PowerSavingfunction based on VESA-DMPS standard. Power energy shallbe saved
bycontrolling the circuit in accordance with power save signal fromcomputer.
2.2.2 OSD (on screen display) function
OSD (5 Languages ) function is excellent and new man-machine interface.
Anyoneis able to setup thepictureas helikethrough OSDmenu.
2.2.3 Self Test function
Self Testingpicturecomes outby pushingany key in the case of no-connection with computer
or power savingoperation. This function shows if monitor is alive or notand can beused for self
aging test.
2.2.4 Ergonomic design
Low emission design tomeetMPR II and TCO
2.2.5 Multi scan with digital technology
8bit micro controller controls the circuit operationto meetwith wide range signal of
Fh=31~61 kHz and Fv= 56~75Hz.So VGA640x400, VGA640x480, SVGA800x60,XGA 1024x768,
2.2.6 Factory preset
Theproduct has 21 memorymode in total . 12 modes arepreset and9modes are user definable.
2.2.7 Finedot pitch
LCD panelwith a fine dotpitch ( Horizontal :0.297 mm / Vertical: 0.297 mm)
2.2.8 Superior displayperformance
High contrast : 400 :1(Typical)
High brightness : 250 cd / m2(Typical)
Wide view angle :120 / 90 degrees (H/V)
2.2.9 Specialfunction
VESA DDC2B ( DisplayDataChannel) Compatible

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3. SPECIFICATION
3.1. Outline
3.1.1 FrontIndication: POWER SW, LED(Green/Amber),UP,Down,LEFT,RIGHT,Set/Auto and MENU
key are located onthefront panel.
3.1.2 Video signalcable connector, audio line-in receptacleand DC inletare locatedon the back side cabinet.
3.1.3 OSD menuincludesthe followingfunction. CONTRAST, BRIGHTNESS, H.POSITION, V.POSITION
COLOR-TEMPERATURE, CLOCK, PHASE, LANGUAGE, VOLUME, POWER-ON-RECALL
3.1.4 CONTRAST and BRIGHTNESS can bedirectlycontrolled with UP /Down key.
3.1.5 VOLUME can be controlled with LEFT /RIGHT key.
3.2. MECHANICAL SPECIFICATIONS
3.2.1 Dimension Height:371 mm( 14.7")
Width: 348mm (13.7")
Depth :157 mm ( 7.2")
3.2.2 NetWeight :5.6 kg ( 12.4 lbs)
3.2.3 Maximum ViewableArea:Diagonal 381mm(15")
3.3. PANEL SPECIFICATIONS
3.4. CONNECTORS
3.4.1 AC inlet: CEE22 typed connector
3.4.2 Audio :Line-in receptacle
J1
PHONEJACK STEREO
1
2
3
Part No. CLAA150XG08
Driver bit ofpanel 6 bit
Contrast ratio 400:1
Brightness 250 cd/ m2
Pixel pitch 0.297mm
Response time Typical 25 ms
Viewangle (L/R/T/B) 60/60/55/45degrees
Colorcoordinate white x=0.312,y=0.318

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3.4.3 Attached video signalcable connectorx1
3.5. ELECTRICALSPECIFICATIONS
3.5.1Standard conditions
3.5.2 POWER
3.5.2.1 Power supply
AC-DC adapter
Input voltage 90 - 264 V
Input current max. 1 Arms
Output voltage 12VDC, 350mA, 3.3V 2A
Frequencyrange 47 -63 Hz
Inrush current Shall be less than the ratingsof critical components
(including fuse, rectifiers and surge limiting device)
for all conditionsof line in voltage.
Maximum powerconsumption: 35 Watts
3.5.2.2 Power Management
The Power Management System compliesto TCO 03 standards.
MODE
H-SYNC V-SYNC COLOR OF
POWER LED
POWER CONSUMPTION RECOVERY TIME
OnActiveActiveGreen< 35 Watts-
Off Inactive Inactive Amber< 1Watts < 30 seconds
Remark: In case of no signal Power LED must be amber.
At first power on w/o signal LED will be green + message on screen.
Figure 3.4
Signal cable input connector.
Shell
1
2
3
4
5
10
12
11
6
13
14
15
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Signal Name
Blue video
Green video
Red video
Vsync (VCLK)
Ground
Hsync
Ground
N/C
Blue return
Green return
Red gr
ound
Ground
Ground
SDA (serial data)
SCL (serial clock)
Displayarea (HxV) 304x 228 mm
Videosignal level 0.7Vpp
Contrast Max.
Brightness Max.
Ambient Temperature 25 +/-5 C degrees
Input voltage AC220,50Hz
Warmingup time More than30 minutes
Displaymode 1024 x768

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3.5.3 Signalleveland inputimpedance
3.5.3.1 Video Signallevel
This LCD displayis adjusted at the factory using 0,7 Vp-p Video signal.
3.5.3.2 Sync Signal level
H/V Separate :TTLlevel
3.5.3.3 Inputimpedance
Video input : 75 ohms
Syncinput: > 1kohms
3.5.4DisplayArea
Displayarea : 304 x228 mm
3.5.5 Preset Timings
The product has21 memorymodesin total. 12 modes are presetand 9 modes
are user definable.
Timing
1 2 3 4 5 6 7 8 9 10 11 12
Standard
DOS VESA
VESA VESA
VESA
VESA VESA VESA VESA VESA Industry VESA
Data Pixel
640 640
640 640
720
800 800 800 800 1024 1024 1024
Data Line
350 480
480 480
400
600 600 600 600 768 768768
H-Freq
kHz 31.469
31.469 37.861 37.500
31.467
35.156 37.879 48.077 46.875 48.363 56.180 60.023
V-Freq Hz
70.087
59.942 72.809 75.000
70.082
56.250 60.317 72.188 75.000 60.004 69.960 75.029
Pix Rate
MHZ 25.175
25.175 31.500 31.500
28.320
36.000 40.000 50.000 49.500 65.000 74.160 78.750
Hor.A [us]
0.318
0.636* 0.508 0.508
0.616
0.667 1.000 1.120 0.323 0.369 0.323 0.203
Hor.B [us]
3.813
3.813 1.270 2.032
3.813
2.000 3.200 2.400 1.616 2.092 2.373 1.219
Hor.C [us]
1.907
1.907* 3.810 3.810
1.907
3.556 2.200 1.280 3.232 2.462 1.294 2.235
Hor.D [us]
25.422
25.422 20.317 20.317
25.442
22.222 20.000 16.000 16.162 15.754 13.810 13.003
Hor.E [us]
31.778
31.778 26.413 26.667
31.778
28.444 26.400 20.800 21.333 20.677 17.800 16.660
Vert.A
[ms] 0.191
0.381 0.026 0.027
0.382
0.028 0.026 0.770 0.021 0.062 0.018 0.017
Vert.B
[ms] 0.064
0.064 0.079 0.080
0.064
0.057 0.106 0.125 0.064 0.124 0.142 0.050
Vert.C
[ms] 1.907
1.048# 0.528 0.427
1.111
0.626 0.026 0.478 0.448 0.600 0.463 0.466
Vert.D
[ms] 11.122
15.253 12.678 12.800
12.711
17.067 15.840 12.480 12.800 15.880 13.670 12.795
Vert.E
[ms] 14.268
16.683 13.735 13.333
14.268
17.778 16.579 13.853 13.333 16.666 14.293 13.328
Sync.Pol.
+/- - / - - / - - / - -/+ + / +
+ / + + / + + / + - /- + / + + / +
Note:
*Indicates horizontal front/ back porch includes borders
# Indicatesvertical front / back porch includes borders

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3.5.6 Generalperformance
3.5.6.1 Maximum pixel clock
78.85 MHz
3.5.6.2 Maximum luminance
Test conditions: 100% all whitepattern, brightness setto Maximum
typical: 250 cd/m2
min : 200cd/m2
3.5.6.3 Brightness variation
3.5.6.4 Contrastratio (CR)
3.6. ENVIRONMENTS
The environmental conditionsare in accordance to IEC 721
Operating:
Temperature: 5°C -+40°C
Humidity:20%- 80%
Height: 3000 m
Air pressure:
700 - 1060 mbar
Storage (unpacked)
Temperature: -20°C - +60°C
Humidity:10%- 85%
Height: 3000 m
Air pressure: 700 -1060 mbar
Transport (packed)
Temperature: -30°C - +60°C
Humidity:5% -95%
Height: 12000 m
Value CR=B/ A
Conditions Contrast : Maximum
Brightness : max
B: Full white pattern
A: Full black pattern
Value 75 % Variation (C/ A x100)
Conditions Displayimage: Full white
Brightness : Maximum
Contrast : Maximum
A: Luminance at center position
C: Luminance at position oflowest
brightness

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3.7. REGULATORY STANDARDS
3.7.1 Safety standards
This monitor applies tovarious safety& EMI standards May refer to thelogo label
3.7.2 EMC standards
FCC part 15,subpart B , class-B (EMV) CE marking
3.8. OTHERS
TCO03,
3.9. P0WER CORD
Northern Hemisphere Version : UL/CSA approved powercord.
European:VDE approved power cord.
3.10. SIGNAL CABLE
Signal cable with MiniD-Sub 15P connectors.Length : 1.8 meter.
3.11. RELIABILITY
> 30000hrs (demonstrated MTBF)

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4. THEORY OF OPERATION
This section describes the function ofthe LCD monitor per functional block.
L5EPmonitorincludes MBboard(including audio boardfunction inside), inverter board, adapter andbutton board.
4.1 MB BOARD
The MB boardis a four-layer, single-landed designwithgroundand internal planes provided. DCpower
fromthe power adapter enterthe boardthrough DC jack. Other connectors onthe board are forinverter,
andbutton board.The VGA cable is a signal cable that contains videosignal, sync signal andDDC
signal fromPC VGAadapter.
The systemboardconsists of3functional areas : flat panel controller, micro-controller, power regulator
4.1.1 Flat panelcontroller MST8016 (U2)
The heart of the systemboardis MST8016. The MST8016is a graphics processing IC forLCD monitor.
It providesallkeyICfunctionsrequiredforLCDpanel.On-chipfunctionsincludea high-speed
triple-ADC,PLL,highscalingengine,andOSDcontroller.
a) ClockGeneration :
Crystal Input Clock (TCLK and XTAL). This is the input pair to aninternal crystal oscillatorand
correspondinglogic.A14.318MHzcrystalisrecommended.
b)Hardware Reset ( Pin 155 )
Hardware Reset signal is generatedbymicro-controller(U4, pin 36).It assert a reset signal at least 100ms.
c) Analogto Digital Converter
The MST8016chiphas three ADC's (analog-to-digital converters), one foreachcolor(red, green and blue)
The analog RGB signals are connected to MST8016 as described below
d)Panel Power Sequencing( VDDCTRL, INVCTRL) ( Pin20~21)
The MCU has two dedicatedoutputs VDDCTRL1, 2 andINVCTRL (Pin9, 16and Pin36)to control LCD power
sequencingoncedataandcontrolsignalsarestable.
e) Panel interface (Pin 66~137)
The MST8016driver interface is highlyprogrammable. It supports dual bus / dual port for XGAdrivers.
Pin Name PinNumber
Red+ 59
Red - 60
Green+ 53
Green- 54
Blue + 47
Blue - 48

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4.1.2 Microcontroller MT312 (U4)
The MT312is a microcontrollerserves as the systemmicrocontroller.That is , it programs the
MST8016andmanages otherdevices in the systemsuch as the keypad, the backlight, LED, audioand
non-volatile RAM.using general purpose input/output (I/O)pins.
PinNo PinName Pin Usage
20 P1.2(SDA) Data signal forserial communication
21 P1.3 (SCL) Clocksignal for serial communication
26 P6.1 (PWR KEY) ForOn/Offpowerbutton
19 P3.2 (INT) ConnecttoMST8016
9, 16 P6.3, P6.2
(
VDDCTRL
)
ForPanelpowercontrol
36 P4.0 (INVCTRL) For inverteron/off control
37 P4.1 (MUTE) Control audiovolume to mute
41 P5.4(LED Green) Control LED green
42 P5.3 (LED Red) Control LED red
25 P1.7(DSUB_5V) For VGAsignal check
27 P6.0 ( KEY in) Control buttoninput
28 P3.1 (VGASDA) EDID data connect toVGA port
29 P3.5( VGASCL) EDID clockconnect to VGAport
22 P1.4 (Reset) Provide Reset signal for MST8016

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4.1.3 Power reference AIC1739 (Q3)
TheAIC1739is a2.5V voltage provider. It could support maximum100mAcurrentcapability.The2.5V reference was for
scaler MST8016reference. The voltage was veryimportant for this all the functionthat MVZ have.
4.2 Inverter/Power/Audio Board
This is a specific inverter/Power/Audiomodule forL5TD monitor withbacklight/EE parts/audio function.
4.2.1 Inverter function
The inverter converters 12 Vdc to drive twocold cathode fluorescence tubes. Electrical specification described as below.
4.2.2 Adapter
This is a general purpose AC / DCadapter which converter 90~240 Vac toa stabilizedDC voltage 12V
withrated outputcurrentof3A.Electricalspecificationdescribedasbelow
4.2.3 Audio amplifier TDA7496
TheTDA7496on the power boardis a 2channel audiopower amplifiercapable ofdelivering1W of continuous average power
to an8ohmswithlessthan 10%(THD)froma12 V powersupply.
TDA7496candirectlydrive 8ohms speaker , does not require output coupling capacitor, bootstrapcapacitor
,orsnubbernetwork. Audio line-in are feedintopin4,8ofthe AN7522. The output power is controlled by
the DC voltage of pin 39fromMTV312I/ O port.
INPUT RatedInput Voltage 12Vdc (L5EP)
MaximumInput Voltage 11.4~12.6Vdc
Input Current <1. 2A
Off state Input Power < 0.1W
On/ Off Voltage 20~98 % dutycycle
OUTPUT
RatedOutput Strike-on Voltage 1100 Vrms
RatedOutput Voltage 675Vrms at 7.5 mA
RatedOutput Frequency 50~60KHz
Rate Output Current per tube 7.5mA
INPUT Rated Input Voltage 100~240Vac , 50/60 Hz
Operation Input Voltage 90~264 Vac, 47~63Hz
Input Current < 1.0A
InrushCurrent (Cold Start) < 50A@all input range
StandbyInput Power < 1.0 W (3.3V 30mA)
OUTPUT
Rated Output Voltage 12Vdc and3.3Vdc
Output Voltage Regulation + 5 / -5% and
Output Ripple and Noise < 120and100mVp-p
Rate Output Current < 250mA and 2.0A
Turn-onDelay < 1 Second

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5. DISASSEMBLY INSTRUCTIONS
1.Stand and & rear cover removal
1)remove four large screw"1"from
the rearcover
2)remove the backcover
2.Bezel removal
1)remove screw"1" & 2”from
the Bezel
2)remove the bezel

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3. Inverter cover & Inverter board removal
1)remove twoscrew"1", 2”& 3”
2)remove the shield cover
3)remove twoscrew"4"
4)remove cable 4& 5 thenremove
Power/Inv board
4. AD board removal
1)remove cables 1, 4& 5
2)remove screw 2”& 3”
3)remove the AD board

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6. CONTROL LOCATION
1 OSDMenu TriggerOSDMainMenu/ClearOSD
2 UP 1.SelectOSDMain MenuItem
2.TriggerBrightness/ContrastMenu.
3 DOWN 1.SelectOSDMain MenuItem
2.TriggerBrightness/ContrastMenu.
4 POWER SwitchPowerON/OFF
5 LEFT 1.DecreaseMenuItemvalue
2.TriggerVolume Menu.
6 RIGHT 1.IncreaseMenuItemvalue
2.TriggerVolume Menu.
7
SELECT/ AUTO
1.SwitchOSDMain Menufocusstatus.
2.PerformAutoconfiguration.
Color Status Description
Green Normalstatus
Amber EnterSleepModestatusoruse Power+Auto”
keyenter
factorymode
LED Status
Button Define

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lOSDMainMenu
lBrightness/ContrastMenu
lVolume Menu
lAutoConfiguration
Dialog Overview
Whenuserpressthe Up or Down keys
undernoneOSDstatuswilltriggerthis
menuappearforBrightnessand
Contrast adjust.Thismenuwill
display about45seconds.
Whenuserpressthe Menu
keyundernone
OSDstatuswilltriggerthismenu
appearfordetailparametersadjust.
Thismenuwilldisplayabout45seconds
ifnoonepressotherkey,otherwise
willrefreshdisplaytimelength.
Whenuserpressthe Left or Right
keysundernoneOSDstatuswill
triggerthism
enuappearforVolume
adjust. Usethe Left &Right keys
adjustthevolumevalue,andusethe
Up &Down keysswitchtheMute
status.Thismenuwilldisplayabout
45seconds.
Whenuserpressthe select/Auto
key
undernoneOSDstatuswilltrigger
thisdialogappearandperformAuto
Configurationprocedure.