If the wood there is not sound then you are likely looking forward to some more serious repair such as replacement of the jamb side board or the whole jamb.
Repair split wood door frame.
Apply carpenter s glue to broken wood pieces and glue them back onto the jamb.
Most medium to large repairs will require at least two layers of filler.
Carefully remove broken split pieces of wood from bottom of the side jamb.
Dianaa76 question 2 years ago on step 1.
The resin is just a filler not a form of strengthening which was required in your above posting.
Fixing a split door frame.
Unscrew and remove the old metal storm door frame from the doorway opening.
If the split is quite big use wood glue and a clamp to hold the frame in place.
Press the form against the filler and attach it with screws.
Quickly learn how to repair a rotten door frame with miracle bond repair epoxy.
A split can occur in a variety of.
For a more serious split you may be able to glue and clamp the door.
How to fix a door that cracked where the hinges go 1.
Or you can wait until the sagging filler reaches the hardness of soap and carve it off with a putty knife or chisel or shape it with a surform plane or rasp photo 2.
Be sure your door can fully close.
You can then paint or varnish the area afterwards.
Remove the door stop and molding.
Hold scrap wood.
Since you say that the wood under the hinge and around the hinge screw holes has split and gone soft it pays to check the wood of the door jamb adjacent to the hinge mount location as well.
At this point you may need to decide if you will be happy with the patched up door frame when you are done.
The easiest way to fix a broken door frame is remove the metal door catch strike and or dead bolt catch strike.
Pull off any small splinters.
If the split in your door frame is very small you can simply use wood putty to fill the crack.
Fixing a warped door frame.
Whatever the reason a split or cracked door frame needs to be repaired as soon as possible to avoid security issues.
Insert the tip of a putty knife into the cracks to clean out chips or splinters that might cause the cracks to fail.
Remove the door from the jamb using a drill driver.
Once the glue dries you can use wood putty or wood filler to even out the surface and then finish with paint or varnish.
Take the trim off the door on both sides using a flat pry bar.
Use wood putty to fill the crack and paint or varnish the door as needed.
Clamping the timber with a wood glue is a better solution as it will be stronger and not split the same way again.
Place the door across two sawhorses.
Then pull it off after the filler hardens.
Scrape away any small chunks of wood that may be protruding from the door frame.
Identify where the damage is located.
How to repair a door frame method 1 of 4.
How to repair a rotten wood door frame using miracle bond epoxy.
Add some door shims behind the damaged area to support it.
If not remove any wood that is preventing the door from closing.