Hello Friends, hope you are doing well!
Your Toshiba Satellite A75 has a failed power and you are unable to start the laptop then follow these steps to start.
The power supply is bad
The computer will run on battery power but will not charge the battery if the power supply is bad. Try using a different power supply to check this problem. If the problem still persists then your DC-in board could be bad.
DC in-board is bad
If your DC in-board is bad then the laptop will also not run using the power adapter and neither your battery will charge. Your DC-in board needs to be replaced if your laptop still does not turn on with a new power supply.
Hard Drive Cable is loose
You may not be able to boot properly if your hard drive cable is not fully plugged in the laptop. Try to unplug the hard drive cable and then plug it in by making sure that it is fully seated in the hard drive.
The computer will try to turn on but will then immediately shut off if the memory in the computer is bad. First, take the memory out and reseat it after cleaning the contacts. The memory needs to be replaced if this does not fix the problem.
If you have replaced the system board twice then this probably does not apply to you, however, we have seen many Toshiba Laptops with the same or similar motherboard where the power jack on the board becomes disconnected or loose. You need to obtain a new jack and solder it back into the position.
If you have brought used or refurbished boards then it could cause a difficult jack problem. You may require a special cold soldering technique as it is awkward to access, however, when done properly by an experienced technician you can save your laptop.
There are also several Sony laptops and Dell Inspirons with a similar problem.
The costs for this repair are very costly but the parts are very cheap so we don't know how to justify their high cost.
We would like to share with you some tips for repairing the Toshiba A75 laptop for the DC Jack and battery charge problem.
If you are having a Toshiba A75-S209 for a year now and after the first 3 months it developed the exact same problem. Your battery is not charging and you have to twist and turn the power jack to make the connection. Since it was in warranty you returned it and the technicians repaired it. However, your problem once again recurred after about 4 months and you sent it again for repairing and it worked fine for 5 more months, and then again it failed. This problem is caused by your Toshiba laptop due to a design flaw. Now that your laptop is out of warranty you decided to repair it yourself. Your guide for dismantling A75 was awesome. By resoldering the power jack with a new one it will solve your problem for a while but it will again reoccur. Hence we have decided to bring out a wire with the Jack outside. It looks dirty however, it is a permanent solution. Insulate the DC jack with electrical insulation tape. If it works fine then connect and disconnect on the dangling power jack that is outside the laptop and hence there is no chance of breaking the soldering from outside.
You need to coil the pair of wires one around the other through the ventilation grill. This prevents any force or external shock or force from being directly transmitted to the soldering joints.
You also need to connect a new DC Jack to another end of the wire. If you have purchased the new DC jack which is above the white wire in the positive terminal (+) and hence must be connected to the inner ring of the DC Jack. Similarly, the blue wire being the negative terminal (-) should be connected to the outer ring of the DC jack. As the leads are very close be careful not to short them.
Then neatly wind a round of insulation tape over the wire and especially on the exposed DC Jack exterior which will prevent any short-circuit and also give it a better appearance.
The workaround done around the power jack relocates the jack externally. It may happen that a shorting would occur between the metal casings on the top cover (the one which is removed with the guitar pick). This happens due to the solder repair being too tall. You should cover the repair with electrical insulation tape and then fixed the problem.
We hope this blog will be helpful for Toshiba laptop users who face the problem of their Toshiba Satellite A75 failed power jack workaround.