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NEC -FA150ATUA Service Manual

15-inch lcd monitor
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Service Manual
15-inch LCD Monitor
NEC-FA150ATUA

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Summary of Contents for NEC NEC-FA150ATUA

  • Page 1 Service Manual 15-inch LCD Monitor NEC-FA150ATUA...
  • Page 2 Service Manual Versions and Revision N o. Ve rs ion R e le as e D ate R e vis ion Copyright Trademarks...
  • Page 3 Table of Contents Circuit Description...
  • Page 4 NEC-FA150ATUA 1. Audio circuit (Circuit diagrams Main PWB) KT 2. Power supply (Circuit daigrams MAIN PWB) 7 . 1 7 . 1 S t a r t S t a r t : When power is turned on, Q801 conducts due to bias from C805 and R803. Q801 supplies a 17 volt : When power is turned on, Q801 conducts due to bias from C805 and R803.
  • Page 5 NEC-FA150ATUA 7 . 4 7 . 4 : If +5V goes up too much, the induced voltage on pin 4 of T802 becomes lar : If +5V goes up too much, the induced voltage on pin 4 of T802 becomes lar g e a l s o .
  • Page 6 NEC-FA150ATUA Item Outline Screen Composition 24 digits x 12 lines x 1 page Number of display characters Max. 288 characters Character composition 12 x 180 dots Kind of character 64 kinds Character size 4 (Ver. Direction) x 2 kind (Hor. Direction)
  • Page 7 NEC-FA150ATUA Input port: Display port: PICT clock rate conversion: Programmable picture processing: 6. System reset, LED control circuit (Circuit diagram MAIN PWB 4/6) Circuit Description...
  • Page 8 NEC-FA150ATUA Figure 6.1 Example reset circuit 3.3V 2.75V RESET RESET 0.8V Example when Vcc=3.3V Figure 6.2 RESET sequence 7. E PROM for PnP (Circuit diagram MAIN PWB) Circuit Description...
  • Page 9 NEC-FA150ATUA 8. E PROM (Circuit diagram MAIN PWB 4/6) 9. CPU circuit (Circuit diagram MAIN PWB 4/6) Circuit Description...
  • Page 10 NEC-FA150ATUA 37.5 Circuit Description...
  • Page 11 NEC-FA150ATUA Circuit Description...
  • Page 12 NEC-FA150ATUA Circuit Description...
  • Page 13 NEC-FA150ATUA uP POWER Panel_VCTL Panel_CLK BLON Panel Data Circuit Description...
  • Page 14 NEC-FA150ATUA uP Power Panel-VCTL Panel-CLK BLON Panel Data Circuit Description...
  • Page 15 NEC-FA150ATUA Circuit Description...
  • Page 16 NEC-FA150ATUA Circuit Description...
  • Page 17 NEC-FA150ATUA Circuit Description...
  • Page 18 NEC-FA150ATUA Inverter TAD617 BLOCK DIAGRAM ¡Ü ¡Ü ¡Ü ¡Ü ¡Ü ¡Ü ¡Ü ¡Ü ¡Ü ¡Ü Circuit Description...
  • Page 19 NEC-FA150ATUA l T h e l a m p c u r r e n t i s a c c u r r e n t , w e u s e i n t e g r a l c i r c u i t t o t r a n s f o r m a c v o l t a g e t o d c v o l t a g e , a n d t h e n i n p u t t o...

  • Page 20: Functional Block Diagram

    NEC-FA150ATUA T h e l o a d i n g o f l a m p b e f o r e l i g h t i n g u p = œ , t h e l o a d i n g a f t e r l i g h t i n g...

  • Page 21: Usb Circuit

    NEC-FA150ATUA 11. USB circuit Circuit Description...
  • Page 22 NEC-FA150ATUA Table of Contents Trouble Shooting...

  • Page 23: No Display Of Screen (Screen Is Black, Color Of Led Is Amber)

    NEC-FA150ATUA 1. No display of screen (Screen is black, color of LED is amber) Does OSM display when you push NEXT button. When a signal isn't being inputted, it is indicated with "VIDEO INPUT". It is indicated Preceed "No OSM display"section.

  • Page 24: Nothing Displays On Screen (Screen Is Black, Color Of Led Is Green)

    NEC-FA150ATUA 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 25 NEC-FA150ATUA Continue Check the 3.3 V power are supplied on I312 pin 2. Check if the voltage on I312 pin3 that is high level DC at 5V. Failure point 1) Printed wire broke between I312 and FB314 2) Power Board failure.
  • Page 26 NEC-FA150ATUA Continue Check the data enable of positive polarity are output on P301 pin 37. Failure point 1) I305 failure. 2) Printed wire broke between I305 and P301 pin 37. Check the data signal output on P301 R, G, B data pin.

  • Page 27: Checking The Back Light Unit

    NEC-FA150ATUA 3. Checking the back light unit Is +12V supplied to P803 pin 3, 4 to inverter P W B ? Failure point Inverter cable disconnection. Check the BLON signal of the rectangle input I307 pin 5 at TTL high level Is a "H"...

  • Page 28: Abnormal Screen

    NEC-FA150ATUA 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 29: No Osm Display

    NEC-FA150ATUA 5. No OSM display Check the input of pulse from I306 pin 33,34, 35, 36, 37 Failure point 1) Printed wire broke between I306 pin 33 and I305 pin 93. 2) Printed wire broke between I306 pin 34 and I305 pin 88.

  • Page 30: Abnormal Auto Adjustment

    NEC-FA150ATUA 6. Abnormal auto adjustment Check the input of 3.3Vp-p pulse from I305 pin 88, 89, 93, 94, 95. Failure point 1) Printed wire broke between I305 pin 88 and I306 pin 34. 2) Printed wire broke between I305 pin 89 and I306 pin 37.

  • Page 31: Abnormal Plug And Play Operation

    NEC-FA150ATUA 7. Abnormal plug and play operation ( Abnormal DDC2 "Read" Confirm the output of serial data on I304 pin 5 SDA at TTL level. Failure point I304 failure. Failure point 1) The host machine isn't communicating in DDC2 mode.
  • Page 32 NEC-FA150ATUA 8. Checking the interface circuit of sync signal 8.1 Checking the control circuit of horizontal sync pulse Check the horizontal sync signal on I306 pin 19 and I305 pin 127 (HS_ASIC at TTL level.) Process "Checking I302 pin 8 Output at TTL level Process "Checking I302 pin 13 Input at TTL level...

  • Page 33: Checking The Control Circuit Of Vertical Sync Pulse

    NEC-FA150ATUA 8.2 Checking the control circuit of Vertical sync pulse Check the vertical sync signal on I306 pin 17 and I305 pin 128 (VS_ASIC at TTL level.) Process "Checking I302 pin 4 Output at TTL level Process "Checking I302 pin 1 Input at TTL level Failure point 1) Video cable may have failed.

  • Page 34: Checking The Resolution Change Ic Movement

    NEC-FA150ATUA 9. Checking the resolution change IC movement Is there +3.3V supply on I302, I303, I305, I306, I308 Proceed "Checking the DC/DC converter circuit" section. Is 10MHz clock input to I306 pin 13 at TTL level? Is 10MHz clock output from X302...
  • Page 35 NEC-FA150ATUA 10. No power on 10.1 No power on (I) Check output voltage +5V, +12V is right or not. It is not power board problem. Check power switch is turn on or not. Turn switch on. Check power cord ( P801), Signal cable (P302),P802, P803 is connected right or not.
  • Page 36 NEC-FA150ATUA 10.2 No power on (II) Check the +5V power is supplied from power source Failure point Power source failure. Is LED turned on in amber momentarily when a power button is pushed? Failure point Power source failure. Proceed "Checking the operation of CPU".

  • Page 37: Checking The Dc/Dc Converter Circuit

    NEC-FA150ATUA 11. Checking the DC/DC converter circuit Checking the 5V is input from P306 pin 7 and pin 8. refer to section 10 "No Power On" Is the 5V input to I312 pin 3 Failure Point Printed wire or components broke between P306 pin 7,8 and I312 pin 3 Is the 3.3V output from I312 pin 2...

  • Page 38: Checking The Operation Of Cpu

    NEC-FA150ATUA 12. Checking the operation of CPU Is the +3.3V supply on CPU of I306 Failure point Printed wire broke between I306 and I312 output circuit Is 10MHz clock input to I306 pin 11 and 12 at TTL level Failure point X302 failure.

  • Page 39: Checking The Audio Circuit

    NEC-FA150ATUA 13. 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 40 NEC-FA150ATUA 14. Check the USB hub circuit 14.1 Hub isn’t recognize Is a cable with the host PC connected Failure point USB cable disconnection Is a USB cable connected with the monitor? Failure point USB cable disconnection Is a 5V supplied to I201 Pin1?
  • Page 41 NEC-FA150ATUA 14.2 Connection apparatus isn’t recongnize Is it aware of the USB hub in the host PC? Proceed section 15.1 "HUB isn't recognize" Is apparatus connected to the down stream port ? Failure point The un-connection of the down stream port cable.
  • Page 42 NEC-FA150ATUA 14.3 Connection apparatus doesn’t work Is it aware of the USB hub in the host PC ? Proceed section 14.1 "HUB isn't recognize". Is a host PC aware of the peripheral which doesn't work ? Proceed section 14.2 " Connection apparatus isn't recognize ".
  • Page 43 NEC-FA150ATUA 14.4 Check the USB IC Is 5V supplied to I201 pin 1 ? Proceed section 14.5 " Check the power supply ". Does it have the High level (More than 4.75V ) from I201 pin 9,10,12 Proceed section 14.5 " Check the power supply ".

  • Page 44: Check The Power Supply

    NEC-FA150ATUA 14.5 Check the power supply Is the 5V input to J201 pin 1, 2 Failure point 1) USB 5V short to ground 2) USB DC cable disconnection 3) Proceed 10 "No Power On (II)" Is the 5V input to Q203 (E) and I203...

  • Page 45: Recommended Parts List

    NEC-FA150ATUA 1. Recommended Parts List Location Part Number Description Ñ Ñ1 Ñ Recommended Spare Parts List...
  • Page 46 NEC-FA150ATUA Location Part Number Description Recommended Spare Parts List...
  • Page 47 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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