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Acer H235H Service Manual
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Acer H235H Service Manual

Acer computer monitor user manual
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Acer H235H
Service Guide
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  • Page 1 Acer H235H Service Guide...
  • Page 2 Service Guide Version and Revision Version Release Date Revision History Customer model TPV model HD9SA6MK8XAYDC May.-13-2009 Initial Release H235H HD9GA6MK8XABDC...
  • Page 3 Any Acer Incorporated software described in this manual is sold or licensed "as is". Should the programs prove defective following their purchase, the buyer (and not Acer Incorporated, its distributor, or its dealer) assumes the entire cost of all necessary servicing, repair, and any incidental or consequential damages resulting from any defect in the software.
  • Page 4 DIFFERENT part number code to those given in the FRU list of this printed Service Guide. You MUST use the list provided by your regional Acer office to order FRU parts for repair and service of customer machines. Warning: (For FCC Certified Models) Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.
  • Page 5 Precautions Do not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub, swimming pool or in a wet basement. Do not place the monitor on an unstable trolley, stand, or table. If the monitor falls, it can injure a person and cause serious damage to the appliance.

  • Page 6: Table Of Contents

    Chapter 1 Monitor Features Introduction Electrical Requirements LCD Monitor General Specification LCD Panel Specification Factory Preset Timing Monitor Block Diagram Main Board Diagram Power Board Diagram Software Flow chart Main Board Layout Installation Chapter 2 Operating Instructions User Controls Front Panel Controls eColor Management (OSD) How to Adjust a Setting How To Optimize The DOS-Mode...

  • Page 7: Chapter 1 Monitor Features

    50k hours or more. Panel Signal Interface Sync Type Color Temp User Adjust Speaker Headphone Jack Microphone Jack USB Hub Tilt / Swivel Chart of H235H LTM230HT01 A03(003) SZ SEC D-Sub 15pin;DVI 24pin;HDMI Separate / Compatible Support DDC2B Yes /No Chapter 1...
  • Page 8 Electrical Requirements of H235H Standard Test Conditions All tests shall be performed under the following conditions, unless otherwise specified. Warm up time AC supply voltage Ambient temperature Humidity Display mode e-color mode Contrast control Color temperature Brightness control Analog Input signal...

  • Page 9: Electrical Requirements

    LCD Monitor General Specification See the image on next page.
  • Page 10 55.2 6.45 17.2 27.0...

  • Page 11: Lcd Panel Specification

    LCD Panel Specification of H235H LTM230HT01 is a color active matrix liquid crystal display (LCD) that uses amorphous silicon TFT (Thin Film Transistor) as switching components. This model is composed of a TFT LCD panel, a driver circuit and a back light unit.
  • Page 12 Optical Specifications...

  • Page 14: Factory Preset Timing

    Factory Preset Timing of H235H...

  • Page 15: Monitor Block Diagram

    Monitor Block Diagram The LCD MONITOR will contain a main board, a power board, and 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 16: Main Board Diagram

    Main Board Diagram Key control Interface (CN401) Flash Memory EN25F20 (U402) EEPROM M24C02 (U406) Connector Crystal 12MHz Panel Interface (X401) (CN404) Scalar IC TSUMO58GDJ-LF (Include MCU, ADC, OSD) (U401) H sync V sync D-Data D-Clock EEPROM M24C02 (U405) D-Sub Connector (CN403) (CN402) Audio Digital-to-Analog...

  • Page 17: Power Board Diagram

    Power Board Diagram AC input EMI filter PWM Control (IC901) Output Circuit Lamp Feedback Circuit Bridge Transformer Rectifier and Filter Start Resistor (R904, R905) Power Switch (Q901) Photo coupler (IC903) Transformer (PT801) PWM Control Rectifier diodes Feedback MOSFET (Q805,Q806) TA9687GN (IC801) Circuit ON/OFF...

  • Page 18: Software Flow Chart

    Software Flow Chart...
  • Page 19 Remark: 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 20: Main Board Layout

    Main Board Layout...
  • Page 21 Symbol Description U401 IC TSUMO58GDJ-LF-1 U402 IC EN25F20-100GCP X401 14.31818MHZ/32PF/49US0 U405 M24C02-WMN6TP U406 M24C04-WMN6TP U503 M24C02-WMN6TP Symbol Description U601 IC PCM1754DBQR SSOP-16 U603 IC PA6019A4 CN401 WAFER CN402 D-SUB 15PIN CN403 DVI 24PIN CONN F CN501 HDMI HEADER 19P +SCREW HOLE...

  • Page 22: Installation

    Installation To install the monitor on your host system, please follow the steps below: Steps 1 Connect the video cable a Make sure both the monitor and computer are switched off. b Connect the VGA video cable to the computer. c Connect the digital cable (only for dual-input models).

  • Page 23: Attaching The Base

    Attaching the Base 1 Attach the monitor stand arm to the base. 2 Ensure that the base is locked onto the monitor stand arm. SCREEN POSITION ADJUSTMENT To optimize the viewing position, you can adjust he monitor tilt, using both of your hands to hold the edges of the monitor.

  • Page 24: Chapter 2 Operating Instructions

    Chapter 2 Operating 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 26: How To Adjust A Setting

    How to Adjust a Setting...

  • Page 28: How To Optimize The Dos-Mode

    How to Optimize The DOS-Mode Plug And Play Plug & Play DDC2B Feature This monitor is equipped with VESA DDC2B capabilities according to the VESA DDC STANDARD. It allows the monitor to inform the host system of its identity and, depending on the level of DDC used, communicate additional information about its display capabilities.

  • Page 29: Chapter 3 Machine Disassembly

    Chapter 3 Machine Disassembly This chapter contains step-by-step procedures on how to disassemble the monitor- H235H for maintenance. The tool for disassembly is as follows: Screwdriver, Hexagonal screwdriver, Putty knife. Disassembly Procedure 1.Lay the monitor on a flat, soft and clean surface.
  • Page 30 (2)Pry the monitor up then find out the hooks’ position, use the tool (like the picture or other card) to insert into the gap of bezel and rear cover...
  • Page 31 Turn over the monitor and take off the rear cover. (3)Remove the four screws remarked in red to remove the hinge,...
  • Page 32 (4)Disconnected the connector remarked in green to remove the bezel. PS: be careful to Disconnect the Key board connector, because the keyboard connector maybe damage. 4. Remove the lamp connectors and the LVDS cable to remove the panel. Key board install: The audio cable should be layout as show...
  • Page 33 LVDS cable 5. Remove the five screws remarked in red.
  • Page 34 6. Remove the five screws remarked in red and disconnected remarked in green to remove the main board and power board. Main board Power board...
  • Page 35 7.The panel...

  • Page 36: Chapter 4 Troubleshooting

    Troubleshooting This chapter provides troubleshooting information for the H235H: 1. No Power Press power key and look if the picture is normal Please reinsert and make sure the AC of 100-240 is normal Measure U104 Pin2=1.8V, U103 PIN2=3.3V Check if X401 oscillate waveforms are...
  • Page 37 2. No Picture (LED is orange) No picture The button if under control Measure U104 Pin2=1.8V, U103 PIN2=3.3V X401 oscillate waveform is normal Check HS/VS from CN402 is normal Replace U401 X401 oscillate waveform is normal Check reset circuit of U401 is normal Replace U401 Check CN101, U104 and U103...
  • Page 38 3. Panel Power Circuit White screen Measure Q106 base is low level? Check CN404 is solder and Q106, Q104 is OK? Check Correspondent component. Replace PANEL X401 oscillate waveform is normal Check reset circuit of U401 is normal Replace U401 Replace X401 Check Correspondent component.
  • Page 39 4. Key Board OSD is unstable or not working Connect Key Board Is Key Pad Board connecting normally? Replace Button Switch Is Button Switch normally? Replace Key Board Is Key Pad Board normally? Check Main Board...
  • Page 40 5. Power Board 1) No power Check CN902 PIN3, 4 = 5V Check AC line volt 110V or 220V Check the voltage of C905 (+) Check start voltage for the pin3 of IC901 Check the auxiliary voltage is bigger than 11V and smaller than 25V Check IC901 pin8 PWM wave Check D906/D907/D908/IC903/Q903/ZD902...
  • Page 41 2.) No Backlight Check if the input voltage of inverter part is 16V Check ON/OFF signal Check IC801 PIN10=16V Check IC801 PIN5 have triangle wave Check IC801 PIN8/PIN9 PWM wave Check the output of PT801 Check connecter & lamp Check adapter part Check Interface board Check ON/OFF circuit Change IC801...

  • Page 42: Chapter 5 Connector Information

    Connector Information D-sub connect and DVI connect: 15-Pin Color Display Signal Cable 24-Pin Color Display Signal Cable Chapter 5...
  • Page 43 19-pin color display signal cable...

  • Page 44: Chapter 6 Fru (Field Replacement Unit) List

    NOTE: To scrap or to return the defective parts, you should follow the local government ordinance or regulations on how to dispose it properly, or follow the rules set by your regional Acer office on how to return it. Exploded Diagram (Model: H235H)
  • Page 45 SCREW TPV Part No. A34G1361AGBA1B0130 Q05G6104 1 A33G0714BDZ 1L0100 Q05G6104 1 A33G0713AGC 1L0100 A15G0820101 Q37G0151011 A34G1362AEOA1M0100 A33G0715AGB 1X0100 A34G1365AGB 1B0100 0G1G1130 8120 0M1G1730 6120 0Q1G 930 8 47 CR3 0M1G 140 6125 ACER Part NO. Q`ty 60.LHF0B.003 60.LHF0B.006 60.LHF0B.005 60.LHF0B.004...
  • Page 46 Part List Above picture show the description of the following component. Picture Description TPV Part No. Main_frame A15G0820101 Bezel A34G1361AGBA1B0130 Panel 750GLG230F1A33N000 Power Board PWPC9D41EQKP ACER Part NO. 60.LHF0B.006 60.LHF0B.003 LK.23006.001 55.LHF0B.002...
  • Page 47 Main Board CBPCRA6ABQ4 55.LHF0B.001 Q37G0151011 BASE ASS'Y 60.LHF0B.005 A34G1136AEM 1B0130 Rear cover A34G1362AEOA1M0100 60.LHF0B.004...

  • Page 48: Chapter 7 Schematic Diagram

    0.1uF 16V 100uF/16V TO263 NC/AIC1084-18PM T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL acer H235H G3266-1B-X-X-3-090512 TPV MODEL 絬 隔 瓜 絪 腹 Key Component 2.0.POWER PCB NAME 715G3266-E Tuesday , May 12, 2009...
  • Page 49 C467 0.1uF 16V ZD418 RLZ5.6B T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL acer H235H G3266-1B-X-X-3-090512 TPV MODEL 絬 隔 瓜 絪 腹 3.0.INPUT PCB NAME 715G3266-E Date Tuesday , May 12, 2009 Sheet...
  • Page 50 100R 1/16W 5% CN407 CONN T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL acer H235H 絬 隔 瓜 絪 腹 G3266-1B-X-X-3-090512 TPV MODEL Key Component 4.0.SCALER PCB NAME 715G3266-E Date Tuesday , May 12, 2009...
  • Page 51 LVDS Wafer CONNECT CONN RXO0- RXO0+ RXO1- RXO1+ RXO2- RXO2+ RXOC- RXOC+ RXO3- RXO3+ RXE0- RXE0+ RXE1- RXE1+ RXE2- RXE2+ RXEC- RXEC+ RXE3- RXE3+ NC CONN Panel_VCC OEM MODEL acer H235H TPV MODEL PCB NAME 715G3266-E Sheet Size <称爹> 称爹...
  • Page 52 0.1uF 16V 0.1uF 16V 0.1uF 16V T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL acer H235H G3266-1B-X-X-3-090512 TPV MODEL 絬 隔 瓜 絪 腹 Key Component 6.0.HDMI INPUT PCB NAME 715G3266-E Date Tuesday , May 12, 2009...
  • Page 53 R641 NC C642 C640 NC R640 T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL acer H235H G3266-1B-X-X-3-090512 TPV MODEL 絬 隔 瓜 絪 腹 Key Component 7.0.AUDIO PCB NAME 715G3266-E Sheet Date Tuesday , May 12, 2009...
  • Page 54 Power board BD901A KBP208G BD901 GBU408 C905 R904 1500PF2KV 8.2K OHM 1/4W 120uF450V C938 R905 C904 8.2K OHM 1/4W NC(0.22UF275V) L901 27mH IC901 COMP GNDOUT LD7576 C940 C903 0.047uF 0.47UF275V R902 R901 1M 1/4W 5% 1M 1/4W 5% NR901 NTCR C928 0.01uF F901...
  • Page 55 +16V ZD802 ON/OFF RLZ5.6B R803 5K1 1/8W 5% R802 22R 1/8W 5% R805 C801 0.047uF R801 10K 1/10W 5% R807 10K 1/10W 5% NDR1 PDR1 VDDA R812 TIMER 100K 1/10W 1% ISEN OVPT R806 R815 R808 100K 1/10W 1% 390R 1/10W 1% C818 R813 1.5UF/10V...

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