NEC NEC-FA150ATUA Service Manual Download Page 27 | Manualshive

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Trouble Shooting

Page 5

NEC-FA150ATUA

3. Checking the back light unit

Is +12V supplied to P803 pin 3, 4 to inverter

P W B ?

O K

N G

Failure point

Inverter cable disconnection.

Check the BLON signal of the rectangle input I307 pin 5 at TTL high level

O K

N G

Is a "H" level being output in the TTL level from I306 pin 22

Or, is BLON signal of the rectangle being output?

N G

Failure point

Printed wire broke between

I306 pin 22

Check the Bright signal of the input from I306 pin 1 is a Bright signal.

O K

N G

Failure point

1) Printed wire broke between
I306 pin 1 and I307 pin 7.
2) I307 failure.

Failure point

1) Inverter cable disconnection.
2) Inverter of LCD module failure.

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Summary of Contents for NEC-FA150ATUA

Page 1: ...15 inch LCD Monitor NEC FA150ATUA Service Manual ...

Page 2: ...Corp NEC FA150ATUA Service Manual Printed in Taiwan Trademarks LiteOn is a registered trademark of LiteOn Technology Corp All other trademarks are the property of their respective owners No Version Release Date Revision 1 1 0 October 2 2001 Original release 2 1 1 October 11 2001 Circuit Description 9 3 page 7 Trouble Shooting 4 page 6 6 page 8 14 3 page 20 3 1 2 October 16 2001 Circuit Description...

Page 3: ... 6 System reset LED control circuit 4 7 E2 PROM for PNP 5 8 E2 PROM 6 9 CPU circuit 6 9 1 Dection of POWER switch status 6 9 2 Display mode identification 6 9 3 User control 8 9 4 Control of identification converter MCU I306 8 9 5 I2 C bus control 9 9 6 Power ON sequence 10 9 7 Power OFF sequence 11 9 8 List of CPU Pin Assignments 12 10 Inverter 15 11 USB circuit 18 Table of Contents ...

Page 4: ...e primary induc When Q803 turns on C805 suppli e s a linearly increasing triangle current through the primary induc When Q803 turns on C805 suppli e s a linearly increasing triangle current through the primary induc When Q803 turns on C805 suppli e s a linearly increasing triangle current through the primary induc t a n c e o f T 8 0 2 t o t h e d r i v e r Q 8 0 3 o n c e t h e p e a k v a l u e ...

Page 5: ... o n d u c t I f o u t p u t t e r m i n a l i s s h o r t t o g r o u n d p h o t o t r a n s i s t o r d o e s n o t c o n d u c t h e n c e Q 8 0 5 d o e s n o t c o n d u c t I f o u t p u t t e r m i n a l i s s h o r t t o g r o u n d p h o t o t r a n s i s t o r d o e s n o t c o n d u c t h e n c e Q 8 0 5 d o e s n o t c o n d u c t I f o u t p u t t e r m i n a l i s s h o r t t o g r o...

Page 6: ...Input for GREEN Channel BAIN Analog Input for BLUE Channel High impedance inputs that accept the RED GREEN and BLUE channel graphics signals respectively The three channels are identical and can be used for any colors but colors are assigned for convenient reference They accommodate input signals ranging from 0 5V to 1 0V full scale Signals should be ac coupled to these pins to support clamp opera...

Page 7: ... M66611 Color conversion with keeping white balance M66611 Color space expanding to 24 bit full color for 18 bit LCD panel 1024 extry gamma table for each R G B color M66611 6 System reset LED control circuit Circuit diagram MAIN PWB 4 6 6 1 System reset System reset is performed by detecting the rising and falling of the 3 3V source voltage at I309 There are two kinds of resets hardware and softw...

Page 8: ... sequence 7 E2 PROM for PnP Circuit diagram MAIN PWB Data transfer between I304 and host There are two forms of communications protocal In both display capabilities are retrieved by the system software during the boot up and configuration time For the PC platform this software layer is defined in the VESA BIOS Extension Display Data Channel VBE DDC standard ...

Page 9: ...isplay mode of input signal is identified based on Table 1 and according to the frequency and polarity HPOL VPOL of horizontal or vertical sync signal presence of the horizontal or vertical sync signal and the discrimination signal HSYNC_DETECT VSYNC_DETECT l When the mode has been identified through the measurement of horizontal and vertical frequencies the total number of lines is determined wit...

Page 10: ...00 56Hz 35 16 36 9 VESA 800 x 600 60Hz 37 88 40 10 VESA 800 x 600 75Hz 46 88 49 5 11 VESA 800 x 600 72Hz 48 08 50 12 MAC 832 x 624 75Hz 49 72 57 283 13 VESA 1024 x 768 60Hz 48 36 65 14 SUN 1024 x 768 65Hz 52 45 70 49 15 VESA 1024 x 768 70Hz 56 48 75 16 VESA 1024 x 768 75Hz 60 02 78 75 3 Out of range When resolution beyond 1024 x 768 is inputted resolution is lowered with Down scaling to 1024 x 768...

Page 11: ...d is identified with the switch input level that is turned L Each switch input port is pulled up at outside of MCU Each parameter is stored in the EEPROM the contents of which are updated as required 9 4 Control of definition converter MCU I306 9 4 1 Ports related to control Port Pin No I O Signal name Function Remarks P3 5 55 1 RESET Mute RESET switch input MUTE switch input The set value is retu...

Page 12: ...gnal types 3 Power supply sequence LCD panel 9 5 I2 C bus control 9 5 1 Related ports of I306 Port Pin No I O Signal name Function P0 6 80 I IICCLK IIC bus clock P0 5 81 I O IICDATA IIC bus data 9 5 2 I2 C controlled functions The following functional controls are effected by I2 C 1 Control of EEPROM I308f for parameter setting 2 Control of audio preamplifier ...

Page 13: ... sequence 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 uP POWER Panel_VCTL Panel_CLK BLON LED Panel Data ...

Page 14: ...n the POWER switch is pressed while the power supply is ON the POWER ON signal is turned H When tshown below his H potential is detected the CPU begins to turn off the respective power supplies according to the sequence uP Power Panel VCTL Panel CLK LED BLON Panel Data ...

Page 15: ...ck ActiveL 11 Xout uPClockOutput 12 Vss GND 13 Xin uPClockInput 14 Vcc uP_Vcc3 3V P8 5 15 NMI uPInterrupt generator WhenHi toLow P8 4 16 Nc P8 3 17 V1_Detect VS_ASIC P8 2 18 Nc P8 1 19 H1_Detect HS_ASIC P8 0 20 NC P7 7 21 DE_Detect DDC_GND P7 6 22 BLON H Inverter EnableControl P7 5 23 Nc P7 4 24 Nc P7 3 25 Nc P7 2 26 Nc P7 1 27 DDC_SCL uP_DDC_SCL P7 0 28 DDC_SDA uP_DDC_SDA P6 7 29 TXD ISPTXD P6 6 ...

Page 16: ...uspandFunction ActiveH P4 1 51 Wprt_0 L Serial EEPROMWriteProtection ActiveH P4 0 52 Mute L AudioMuteFunction ActiveH P3 7 53 Proceed H uP_Proceed ActiveL P3 6 54 Right H uP_Right ActiveL P3 5 55 Reset_46 H uP_Reset_46 ActiveL P3 4 56 Down H uP Down ActiveL P3 3 57 UP H uP_UP ActiveL P3 2 58 Left H uP_Left ActiveL P3 1 59 Exit H uP_Exit ActiveL 60 Vcc H uP_Vcc3 3V ActiveL P3 0 61 Power H uP_Power ...

Page 17: ...9 Nc P0 6 80 IIC_SCL uP_SCL P0 5 81 IIC_SDA uP_SDA P0 4 82 Nc P0 3 83 Nc P0 2 84 Nc P0 1 85 Nc P0 0 86 Nc P10 7 87 Nc P10 6 88 Nc P10 5 89 Nc P10 4 90 Nc P10 3 91 Nc P10 2 92 Nc P10 1 93 Nc 94 Avss uP_A DAnalogGND P10 0 95 Nc 96 Vref uP_A DReferenceV oltage 97 Avcc uP_AnalogVcc3 3V P9 7 98 Nc P9 6 99 Panel_VCTL H Panel Power SupplyEnable ActiveH P9 5 100 Reset_Out L Reset Signal at Lower Level wit...

Page 18: ...ge on the electrode of lamp at this time we named starting voltage 2 Stup 2 After light up the lamp cause by the current impedance of the lamp will goes down so the voltage on the lamp will also decrease to a satble state at this time we call the voltage on the lamp named working voltage For keeping the lihgting that need current flow on the lamp at this time we named the current to be output curr...

Page 19: ... e r t o O Z 9 6 5 d a t a b o o k 3 L Co s c i l l a t o rc o n t r o l 3 L Co s c i l l a t o rc o n t r o l 3 L Co s c i l l a t o rc o n t r o l 3 L Co s c i l l a t o rc o n t r o l 3 L Co s c i l l a t o rc o n t r o l l EUse O2 circuit frame let N P power MOSFET switch on and of EUse O2 circuit frame let N P power MOSFET switch on and of EUse O2 circuit frame let N P power MOSFET switch on ...

Page 20: ...i fi e ro fc o n t ro lI C t o s t a b l et h eo u t p u tc u r r e n t Note OVP Over Voltage Protection SCP Short Circuit Protection UVL Under Voltage Lockout Functional Block Diagram SCP NDRV ZVS CONTROLLER PDRV SST NDR PDR Vdd ENA OPS CT RT REF IBIAS REFERENCE 2 50V HCLMP LCLMP ADJ FB CMP GND PULSE GEN ACTIVE HIGH EA LAMP ON OFF Vmax Vmin fix value V V Vmax Vmax Vmin V Vmax V V Vmin Vmin UNDER ...

Page 21: ...01 is a USB hub control IC made by ATMEL NOTE When the monitor power circuit is turned on a 5V power is fed to I203 Upon the detection of about 4 5V I203 begins to generate a reset signal of 450msec Than control Q204 to turn on Q203 input Vcc to I201when I201 enables communication with a higher port when UD and UD from the USB connector are applied to pin 14 and pin 15 respectively Pin 16 17 18 19...

Page 22: ...nc signal 10 8 1 Checking the control circuit of horizontal sync pulse 10 8 2 Checking the control circuit of vertical sync pulse 11 9 Checking the resolution change IC movement 12 10 No power on 13 11 Checking the DC DC converter circuit 15 12 Checking the operation of CPU 16 13 Checking the audio circuit 17 14 Check the USB hub circuit Atmel Version 18 14 1 Hub isn t recognize 18 14 2 Connection...

Page 23: ...Computer 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 ...

Page 24: ...nu is displayed on screen when you push the NEXT 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...

Page 25: ... being outputted under the condition that a LCD module is connected to P301 pin 39 OK NG Failure point 1 I305 failure 2 Printed wire broke between I305 and P301 pin 39 Check the H sync pulse of negative polarity is output on P301 pin 35 at TTL level OK NG Failure point 1 I305 failure 2 Printed wire broke between I305 and P301 pin 35 Check the V sync of negative polarity are output on P301 pin 36 O...

Page 26: ...in 37 OK NG 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 OK NG Failure point 1 I305 failure 2 Printed wire broke between I305 and P301 data line Failure point 1 The cable broke between P301 and LCD module 2 LCD module failure ...

Page 27: ... TTL high level OK NG Is a H level being output in the TTL level from I306 pin 22 Or is BLON signal of the rectangle being output NG Failure point Printed wire broke between I306 pin 22 Check the Bright signal of the input from I306 pin 1 is a Bright signal OK NG Failure point 1 Printed wire broke between I306 pin 1 and I307 pin 7 2 I307 failure Failure point 1 Inverter cable disconnection 2 Inver...

Page 28: ...d P301 P303 2 I305 failure Check the negative horizontal sync pulse output to P301 pin 35 from I305 pin 56 at TTL level OK NG Failure point 1 Printed wire broke between I305 pin 56 and P301 pin 35 2 R325 open 3 C386 short Check the negative vertical sync pulse output to P301 pin 36 from I305 pin 55 at TTL level OK NG Check the positive DE pulse output to P301 pin 37 from I305 pin 54 at TTL level O...

Page 29: ... resolution change IC movement section 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 3 Printed wire broke between I306 pin 35 and I305 pin 94 4 Printed wire broke between I306 pin 36 and I305 pin 95 5 Printed wire broke between I306 pin 37 and I305 pin 89 ...

Page 30: ...306 pin 36 OK NG Failure point 1 I303 failure 2 Printed wire broken between I303 pin 67 to I305 pin 129 Is the R G B data output from I303 to I305 OK NG Failure point 1 I303 failure 2 Printed wire or components broken between I303 and I305 Is the DCLKout from I305 pin 53 to P301 pin 39 OK NG Failure point 1 I305 failure 2 Printed wire or components broken between I305 pin 53 to P301 pin 39 Is the ...

Page 31: ...I304 pin 5 and P302 pin 12 or I304 pin 6 and P302 pin 15 may have failed 4 FB307 R323 FB308 R324 open 5 Cable failure Write Confirm the Q308 are On and I304 pin 7 at low level OK NG 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 I304 pin 5 and P302 pin 12 or I304 pin 6 and P302 pin 15 may have fai...

Page 32: ...TL level OK NG Process Checking the resolution change IC movement section Failure point 1 Video cable may have failed 2 Printed wire broke between P302 pin 13 and I302 pin 13 3 FB323 R302 open Process Checking I302 pin 8 Output at TTL level OK NG Process Checking I302 pin 13 Input at TTL level OK NG Failure point 1 Printed wire broke between I302 pin 8 and I306 pin 19 I305 pin 127 2 FB305 open Fai...

Page 33: ...ecking the resolution change IC movement section Failure point 1 Video cable may have failed 2 Printed wire broke between P302 pin 14 and I302 pin 1 3 FB322 R301 open Process Checking I302 pin 4 Output at TTL level OK NG Process Checking I302 pin 1 Input at TTL level OK NG Failure point 1 Printed wire broke between I302 pin 4 and I306 pin 17 I305 pin 128 2 FB304 open Failure point I302 failure ...

Page 34: ... converter circuit section OK NG Is 10MHz clock output from X302 at TTL level OK NG Failure point 1 Printed wire broke between X302 and I306 pin 11 pin 13 2 I306 failure Is 16 934MHz clock input to I305 pin 20 at TTL level OK NG Is 16 934MHz clock output from X301 at TTL level OK NG Failure point I305 failure Failure point Print wire broke between X301 and I305 pin 20 pin 21 Failure point X301 Fai...

Page 35: ...ck F801 D801 P801 and repair them Yes No Check pin 6 of I801 have same pulse or not Check R805 R803 ZD802 Q801 I801 and repair them Yes No Check pin 3 of T802 have same pulse or not Check peripheral components of I801 and repair them e g Q805 Q806 Yes No Check peak voltage of R811 triangle pulse is up to 1 volt or not Check Q803 R813 R814 D806 R812 and repair them Yes No Check D809 D810 C816 C821 ...

Page 36: ...power on II Check the 5V power is supplied from power source OK NG Failure point Power source failure Is LED turned on in amber momentarily when a power button is pushed OK NG Failure point Power source failure Proceed Checking the operation of CPU ...

Page 37: ...utput from I312 pin 2 OK NG Is the 3 3V input to I311 pin 1 and 3 OK NG refer to section 10 No Power On Failure Point 1 I312 failure 2 I312 output circuit short to ground OK NG Failure Point Printed wire or components broke between I312 output to I311 input Is the 2 5V output from I311 pin 7 and 8 OK NG Failure Point 1 does I311 pin 4 puller up to 3 3V 2 I311 Failure 3 I311 output circuit short to...

Page 38: ... output circuit Is 10MHz clock input to I306 pin 11 and 12 at TTL level OK NG Failure point X302 failure Check the Reset circuit after CPU 3 3V stable than I306 pin 10 delay more than 20ms Low level stage and from Low level change to 3 3V High level OK NG Failure point 1 Printed wire broke between I306 pin 10 and I309 pin 6 output circuit 2 I309 failure I306 failure ...

Page 39: ...d to I314 pin 4 9 Failure point Audio cable disconntction OK NG Failure point 1 Printed wire broke between J301 pin 2 3 and I314 pin 4 9 2 R374 R376 open 3 R378 R379 short 4 C464 C465 open Is output wavefrom being outputted in I314 pin 14 17 OK NG Is 12V supplied to I314 pin 15 16 OK NG Failure point 1 Speaker cable disconnection 2 Speaker failure Proceed section 10 Checking the No power on Is mut...

Page 40: ...pen OK NG Failure point Q203 Doesn t R232 open NG Failure point R232 open OK Doesn t R235 open Failure point R235 Doesn t Q204 open Failure point Q204 Doesn t R233 open Failure point R233 open Doesn t I203 open Failure point I203 Proceed section 14 5 Check the power supply OK NG NG OK NG OK OK NG Is a 3 3V supplied to I201 Pin3 Doesn t 3 3V to J202 pin3 Failure point I201 Doesn t R201 open Printed...

Page 41: ... stream port cable Is 5V 5 supplied to J204 pin1 Doesn t C215 C216 short with GND Failure point C215 C216 short Is resistance on both ends of R206 less than 1 Ohm Failure point R206 failure Proceed section 14 5 Check the power supply Doesn t L209 open Failure point L209 open Is 5V supplied to IC201 pin 9 Failure point Faulty operation of the over current protection function Proceed section 14 4 Ch...

Page 42: ...vement program hasn t been installed Is there a precaution of it doesn t sometimes move via the hub in the manual of the peripheral which doesn t work Failure point The HUB urn correspondence of connection peripheral Is the pin of J204 pin 2 3 with peripheral is connect with rise_time and fall_time less than 20 nsec In the pin of J204 pin 2 3 which peripheral is connect with rise_time and fall_tim...

Page 43: ...ss than 0 8V Failure point I201 failure Failure point X201 failure Isn t I201 pin 15 fixed on the High level more than 2 0V and isn t pin14 fixed on the Low level less than 0 8v Failure point Faulty operation of the host PC Does it have the High Level more than 4 75V from I201 Pin 9 Does R234 open Failure point R234 failure Does Q205 short Failure point Q205 failure Does Q201 short Failure point Q...

Page 44: ...n II Is the 5V input to Q203 E and I203 pin 2 OK NG Failure point 1 L214 open 2 Printed wire broke between J201 and Q203 E with I203 pin 2 Is High Level output from I203 pin 1 OK NG Failure point I203 failure Is Low Level at Q204 pin 1 c OK NG Failure point 1 R233 open 2 Q204 Failure Is the 5V output from Q203 OK NG Failure point Q203 failure Printed wire broke between Q203 output and I201 pin 1 ...

Page 45: ... DIODE ZNR RLZ TE 11 5 6B LL 34 7 D312 6412019418 DIODE RLS 73 TE 11 LL 34 8 I301 6442023338 IC Linear AIC1086 33CY 3P SOT 9 I302 6446006218 IC TTL 74LVC14 14P TSSOP TI 10 I303 6444009508 IC CMOS AD9883 80P MQFP AD 11 I304 6448018208 IC 24LC02B 8PIN SOP MICROCHIP 12 I305 6444009608 IC CMOS M66611FPÑ1 44P6Q A MIT 13 I306 6448017908 IC CPU M30620FGMGP 100P 6Q A M 14 I307 6442001908 IC LM358DT 8P SOP...

Page 46: ...000 DIODE BRIDGE TS4B05G 01 TSC 33 D802 6412001704 DIODE 1N4148 T26 NS 34 D803 6412007924 DIODE SWITCHING FUF4006AMP 1A 35 D804 6412004347 DIODE FUF4002AMP 1A 100V T52 36 D809 6412015210 DIODE YG902C 02 10A 200V FU 37 D810 6417000720 DIODE BRIDGE YG802C04 FUJI 38 I801 6442022010 IC Linear KA3842AE S 8P PDIP F 39 I802 6442014000 IC Linear LTV 817D 4P PDIP LIT 40 I803 6442001340 IC Linear ka431az 3P...

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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