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HP F1523 - Pavilion - 15" LCD Monitor, Service Manual

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HP F1523 - Pavilion - 15

Page 16

vf15 / FP15 / f1523 / FP5315

3. Checking the back light unit

Is +12V supplied to CN101

 pin 1, 2 to inverter PWB?

OK

NG

Failure point

Inverter cable disconnection.

Check the INV_EN signal input to Inverter Board Q104 at TTL high level.

OK

NG

Is a "H" level being output in the TTL level from I303 pin 114

Or, is INV_EN signal being output?

NG

Failure point

Printed wire broke between I303 pin 114

and Inverter Board Q104.

Check the PWM signal of the input from I303 pin 40 is a BRI signal

OK

NG

Failure point

1)Printed wire broke between
   I303 pin 40 and Q313, Q312.
2)I303 failure

Failure point

1) Inverter of LCD module failure.

Summary of Contents for F1523 - Pavilion - 15" LCD Monitor

Page 1: ...Service Manual 15 inch LCD Monitor vf15 FP15 f1523 FP5315 ...

Page 2: ...oduced translated or converted to any electronic or machine readable form without prior written permission of LiteOn Technology Corp vf15 FP15 f1523 FP5315 Service Manual 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 Mar 17 2003 Original release ...

Page 3: ...trol 7 10 4 Control of identification converter LSI IC306 8 10 5 Power ON sequence 9 10 6 Power OFF sequence 10 11 Audio Circuit 11 2 Trouble shooting 1 No display of screen Screen is black color of LED is amber 12 2 Nothing displays on screen Screen is black color of LED is green 13 3 Checking the back light unit 16 4 Abnormal screen 17 5 No OSD display 18 6 Abnormal plug and play operation 19 7 ...

Page 4: ... 8 Checking the resolution change IC movement 21 9 Checking the DC DC converter circuit 22 10 No power on 23 11 Checking the panel circuit 24 12 Checking inverter board circuit 25 3 Recommended Parts List Recommended Parts List 26 ...

Page 5: ...01 I801 starts to oscillate and outputs a pulse train through pin 6 to drive Q803 1 7 2 OPP When Q803 turns on C805 supplies a linearly increasing triangle current through the primary inductance of T802 to the driver Q803 once the peak value of this current multiplied by R811 exceeds1 volt pulse train will be turn off immediately to protect Q803 T802 from being burned out 1 7 3 Regulation If outpu...

Page 6: ...ovide regulation of the CCFL current from feedback The non inverting reference pin 10 of I101 is at 1 25V nominal 2 3 7 Protection Open lamp protection in the ignition period is provided through both pin1 and pin 2 of I101 Removal of the CCFL during normal operation will trigger Q107 to turns on and shuts off the inverter This is latch function 2 3 8 Output drivers The configuration prevents any s...

Page 7: ...am MAIN PWB gm2115 5 Video input circuit Circuit diagram MAINPWB The AC coupled video signal is used to clamp the black level at 0V 6 DefinitionconverterLSIperipheralcircuit Circuit diagramMAINPWB I303 gm2115 is the definition converter LSI The analog R G B signal input entered from the video input circuit is converted into the digital data of video signal through the incorporated A D converter Ba...

Page 8: ...ut pressing the POWER switch 10 2 Display mode identification 10 2 1Functions 1 Display mode identification l The display 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 resolution or vertical sync signal and the discrimination signal HSYNC_DETECT VSYNC_DETECT l When the mode has been id...

Page 9: ...e the measuring range of gm2115 l If the vertical sync signal is outside the measuring range of gm2115 Table 1 Polarity Mode No Resolution H freq KHz Band Width MHz H V 1 102 VGA 720 x 400 70Hz 31 47 28 322 2 103 VGA 640 x 480 60Hz 31 47 25 175 3 173 VESA 640 X 480 72Hz 37 86 31 5 4 109 VESA 640 X 480 75Hz 37 5 31 5 5 116 VESA 800 x 600 60Hz 37 88 40 6 110 VESA 800 x 600 75Hz 46 88 49 5 7 117 VESA...

Page 10: ...dated as required 10 4 Control of definition converter gm 2115 I303 10 4 1Ports related to control 10 4 2Functions Major function of I303 are as follows 1 Expansion of the display screen 2 Timing control for various signal types 3 Power supply sequence LCD panel Port Pin No I O Signal name Function Remarks GPIO21 47 I Power Power Switch Key GPIO3 43 I MANUAL Menu Switch input MENU key GPIO7 47 I D...

Page 11: ...Page 9 vf15 FP15 f1523 FP5315 10 5 Power ON sequence ...

Page 12: ...Page 10 vf15 FP15 f1523 FP5315 10 6 Power OFF sequence ...

Page 13: ...d 9 through the low pass filter consisting of R305 R306 C314 and C315 In this amplifier controls of Volume are availavle The audio signal controlled at the VR601 determines the attenu ation of output of the amplifiers Since then the signal is output to the jack P303 11 2 Audio output The audio signal is output from the jack output terminal P303 of the jack board to the internal speaker system ...

Page 14: ... is output and if the video cable is connected normally No Proceed No OSD 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 NO SIGNAL INPUT or it is indicated with OUT OF RANGE at the time of the frequency that it can t be distinguished ...

Page 15: ...s NG Refer Checking the backlight unit section OK Check OSD menu is displayed on screen when you push the MENU 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 Next Page ...

Page 16: ...oke between I303 and P308 pin 3 Check the pulse of POL HMS2 HMS1 LP STH are output on P308 pin 44 45 46 47 48 at TTL level OK NG Failure point 1 I303 failure 2 Printed wire broke between I303 and P308 pin 44 45 46 47 48 Check the CLKV STV1 pulse are output on P307 pin 7 8 OK NG Next Page Failure point 1 I302 failure 2 Printed wire broke between I303 and P307 pin 7 8 Failure point 1 Printed wire br...

Page 17: ... Check the data signal output on P307 and P308 R G B data pin OK NG Failure point 1 I303 failure 2 Printed wire broke between I303 and P307 P308 data line Failure point 1 The cable broke between P307 P308 and LCD module 2 LCD module failure ...

Page 18: ... Q104 at TTL high level OK NG Is a H level being output in the TTL level from I303 pin 114 Or is INV_EN signal being output NG Failure point Printed wire broke between I303 pin 114 and Inverter Board Q104 Check the PWM signal of the input from I303 pin 40 is a BRI signal OK NG Failure point 1 Printed wire broke between I303 pin 40 and Q313 Q312 2 I303 failure Failure point 1 Inverter of LCD module...

Page 19: ...t 3 C339 open 4 R332 open OK NG Failure point 1 Printed wire broke between I303 data line and P307 P308 2 I303 failure Check pulse of POL HMS2 HMS1 LP STH are output to P308 pin 44 45 46 47 48 at TTL level OK NG Failure point 1 Printed wire broke between I303 and P308 of control line 2 LZ301 LZ312 open or RP303 RP314 open 3 CN301 CN312 short Check the pulse of CLKV STV1 are output to P307 pin 7 8 ...

Page 20: ...523 FP5315 5 NO OSD display OK NG Confirm the MENU key is pressed at that moment Proceed Checking the resolution change IC movement section Failure point 1 Function key is destroyed 2 FB305 open 3 RP302 open 4 I303 failure ...

Page 21: ...ve connections for DDC 2 Between I308 pin 6 and P305 pin 12 may have failed 3 R405 R323 open 4 Cable failure Confirm the input of serial data on I308 pin 5 SDA at TTL level NG OK Failure point I308 failure Failure point 1 The host machine isn t communicating in DDC mode 2 The video cable may have failed or may not to have connections for DDC 3 Between I305 pin 5 and P305 pin 11 may have failed 4 R...

Page 22: ...iled 2 Printed wire broke between P305 pin 14 and I304 pin 2 3 FB320 R336 open Process Checking the resolution change IC movement section 7 2 Checking the control circuit of vertical sync pulse Check the horizontal sync signal on I304 pin 11 and pin 8 TTL level OK NG Failure point 1 Video cable may have failed 2 Printed wire broke between P305 pin 3 and I306 pin 11 3 FB311 R334 open Process Checki...

Page 23: ...at TTL level OK NG Failure point Print wire broke between X301 and I303 pin 152 Failure point X301 failure Is Low Reset pluse signal input to I303 pin 5 about 10 mesc OK NG Check the output Low Reset signal from I305 pin 4 OK NG Is 5 0V supplied to I305 pin 5 Failure point I303 failure Failure point Print wire broke between I305 pin 4 and I303 pin 5 OK NG Failure point I305 failure Failure point P...

Page 24: ...e between I309 pin 1 and FB331 Failure point I309 failure Failure point Printed wire broke between I309 pin 4 and I303 power supply pin Check the output of 2 5V line voltage from I309 pin 5 OK NG Is the output FB331 being inputted to I309 pin 1 OK NG Failure point Printed wire broke between I309 pin 1 and FB331 Failure point I309 failure Failure point Printed wire broke between I309 pin 5 and I303...

Page 25: ...t 1 Power board failure 2 I301 failure Is there 5V DC ouput pin of P309 OK NG Failure point 1 Power board failure 2 C418 C416 C417 short 3 I309 failure Is there 3 3V and 2 5V output from pin 4 of I309 and pin 5 OK NG Failure point 1 I309 failure Precess section 8 Checking the resolution change IC movement ...

Page 26: ...K NG Failure point D321 D322 D323 D324 D320 failure Failure point 1 F301 open 2 Q308 failure Failure point I311 failure 11 2 Check the output of 3 6V on FB341 OK NG Is the input voltage of 9 2V on Q310 collector OK NG Process above item 11 1 OK NG Failure point Printed wire broke between FB341 and P307 Failure point 1 D325 failure 2 R401 VR1 R399 open Failure point I312 failure Check adjustable vo...

Page 27: ...m OK NG Check pin 18 of I102 is triangle pulse Check Q106 D110 and repair them Check pin 4 of I102 there is soft start edge up to 4V and pin 11 12 19 20 there is some pulse output Check C115 R108 I102 and repair them Check pin 2 of I102 there is up to 2V from output detection Repair I102 Check full bridge I101 I103 D102 D103 C123 work right Check R120 D108 R116 CR101 and repair them Repair them Ch...

Page 28: ...CHL 8 Q106 6423000708 TRANSISTOR PNP SST3906 T116 9 I308 6448018208 IC 24L C02B 8P SOP MICROCHIP 10 I304 6446006218 IC 74LBC14 14P TSSOP TI DB Package 11 I303 6444010616 IC gm2115 CG 208P PQFP Genesis 12 I307 6444011108 IC NC7WB3125 FAIRCHILD 13 I306 6448016508 IC 24LC16B SN 8P SOP Microchip 14 I305 6442033808 IC Linear BD4743G 5Pin ROHM 15 I309 6442033908 IC Linear FAN1537PA 5PIN 16 I311 64420336...

Page 29: ...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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