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NEC NMV 1700V, Руководство по обслуживанию

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NEC NMV 1700V Скачать руководство пользователя страница 16

Trouble Shooting

Page 5

 NMV 1700V

3. Checking the back light unit

Is +19V supplied to F301 pin 1.

OK

NG

OK

NG

Failure point

An AC adapter is changed to the normal goods.

Is +19V supplied to P308 pin 3, 4 to inverter

PWB?

OK

NG

Are connected AC adapters normal goods?

Failure point

Inverter cable disconnection.

Failure point

Printed wire broke between

P312 pin 1.

Check the BKLT_EN signal of the rectangle input I327 pin 3 at TTL high level

OK

NG

Is a "H" level being output in the TTL level from I306 pin 14

Or, is BKLT_EN signal of the rectangle being output?

NG

Failure point

Printed wire broke between

I306 pin 14 and I327 pin 3.

Check the PWM signal of the input from I315 pin M4 (R374 pin 2) is a PWM signal.

OK

NG

Failure point

1) Printed wire broke between

    I315 pin M4 and R374 pin 2.

2) I315 failure.

Failure point

1) Inverter cable disconnection.

2) Inverter of LCD module failure.

Содержание NMV 1700V

Страница 1: ...17 inch LCD Monitor NMV 1700V U170ATA Service Manual ...

Страница 2: ...ipheral circuit 1 5 System reset LED control circuit 1 6 E2 PROM for PNP 1 7 E2 PROM 2 8 CPU circuit 2 8 1 Dection of POWER switch status 2 8 2 Display mode identification 2 8 3 User control 4 8 4 Control of identification converter LSI IC 14 5 8 5 I2 C bus control 5 8 6 Power ON sequence 6 8 7 Power OFF sequence 7 8 8 List of CPU assignments 8 Table ofContents ...

Страница 3: ...lator A 2 5V power supply for Scaler IC I315 is generated from the 5V source Q307 I321 ON OFF control for LCD Module ON OFF control is performed for power ON OFF and also for the power saving sequence 3 Video input circuit Circuit diagram MAIN PWB 4 10 The analog video signalinput entered fromP304 the AC coupled videosignal isused to clamp the black level at 0V 4 Definition converter LSI periphera...

Страница 4: ...modeidentification 8 2 1 Functions 1 Display mode identification l The display modeof input signal is identified based on Table 1 l When the mode has been identified through the measurement ofhorizontal and vertical frequencies the total number of lines is determined with a formula of Horizontal frequency Vertical frequency Total number of lines Final identification can be made by examining the co...

Страница 5: ... 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 V...

Страница 6: ... 960 LINE 1027 17 1280 x 1024 1027 LINE 14 15 9 3 2 Functions Control iseffected for the push switchesto be used when the userchanges the parameters in order tomodify the respective setting values Whether the switch has been pressed is identified with the switch input level that is turned L Each switch input port is pulled up at outside of ASIC Each parameter is stored in the EEPROM the contents o...

Страница 7: ...F u n c t i o n P3 5 1 7 I I I C C L K I I C b u s c l o c k P3 4 1 6 I O IICDATA IIC bus data 3 Po wer su pply se que nce LC D p anel 8 5 I2 C bus c ontrol 8 5 1 Related ports of I302 8 5 2 I2 C cont rol led fun ctio ns 8 4 Cont rol of d efinitio n conver ter LSI I315 Pin No I O Signal name Function R3 I IRQ gmZan1 interrupt signal P1 O HCLK gmZan1 serial clock P3 P4 R1 R2 I O HDATA gmZan1 serial...

Страница 8: ...t Description NMV 1700V The following functional controlsare effected by I2 C 1 Control of EEPROM I305f for parameter setting 2 Control of audio preamplifier POWER LED LVCC Audio_EN Panel_VCC PCLK DATA Backlight_EN ...

Страница 9: ... establish the respective power supplies according to the sequence shown below 8 7 Power OFF sequence When the POWER switch ispressed while the power supply is ON the POWER ONsignal is turned H When this H potential isdetected the CPUbegins to turn off therespective power suppliesaccording to the sequence shown below POWER LED LVCC Audio_EN Panel_VCC PCLK DATA Backlight_EN ...

Страница 10: ...y Write Enable P3 7 DDC_GND L Detect Dsub cable plug in XTAL2 Crystal signal out XTAL Crystal signal in GND NC P2 0 A8 High order address byte P2 1 A9 High order address byte P2 2 A10 High order address byte P2 3 A11 High order address byte P2 4 A12 High order address byte P2 5 A13 High order address byte P2 6 A14 High order address byte P2 7 A15 High order address byte PSEN H Program store enable...

Страница 11: ...SM display 8 5 2 OSD Adjust problem 8 6 Abnormal plug and play operation 9 6 1 Abnormal DDC2 9 7 Checking the interface circuit ofsync signal 10 7 1 Checking the control circuit of horizontal sync pulse 10 7 2 Checking the control circuit ofvertical sync pulse 10 8 Checking the resolution change IC movement 11 9 No power on 12 10 Checking the DC DC converter circuit 13 11 Checking the operation of...

Страница 12: ...omputer is output and if the video cable is connected normally No Preceed No OSM display section OK Proceed Checking the resolution change IC movement section NG Input the sync signal of computer or change the cable When a signal isn t being inputted it is indicated with VIDEO INPUT It is indicated with OUT OF RANGE at the time of the frequency that it can t be distinguished ...

Страница 13: ...s displayed on screen when you push the PROCEED key NG 1 Change pattern of video signal output on the host 2 Reconnect the video cable 3 Change the video cable Check the video cable for failure Check the host for output signal with all black only OK NG Proceed Abnormal screen section Check if the LCD video signal cable is connected between the MAIN PWB and LCD module OK NG Next Page Failure Point ...

Страница 14: ...clock being outputted under the condition that a LCD module is connected to L322 pin 2 OK NG Failure point 1 I315 failure 2 Printed wire broke between I315 and L322 pin 2 Check the H sync pulse of negative polarity is output on RN314 pin 8 at TTL level OK NG Failure point 1 I315 failure 2 Printed wire broke between I315 and RN314 pin 8 Check the V sync of negative polarity are output on RN314 pin ...

Страница 15: ...re 2 Printed wire broke between I315 and RN314 pin 6 Check the data signal output on I315 R G B data pin OK NG Failure point 1 I315 failure Failure point 1 The cable broke between P304 and LCD module 2 LCD module failure Check I319 I320 all LVDS signal pins OK NG Failure point 1 I319 I320 failure 2 Printed wire broke between I319 I320 and P307 ...

Страница 16: ...ke between P312 pin 1 Check the BKLT_EN signal of the rectangle input I327 pin 3 at TTL high level OK NG Is a H level being output in the TTL level from I306 pin 14 Or is BKLT_EN signal of the rectangle being output NG Failure point Printed wire broke between I306 pin 14 and I327 pin 3 Check the PWM signal of the input from I315 pin M4 R374 pin 2 is a PWM signal OK NG Failure point 1 Printed wire ...

Страница 17: ...ke between I315 data line and I319 I320 2 I315 failure Check the negative horizontal sync pulse output to RN314 pin 8 from I315 pin F20 at TTL level OK NG Failure point 1 Printed wire broke between I315 pin F20 and RN314 pin 8 2 I315 failure Check the negative vertical sync pulse output to RN314 pin 7 from I315 pin F19 at TTL level OK NG Check the positive DE pulse output to RN314 pin 6 from I315 ...

Страница 18: ...rinted wire broken between I319 I320 and P307 OK NG Failure point 1 R396 open 2 Printed wire broken between I318 I316 I317 pin 35 and I315 pin T3 3 I315 failure Check all Data Address pins signal between I315 and I316 I317 I318 OK NG Failure point 1 Printed wire broke between I318 I316 I317 and I315 2 I315 failure 3 I318 I316 I317 failure Process Checking the resolution change IC movement section ...

Страница 19: ...5 pin P1 and I302 pin 6 7 RN301 RN303 open short Proceed Checking the resolution change IC movement section 5 1 NO OSM display 5 2 OSD Adjust problem OK NG Check the input TTL level whether was changed when pressed function keys Failure point 1 Printed wire broke between P302 pin 3 and I302 pin 15 2 Printed wire broke between P302 pin 4 and I315 pin G19 3 Printed wire broke between P302 pin 5 and ...

Страница 20: ...6 synchronize SCLK at TTL level OK NG Failure point I310 I312 failure Failure point 1 The host machine isn t communicating in DDC2 mode 2 The video cable may have failed or may not to have connections for DDC 3 Between I312 pin 6 and P304 pin 15 may have failed 4 Between I310 pin 6 and P303 pin 6 may have failed 5 R335 R326 open 6 Cable failure ...

Страница 21: ...d wire broke between P304 pin 13 and I315 pin L2 3 FB305 R329 open 4 R330 C352 short Process Checking the resolution change IC movement section Check the vertical sync signal on I315 pin K1 TTL level OK NG Failure point 1 Video cable may have failed 2 Printed wire broke between P304 pin 14 and I315 pin K1 3 FB328 FB304 open 4 R331 C353 short Process Checking the resolution change IC movement secti...

Страница 22: ...nt Print wire broke between X303 pin 5 and I315 pin J4 OK NG Failure point Print wire broke between and X303 pin 8 and power supply Failure point X303 failure Is 5 0V supplied to I315 pin T1 at High level Reset signal OK NG Check the output of 5 0V H pulse from I301 pin 6 OK NG Is 5 0V supplied to I301 pin 7 Failure point I315 failure Failure point Print wire broke between I301 pin 6 and I315 pin ...

Страница 23: ... No power on Check the 19V power is supplied from AC adapter OK NG Failure point AC adapter failure Is LED turned on in amber momentarily when a power button is pushed OK NG Failure point Fuse failure Proceed Checking the operation of CPU ...

Страница 24: ...utput of 3 3V line voltage from I323 pin 2 Printed wire broke between I322 pin 1 and L314 pin 2 OK NG Is the output FB335 being inputted to I315 pin 3 OK NG Failure point Printed wire broke between I323 pin 3 and output of FB335 Failure point I323 failure Failure point Printed wire broke between I323 pin 2 and IC 315 power supply pin ...

Страница 25: ...nted wire broke between output of FB331 and I302 power supply pin Is 24MHz clock input to I302 pin 20 and 21 at TTL level OK NG Failure point X301 failure Check the input of 5V H pulse from I302 pin 10 are same as I306 pin 1 OK NG Failure point 1 Printed wire broke between I302 pin 10 and I306 pin 1 2 I208 failure I302 failure ...

Страница 26: ...om JK011 pin 2 3 of the host PC OK NG Is the waveform which is the same as JK011 being inputted to I006 pin 2 29 Failure point Audio cable disconntction OK NG Failure point 1 Printed wire broke between JK011 pin 2 3 and I006 pin 2 29 2 R047 R048 open 3 R049 R050 short 4 C062 C063 open Is output wavefrom being outputted in I006 pin 9 22 OK NG a Is 9V supplied to I006 pin 10 OK NG Is 19V supplied to...

Страница 27: ...07 failure Is the output waveform of I007 pin 4 6 being inputted to P012 pin 2 3 OK NG Failure point 1 Speaker cable disconnection 2 Speaker failure b Is the H signal of the TTL level being inputted to I008 pin 1 OK NG Is the H signal of the TTL level being outputted from I306 pin 17 OK NG Proceed section 11 Checking the operation of CPU Failure point Printed wire broke between I306 pin 17 and I00...

Страница 28: ...01 6851105092 FUSE SLOW TR5 T CG90L 4 3 0 3 7 I301 6444006108 IC MOS M51953AFP 8P SOP 8 I302 6448015548 IC CPU PROM P87C51RD IA 44P PL 9 I304 6446006608 IC TTL 74HCT573DT 20P SMD PHIL 10 I305 6448016508 IC 24LC16B SN 8P SOP 11 I310 6448018208 IC 24LC02B 8PIN SOP MICROCHIP 12 I315 6444007608 IC CMOS gm5020 292P BGA GENESI 13 I316 6448018108 IC NT56V1616AOT 50P TSOP NANYA 14 I319 6444007708 IC CPU S...

Страница 29: ...000 5114600001 CONTROL BD U170ATUAV 99 27 D501 6418004401 LED LTL 36EDJP 1 Y 3 G LITEON 28 I006 6442027700 IC Linear BH3856S 30P SDIP ROH 29 I007 6442033000 IC TDA2616 9P SOT131 PHILIPS 30 I008 6442027600 IC Linear BA09ST 5P TO 220 ROH 31 L006 6111456131 COIL CHOKE uH 45 K DRWW10x10L 32 P C 0 2 6716009500 ADAPTOR POWER AC DC 19V 65W BL ...

Страница 30: ...LITE ON TECHNOLOGY CORP 5 F No 16 Sec 4 Nanking E Road Taipei Taiwan Tel 886 2 25706999 Fax 886 2 25706888 URL www liteontc com tw Printed in Taiwan ...

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