Asus X421 Series Repair Manual
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Asus X421 Series Repair Manual

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Table of Contents

Disassembly Procedure
2 - 1
V1.0

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Summary of Contents for Asus X421 Series

  • Page 1 Disassembly Procedure 2 - 1 V1.0...
  • Page 2 Disassembly Procedure 2 - 2 V1.0...
  • Page 3 Disassembly Procedure Pre-repair checklist 2 - 3 V1.0...
  • Page 4 Disassembly Procedure Precautions Before you perform any service and or repair on the notebook, please follow the steps below first. 1. Be sure that the notebook is powered down. 2. Disconnect the AC plug from the notebook. 3. Remove all rings, watches and any other metal objects from your hands. 4.
  • Page 5 Disassembly Procedure c. Rusty d. Damaged head – unable to drive in e. Damaged unable to securely tighten BACK 2 - 5 V1.0...
  • Page 6 Disassembly Procedure Appropriate Tools The illustrations below show the appropriate tools that should be used for the notebook’s service and repair. Cross Screwdriver Please according to different screw specification and choose different screwdriver and head. Below photos are for reference only. Use a cross screwdriver to fasten/remove screws.
  • Page 7 Disassembly Procedure Tweezers Use a pair of tweezers to remove/insert flexible cables. Thickness gauge Thickness compass specification 0.05mm-1.5mm Use it to measure the gap. Magnetism Board Suggest local buy magnetism board to place screw, avoid mix different type screw to cause assembly damage.
  • Page 8 Disassembly Procedure The example is X421FL Bottom Case Module The illustrations below show how to remove and disassemble the Bottom Case Module. Remove Bottom Case Module 1. Follow below numbers to remove 9 screws on the Bottom case module. Assembly Notice: Follow the reverse numbers to lock screws. Screw tightening torque (Kg F-cm) 2.0KG±0.2kgf.
  • Page 9 Disassembly Procedure 2. Use disassembly tool to pry up the sides of the top case. X421IA (X421FA has not SSD ABSORBER) 2 - 9 V1.0...

  • Page 10: Battery Module

    Disassembly Procedure Parts ⚫ X421FA-8R BOTTOM CASE ASSY ⚫ Total screw *9 BACK Battery Module The illustration below shows how to remove the battery module. Remove Battery Module Disconnect the battery cable and remove 6 screws on the Battery module then take away the Battery module .
  • Page 11 Disassembly Procedure SCREW M2*4L (4.6,0.8) (K) B-ZN Parts ⚫ X421 BATT/COS POLY/C31N1905 *1 ⚫ Total screw *6 2 - 11 V1.0...

  • Page 12: Ssd Module

    Disassembly Procedure BACK SSD Module The illustration shows how to remove the SSD Module. Remove SSD Module Remove 1 screw on SSD and take it away. Screw tightening torque (Kg F-cm): 2.0KG±0.2kgf. SCREW M2*3L (K) B-ZN,NY X421IA SSD ABSORBER Parts ⚫...

  • Page 13: Thermal & Fan Module

    Disassembly Procedure BACK Thermal & Fan Module The illustration below shows how to remove the Thermal& fan module. Assemble Notice: After replace new MB, please clean remaining CPU and GPU thermal pad on thermal module and then paste new one. Remove Thermal &...
  • Page 14 Disassembly Procedure 2.Remove the two Mylar 2 - 14 V1.0...

  • Page 15: Wlan Module

    Disassembly Procedure SCREW M2*2.5L (4.5,0.8) (K) W-NI Notice：Please use the correct technique of taking fans in order to avoid being out of shape. Correct demonstration Wrong demonstration Parts ⚫ X421FL TH MOD ASM * 1 ⚫ X421FL TH MOD FAN PART* 1 ⚫...
  • Page 16 Disassembly Procedure SCREW M2*2.5L (4.5,0.8) (K) W-NI Parts: ⚫ 802.11AC+BT5.0(1*1)M.2 2230 ⚫ Total screw * 1 BACK IO BD & Motherboard Module The illustrations below show how to separate the IO BD & Motherboard module Remove IO BD Module 1.Remove 6 screws on the hingles Screw tightening torque: 2.5KG±0.2kgf Screw tightening torque: 2.5KG±0.2kgf 2 - 16...
  • Page 17 Disassembly Procedure M2.5*5L (4.6,0.5) (K) B-ZN SCREW SCREW M2.5*4L (4.5,0.8) (K) B-ZN X421DA_DAP M2.5*5L (4.6,0.5) (K) B-ZN SCREW M2.5*4L (4.5,0.8) (K) B-ZN SCREW 2.Remove 2 screws on the IO BD ,disconnect the IO BD cable(MB side),and take it away. 2 - 17 V1.0...
  • Page 18 Disassembly Procedure 2. Disconnect the IO BD cable 2 - 18 V1.0...
  • Page 19 Disassembly Procedure SCREW M2*4L (4.6,0.8) (K) W-NI Remove MB Module 1.Disconnect the Touch Pad FPC, Keyboard FPC,KB back light FPC. EDP cable speaker cable Camera cable Assembly notice: Insert FFC to the bottom until just accord with the line when lock the latch. 2 - 19 V1.0...
  • Page 20 Disassembly Procedure Assembly notice: Please change new one, If FPC or FFC is damage during disassembly. Here are some samples of FPC or FFC damage: 2 - 20 V1.0...
  • Page 21 Disassembly Procedure 2.Remove 5 screws on the main board. Screw tightening torque: 2.0KG± 0.2kgf. SCREW M2*4L (4.6,0.8) (K) W-NI 2 - 21 V1.0...
  • Page 22 Disassembly Procedure Notice: These below picture for your reference for mylar/gasket/sponge etc. of MB. 2 - 22 V1.0...
  • Page 23 Disassembly Procedure Parts ⚫ X421FL MB._8G/I5-10210U/AS *1 ⚫ X421FL IO BD./AS *1 ⚫ X421FA BTM FFC 30P 0.5,L101.5 *1 ⚫ Screw *6 2 - 23 V1.0...
  • Page 24 Disassembly Procedure Speaker Module & Touch pad Moudle The illustrations below show how to remove the Speaker & Touch Pad Module Speaker Module Please well arrange Speaker Cable when you assemble them. Touch pad Moudle Remove 3 screws and take out the Touch pad. Screw tightening torque: 2.0KG±...
  • Page 25 Disassembly Procedure SCREW M2*2L (7,0.55) (K) B-ZN 2. Remove the touchpad cable Notice：add one TP GASKET after assemble.If the GASKETS removed，please use new gaskets （3 pieces） 2 - 25 V1.0...
  • Page 26 Disassembly Procedure Parts ⚫ X421FA SPEAKER *1 ⚫ X421FL-8G TOUCHPAD MODULE *1 ⚫ X421FA TP FFC 8P 0.5MM,L85.5*1 ⚫ X420FA NUM TP GASKET*3 ⚫ Total screw *3 (Actual part name depends on different SKU.) BACK 2 - 26 V1.0...

  • Page 27: Lcd Module

    Disassembly Procedure LCD Module The illustrations below show how to remove and disassemble the LCD Module of the notebook. 1. Use a plastic blade to pry the cap 2. Use a plastic blade to pry the BEZEL 2 - 27 V1.0...
  • Page 28 Disassembly Procedure Notice: Use the thinner plastic blade to pry up the edge . Tips : Usually, it is hard to pry up the inside edge follow below position directly. inside outside First, Use the thinner plastic blade to pry up the red frame area of outside edge. 2 - 28 V1.0...
  • Page 29 Disassembly Procedure Second, insert the thinner plastic blade into the gap and don’t push too hard, disconnect the hooks follow the direction of the red arrow slowly. Notice：If the Bezel is hard to disassemble ，try to use an electric hair drier（power>1000w) to heat the Bezel for about 20 to 30 seconds before disassemble.
  • Page 30 Disassembly Procedure SCREW M2*2L (7,0.55) (K) B-ZN 3. Remove the LCD ADHESIVE. ADHESIVE 2 - 30 V1.0...
  • Page 31 Disassembly Procedure Notice :How to remove LCD Panel adhesive Notice : Please slowly pull the adhesive up about 30 degree. 30゜ 4. Disconnect the EDP Cable 2 - 31 V1.0...
  • Page 32 Disassembly Procedure 5. Remove the camera and disconnect the camera cable 2 - 32 V1.0...
  • Page 33 Disassembly Procedure Notice:The WIFI MAIN ANTENNA no need to remove from the LCD cover, you can order the LCD cover (include the WIFI MAIN ANTENNA) . 2 - 33 V1.0...
  • Page 34 Disassembly Procedure Parts ⚫ X421FA EDP CABLE *1 ⚫ X421FA CMOS CABLE *1 ⚫ LCD 14.0' FHD VWV EDP *1 ⚫ I421FA-9E HINGE COVER ASSY *1 ⚫ X421FA-8G LCD COVER ASSY VB *1 ⚫ X421FA-8R LCD BEZEL ASSY VB *1 ⚫...

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