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Buffalo BU1715 Service Manual

17” lcd monitor
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Buffalo BU1715

SERVICE MANUAL

17" LCD Monitor
BU1715
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY.EVERY REASONABLE
EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE
THE ACCURACY OFTHIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS
RELIABILITY FOR CHANGES, ERRORS OR OMISSIONS.

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Summary of Contents for Buffalo BU1715

  • Page 1: Service Manual

    Buffalo BU1715 SERVICE MANUAL 17” LCD Monitor BU1715 THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY.EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OFTHIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS...

  • Page 2: Table Of Contents

    Buffalo BU1715 Table of Contents Table of Contents ------------------------------------------------------------------------------------------------------------------ 02 Revision List ---------------------------------------------------------------------------------------------------------------------03 1. Monitor Specification -------------------------------------------------------------------------------------------------------------04 2. LCD Monitor Description -----------------------------------------------------------------------------------------------------05 3. Operation Instructions -----------------------------------------------------------------------------------------------------06 3.1 General Instructions --------------------------------------------------------------------------------------------------06 3.2 Control Button -----------------------------------------------------------------------------------------------------------06 3.3 Adjusting The Picture -------------------------------------------------------------------------------------------------------07 4. Input/Output Specification ----------------------------------------------------------------------------------------------------09 4.1 Input Signal Connector--------------------------------------------------------------------------------------------------------09...

  • Page 3: Revision List

    Buffalo BU1715 Revision List Revision Date Change Description Jul-18-05 Initial release...

  • Page 4: Monitor Specification

    Buffalo BU1715 1. Monitor Specifications Driving system TFT Color LCD Panel M170EG01 Size 43.2 cm (17.0") LCD Panel Pixel pitch 0.264mm(H) x 0.264mm(V) Viewable angle 140° (H) 130° (V) Response time 16 ms (typ.) Video R, G, B Analog Interface Separate Sync.

  • Page 5: Lcd Monitor Description

    Buffalo BU1715 2. LCD Monitor Description The LCD MONITOR will contain a main board, an inverter/power board, an audio board and a keypad board which house the flat panel control logic, brightness control logic and DDC. The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage.

  • Page 6: Operation Instructions

    Buffalo BU1715 3. Operating Instructions 3.1 General Instructions Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the monitor. By changing these settings, the picture can be adjusted to your personal preferences.

  • Page 7: Adjusting The Picture

    Buffalo BU1715 3.3 Adjusting the Picture Steps: 1. Press MENU button to display OSD main menu, Press Left button or Right button may select other main Menu. 2. Press MENU button to adjust items of each main menu. 3. Press Left button or Right button may select item you wish to enter.
  • Page 8 Buffalo BU1715 Main Menu Item Sub Menu Item Sub Menu Icon Description Auto Auto adjust color Color Temp Recall Color Temperature from EEPROM Color Red Setting Red Gain from Digital-register Green Setting Green Gain from Digital-register Blue Setting Blue Gain from Digital-register...

  • Page 9: Input/Output Specification

    Buffalo BU1715 4. Input Specification 4.1 Input Signal Connector PIN NO. Description PIN NO. Description Green Detect Cable Blue Ground DDC-Serial Data Ground H-Sync R-Ground V-Sync G-Ground DDC-Serial Clock B-Ground VGA Connector Layout...

  • Page 10: Factory Preset Display Modes

    Buffalo BU1715 4.2 Factory Present Display Modes VESA MODES Horizontal Vertical Nominal Sync Nominal Sync Nominal Mode Resolution Total Frequency Polarity Freq. Polarity Pixel Clock +/- 0.5kHz +/- 1 Hz (MHz) 640x480@60Hz 800 x 525 31.469 59.940 25.175 640x480@72Hz 832 x 520 37.861...

  • Page 11: Power Supply Requirements

    Buffalo BU1715 4.3 Power Supply Requirement Parameter Description A/C Line voltage range 100 V ~ 240 V 50 ± 3Hz, 60 ± 3Hz A/C Line frequency range 280 volts AC for 10 sec @40℃ Input Voltage transients Current 1.5A max at 100V; 0.8A max at 240 V <...

  • Page 12: Panel Specification

    Buffalo BU1715 4.4 Panel Specification 4.4.1 Panel Feature 4.4.2 General Characteristics...
  • Page 13 Buffalo BU1715 4.4.3 Optical Characteristics...
  • Page 14 Buffalo BU1715 4.4.4 Parameter Guider Liner For CCFL Inverter Backlight Unit:...

  • Page 15: Block Diagram

    Buffalo BU1715 5. Block Diagram 5.1 Monitor Exploded View...

  • Page 16: Software Flow Chart

    Buffalo BU1715 5.2 Software Flaw Chart...
  • Page 17 Buffalo BU1715 1) MCU initializes. 2) Is the EEPROM blank? 3) Program the EEPROM by default values. 4) Get the PWM value of brightness from EEPROM. 5) Is the power key pressed? 6) Clear all global flags. 7) Are the AUTO and SELECT keys pressed? 8) Enter factory mode.

  • Page 18: Electrical Block Diagram

    Buffalo BU1715 5.3 Electrical Block Diagram Diagram 5.3.1 Scaler Board Block LCD Interface (CN503) OSD Control KEY PAD Scalar TSU16AK PQFP-128 20MHz (Include ADC, OSD) MTV512MV CRYSTAL (U401) (U601) EPR_SDA H sync 14.318MHz EPR_SCL V sync CRYSTAL EEPROM M24C16 D-Sub Connector...
  • Page 19 Buffalo BU1715 5.3.2 Inver/Power Board Block Diagram Inverter Block Diagram...
  • Page 20 Buffalo BU1715 Power Block Diagram...

  • Page 21: Schematic Diagram

    Buffalo BU1715 6.Schematic Diagram 6.1 Main Board TSU16AK SCHEMATIC GNDR GNDR GNDG GNDG DDC_CLK VCC1.8 VCC3.3 VAA1 VAA2 VAA3 VAA4 DDC_DAT GNDB GNDB ST_DET1 HSYNC HSYNC VSYNC VSYNC DVI_DET VCC1.8 DDCCI_SEL VCC3.3 VAA1 VAA2 VAA3 CLK+ CLK+ VAA4 CLK- CLK- DDC_WP 3.INPUT...
  • Page 22 Buffalo BU1715 VCC5V+ VCC5V SOT-252 D202 U201 VCC12V R202 GS1D VCC1.8 VCC12V AZ1117D-1.8 CN201 　 1/16W VCC1.8 ON_OFF R201 4.7K 1/16W 　 C210 C211 C212 VCC12V VCC12V D201 SS14 C201 R212 4.7K 　 1/16W 0.1uF 47uF/16V 0.1uF VCC5V+ VCC5V VCC5V...
  • Page 23 Buffalo BU1715 CN301 DB15 FB301 　 1/16W R301 　 1/16W C304 0.047uF FB302 　 1/16W R302 　 1/16W C305 0.047uF FB303 　 1/16W R303 　 1/16W C306 0.047uF R304 　 1/16W C307 0.001uF PC5V R325 C301 C302 C303 VGA_CON 　...
  • Page 24 Buffalo BU1715 VCC3.3 FB401 VCC1.8 FB402 VCC3.3 VCC1.8 600 OHM 600 OHM C405 C414 10uF/16V 10uF/16V VPLL VDVI VDPLL C406 C407 C408 C409 C410 C411 C412 C413 C415 C416 C417 C418 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF...
  • Page 25 Buffalo BU1715 PA[0..9] PA[0..9] LVA3P CN503 LVA3M LVACKP LVACKM LVB0M RXO0- RXO0+ LVB0P LVA2P LVB1M RXO1- RXO1+ LVB1P LVA2M LVB2M RXO2- RXO2+ LVB2P LVBCKM RXOC- RXOC+ LVBCKP LVA1P RXO3- RXO3+ LVB3M LVB3P LVA1M LVA0M RXE0- RXE0+ LVA0P LVA1M RXE1- RXE1+...
  • Page 26 Buffalo BU1715 VCPU VCPU RN602 RN601 R601 R602 C601 R607 　 1/16W 　 1/16W R606 　 1/16W 　 1/16W 0.1uF 　 1/16W 4/2/2004-change Crystal from 20MHz to 24MHz 　 1/16W R644 R645 R646 C602 22pF 1/16W 　 U601 X601 P1.0 P1.1...

  • Page 27: Power Board

    Buffalo BU1715 6.2 Power/Inverter Board R920 　 1/2W C920 T901 F902 0.001uF/500V D910 FUSE TO INVERTER F10KQ100 L903 BD901 2KBP06M R906 R904 C906 R903 C922 C924 C928 750k 　 1/4W 　 1/4W 0.0015uF/2KV 100K 　 1000uF/16V 470uF/16V 0.1uF CN102 C905...
  • Page 28 Buffalo BU1715 CN201 C215 22pF/6KV Q203 L201 +12V D201 R224 R225 R226 R227 C201 C223 R212 D203 1.5K　 1.5K　 1.5K 1/4W 1.5K 1/4W 　 　 SR24 150uF/25V 150uF/25V C202 C225 3.9K　 RLZ11B C216 Q202 1uF/25V R214 SI4431DY-T1 22pF/6KV 0.1uF/25V PT201 2.2K...

  • Page 29: Audio Board

    Buffalo BU1715 6.3 Audio Board OUT_L OUT_R +12V PIN-3 CN202 WAFER 2*7P 2.54mm MUTE PIN-1 VOLUME C202 C201 C203 470uF/16V 470uF/16V 0.1uF U201 TDA7496L CN204 C205 CN203 C204 0.47uF R201 10K　 OUTL 470uF/16V C206 0.47uF OUTR 10K　 R203 R212 C207...

  • Page 30: Key Pad Board

    Buffalo BU1715 6.4 Key Pad Board CN104 CN102 CN103 PHONEJACK SPK-L SPK-R R101 510 SPKR_R+ CONN CONN R102 510 SPKR_L+ KEY_SEL CN101 KEY_LEFT POWER_ KEY LED_ORANGE KEY RIGHT LED_GRN KEY_SEL KEY_MANU KEY_MANU KEY_RIGHT KEY_LEFT POWER_ KEY LED_ORANGE LED_GRN SPKR_R+ SPKR_L+...

  • Page 31: Pcb Layout

    Buffalo BU1715 7. PCB Layout 7.1 Main Board...
  • Page 32 Buffalo BU1715...

  • Page 33: Power Board

    Buffalo BU1715 7.2 Power Board...
  • Page 34 Buffalo BU1715...
  • Page 35 Buffalo BU1715...

  • Page 36: Audio Board

    Buffalo BU1715 7.3 Audio Board 7.4 KEPC BOARD...

  • Page 37: Maintainability

    Buffalo BU1715 8. Maintainability 8.1 Tools And Requirement 1. Voltmeter. 2. Oscilloscope. 3. Pattern Generator. 4. LCD Color Analyzer. 5. Service Manual. 6. User Manual.

  • Page 38: Troubleshooting

    Buffalo BU1715 8.2 Trouble Shooting 8.2.1 Main Board 1.No Screen Appear Measured CN201 pin5/6 = 12 V? Check Correspondent component. Measured CN201 pin 9/10= 5V? Is there any shortage or cold solder? Measured U202 pin 2= 3.3V? Yes, all DC level exist Yes.
  • Page 39 Buffalo BU1715 2. Panel Power Circuit Check R207 should have response from 0V to 5V Measured X601 waveform is normal? When we switch the power switch from off to on Replace X601 Check Q204, Q203 is broken or CN503 solder abnormal?
  • Page 40 Buffalo BU1715 4. U401-Data Output Check TSU16AK (U401) Signal output (PIN102-103, Measured X401 waveform is 106-113,118-125,128,1) normal? Is the waveform ok? Replace X401 Check HS/VS input signal are Replace U401 normal? Check relative component 8.2.2 Key Board OSD is unstable or not working...
  • Page 41 Buffalo BU1715 8.2.3 Power/Inverter Board 1.) No power Check to CN102 pin12 = 12V Check Interface board Check AC line volt 120V or 220V Check the voltage of C905(+) Change F901; check BD901, Q903, and IC901 Check start voltage for the pin3 of IC901...
  • Page 42 Buffalo BU1715 2.) W / LED, No Backlight Check C201 (+) =12V Check D201/Q209/Q210 Check ON/OFF signal Check Interface board Check U201 pin9=12V voltage of C905(+) Change Q201 or Q202 Check the pin1 of U201 have saw tooth wave Change U201 Check D201 (-), D202 (-) has the output of square wave at short time.

  • Page 43: White-Balance, Luminance Adjustment

    Buffalo BU1715 9. White- Balance, Luminance Adjustment Approximately 2 Hours should be allowed for warm up before proceeding White-Balance adjustment. Before started adjust white balance, please setting the Chroma-7120 MEM. Channel 9 to 9300 K colors; MEM. Channel 10 to 7500 K;...
  • Page 44 Buffalo BU1715 24. Repeat above procedure (item 5,6,7) until chroma 7120 RGB value meet the tolerance =100±2 c. Adjust sRGB (6500 K) color-temperature 1. Switch the chroma-7120 to RGB-mode (with press “MODE” button) 2. Switch the MEM.channel to Channel 01 (with up or down arrow on chroma 7120) 3.

  • Page 45: Edid Content

    Buffalo BU1715 10. EDID Content 112: Note: Byte 0C, 0D, 0E, 0F means Serial No. Byte 10, 11 means manufacture time. Byte 7F means checksum...

  • Page 46: Bom List

    Buffalo BU1715 11. BOM List T780KA4NJSMCA Location Part NO Description Quantity Unit AUPC780ML AUDIO BOARD CBPC780KA4MC CONVERSION BOARD KEPC780KMN KEY BOARD FOR T780K*NMV PWPC7425A3M2 POWER BOARD 15G5786 1 VRSA BRACKET 15G5908 2 BRACKET 15G6090 7 MAIN FRAME 34G1272 Y 5L...
  • Page 47 Buffalo BU1715 Q1G 330 8120 SCREW 3X8mm Q1G 330 10120 SCREW FOR FP/RC Q1G 330 12120 SCREW 3X12mm 705L780KB34 65 BEZEL ASS'Y 750GLU70G01 1 AU 17" V5 (V1) PANEL AM1G1740 10120 SCREW (M4*8) AUPC780MCSMT AUDIO BOARD FOR SMT 12G6051 1...
  • Page 48 Buffalo BU1715 C202 67G215V221 4N KY25VB220-M-CC3 8*11.5M C204 67G215V221 4N KY25VB220-M-CC3 8*11.5M C211 67G215V470 4N KY25VB47-M-CC3.0 5*11MM C215 67G215V470 4N KY25VB47-M-CC3.0 5*11MM C208 67G215Y100 7N KY50VB10M-L 5*11 C405 67G215Y100 7N KY50VB10M-L 5*11 C414 67G215Y100 7N KY50VB10M-L 5*11 C419 67G215Y100 7N...
  • Page 49 Buffalo BU1715 R305 61L0603101 RST SM 0603 RC0603 100R R306 61L0603101 RST SM 0603 RC0603 100R R307 61L0603101 RST SM 0603 RC0603 100R R309 61L0603101 RST SM 0603 RC0603 100R R312 61L0603101 RST SM 0603 RC0603 100R R315 61L0603101 RST SM 0603 RC0603 100R...
  • Page 50 Buffalo BU1715 R614 61L0603103 RST SM 0603 RC0603 10K R615 61L0603103 RST SM 0603 RC0603 10K R625 61L0603103 RST SM 0603 RC0603 10K R626 61L0603103 RST SM 0603 RC0603 10K R627 61L0603103 RST SM 0603 RC0603 10K R644 61L0603103 RST SM 0603 RC0603 10K...
  • Page 51 Buffalo BU1715 R327 61L0603750 RST SM 0603 RC22H 75R P R651 61L0603912 CHIPR 9.1KOHM +-5% 1/10 C617 65G0603101 32 100PF +-10% 50V X7R C307 65G0603102 32 1000PF +-10% 50V X7R C606 65G0603102 32 1000PF +-10% 50V X7R C607 65G0603102 32...
  • Page 52 Buffalo BU1715 C510 65G0603104 32 CHIP 0.1UF 50V X7R C601 65G0603104 32 CHIP 0.1UF 50V X7R C612 65G0603104 32 CHIP 0.1UF 50V X7R C613 65G0603104 32 CHIP 0.1UF 50V X7R C618 65G0603104 32 CHIP 0.1UF 50V X7R C619 65G0603104 32 CHIP 0.1UF 50V X7R...
  • Page 53 Buffalo BU1715 D301 93G 6433P BAV99 D302 93G 6433P BAV99 D303 93G 6433P BAV99 D324 93G 6433P BAV99 D317 93G 39S 39 T MLL5234B D201 93G1004 3 SS14 D202 93G1020 1 S GS1D 715L1423 1512 AIK780KMN KEY BOARD CN103 33G3802 2H...
  • Page 54 Buffalo BU1715 C904 63G 107474 HS 0.47UF +-20% 275VAC C906 65G 2K152 5E6921 1500 PF 10% 2KV Y5P C913 65G306M4722B2 Y1 4700PF +-20% 250VAC C215 65L 3J2206ET 22PF 5% 3KV TDK C216 65L 3J2206ET 22PF 5% 3KV TDK C217 65L 3J2206ET...
  • Page 55 Buffalo BU1715 Q201 57G 760 5A DTC 144WN3/S SOT-23 Q203 57G 763 3B AM9435P.T1-PF SO-8 Q204 57G 763 3B AM9435P.T1-PF SO-8 R929 61L0603000 RST SM 0603 JUMP MAX 0R R931 61L0603102 RST SM 0603 RC0603 1K P R216 61L0603221 RST SM 0603 RC0603 220R...
  • Page 56 Buffalo BU1715 C203 65G0805105 27 CHIP 1UF Y5V 0805 C209 65G0805105 27 CHIP 1UF Y5V 0805 C210 65G0805105 27 CHIP 1UF Y5V 0805 C211 65G0805105 27 CHIP 1UF Y5V 0805 C212 65G0805105 27 CHIP 1UF Y5V 0805 C219 65G0805105 27...
  • Page 57 Buffalo BU1715 R210 61G 60215352T 15KOHM 5% 1/6W R211 61G 60215352T 15KOHM 5% 1/6W R220 61G 60215352T 15KOHM 5% 1/6W R221 61G 60215352T 15KOHM 5% 1/6W R214 61G 60222252T 2.2K 5% 1/6W R215 61G 60222252T 2.2K 5% 1/6W R201 61G 60230352T...
  • Page 58 Buffalo BU1715 C208 65G 44233113T 330PJNPO 50V C398 65G 444471 5T 470P/50V DIP C399 65G 444471 5T 470P/50V DIP C908 65G 450104 7T 0.1UF +80-20% 50V Y5V C920 65L517K102 5T6213 1000PF 10% Y5P 500V C921 65L517K102 5T6213 1000PF 10% Y5P 500V...

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