HP R15AAC Service Manual

15-inch lcd monitor
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Service Manual
15-inch LCD Monitor
R15AAC/AAU (vs15)

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  Summary of Contents for HP R15AAC

  • Page 1 Service Manual 15-inch LCD Monitor R15AAC/AAU (vs15)
  • Page 2 This manual may not, in whole or in part, be respective owners. copied, photocopied, reproduced, translated, or converted to any electronic or machine readable form without prior written permission of LiteOn Technology Corp. HP HPD_R15AAC/AAU(vs15) Service Manual. Printed in Taiwan.
  • Page 3: Table Of Contents

    R15AAC/AAU (vs15) 1) Power Board Operation Therory Therory of Power Board Operation ----------------------------------------------------------------------------------------- 4 2) Inverter Circuit Inverter Circuit ----------------------------------------------------------------------------------------------------------------- 5 3) Interface Operation 3.1 Top --------------------------------------------------------------------------------------------------------------------------- 6 3.2 Power ------------------------------------------------------------------------------------------------------------------------ 6 3.3 VGA & DDC interface ----------------------------------------------------------------------------------------------------- 6 3.4 Scaler GM5321 ------------------------------------------------------------------------------------------------------------- 7 3.5 Key &...
  • Page 4 R15AAC/AAU (vs15) Checking the interface circuit of sync signal ---------------------------------------------------------------------------- 22 9.1 Checking the control circuit of horizontal sync pulse for VGA -------------------------------------------------- 22 9.2 Checking the control circuit of vertical sync pulse VGA ---------------------------------------------------------- 22 10. Checking the resolution change IC movement -------------------------------------------------------------------------- 23 11.
  • Page 5 R15AAC/AAU (vs15) 1). Power Board Operation Therory 1.1 Line filter consists of C801, T801, C802, C803, C804, C809, C815, C838, R801. It eliminates high frequency interference to meet EMI’s requirement. 1.2 Rec & Filter Bridge diode D801 converts AC source into pulsed DC. This pulsed DC is smoothed and filtered by C805. R802 is an NTC ( negative thermal coefficient ) resistor, used to reduce inrush current to be within safe range.
  • Page 6: Inverter Circuit

    R15AAC/AAU (vs15) 2) Inverter Circuit This unit operates on an output voltage of 21.5V from power source. VDD: R105 get a +5VDC for I101 power supply. Control IC: I101 (OZ9930) 2.2.1 Enable : When pin 1 of I101 is over 0.55V, I101 works. If it is under 0.55V, I101 turns off.
  • Page 7: Top

    R15AAC/AAU (vs15) Interface Operation Top (Circuit diagrams sheet 2 of 8) This page is function block. (1) Power. (2) VGA & DDC interface. (3) Scaler GM2621. (4) Key & panel interface. (5) Audio Power (Circuit diagrams sheet 3 of 7) 3.2.1 P301 connector...
  • Page 8: Scaler Gm5321

    R15AAC/AAU (vs15) Scaler gm2621 (Circuit diagrams sheet 5 of 7) The I307 gm2621 is all-in-one LCD monitor controller. The gm2621 leverages Genesis patented advanced image-processing technology as well as a proven integrated ADC/PLL. Gm2621 also integrates a micro-controller, an OSD controller, and dual LVDS.
  • Page 9: Key & Panel Interface

    R15AAC/AAU (vs15) Key & Panel interface (Circuit diagrams sheet 6of 7) 3.5.1 P306 connector It is LVDS bus, it is from I307 scaler to LCD panel module. The output voltage is 3.3V. 3.5.2 P307 connector The P307 has support keypad function. Control is give effect to for the push switch to be used when the user changes the parameters, in order to modify the respective setting values.
  • Page 10: Audio

    R15AAC/AAU (vs15) Audio (Circuit diagrams sheet 7 of 7) 3.6.1 P307 connector The P307 is audio signal input from the keypad function board. 3.6.2 P308 connector The P308 have two audio function signals. One is audio volume control from the keypad function board.
  • Page 11: Others

    R15AAC/AAU (vs15) Others 3.7.1 Detection of POWER switch status The I307 gm2621 identifies the ON status of the two power supplies. The identification is made when the power supply is turn off. For example, if the power supply is turn off with the POWER switch, the POWER switch must be turn on when active the power supply again.
  • Page 12 R15AAC/AAU (vs15) Table 2 video mode Mode Resolution H-Freq Band Width Polarity (KHz) (MHz) 640x480 (59.94Hz) 31.469 25.175 640x480 (72Hz) 37.861 31.5 640x480 (75Hz) 37.5 31.5 720x400 (70Hz) 31.469 28.322 800x600 (60Hz) 37.879 800x600 (72Hz) 48.077 800x600 (75Hz) 46.875 49.5 832x624 (74.55Hz)
  • Page 13: List Of I/O Pin Assignments Of The I311

    R15AAC/AAU (vs15) 3.7.3 List of I/O Pin Assignments of the I311 Pin No. Port Signal Name Initial Function Setting GPIO0 LED_B LED green enable GPIO1 LED_A LED amber enable GPO4 BKLT_ADJ Backlight brightness control GPO2 MUTE Mute Audio GPO3 AUDIO_PW...
  • Page 14: For Power Board

    R15AAC/AAU (vs15) Trouble shooting For Power Board Check output voltage +5V, +12V, +21.5V are 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, P101, P102, P103,...
  • Page 15: For Inverter Board

    R15AAC/AAU (vs15) For Inverter Circuit on Power Board Check C102 pin is around 5V. On/Off pin of P802 is over 2V. Brightness pin is between 0V and 3.5V/ It is not inverter problem Check pin6 of I101 is 5V Check R105, C102 and repair them. Check printed wire.
  • Page 16: No Display Of Screen (Screen Is Black, Color Of Led Is Amber)

    R15AAC/AAU (vs15) No display of screen (Screen is black, color of LED is amber) Does OSM display when you push PROCEED buttom. Proceed "No OSM display" section. When a sugnal isn't being inputed, it is indicated with "VIDEO INPUT". it is indicated with "OUT OIF RANGE"...
  • Page 17: Nothing Displays On Screen (Screen Is Black, Color Of Led Is Green)

    R15AAC/AAU (vs15) 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 output signal with Does computer output RGB video signals? all black only.
  • Page 18 R15AAC/AAU (vs15) Continue Check the 5V power are supplied on P306 pin 1, 2, 3 (to the LCD panel) Check if theVoltage on I304 pin2 that is DC power at 3.3V. Failure Point 1) I304 failure Check if the TTL level on I301 pin1 that TTL level is low (0~0.8V).
  • Page 19: Checking The Back Light Unit

    R15AAC/AAU (vs15) Checking the back light unit Is +12V supplied to inverter PWB ? (by the power board) Failure Point 1) Inverter cable disconnection. 2) Power board failure. Check the BKLT_EN signal of the rectangle input P302 pin 6 at TTL high level.
  • Page 20: Abnormal Screen

    R15AAC/AAU (vs15) Abnormal screen 6.1 Abnormal screen for VGA source Check the R, G, B video signal from computer input on P302 of video connector. Failure Point 1) No R, G, B video signals output from host computer, check computer.
  • Page 21: Abnormal Osm Display Adjust Problem

    R15AAC/AAU (vs15) Abnormal OSM display adjust problem Check the input DC voltage level whether was changed when pressed function keys on the P307 pin 8, 9. (normal is low level, when push buttom, generated a DC level plus) (Refer table 1) Failure Point 1) Function key wire disconnection.
  • Page 22: Abnormal Plug And Play Operation

    R15AAC/AAU (vs15) Abnormal plug and play operation Abnormal plug and play operation for VGA Confirm the host computersupplies DDC2 mode. Failure Point The host machine is not communicatiog in DDC2 mode. Check the voltage on P302 pin9 that is power DC 5 V.
  • Page 23: Checking The Interface Circuit Of Sync Signal

    R15AAC/AAU (vs15) Checking the interface circuit of sync signal 9.1 Checking the control circuit of horizontal sync pluse for VGA Check the horizontal sync signal on P302 pin13 TTL level. Failure Point VGA Video cable is failure. Check the horizontal sync signal on I307 pin189 TTL level.
  • Page 24: Checking The Resolution Change Ic Movement

    R15AAC/AAU (vs15) 10. Checking the resolution change IC movement Check +3.3V supply on I307 pin2, 25, 47, 53, 91, 92, 74, 82, 101, 110, 116, 128. Proceed " Checking the DC/DC converter circuit" section. Check +1.8V supply on I307 pin118, 87, 55, 17, 86, 78, 70, 104, 106.
  • Page 25: Audio No Signal Output

    R15AAC/AAU (vs15) 11. Audio no signal output Check the audio signal input from the audio source. Failure Point 1) No audio signal from the audio source. 2) Audio cable is failure. Check audio signal input of the I312 TDA7496SA pin5 .
  • Page 26 R15AAC/AAU (vs15) Continue Check I312 pin10 Mute if is high level. Failure Point 1) Printed wire broke between I307 pin57 and Q309and I312 pin10. 2) R383, R384, R385, R338, C393 are open or short. 3) Q312 is filure. 4) I307 is failure.
  • Page 27: Recommended Spare Parts List

    R15AAC/AAU (vs15) 5) Spare Parts 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 28: Block Diagram

    R15AAC/AAU (vs15) Block Diagram Page 27...
  • Page 31 Allen Lai R15AAX SCHEMATIC REV 02 PTB-1579 Nov 22 2004 ROAD MAP DESCRIPTION SHEET NO. TITLE SHEET POWER VGA & DDC INTERFACE SCALER GM5621 KEY & PANEL INTERFACE AUDIO REVISION HISTORY REV. DESCRIPTION LAST UPDATE BASED ON PTB-1551 Rev.0C SCHEMATICE FOR LITEON Oct 05 '04 Revrsion change Allen Lai...
  • Page 32 5.KEY & PANEL INTERFACE 3.VGA & DDC INTERFACE 4.SCALER GM5621_6 R2P_CH3P_LV_E R2P_CH3P_LV_E R2P_CH3P_LV_E R2P_CH3P_LV_E R2N_CH3N_LV_E R2N_CH3N_LV_E R2N_CH3N_LV_E R2N_CH3N_LV_E GNDR GNDR R1P_E R1P_E GNDR GNDR R1P_E R1P_E R1N_E R1N_E R1N_E R1N_E R0P_E R0P_E GNDG GNDG GNDG GNDG R0P_E R0P_E R0N_E R0N_E R0N_E R0N_E G2P_CH0P_LV_E...
  • Page 33 VCC5V VCC5V P301 FB301 PBY160808T-121Y-S R301 FB302 PBY160808T-121Y-S R302 BACKLIGHT_ADJ BACKLIGHT_EN FB303 PBY160808T-121Y-S R304 C301 C302 R303 Q301 BKLT_ADJ BKLT_ADJ 5 VCC15V C303 C304 C305 MMBT3904 0.1uF(NC) 16.9K JWT-A2001WV2-08 0.1uF 0.01uF 22uF/16V C306 C307 0.1uF 47uF/25V R305 BKLT_EN BKLT_EN 5 C308 R306 0.1uF...
  • Page 34 P302 VGA_RED FB308 FB309 SBK160808T-600Y-S RED_IN R313 C325 10nF RIN 5 VGA_5V VGA_GREEN FB310 GREEN FB311 SBK160808T-600Y-S R314 C326 10nF GNDR GNDR 5 VGA_CONn BLUE VGA_BLUE FB312 FB313 SBK160808T-600Y-S VGA_SDA D301 D302 D303 GREEN_IN MMBD7000 MMBD7000 MMBD7000 R315 C327 10nF GIN 5 VGA_HSYNC R316...
  • Page 35 3V3_LV VCC3V3 3V3_RPLL 3V3_RPLL FB316 PBY160808T-121Y-S 3V3_AVDD 3V3_DVDD 1V8_CVDD 1V8_AVDD C340 C341 0.1uF I307 VCC3V3 3V3_AVDD FB317 PBY160808T-121Y-S 3V3_RPLL C342 C343 C344 C345 C346 C347 15pF 10uF/16V 0.1uF 0.1uF 0.1uF 0.1uF T_ROE X301 ROE/GPIO_8 T_ROE 6 14.318MHZ XTAL T_RSP T_RSP 6 XTAL RSP/GPIO_9 TCLK...
  • Page 36 VLCD P304 P305 P306 B2P_E B2P_O B2P_E B2P_O B2N_E B2N_O B2N_E B2N_O R2N_CH3N_LV_E R2N_CH3N_LV_E B1P_E B1P_O R2P_CH3P_LV_E B1P_E B1P_O R2P_CH3P_LV_E B1N_E B1N_O CLKN_LV_E B1N_E B1N_O CLKN_LV_E CLKP_LV_E CLKP_LV_E B0P_E B0P_O G0N_CH2N_LV_E B0P_E B0P_O G0N_CH2N_LV_E B0N_E B0N_O G0P_CH2P_LV_E B0N_E B0N_O G0P_CH2P_LV_E G1N_CH1N_LV_E G1N_CH1N_LV_E G2P_CH0P_LV_E...
  • Page 37 I312 P309 P308 FB322 PBY160808T-121Y-S R372 AUDIO_IN_L C385 0.22uF AMP_IN_L C386 470uF/25V OUT_L OUTL AMP_IN_R OUT_R FB323 PBY160808T-121Y-S R373 AUDIO_IN_R C387 0.22uF C388 470uF/25V OUTR PH-JACK-3P D313 D314 R374 R375 C391 C392 AMP_MUTE JWT-A2001WV2-03 MUTE MMSZ5232B(NC) MMSZ5232B(NC) 47pF 47pF C393 STBY VAO_L D315...
  • Page 38 R117 1000P 2N7000 100K 1N4148 R119 C120 1uF/50V Sheet: Size: LITE-ON TECHNOLOGY CO. DRAWN: Date: DESIGN: Date: Title: HP-R15AAC NS TSAI NS TSAI 10-7-2004 10-7-2004 TITLE SHEET CHECK: Date: CHECK: Date: DWG.NO: 8815630000-01 STEPHEN SC LIN 10-7-2004 PCB. NO: APPRO:...
  • Page 46 LITE-ON TECHNOLOGY CORP. 16 F, 392, Rueykuang. Road, Taipei, Taiwan Tel: 886-2-87982888 Fax: 886-2-87982829 Printed in Taiwan...

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