NEC NMV 1700V Manual de usuario

17-inch LCD Monitor

NMV 1700V (U170ATA)

Service Manual

CircuitDescriptionIndex

NMV1700V

1.Audiocircuit ----------------------------------------------------------------------------------------------------------------------------1

1.1Audioinput-------------------------------------------------------------------------------------------------------------------------1

1.2Audiooutput-----------------------------------------------------------------------------------------------------------------------1

2.Powersupply----------------------------------------------------------------------------------------------------------------------------1

3.Videoinputcircuit---------------------------------------------------------------------------------------------------------------------1

4.Definition converterLSIperipheralcircuit -------------------------------------------------------------------------------------1

5.Systemreset,LEDcontrolcircuit -------------------------------------------------------------------------------------------------1

6.E2PROMforPNP----------------------------------------------------------------------------------------------------------------------1

7.E2PROM----------------------------------------------------------------------------------------------------------------------------------2

8.CPUcircuit ------------------------------------------------------------------------------------------------------------------------------2

8.1Dection ofPOWERswitchstatus--------------------------------------------------------------------------------------------2

8.2Displaymodeidentification----------------------------------------------------------------------------------------------------2

8.3Usercontrol------------------------------------------------------------------------------------------------------------------------4

8.4Controlofidentification converterLSI(IC14)---------------------------------------------------------------------------5

8.5I2Cbuscontrol---------------------------------------------------------------------------------------------------------------------5

8.6PowerON sequence--------------------------------------------------------------------------------------------------------------6

8.7PowerOFF sequence ------------------------------------------------------------------------------------------------------------7

8.8ListofCPUassignments--------------------------------------------------------------------------------------------------------8

TableofContents

Page1CircuitDescription

NMV1700V

1. Audio circuit (Circuit diagramsMain PWB1/1 JACKPWB1/1)

1.1Audioinput

Theaudiosignalinputreceivedfromtheaudioinputterminal(JK011)isappliedtothepre-amplifierI006 of

2(L-CH)and 29 (R-CH)through thelow-pass filterconsisting ofR047,R049,R048,R050,C062 and C063.

Inthispre-amplifier,controlsofVolume,Balance,Bass,and Trebleareconducted.Theaudiosignalcontrolled

atthepre-amplifierisenteredinand amplifiedattheAMPI007of9(L-CH)and1(R-CH).Since then,thesignal

istotheoutputjack.

1.2Audiooutput

Theaudiosignalisoutputfromtheoutputterminal(P012)ofthejacktothespeakersystem.

2. Powersupply (Circuit daigramsMAINPWB8/10, 9/10, 10/10)

1.I322:DC-DCconverter

A5VpowersupplyforLCDmodule,CPU,and logicisgeneratedfromthe19Vsource.

2.I323:3-terminalregulator

A3.3VpowersupplyforScalerICI315,LVDSICI319,I320 isgeneratedfromthe5Vsource.

3.I330:3-terminalregulator

A3.3VpowersupplyforSDRAMICI316,I317,I318 isgeneratedfromthe5Vsource.

4.I324:3-terminalregulator

A2.5VpowersupplyforScalerICI315 isgeneratedfromthe5Vsource.

Q307,I321 ON/OFF controlforLCDModule

ON/OFF controlisperformedforpowerON/OFF and alsoforthepowersaving sequence.

3. Video inputcircuit (Circuit diagramMAINPWB4/10)

TheanalogvideosignalinputenteredfromP304,theAC-coupledvideosignalisusedtoclamptheblacklevelat

0V).

4. Definition converterLSIperipheralcircuit (Circuit diagramMAINPWB)

I315 gm5020 isthedefinition converterLSI.

Theanalog R,G,Bsignalinputenteredfromthevideoinputcircuit isconvertedintothedigitaldataofvideo

signalthrough theincorporatedA/Dconverter.Basedon thisconversion,thisdevice performsinterpolation

during pixelextension.Thesource voltageforthisdevice is3.3V,2.5Vand thesystemclockfrequencyis

24MHz.Thewithstand voltagelevelfortheinputsignalvoltageifI315 is3.3Vand 5V.

5. Systemreset, LEDcontrolcircuit (Circuit diagramMAINPWB3/10)

5.1Systemreset

Systemresetisperformedby detecting therisingand falling ofthe5Vsource voltageatI301.

5.2LEDcontrolcircuit

Green/amberislit withthecontrolsignaloftheLEDGREENand LEDAMBERsignalpin15,12 fromI306

(Circuit diagramMAINPWB2/8).

6. E2PROMforPnP(Circuit diagramMAINPWB4/10)

Page2Circ uitDescription

NMV1700V

7. E2PROM(Circuit diagramMAINPWB3/10)

DatatransferbetweenI305 (AT24 C16)and CPU(Circuit diagramMAINPWB2/8(I302)iseffectedthrough

theIICbusSCL(pin15)and SDA (pin16)ofI302.Thedatatobetransferredtoeachdevice arestoredinI305.

l I315controldata.

l OSDrelatedsetting data.

l Othercontroldataforservice menu.

8. CPUcircuit (Circuit diagramMAINPWB3/10)

I302 (87C51RD2)functionsastheCPU.

Thesource voltageforthedevice is5.0Vand thesystemclockfrequencyis24MHz.

8.1Detection ofPOWERswitchstatus

TheCPUidentifiestheONstatusofthetwopowersupplies.Theidentification ismadewhenthepowersupply

isturnedoff.Forexample,ifthepowersupplyisturnedoff withthePOWERswitch,thePOWERswitchmustbe

turnedon whenactivating thepowersupplyagain.If thepowersupplyisturnedoff by pulling outthepower

cord,thenthispowersupplycanbeturnedon by connecting thepowercord,withoutpressing thePOWER

switch.

8.2Displaymodeidentification

8.2.1Functions

(1)Displaymodeidentification

l Thedisplaymodeofinputsignalisidentifiedbasedon Table1.

l Whenthemodehasbeenidentifiedthrough themeasurementofhorizontaland verticalfrequencies,thetotal

numberoflinesisdeterminedwithaformulaof“Horizontalfrequency/Verticalfrequency=Totalnumber

oflines.“Finalidentification canbemadeby examining thecoincidence oftheobtainedfigurewiththe

numberoflinesforthemodeidentifiedfromthefrequency.Theboundarynumberoflinesineachmodeis

showninTable2.

l Whenthedetectedfrequencyifthesyncsignalhaschanged,thetotalnumberoflinesshouldbecountedeven

through it isrgeidentifiedfrequencyinthesamemode.

(2)Powersavemode.

Thispowersavemodeisassumedwhenthefrequencyofthehorizontal/verticalsignalisasspecifiedbelow.

l Verticalfrequency:50 ~86 Hz

l Horizontalfrequency:24 ~92 KHz

lVTOTAL:1200 ormore.

(3)Powersavemode.

Thepowersavemodeisassumedwhenthehorizontal/verticalsignalsareasspecifiedbelow.

l If thereisno horizontalsyncsignalinput.

l If thereisno verticalsyncsignalinput.

l If thehorizontalsyncsignalisoutsidethemeasuringrangeofgm5020.

Page3CircuitDescription

NMV1700V

l If theverticalsyncsignalisoutsidethemeasuringrangeofgm5020.

Polarity

Mode

Resolution

H-freq

(KHz)

Band Width

(MHz) H V

1. VGA 720 x 400 70Hz

31.47

28.322 -+

2. VGA 640 x 480 60Hz

31.47

25.175 - -

3. MAC 640 x 480 66Hz 35 32.24 - -

4. VESA 640 X 480 72Hz

37.86

31.5 - -

5. VESA 640 X 480 75Hz 37.5 31.5 - -

6. VESA 800 x 600 56Hz

35.16

36 + +

7. VESA 800 x 600 60Hz

37.88

40 + +

8. VESA 800 x 600 75Hz

46.88

49.5 + +

9. VESA 800 x 600 72Hz

48.08

50 + +

10. MAC 832 x 624 75Hz

49.72

57.283 - -

11. VESA 1024 x 768 60Hz

48.36

65 - -

12. VESA 1024 x 768 70Hz

56.48

75 - -

13. VESA 1024 x 768 75Hz

60.02

78.75 + +

14. VESA 1280 x 1024 60Hz 64 108 + +

15. VESA 1280 x 1024 75Hz 80 135 + +

16. VESA 1152 x 864 75Hz 67.5 108 + +

17. VESA 1280 x 960 60Hz 60 108 + +

Page4 CircuitDescription

NMV1700V

Table1

Table2thenumberofthelines,Vsyncdistinction

9.3UserControl

Indication resolution The number of the

distinction lines Distinction Vsync The fixed mode

640 x 480 487 < LINE <607 fV <63 Hz 2

63 Hz < fV <68 Hz 3

68 Hz < fV <74 Hz 4

74 Hz < fV <78 Hz 5

800 x 600 607 < LINE <777 fV <58 Hz 6

58 Hz < fV <63 Hz 7

63 Hz < fV <73 Hz 9

73 Hz < fV <78 Hz 8

832 x 624 640 <LINE -10

1024 x 768 768 < LINE <870 fV <63 Hz 11

68 Hz < fV <73 Hz 12

73 Hz < fV <78 Hz 13

1152 x 864 870 < LINE <1031 16

1280 x 960 960 < LINE <1027 17

1280 x 1024 1027 < LINE 14,15

9.3.2Functions

Controliseffectedforthepush-switchestobeusedwhentheuserchangestheparameters,inordertomodifythe

respectivesetting values.Whethertheswitchhasbeenpressedisidentifiedwiththeswitchinputlevelthatis

turned“L”.

Eachswitchinputportispulledup atoutsideofASIC

EachparameterisstoredintheEEPROM,thecontentsofwhichareupdatedasrequired.

Port Pin No.

I/O

Signal name

Function Remarks

GPI04

I315, M1

1MENU

EXIT/ENTER switch input

ENTER/Withdraw

from OSD

GPI05

I315, L1

1DOWN switch input ( ) key

GPI06

I315, G18

1-switch input ( ) key

GPI07

I315, G19

1+switch input ( ) key

GPI0

I302, 15

1 POWER soft power switch input ( power ) key

Page5CircuitDescription

NMV1700V

9.3.1RelatedportsofI315 and pinofI302

8.4.2Fun ction s

Majorfunction ofI315 areasfollows:

(1)Ex pansion ofthedisplayscreen.

(2)Timing controlforvarioussignaltypes.

Port Pin No. I/O Signal name Function

P3.5 17 IIICCLK IIC bus clock

P3.4 16 I/O IICDATA IIC bus data

(3)Power -supplysequence (LCDpanel).

8.5I2Cbuscontrol

8.5.1RelatedportsofI302

8.5.2I2C-control ledfun ctio ns

8.4Controlofdefinitio n converterLSII315

Pin No.

I/O

Signal name

Function

R3 IIRQ gmZan1 interrupt signal

P1 OHCLK gmZan1 serial clock

P3, P4,

R1, R2

I/O HDATA gmZan1 serial data

P2 OHFS gmZan1 serial select

8.4.1Portsrelatedtocontrol

Page6 CircuitDescription

NMV1700V

Thefollowing functionalcontrolsareeffectedby I2C.

(1)ControlofEEPROMI305fforparametersetting.

(2)Controlofaudiopreamplifier.

POWER

LED

LVCC

(Audio_EN)

Panel_VCC

PCLK/DATA

Backlight_EN

Page7CircuitDescription

NMV1700V

8.6PowerON sequence

WhenthePOWERswitchispressed,thePOWEROFFsignalisturned“H”.Whenthis“H”potentialisdetected,

theCPUbeginstoestablishtherespectivepowersuppliesaccording tothesequence shownbelow.

8.7PowerOFF sequence

WhenthePOWERswitchispressedwhilethepowersupplyisON,thePOWERONsignalisturned“H”.When

this“H”potentialisdetected,theCPUbeginstoturnoff therespectivepowersuppliesaccordingtothesequence

shownbelow.

POWER

LED

LVCC

(Audio_EN)

Panel_VCC

PCLK/DATA

Backlight_EN

Page 8 Circuit Description

NMV 1700V

Port Pin No. Signal Name Initial Setting Function Remark

~ NC ~ ~

P1.0 HDATA0 ~ gm50 0 4bit interface data

P1.1 !HDATA1 ~ gm50 0 4bit interface data

P1. "HDATA ~ gm50 0 4bit interface data

P1.3 #HDATA3 ~ gm50 0 4bit interface data

P1.4 $HCLK ~ gm50 0 4bit interface Clock

P1.5 %HFS ~ gm50 0 data enable

P1.6 &Bank ~ ~

P1.9 'PWM ~ Pulse width modulation

~ RST L Reset CPU Active H

P3.0  RXD H Receive data

~ NC ~ ~

P3.1 ! TXD H Transmit data

P3. " IRQ ~ gm50 0 interrupt signal

P3.3 # PWR_SW ~ ON/OFF monitor power

P3.4 $ SDA H IIC Bus Data

P3.5 % SCL ~ IIC Bus Data Active L

P3.6 & P3.6 H External Memor

Write Enable

P3.7 ' DDC_GND L Detect Dsub cable plug-in

~  XTAL ~ Crystal signal out

~  XTAL ~ Crystal signal in

~ GND ~ ~

~ ! NC ~ ~

P .0 " A8 ~ High-order address byte

P .1 # A9 ~ High-order address byte

P . $ A10 ~ High-order address byte

P .3 % A11 ~ High-order address byte

P .4 & A1 ~ High-order address byte

P .5 ' A13 ~ High-order address byte

P .6 ! A14 ~ High-order address byte

P .7 ! A15 ~ High-order address byte

~! PSEN# H Program store enable

~!! ALE ~ Address latch enable

~!" NC ~ ~

~!# EA# H External Access Enable

P0.7 !$ D7(USB_ON) H USB HUB

ower Enable

(

tion

)

P0.6 !% D6(MUTE) H Audio MUTE Enable

P0.5 !& D5(LVCC) L Audio suspend Enable

P0.4 !' D4(LEDGRN) H LED Green ON

P0.3 " D3

(

LEDAMBER

)

L LED AMBER ON

P0. " D (BKLT_EN) ~ Inverter Back light Enable

P0.1 " D1

(

LVDS ON

)

H LVDS IC Enable

P0.0 "! D0

(

PANEL EN

)

H Panel power Enable

~"" VCC ~ VCC

8.8 List of CPU Pin Assignments

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