Anyone repaired a hdmi cable?

Repairing a HDMI cable falls under the term "Field Termination".

Field termination is the kind of thing you can easily do with the likes of network cables , RS232 , and various other formats.

There are field termination kits available for HDMI , but they are extremely hit and miss , they have about a 50% success rate.

HDMI carries signals at up to 10.2Gbps , at those frequencies the exact length of the wires in each twisted pair , and also the exact geometry of the twists in each pair , is vitally important to the correct working of the cable.
This is why almost 100% of HDMI cables are made by precision machinery , such a connection wouldnt be as successful as it is without todays automated manufacturing techniques!

So , best advice , simply replace the cable. Repairing it is highly unlikely to work.

Note that for long runs HDMI cables themselves become notoriously unreliable after 10 meters.

There are HDMI units using a Transmitter and receiver box and two runs of CAT5/6 cable that are much better in terms of reliability over long runs.

http://www.amazon.co.uk/Neet%C2%AE-Extender-Cat5e-network-cable/dp/B002ECYEYA/ref=sr_1_sc_1?ie=UTF8&qid=1335905908&sr=8-1-spell

Note that CAT5/6 cables can be bought pre made to specific lengths and is very cheap , alternatively , with a crimper , a roll of cable , and some connectors , they are childsplay to make yourself.