Member Avatar for seh57

I have a Compaq Presario v2000, sn CNF55116NW , Model EP378UA#ABA. My AC adapter connector end, the end that connects to the PC, melted the yellow insert in the connector. I noticed that I can run the laptop with the battery out and the AC plugged in and there is very little heat. However if I put the battery back in and it begins to charge after about 15 or 20% of charging the end gets hot and after about 40 or 50% the end is extremely hot. I know that when the PC is in use and if the battery is charging and the PC is being used the AC adapter will heat up but to have the connector end to melt the yellow insert appears to be way too hot. When the battery reached full charge the connector cooled off but when I pulled the connector end out of the PC it was stuck, hence the melted insert. The battery ran the PC OK and the charge dissipated about 15% in about 20 to 25 minutes. Could my battery be bad or is it the motherboard?
Thanks Stan

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Melted plastic at the DC plug is a real hotspot symptom and a safety hazard. The key clue from — the plug stays cool with the battery removed but overheats while charging — points to the charging path (the jack/plug contact, the adapter tip, the battery pack, or the motherboard charging circuitry) rather than ordinary adapter heating under load. This narrows the investigation and changes priorities: don’t keep using the damaged connector.

Quick, non‑destructive checks to narrow the cause:

  • Power down, remove AC and battery, then inspect the jack and adapter tip for blackening, deformation or looseness. Do not force a stuck plug.
  • With a multimeter measure the adapter DC voltage unloaded, then measure at the jack while connected (battery removed). A large voltage drop under load or an intermittent reading indicates a poor contact or failing adapter.
  • If possible, try a known‑good, compatible adapter (same voltage/polarity) and/or a known‑good battery to see which component carries the overheating. If heat appears only when the battery is present, the battery or the board charging circuit is suspect.

Repair/next steps and cautions:

  • Worn/bent center pins, loose jack solder pads, or damaged PCB pads usually require replacing the DC jack assembly or reflowing solder; board‑level charging faults need professional diagnosis.
  • Use OEM or reputable replacement parts and confirm voltage and polarity before connecting. Disconnect the battery and AC before any solder work and use proper ESD and soldering technique; if not confident, have a technician do the repair to avoid further motherboard damage.

’s experience (jack replacement) is a common outcome, but confirm with the multimeter tests first to avoid unnecessary parts swaps.

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Member Avatar for caperjack

I have a Compaq Presario v2000, sn CNF55116NW , Model EP378UA#ABA. My AC adapter connector end, the end that connects to the PC, melted the yellow insert in the connector. I noticed that I can run the laptop with the battery out and the AC plugged in and there is very little heat. However if I put the battery back in and it begins to charge after about 15 or 20% of charging the end gets hot and after about 40 or 50% the end is extremely hot. I know that when the PC is in use and if the battery is charging and the PC is being used the AC adapter will heat up but to have the connector end to melt the yellow insert appears to be way too hot. When the battery reached full charge the connector cooled off but when I pulled the connector end out of the PC it was stuck, hence the melted insert. The battery ran the PC OK and the charge dissipated about 15% in about 20 to 25 minutes. Could my battery be bad or is it the motherboard?
Thanks Stan

hi, i also have a Compaq Presario v2000 and earlier this year it did the same thing ,actually it was my daughter who used the laptop at university ,and she used to jam the back of the laptop where the plug is against the back of her desk and she broke the power jack away from the motherboard ,so what i had to do way buy a power jack off E-Bay and have it soldered to the mother board .cost me about 10.00$ cdn for the jack and i took the laptop apart myself and had a friend solder it for me .computer repair shops will charge you dearly for this .if you continue to use it this way though you could eventually kill the motherboard /laptop

Edited by caperjack because: n/a
Member Avatar for seh57

hi, i also have a Compaq Presario v2000 and earlier this year it did the same thing ,actually it was my daughter who used the laptop at university ,and she used to jam the back of the laptop where the plug is against the back of her desk and she broke the power jack away from the motherboard ,so what i had to do way buy a power jack off E-Bay and have it soldered to the mother board .cost me about 10.00$ cdn for the jack and i took the laptop apart myself and had a friend solder it for me .computer repair shops will charge you dearly for this .if you continue to use it this way though you could eventually kill the motherboard /laptop

Thanks caperjack
I found that this is my case also and I will have to solder the jack back to the motherboard.
Stan

Member Avatar for caperjack

Thanks caperjack
I found that this is my case also and I will have to solder the jack back to the motherboard.
Stan

yes ,but check the center pin of the jack ,mine was burnt off ,so i replaced the jack, but when the guy soldered it for me noticed this it was after new one was installed ,he said he could have just re-soldered the pin

Member Avatar for seh57

yes ,but check the center pin of the jack ,mine was burnt off ,so i replaced the jack, but when the guy soldered it for me noticed this it was after new one was installed ,he said he could have just re-soldered the pin

Thanks I will look at the pin and see if it is damage again thanks for the info.
Stan

Member Avatar for caperjack

Thanks I will look at the pin and see if it is damage again thanks for the info.
Stan

your welcome ,good luck

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