User manual GERICOM 340S8 SERVICE MANUAL

[. . . ] Chapter 5 Troubleshooting Guidelines 1. 1 System features 1. 1. 1 General features a. Support cost efficient CPU, - Celeron-128K Socket 370 Type FCPGA 500~700 MHz - Pentium III Socket 370 Type FCPGA 500~1. 0GHz b. Superior portability with all in one design c. Support high quality audio include 2 internal high power speaker d. [. . . ] Close the display panel, press down the middle cover and then pull out to remove. 16. Unfasten one screws of the CD-ROM ( or DVD-ROM drive). 17. On the bottom case, push out the CD-ROM drive as shown in the photo. 340S8 Rev : A Page 44 Chapter 5 Troubleshooting Guidelines 18. Unfasten six (6) screws on the bottom case. 19. Grasp the top cabinet as shown in the photo and gently lift to release the snap lock. Do the same procedure on both side of the top cabinet. 20. After releasing the snap lock on both side and palm rest. Lift up to release and remove the top cabinet. 21. Close the display panel and unfasten four (4) screws on both sides of the display hinges. 340S8 Rev : A Page 45 Chapter 5 Troubleshooting Guidelines 22. Unfasten one (1) screw on the LCD cable and disconnect the two LCD cables from the mainboard connectors. 23. Unfasten two (2) screws on the hinge frame as shown in the photo. 24. Disconnect the Touchpad cable. 340S8 Rev : A Page 46 Chapter 5 Troubleshooting Guidelines 26. Unfasten three screws on the top housing ( Magnesium alloy). To remove the mainboard together with the top housing, push in the PCMCIA eject button and on the other hand, lift the mainboard assembly and separate it from the bottom case. 27. At the bottom side of the mainboard, unfasten two (2) screws on the modem card. And disconnect the modem card from the mainboard. 28. Unfasten the two (2) hexagonal screws of the modem card. 29. On the bottom side of the mainboard, unfasten four (4) screws on the mainboard shielding and peel off the aluminum foil near the I/O port as shown in the picture. 30. From the I/O port, unfasten six (6) hexagonal screws on the I/O ports. 340S8 Rev : A Page 47 Chapter 5 Troubleshooting Guidelines 31. Starting from the I/O port portion, flip over the mainboard shielding. 32. Lift the mainboard and disconnect the speaker cable and LID switch cable. 33. When replacing mainboard, make sure to have all the insulation and thermal pads removed from the defective mainboard and transfer it to a good mainboard ( because sometimes, the good mainboard doesn't have all the tapes and thermal pad as indicated in the photo). 340S8 Rev : A Page 48 Chapter 5 Troubleshooting Guidelines 34. [. . . ] try another working printer and cable Re-test OK? Yes Correct it No No Setup OK?Yes Replace motherboard Correct it Board level troubleshooting Check PIO controller, for cold solder? Yes Re-solder No One of the following parts on the motherboard maybe defective, plug PIO loopback at PIO port one a time and test, if error replace PIO controller 340S8 Rev : A Page 68 Chapter 5 Troubleshooting Guidelines 5. 13 Audio failure Symptom: No sound from speaker after audio drive is installed. 2. check whether cables, speakers & audio drivers are installed properly try another working speaker & cable Yes Re-test ok?Yes Replace motherboard Correct it Correct it Board-level troubleshooting Check SIS 630 Chipset for cold Solder Yes Re-soldering No One of the following parts on the motherboard may be defective, replace the audio controller chip 340S8 Rev : A Page 69 Chapter 5 Troubleshooting Guidelines 5. 14 No power symptom: Symptom: When the power button is pressed, nothing happens, power indicator is not light up. No Power Yes Check Fuse on DC/DC Board if open Replace it No Yes Check DC/DC Board Signal or replace each parts. [. . . ]