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18.5" LCD Color Monitor
Service
Service
Service
Description
Table Of Contents......................................................1
Revision List........................................................2
1. Monitor Specification...............................................3
2. LCD Monitor Description........................................4
3. Operation Instruction...........................................5
3.1. General Instructions.........................................5
3.2. Control Button......................................................5
3.3 Adjusting the Picture....................................... ..6
4. Input/Output Specification......................................10
4.1. Input Signal Connector........................................10
4.2. Factory Preset Display Modes...........................10
5. Panel Specification.........................................11
5.1. General Feature...............................................11
5.2. Optical Characteristics....................................11
6. Block Diagram.....................................................15
6.1 Software Flow Chart.......................................15
6.2.Electrical Block Diagram...........................17
7. Schematic.....................................................19
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING ELECTRONIC
EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

TABLE OF CONTENTS

Page Description
7.1 Main Board....................................................19
7.2 Power Board...............................................24
7.3 Key Board..................................................26
8.PCB Layout.......................................... ........ ..... ...27
8.1. Main Board.................................................27
8.2. Power Board..........................................28
8.3. Key Board...............................................30
9. Maintainability................................................31
9.2. Trouble Shooting......................................32
9.2.1 Main Board..........................................32
9.2.2 Power Board.......................................34
9.2.3 Key Board..........................................36
11.Mechanical Instructions.................................39
12. Monitor Exploded View.....................................42
13. BOM List.....................................................43
14. Different Parts List...............................................53
SAFETY NOTICE
1
HP LE1851w
Horizontal Frequency
24- 83 kHz
Page

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Table of Contents

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   Summary of Contents for HP LE1851w

  • Page 1: Table Of Contents

    18.5" LCD Color Monitor HP LE1851w Service Service Service Horizontal Frequency 24- 83 kHz TABLE OF CONTENTS Description Page Description Page Table Of Contents..……......…..1 7.1 Main Board..………........19 7.2 Power Board.….……........24 Revision List.…........……..2 7.3 Key Board…………………………………………..26 1. Monitor Specification......………..3 8.PCB Layout..……..........27 2.
  • Page 2: Revision List

    18.5" LCD Color Monitor HP LE1851w Revision List Version Date Revision History TPV Model Name T89MM5DBRWHPNNE T89MM5DBRWHPNCE Initial release T89SM5DBRWHPNNE Mar.-16-2009 T89SM5DBRWHPNCE M185B1-L02 Panel List in Item 5 LTM185AT01 Q01 / Q02...
  • Page 3: Monitor Specification

    18.5" LCD Color Monitor HP LE1851w 1. Monitor Specification...
  • Page 4: Lcd Monitor Description

    18.5" LCD Color Monitor HP LE1851w 2. LCD Monitor Description The LCD Monitor will contain main board, power board, a key 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 5: Operation Instruction

    18.5" LCD Color Monitor HP LE1851w 3. Operation Instructions 3.1 General Instructions The monitor settings can be adjusted from the On-Screen Display (OSD) menu. To access the OSD and adjust screen settings base on your viewing preference, do the following: 1.
  • Page 6: Adjusting The Picture

    18.5" LCD Color Monitor HP LE1851w 3.3 Adjust the Picture...
  • Page 7 18.5" LCD Color Monitor HP LE1851w...
  • Page 8 18.5" LCD Color Monitor HP LE1851w...
  • Page 9 18.5" LCD Color Monitor HP LE1851w...
  • Page 10: Input/output Specification

    18.5" LCD Color Monitor HP LE1851w 4. Input/Output Specification 4.1 Input Signal Connector 4.1.1 D-SUB connector Signal Signal Red Video +5V Supply Green Video Logic Ground Blue Video DDC-Serial Data DDC-Return H-Sync. Red Ground V-Sync. Green Ground DDC-Serial Clock Blue Ground...
  • Page 11: Panel Specification

    18.5" LCD Color Monitor HP LE1851w 5. Panel Specification 5.1 General Feature M185B1-L02 LTM185AT01 Q01/Q02 5.2 Optical Characteristics M185B1-L02...
  • Page 12 18.5" LCD Color Monitor HP LE1851w LTM185AT01 Q01/Q02...
  • Page 13: Parameter Guide Line For Ccfl Inverter

    18.5" LCD Color Monitor HP LE1851w 5.3 Parameter guide line for CCFL Inverter 1.TFT LCD Module: M185B1-L02 LTM185AT01 Q01/Q02 2. Back Light Unit: M185B1-L02...
  • Page 14 18.5" LCD Color Monitor HP LE1851w LTM185AT01 Q01/Q02...
  • Page 15: Block Diagram

    18.5" LCD Color Monitor HP LE1851w 6. Block diagram 6. 1 Software Flow Chart...
  • Page 16 18.5" LCD Color Monitor HP LE1851w REMARK: 1) MCU initialize. 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.
  • Page 17: Electrical Block Diagram

    18.5" LCD Color Monitor HP LE1851w 6.2 Electrical Block Diagram 6.2.1 Scalar Board Panel Interface (CN403) EPR_SDA EPR SCL Scalar TSUM1PFR-LF FLASH MEMORY (Include ADC、OSD、MCU) PM25LV010A (U402) (U401) H sync V sync EEPROM D-Sub Connector M24C04 (CN101) (U403) DB15_SDA, DB15 SCL...
  • Page 18 18.5" LCD Color Monitor HP LE1851w 6.2.2 Inverter / Power Board AC input Bridge Rectifier EMI filter Transformer diodes Rectifier and Filter CN902 Start Circuit Feedback Over Circuit Voltage Control IC Protect ON/OFF Transformer MOSFET Resonance Lamp Over ON/OFF Feedback...
  • Page 19: Schematic

    03.Scalar 04.Output T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL Size HP L1908w LE1851w G3083-1E-X-X-2-090210 TPV MODEL 絬 隔 瓜 絪 腹 Key Component 01.COVER & REVISE HISTORY & TOP PCB NAME 715G3083-1E <称爹>...
  • Page 20 M24C02-WMN6TP DDC_WP DGND T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL Size HP L1908w LE1851w G3083-1E-X-X-2-090210 TPV MODEL 絬 隔 瓜 絪 腹 Key Component 02.Input PCB NAME 715G3083-1E <称爹> 称爹 Wednesday , February 18, 2009...
  • Page 21 MODE[1] M24C04-WMN6TP VCC3.3 CONN CN401 KEY 1 KEY 2 POWER_KEY # LED_GRN/BLUE LED_ORANGE HP L1908w LE1851w Custom T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL Size G3083-1E-X-X-2-090210 TPV MODEL 絬 隔 瓜 絪 腹...
  • Page 22 18.5" LCD Color Monitor HP LE1851w PA[0..1] PA[0..1] R434 has to be changed PANEL_VCC from 0805 to 1206 PA[4..9] PA[4..9] CN403 PANEL_VCC CN402 PB[0..9] C417 PB[0..9] R429 330 OHM 1/4W 0.1uF/16V CONN For single channel CMVCC CMVCC 5,7 R430 C418 10K 1/16W 5% 0.1uF/16V...
  • Page 23 C707 C706 VCTRL 0.1uF/16V 100UF16V T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL HP L1908w LE1851w Size G3083-1E-X-X-2-090210 TPV MODEL 絬 隔 瓜 絪 腹 Key Component 05.Power PCB NAME 715G3083-1E <称爹> 称爹 Tuesday , February 10, 2009...
  • Page 24: Power Board

    18.5" LCD Color Monitor HP LE1851w 7.2 Power Board R918 100 OHM 1/4W L904 R919 +12V 1.0uH 100 OHM 1/4W C912 ZD902 0.001uF C930 RLZ13B R920 R946 100 OHM 1/4W C917 C918 C922 150 OHM 2W 0.1uF 470PF50V 680uF 25V...
  • Page 25 18.5" LCD Color Monitor HP LE1851w CONN C839 R821 1500PF/50V T801 R817 1K 1/8W POWER X'FMR 10K 1/10W 1% CN801 R855 D805 15R 1/4W LL4148 C819 C801 F801 0.0022uF 30pF/3KV +12V 0 OHM 1/4W R804 Q801 C802 C824 R856 R801...
  • Page 26: Key Board

    (MENU) (Minus) (Plus) (OK/Auto) (Power) T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL HP LE1851w / LE2001w Size G3457-B-X-X-1-081212 TPV MODEL 絬 隔 瓜 絪 腹 Key Component 2.0.key PCB NAME 715G3457-B <称爹> 称爹...
  • Page 27: Pcb Layout

    18.5" LCD Color Monitor HP LE1851w 8. PCB Layout 8.1 Main Board...
  • Page 28: Power Board

    18.5" LCD Color Monitor HP LE1851w 8.2 Power Board...
  • Page 29 18.5" LCD Color Monitor HP LE1851w...
  • Page 30: Key Board

    18.5" LCD Color Monitor HP LE1851w 8.3 Key Board...
  • Page 31: Maintainability

    18.5" LCD Color Monitor HP LE1851w 9. Maintainability 9.1Equipments and Tools Requirement 1. Multi-meter. 2. Oscilloscope. 3. Pattern Generator. 4. DDC Tool with a Compatible Computer. 5. Alignment Tool. 6. LCD Color Analyzer. 7. Service Manual. 8. User Manual.
  • Page 32: Trouble Shooting

    18.5" LCD Color Monitor HP LE1851w 9.2 Trouble Shooting 9.2.1 Main Board 1、No power No power Press power key and look if the picture is normal Please reinsert and make sure the AC of 100-240 is normal Reinsert or check the power section Measure U104 PIN 2=3.3V...
  • Page 33 18.5" LCD Color Monitor HP LE1851w No picture (LED is orange) No picture Measure U104=3.3V Replace U104 X401 oscillate waveforms are normal Replace X401 Check if the sync signal from computer is output and video cable is connected normally Input the sync signal of computer, or...
  • Page 34: Power Board

    18.5" LCD Color Monitor HP LE1851w 9.2.2 Power Board 1. No Power No power Check AC line volt 110V or 220V Check AC line Check the voltage of C907(+) Check F901, bridge rectified circuit Check start voltage for the pin8of IC901...
  • Page 35 18.5" LCD Color Monitor HP LE1851w 2. W/LED No Backlight Check Q805 =12V Check Q805 Check ON/OFF signal Check Interface board Check IC801 pin2=5V ? Change D817,R827 Check the pin1 of IC801 have saw tooth wave Change IC801 Check Q802 has the output of square wave at short time.
  • Page 36: Key Board

    18.5" LCD Color Monitor HP LE1851w 9.2.3 Key Board OSD is unstable or not working Is Keypad board connecting normally? Connect Keypad Board Is Button Switch normally? Replace Button Switch Replace Keypad Board Is Keypad board normally? Check main board...
  • Page 37: White-balance, Luminance Adjustment

    6500K color temp. parameter is x = 313±15, y = 329 ±15, Y>200 cd/m 3. Into factory mode of HP LE1851w Turn on power, press the Menu button, pull out the power cord, and then plug the power cord. Then the factory OSD will be at the left top of the panel.
  • Page 38 18.5" LCD Color Monitor HP LE1851w B. Adjust sRGB color-temperature 1. Switch the chroma-7120 to sRGB channel. 2. The chroma 7120 will show x = 313 ±15, y = 329 ±15, Y >170 cd/m 3. Switch the chroma 7120 l to RGB MODE ( with press “MODE” button to change ) 4.
  • Page 39: Mechanical Instructions

    18.5" LCD Color Monitor HP LE1851w 11. Mechanical Instructions Step Figure Description Lay the monitor on a flat, soft Preparation and clean surface. Remove the decorate cover Remove the and the screws stand to remove the stand. Remove the Remove the...
  • Page 40 18.5" LCD Color Monitor HP LE1851w Remove the Remove the screws to bezel remove the bezel Remove the screws marked Remove the in red and to main frame remove the main frame Remove Remove the panel panel...
  • Page 41 18.5" LCD Color Monitor HP LE1851w 1.Remove the screws marked in red to remove the Power Remove Boardand Main main board Board. and power 2.Disconnect board the connector and remove the Power Board and Main Board.
  • Page 42: Monitor Exploded View

    18.5" LCD Color Monitor HP LE1851w 12. Monitor Exploded View...
  • Page 43: Bom List

    HARNESS 30P-24P 150MM 0D1G1730 8120 SCREW 0M1G 140 10225 CR3 SCREW 705GH934005 HP 18.5" STAND ASS'Y 705GH934006 HP 18.5" KEY PADD ASS'Y 750GLM185B1232Z0HP PANEL M185B1-L02 C2 NB CMO A15G0656101 mainframe A34G1177AAA 3B0130 Rear cover LE1851 H40G 18N690 1A ID LABEL...
  • Page 44 18.5" LCD Color Monitor HP LE1851w 0Q1G 140 12120 SCREW 4X12 A15G0725101 Base_btm_plate A34G1178AAA 1B0100 Stand_column LE1851 A34G1179AAA 1B0130 BASE LE1851 A34G1184AAA 1B0100 Stand_column_front LE1851 A37G0111 1 Hinge A33G0597DAMA1L0100 button LE1851 A34G1176AAAA1B0130 Bezel LE1851 KEPC9HA1 KEY BOARD G3457-1-X-X-1-090317 Q01G6019 1...
  • Page 45 18.5" LCD Color Monitor HP LE1851w L901 073L 174 40 HG GBQM4.778.391 T801 080GL17T 40 H XFMR INVERTER DADON T901 080GL19T 26 T X'FMR 610uH SRW24LQL-T15H016 CN901 087G 501 32 S AC SOCKET D905 093G3006 1 1 31DQ06FC3 NIHON INTER...
  • Page 46 18.5" LCD Color Monitor HP LE1851w R104 061G0402101 6805 RST CHIPR 100 OHM +-5% 1/16W R110 061G0402101 6805 RST CHIPR 100 OHM +-5% 1/16W R111 061G0402101 6805 RST CHIPR 100 OHM +-5% 1/16W R113 061G0402101 6805 RST CHIPR 100 OHM +-5% 1/16W...
  • Page 47 18.5" LCD Color Monitor HP LE1851w R115 061G0402750 6857 RST CHIPR 75 OHM +-5% 1/16W R118 061G0402750 6857 RST CHIPR 75 OHM +-5% 1/16W R101 061G0603000 6857 RST CHIPR 0 OHM +-5% 1/10W R429 061G1206331 6857 RST CHIP 330 OHM 1/8W 5%...
  • Page 48 18.5" LCD Color Monitor HP LE1851w FB102 071G 59K190 B 19 OHM BEAD FB103 071G 59K190 B 19 OHM BEAD D101 093G 64 42 P BAV70 SOT23 BY PAN JIT ZD101 093G 39S 24 T RLZ 5.6B LLDS D703 093G 52S 7 T...
  • Page 49 18.5" LCD Color Monitor HP LE1851w R801 061G0603150 1F6857 RST CHIPR 1.5k OHM 1% 1/10W R814 061G0603150 1F6857 RST CHIPR 1.5k OHM 1% 1/10W R930 061G0603243 1F6857 RST CHIPR 2.43KOHM +-1% 1/10W R940 061G0603330 2F6857 RST CHIPR 33KOHM +-1% 1/10W...
  • Page 50 18.5" LCD Color Monitor HP LE1851w R918 061G1206101 6857 RST CHIPR 100 OHM +-5% 1/4W R855 061G1206150 6857 RST CHIPR 15 OHM +-5% 1/4W R856 061G1206150 6857 RST CHIPR 15 OHM +-5% 1/4W R912 061G1206221 6857 RST CHIPR 220 OHM +-5% 1/4W...
  • Page 51 18.5" LCD Color Monitor HP LE1851w ZD905 093G 39S 44 T RLZ18B LLDS D916 093G 64S522SEM LL4148 D915 093G 64S522SEM LL4148 D903 093G 64S522SEM LL4148 D817 093G 64S522SEM LL4148 D814 093G 64S522SEM LL4148 D812 093G 64S522SEM LL4148 D807 093G 64S522SEM...
  • Page 52 18.5" LCD Color Monitor HP LE1851w J911 095G 90 23 JUMPER WIRE J902 095G 90 23 JUMPER WIRE J905 095G 90 23 JUMPER WIRE J811 095G 90 23 JUMPER WIRE J801 095G 90 23 JUMPER WIRE J802 095G 90 23...
  • Page 53: Different Parts List

    18.5" LCD Color Monitor HP LE1851w 14. Different Parts List Diversity of T89MM5DBRWHPNCE compared with T89MM5DBRWHPNNE Location Part No. Description Remark 750GLM185B1232D0HP PANEL M185B1-L02 C2 NB CMO Diversity of T89SM5DBRWHPNNE compared with T89MM5DBRWHPNNE Remark Location Part No. Description E750 750GLS185AT112Z0HP...

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