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NEC NMV 1700V Service Manual
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NEC NMV 1700V Service Manual

NEC NMV 1700V Service Manual

17-inch
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Service Manual
17-inch LCD Monitor
NMV 1700V (U170ATA)

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Summary of Contents for NEC NMV 1700V

  • Page 1 Service Manual 17-inch LCD Monitor NMV 1700V (U170ATA)

  • Page 2: Table Of Contents

    NMV 1700V Table of Contents Audio circuit ---------------------------------------------------------------------------------------------------------------------------- 1 1.1 Audio input ------------------------------------------------------------------------------------------------------------------------- 1 1.2 Audio output ----------------------------------------------------------------------------------------------------------------------- 1 Power supply ---------------------------------------------------------------------------------------------------------------------------- 1 Video input circuit --------------------------------------------------------------------------------------------------------------------- 1 Definition converter LSI peripheral circuit ------------------------------------------------------------------------------------- 1 System reset, LED control circuit ------------------------------------------------------------------------------------------------- 1...

  • Page 3: Audio Circuit

    N MV 1 7 0 0 V 1. Audio circuit (Circuit diagrams Main PWB 1/1 JACK PWB 1/1) Audio input The audio signal input recei ved from the audio input terminal (JK011) is applied t o the pre-amplifier I006 of 2 (L-CH) and 29 (R-CH) through the low-pass filter consisting of R047, R049, R048, R050, C062 and C063.

  • Page 4: E 2 Pr Om

    NMV 1700V 7. E PROM (Circuit diagram MAIN PWB 3/10) Data transfer between I305 (AT24 C16) and CPU (Circuit diagram MAIN PWB 2/8 (I30 2) is effected through the IIC bus SCL (pin 15) and SDA (pin 16) of I302. The data to be transferred to each device are stored in I305.
  • Page 5 NMV 1700V If the vertical sync signal is outside the measuring range of gm5020. Mode Resolution H -freq Band Width Polarity (KHz) (MHz) VGA 720 x 400 70Hz 31.47 28.322 VGA 640 x 480 60Hz 31.47 25.175 MAC 640 x 480 66Hz 32.24...

  • Page 6: User Control

    NMV 1700V Table 1 Table 2 the number of the lines, Vsync distinction Indication resolution The number of the Distinction Vsync The fixed mode distinction lines 640 x 480 487 < LINE < 607 fV < 63 Hz 63 Hz < fV < 68 Hz 68 Hz <...

  • Page 7: I 2 C Bus Control

    NMV 1700V 8 . 4 C ont rol of d efi ni t i o n co nv er t er LS I I31 5 8.4.1 Ports related to control Pin No. Signal name Function gmZan1 interrupt signal HCLK gmZan1 serial clock...
  • Page 8 NMV 1700V The following functional controls are effected by I (1) Control o f EEPROM I305f for parameter setting. (2) Control of audio preamplifier. POWER LVCC (Audio_EN) Panel_VCC PCLK/DATA Backlight_EN Circuit Description Page 6...

  • Page 9: Power On Sequ Ence

    NMV 1700V Power ON sequ ence When the POWER switch is pressed, the POWER OFF signal is turned “H”. When this “H” potential is detected, the CPU begins to establish the respective power supplies according to the sequence shown below.

  • Page 10: List Of Cpu Assignments

    NMV 1700V 8.8 List of CPU Pin Assignments Port Pin No. Signal Name Initial Setting Function Remark P1.0 HDATA0 gm5020 4bit interface data P1.1 HDATA1 gm5020 4bit interface data " P1.2 HDATA2 gm5020 4bit interface data P1.3 HDATA3 gm5020 4bit interface data P1.4...
  • Page 11 NMV 1700V Table of Contents No display of screen (Screen is black, color of LED is amber) ------------------------------------------------------------ 1 Nothing displays on screen (Screen is black, color of LED is green) ---------------------------------------------------- 2 Checking the back light unit -------------------------------------------------------------------------------------------------------- 5...

  • Page 12: No Display Of Screen (Screen Is Black, Color Of Led Is Amber)

    NMV 1700V 1. No display of screen (Screen is black, color of LED is amber) Does OSM display when you push PROCEED button. When a signal isn't being inputted, it is indicated with "VIDEO INPUT". It is indicated Preceed "No OSM display"section.

  • Page 13: Nothing Displays On Screen (Screen Is Black, Color Of Led Is Green)

    NMV 1700V 2. Nothing displays on screen (Screen is black, color of LED is green) Is backlight lit? Refer "Checking the backlight unit" section Check the video cable for failure. Check the host for Does computer output RGB video signals? output signal with all black only.
  • Page 14 NMV 1700V Continue Check the 3.3 V power are supplied on I323, I330 pin 2. Check if the voltage on I323, I330 pin 3 that is high level DC at 5V. Failure point 1) Printed wire broke between I322 and I323, I330 2) I322 failure.
  • Page 15 NMV 1700V Continue Check the data enable of positive polarity are output on RN314 pin 6. Failure point 1) I315 failure. 2) Printed wire broke between I315 and RN314 pin 6. Check the data signal output on I315 R, G, B data pin.

  • Page 16: Checking The Back Light Unit

    NMV 1700V 3. Checking the back light unit Is +19V supplied to F301 pin 1. Are connected AC adapters normal goods? Failure point An AC adapter is changed to the normal goods. Is +19V supplied to P308 pin 3, 4 to inverter...

  • Page 17: Abnormal Screen

    NMV 1700V 4. Abnormal screen Check the R, G, B video signal from computer input on D-Sub R, G, B connector. Failure point 1) No R, G and B video signal output from host computer. Check computer 2) Video signal cable disconnection.
  • Page 18 NMV 1700V Continue Check I319, I320 all LVDS signal pins. Failure point 1) I319, I320 faulure. 2) Printed wire broken between I319, I320 and P307. Check SDRAM IC clk signal output to I318, I316, I317, pin 35 from I315 pin T3.

  • Page 19: No Osm Display

    NMV 1700V 5. Abnormal OSM display 5.1 NO OSM display Check the input of 3.3Vp-p pulse from I315 pin P3, P4, R1, R2, P2, P1. Failure point 1) Printed wire broke between I315 pin P3 and I302 pin 5. 2) Printed wire broke between I315 pin P4 and I302 pin 4.

  • Page 20: Abnormal Plug And Play Operation

    NMV 1700V 6. Abnormal plug and play operation 6.1 Abnormal DDC2 Confirm the output of serial data on I312 pin 6, I310 pin 6 synchronize SCLK at TTL level. Failure point I310, I312 failure. Failure point 1) The host machine isn't communicating in DDC2 mode.

  • Page 21: Checking The Interface Circuit Of Sync Signal

    NMV 1700V 7. Checking the interface circuit of sync signal 7.1 Checking the control circuit of horizontal sync pulse Check the horizontal sync signal on I315 pin L2 TTL level. Failure point 1) Video cable may have failed. 2) Printed wire broke between P304 pin 13...

  • Page 22: Checking The Resolution Change Ic Movement

    NMV 1700V 8. Checking the resolution change IC movement Is there +3.3V supply on I315 pin D13, D15, D16, E17, G17, J17, L17, N17, R17, U17, U15, U13, U12, U10, U8, U6, U5, T4, L4, B2, B6, B7, B8, B9, B11, C3, D3, E3, F2, F4, G1, G3, H1, J1, J3.

  • Page 23: No Power On

    NMV 1700V 9. No power on Check the +19V power is supplied from AC adapter. Failure point AC adapter failure. Is LED turned on in amber momentarily when a power button is pushed? Failure point Fuse failure. Proceed "Checking the operation of CPU".

  • Page 24: Checking The Dc/Dc Converter Circuit

    NMV 1700V 10. Checking the DC/DC converter circuit Check if the 5V is output from I322 pin 2. Printed wire broke between I322 pin 1 and L314 pin 2. Check the output of 3.3V line voltage from I323 pin 2.

  • Page 25: Checking The Operation Of Cpu

    NMV 1700V 11. Checking the operation of CPU Is there +5.0V supply on I302 pin 44 Failure point Printed wire broke between output of FB331 and I302 power supply pin. Is 24MHz clock input to I302 pin 20 and 21 at TTL level? Failure point X301 failure.

  • Page 26: Checking The Audio Circuit

    NMV 1700V 12. Checking the audio circuit Is a cable with the host PC connected? Failure point Audio cable disconntction. Aren't the setups of the host PC a minimum and off? Failure point The setup of the host PC is changed.
  • Page 27 NMV 1700V Is the output waveform which is the Is the "H" signal of the TTL level same as I006 pin 9, 22 being being inputted to I008 pin 1? inputted to I007 pin 1,9? Failure point Is the "H" signal of the TTL level being outputted from I306 pin 17? 1) Printed wire broke between I006 pin 9, 22 and I007 pin 1, 9.

  • Page 28: Recommended Parts List

    U170ATA 1. Recommended Parts List Note: 1. The components identified by “ “ mark are critical for X-ray safety. Replace these with only the same parts specified. There is only OTP IC at the model beginning (FPR stage or before). When it put in mass production and there must be Mask coming out.

  • Page 29: Recommended Spare Parts List

    NM V 1 7 0 0 V N o . Location Part Number Description 0 0 0 0 51 13800002 F U N C T I O N K E Y B D U 1 7 0 A T U A V ( 9 9 ) 0 0 0 0 51 14600001 C O N T R O L B D U 1 7 0 A T U A V ( 9 9 )
  • Page 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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