The computer will not power on

  1. Verify the power outlet is good. Plug a different device into the socket to ensure there is power, or plug computer into another outlet.
  2. Check the power cord. Use a known good power cord.
  3. Check connection of the power cord on both ends. Verify that the plug is securely plugged into both the A/C outlet and back of the computer.
  4. Remove keyboard, mouse, and other peripherals such as speakers.
  5. Position the computer so it rests on the CRT face.
  6. Remove the user access door.

7 Touch a metal surface inside the computer.

8 Unplug the unit.

9 Verify the battery is good before replacing modules. A drained battery may be indicative of a crashed Power Management Unit. Does the battery measure at least +3.5v? If not, replace the battery and reset the PMU (see next step).

10. Reset PMU (see below). Refer to "Resetting the PMU on the Logic Board" mentioned earlier in this chapter.

11. Remove the rear housing.

Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury:

  • Review the CRT safety information on Service Source online.
  • Discharge the CRT
  • Never use a grounding wriststrap until after discharging the CRT and setting up an ongoing ground connection.

12. Check the power button cable. Is it routed as shown below? This is correct.

  1. Make certain the power button cable is tucked under the metal tab and the black mark on the cable is lined up with the chassis as shown below.
  2. Make certain the power button cable is tucked under the metal tab and the black mark on the cable is lined up with the chassis as shown below.
  1. Check the power button. Attach a known good power button to the unit. Do you have power now? If yes, replace the power button. If no, go to the next step.
  2. Unplug the unit. Warning: Make sure the ground screw (see below) is attached to the frame when testing power. Go on to the next step.
  3. Unplug the unit. Warning: Make sure the ground screw (see below) is attached to the frame when testing power. Go on to the next step.

Do you have power now? If yes, test the unit and

17. Unplug the computer. Check the fuse (see graphic below).You will need an Ohm meter to do a continuity test on the fuse. Using an ohm meter, touch the red and black probes to the two metal points at location F901 and check for continuity (reading of "0"). If the ohm meter registers "0", the fuse is good. If the meter registers "infinite", the display/analog assembly should be replaced.

  1. Unplug the computer and disconnect the AC connector.
  2. Plug the computer back in. Make sure that the AC connector is disconnected, and that the ground screw is attached before proceeding to the next step.

20. Check for AC voltage. Touch the red probe to the contact for the blue wire, and the black probe to ground or the contact to the brown wire of the AC connector. Do you measure 120V (line voltage)? If yes, go on to the next step. If no, replace the fan assembly.

  1. With the computer unplugged, reconnect the AC connector.
  2. Plug the computer back in. Locate the pins on the down converter shown below.

23. Check for down converter "On" voltage. With the black probe grounded, touch the red probe of your meter to pin 3 and then to pin 4 shown below. Did you measure 4.33v on each pin? If yes, go to the next step. If no:

  • Replace the display/analog assembly if you measured 0v.
  • If you measured greater than 0v, but less than 4.33v, go to step 23.
  1. Turn the computer on. The voltage at pins 3 and 4 of the down converter should jump to +20.3v. Measure the voltage at pins 3 and 4. Did you measure +20.3v? If yes, replace the logic board. If no, go to the next step.
  2. With the computer unplugged, remove the digital assembly (see Take Apart chapter).
  3. Reinstall the fan assembly. Remember to connect the AC cable connector and the ground wire. Plug the computer back in and go on to the next step.
  4. Reinstall the fan assembly. Remember to connect the AC cable connector and the ground wire. Plug the computer back in and go on to the next step.

27. Locate the blind mate connector. Note: You may need a slim or pointed probe to measure voltages. With your black probe grounded, touch the red probe to pins 7 and 8, on the blind mate connector (bottom row of pins). Pins 7 and 8 should read 12.25v.

Fan Blind Mate Connector
  1. Did you measure the correct voltages at the blind mate connector? If yes, replace the logic board. If no, replace the display/analog assembly.
  2. If the issue persists after the logic board replacement, replace the Down Converter board.
DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

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