Battery will not charge, but will use AC when plugged into jack. Battery is known good.Suspect component adjacent to jack was damaged during repair. What are values of the ''RV'' components near it?

3 possibilities,AC adapter faulty,AC jack damaged or motherboard has died.If you had a battery that is charged testing for the motherboard and AC jack would be easy.1st thing I would do is take it to a shop and plug another AC adapter into it to troubleshoot for an adapter issue.And if your battery holds charge ask if they can charge it for you to check the other possibilities.Good Luck

Here below are possible causes and troubleshooting steps of laptop that can't power on, hope it may help:
Possible causes:

1. AC adapter failure.
2. Power jack failure.
3. Motherboard failure.

Possible troubleshooting steps and repair solutions:
1. Test your compaq tc4200 power supply with a digital multimeter. It's possible that you have a failed AC adapter. If you don't have a multimeter, test your laptop with another known good AC adapter.

2.It's possible that power jack (socket where you plug the AC adapter) is broken. Remove the motherboard and take a closer look at the power jack. In some cases you can fix the jack by resoldering it on the motherboard. In other cases you have to replace the jack with a new one. Using a multimeter, test if the power goes to the motherboard through the jack.

3. If replacing the AC power adapter and jack on the motherboard doesn't help, most likely you have a bad motherboard. Replace the motherboard.

Sounds like your cable/charger/ computer AC plug in had been pulled, damaged, or the transformer is going out. If you can lat you hands on a similar known good AC cord it would help you trouble shoot the problem, you could eliminate the cord and focus on the computer plug-in. The AC/Charger cord transforms AC to DC to charge you battery and and run you computer. Another cable has to have similar specs (output voltage) as to not damage the components. As to the " plugged in not charging sign appears...", Is the battery old, replacement, does it deplete after using?

first remove battery then use charger for 1 min

then attach battery then charge it if not

it is problem with *********** board

plese once check another adapter

Hi,

I see that when the Adapter is plugged-in on the Laptop it does not charge, Have you tried a different AC Adapter to see if this is an Adapter issue or if this will be a hardware issue.

This concern can be an Adapter issue try a known good AC Adapter to see if the laptop will Charge or not if still it does not remove the battery and try the Known good AC Adapter to see if the Laptop will power ON using the known good adapter if it does then the issue can be the Battery or the Charger Board in the laptop now use the Old AC Adapter and see if the Laptop will as well turn ON with out the Battery if it does then the issue is either the Battery on the laptop or the charger board on the Laptop.

I hope this helps.

I will suspect the battery first. I make sure the battery I reseat the battery, make sure the charger is well plugged in and no damage to the cable. The next step is that I would test with a known good battery and if the problem still persist test with a known good AC charger. If the battery and AC charger and its cable/cord are determined to be good I will be thinking of big/expensive issue with main board which may not worth the trouble if the laptop is relatively old like 2 years

Hello The mandatory requirements before you try anything else are the main battery must be installed, it must work correctly, and there must be nothing wrong with the AC adapter or it's connection to the laptop. -Your model is recent enough the main battery must be installed - it won't start up on the AC adapter alone. - The main battery must be capable of being charged up to at least a minimal capacity. - The main battery does not last forever. Typically it works as it should for a year or so then begins to deteriorate - by the second year it can't be charged to anywhere near it's rated capacity. It gets worse as time goes by. Older batteries often develop internal shorts that makes it impossible for them to produce the voltage they're supposed to produce (you can test for that with a volt meter), and they may get HOT when you attempt to charge them for a while, rather than a little warm, or they may never get warm at all. - If you haven't replaced it since the computer was new, this model is old enough the main battery should be replaced! There must be nothing wrong with the AC adapter or it's connection to the laptop - if there is, the main battery cannot be charged properly. A common thing people do when they unplug the AC adapter is to pull on the cord rather than the plug on the end of the cord as they are supposed to do. Doing that eventually damages the plug and/or the wiring near the plug, and over a longer period of time, doing that damages the jack in the laptop the plug plugs into. The jack in the laptop should move when you wiggle the plug in the jack. Most laptops have an led that lights up only when the AC adapter is plugged in, there's nothing wrong with the AC adapter or it's connection to the laptop, and the AC adapter is charging the battery. That led should come on at least briefly when you unplug the plug from the AC adapter, then plug it back into the laptop jack, even if the main battery is fully charged. The led should not blink on and off randomlyIwhen you wiggle the plug in the jack. If that led never comes on, there is something wrong with the AC adapter or it's connection to the laptop, or the main battery is shorted (check it's voltage). If that led never goes out even after a long time, the main battery is probably no good - replace the main battery. The plug on the AC adapter cord can be replaced, but if you damaged it by pulling on the cord you will probably continue to do that at least part of the time, so since a plug molded onto the cord stands up to abuse a lot longer than a replacement plug, it's often a better idea to replace the cord from the AC adapter to the laptop if it can be unplugged at the AC adapter (a laptop repair place may stock that), or if that can't be done or you can't find that part, replace the AC adapter. The jack on the laptop can usually be replaced but that requires taking apart the laptop and careful removal and replacement of the jack. A laptop repair place does that sort of thing frequently, and often have the more common jacks in stock, though they may have to order one. Hope this helps, if so do appreciate my effort by rating the solution Good Luck, Cmptrlink

if ur charger is ok then u have need to change ur motherboard

If issue occurs with a known good AC adapter then next is replace the motherboard. Around $150 on EBay

Sounds like a bad battery cause its not keeping a charge. Try a new or known good battery and see if it will charge and then unplug the ac adaptor to see if the laptop stays on.

If the laptop stays on with a different battery charged then your old battery is bad. If your laptop doesn't stay on with a known good or new charged battery without the ac adaptor hooked up then its a bad motherboard.