Member Avatar for ndanger

I have a Presario 2100, and like everyone else, i have a power problem. Mine seems to be a bit different though. The ac light comes on and the battery charges fine until I press the start button. Then the light goes off imediately and the system boots and runs fine, but only runs on the battery power. When the battery is exausted it shuts down and recharges fully.
Any feedback would be greatly welcomed.
Thanks,
Ndanger

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  • 6 Years Discussion Span
  • Latest Post Latest Post by Supasmartguy

Dani AI

Generated

This thread shows a common Presario 2100 symptom (AC present until power-on, then the machine runs from battery). started the topic, later confirmed the same fault, and suggested resoldering the power connector. Below is a compact, practical diagnostic flow and safe-repair guidance to confirm the real cause before replacing parts.

  1. Verify the adapter and cable. Measure the adapter’s DC output with a multimeter (center pin to outer sleeve) and compare to the printed rating. Look for voltage drop or flicker when flexing the cable.
  2. Battery vs adapter test. With the battery removed, plug in the adapter and attempt to power on. If the system runs from adapter alone, the adapter is delivering power; if it will not, the DC-in path or adapter is suspect.
  3. Wiggle/flex check. With the adapter plugged in, gently move the barrel at the bay while watching the charge/AC LED and system behaviour. Intermittent loss points to a poor connection at the jack or cable.
  4. Confirm voltages at the board (only if comfortable and ESD-safe). Measure at the internal DC jack or battery connector while attempting to power on. If the adapter shows correct voltage at the barrel but not at the board, suspect a cracked solder joint, broken trace, or an inline fuse/component.
  5. Repair choices and cautions. If solder joints are cracked, a controlled reflow or resolder of the jack can restore the connection—use flux, a small iron tip, and avoid overheating pads. If the jack is on a cable assembly, replacing the assembly is safer. Do not attempt board work without ESD precautions and some soldering experience; lifted pads and damaged traces often require a pro.

Practical path: confirm adapter voltages, run the battery-removed test, do the wiggle check, then decide between replacing the adapter, replacing the jack/cable, or a careful resolder. When in doubt, professional board-level repair is preferable to repeated heat on fragile traces.

Member Avatar for zip031

Ndanger I have exactly the same problem. I know it is almost year since this thread was started but if you're still around and found a solution perhaps you could help me. For that matter I would appreciate help from anyone.

Tanks Zip031

Member Avatar for Supasmartguy

I have the same problem. Just resolder the power connector.Take it to a computer repair center and tell the to resolder the powerjack/power connector :) :p

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