Printable version in PDF format is available here: [RS Guide] - So Your Transformer Won't Charge and/or Boot? Printable Version

Disclaimer on general charging behavior:
The Eee Pad series tablet charging system uses 15 VDC at 1.2 Amps to charge. This is NOT the same as any USB port out there. Attempting to charge via USB will NOT show the unit is charging, and it will yield a very slow charge only when the screen is off. Typical charge rates:
Asus Wall Wart (15 VDC @ 1.2 Amps): Charge rate of ~35% per hour with screen off. Will charge with the screen on and indicate charging.
Typical USB Port (5 VDC @ 0.5 Amps): Charge rate of ~3% per hour with screen off. Will NOT charge with the screen on. Will NOT indicate it is charging.
iPad Wall Wart (5 VDC @ 2.0 Amps): Charge rate of ~10% per hour with screen off. Will NOT charge with the screen on. Will NOT indicate it is charging.

Dock battery charging behavior:
TF101 - Dock battery is used first. Tablet will not charge until battery is below 90% in the tablet. Dock will stop discharging (and will leech off the tablet battery) at 3%.

TF201/300/700 - Tablet battery will be used until tablet reaches 70% power. Then the dock will recharge the tablet to 90% and return to using the tablet battery. Dock will stop discharging (and leech off the tablet battery) at 3%.

So, your TF screen is blank and pressing the PWR/LOCK button for 3 seconds to turn it on is not working.
Or you think the battery is dead and is not charging even though you are trying to charge it.

First we should do a visual inspection of the cables, connectors and ports.


There are some wall wart adapters that allow the USB cable to be inserted wrong way round. Look at the photograph above. Plugging in the cable wrong way round can potentially short circuit the charger, and obviously will not provide any charge to the TF. Be sure to check that the pins inside the cable connector and the charger socket are lining up with each other.
Please note that the positioning of the USB symbols on the Charger and on the Cable is actually confusing.



Notice the location and position of the actual connecting pins on the charger in the following photo:


Secondly, it is important to inspect the health of your 30 pin connectors. The dock has 2 – one that takes in the charger cable and other that connects to the tablet when it is docked and then the tablet has one on the bottom. It has been noticed that the aluminium is very thin around the charger ports and may bend easily around both the female charging ports. If this gets bent, it could damage the mating connectors on the dock or the charger cable.

The last one to check is the charger cable itself. Be sure that nothing looks damaged or broken or that there are no cuts or frays along the cord itself. If in doubt, it is better not to use any USB extension cables at all – just use the cable that came with the TF.

If you have any damage to the cord or connectors that could be the cause of the problems and the issue should be fixed by repair or replacement.

Next we need to ensure that the TF has some charge.

Before we do that, we should test out the charger.
If you have the TF dock, plug the TF dock (or dock+tablet) into the stock wall charger using the supplied USB cord. The LED light adjacent to the charging port should become amber and may flash depending on the charge level. If the dock is fully charged, the light glows green.

If not, use another USB device (phone, USB light, flash drive with a light) and see if the light on the USB device comes on, or that it is indeed charging. If it does not respond to the USB device, there may be an issue with the wall charger. Note that you would have to use the connecting cable that actually belongs to that device and you should not use the TF Charger Cable.

You can connect the Tablet to a PC’s USB port – but the USB port on PC is designed to supply 5V whereas a working Asus Charger supplies up to 11V when it detects Asus supplied TF cable being connected to it. So even though you can use a USB port on a PC to revive a Tablet, it would take a long long time and you should have the tablet screen off for it to work at all. Remember it may take a very very long time to charge the tablet this way.

We also need to make sure that you are docking the Tablet and the Keyboard Dock correctly as you are likely to charge both of them at the same time while they are docked and an improperly docked tablet would not get properly connected to the port and hence would not get charged.

Carefully study the picture below for a proper way to dock the tablet.


Please note that often the Tablet itself may indicate that it is docked even when it is not properly docked – hence the above visual guide is the only reliable way to verify. This happens because the software running on the TF is looking for a connection between a few pins – but it cannot detect if all other pins are actually connected or not.

Another point to note is that as soon as the tablet senses a charger being connected, it actually starts up by powering itself On. But if you are trying to re-charge the batteries as quickly as possible, you would want the tablet to remain Off. You can do this by following a specific sequence even during routine usage of the TF.

Connect the charger and start charging, your TF may turn itself On even if it was in shutdown condition – if it does that it would be a good idea to shut it down again and leave it on charge to complete the charging process. It is to be noted that during the charging process, if the charging process itself is interrupted due to power failure or something similar, when power returns and charging starts again, the TF would again turn itself On – so if a low battery was your problem and you are trying to charge the batteries as quickly as possible, you may have to keep a constant eye on the TF, if you are likely to have power interruptions.

Here are a few tricks to try to make the charger work:

First Suggestion
The wall wart adapter can come apart into 2 pieces in addition to the charging cable. We will need to separate these two pieces. On the side with the wall plug, there is a tiny arrow on one side that shows which direction to slide the plug to take it apart. Here is an image of the arrow location on a charger:


And here is the charger taken apart:


The 2 pins on the larger piece need to be bent outward very slightly from the center. They should still line up with the holes, but just a slight tweak will help.


Also, bend them slightly away from the surface behind the pins. We are talking very minor tweaks, maybe of a mm or so.


Next, we need to re-assemble the two pieces. Very gently assemble them. If it feels like the two pieces are not fitting together, perhaps the tweaks were too extreme. If this is the case, adjust the prongs so it fits together nicely. It does take a little bit of force to snap in the last mm or so.
Test it and see if it will work with the TF and /or a USB device.

Second Suggestion
No luck? We have another fix for you. Try using a small screwdriver or a paperclip to try to ever so slightly bend these two pins inward in the USB connector so they make better contact. The idea here is to push the metal shield of the USB connector on the cable to so that the actual connectors press against the corresponding connectors on the charger and tighten up any loose connections.


Test it again with both a USB device and/or the TF.

Third Suggestion
Still not working? One last trick up our sleeve is to take the wall wart charger and seal it in a dry Ziploc bag and toss it in the freezer for 20-30 minutes. Then remove it and leave it in the plastic bag for about 30 minutes to make sure condensation does not build up inside the charger.
There is a overheat trip relay switch inside the charger which may have tripped due to overheating and when the charger reaches subzero temperatures it would hopefully move back as it is a thermo mechanical electric relay.
Test it again with both a USB device and/or the TF.

Last Resort
If none of those works, there is a good chance your charger is defective. If the USB device is working and the TF won’t charge, there is a chance that the TF charger cable is defective, damaged or not working. If you have a friend or relative with a TF charger, you can try to borrow theirs to see if it works. If not, you may need to buy a new charger from a retailer such as Best Buy, ExcaliberPC.com, TigerDirect.com (CompUSA Stores), Office Depot, Amazon, Caseen, ASUS or somewhere else that you can find the charger.

We have proven the wall charger works, we will need to move on to the next step of getting a charge into the TF:
Plug the tablet only in to the stock charger for no less than 1 hour. Under normal circumstances, this should turn the TF on at some point once the battery has a charge in it.
If this did not work, then plug the tablet only into a USB port on a PC or a USB charger for no less than 3 hours. This should give it just enough charge to switch the Tablet on – but you may not get much longer usage.

Is your Transformer still dead?
Unplug your TF from the charging cable.

Try the following Hard Reset procedure: (will not wipe data)

Try holding the VOL DOWN and then hold the PWR/LOCK button at the same time for no less than 12 seconds. The TF should show some signs of life.

If that did not work, one last trick is to hold only the PWR/LOCK button for at least 30 seconds. This would reset the TF if by any chance it had gone into what is known as NVFlash mode. Still nothing? Try a 3 second press and release on the PWR/LOCK.

With any luck you should have a TF that is now booting up. If not, there is a chance that your TF may need to be returned to the retailer for replacement or to ASUS for repair.

One last item to mention: it is also possible that the PWR/LOCK button is not properly aligned or is stuck and could be causing issues, but that fix will be covered in another RS guide. The fix for that is a DIY solution that involves opening up the TF and can be risky.

Many thanks to the users of this forum for their contributions. Wall Wart charging troubleshooting borrowed from moose from this thread.

Printable version in PDF format is available here: [RS Guide] - So Your Transformer Won't Charge and/or Boot? Printable Version

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