All photos were overexposed. I suspected, that the exposure metering unit has been damaged. After disassembling the camera, I have found this:
(it was not separated in this manner, but it was no more on its normal position on the transparent base. The sensor is pressed down by a metal clip, but in the same time held in place with to drops of glue. The glue has been cracked.)
The lens has to project the image on the matte on the matrix made of the exposure measuring sensors. A small projector. This is the sensor matrix:
If it is not centered, the measuring will be of course false. The problem was, that the glue has been broken – so, how to get the right position?!?!?
Fortunately, on the surface of the transparent plastic remained a mark from the old glue.
Red arrow the mark, blue arrow the glue itself (you can put them together, they will fit).
I positioned the sensor in the right position under a microscope, and then I applied two drops of my favorite Loctite 3090 glue (2 component cyanacrilic adhesive – hardening in 5 minutes…)
And the camera works perfect!
DIGITAL CANON repair blog 
thank you very much for this instruction! just repaired my 60d and it works perfectly!
A few questions… if you cannot find the 100% adjusted Point… your metering will Show false values. To get this part new and aligned is impossible. To find a complete part – including the viewfinder prism block from a used cam will be sometimes more easy. But Then? Has the new meter to be adjusted over the Software? Without having one will be the only Option to go to a repair shop….
Tom, you are right, but:
…in the most cases people (I think, 95% of the photographers) never use the spot metering – and for averedge metering will be OK. Case not – you have to go to a workshop, which has the software. I have such a software, the SPT, but only for the 5d, 7d, 5d2 and 40d.
The problem is, that if you go to an official workshop, that they have to replace the whole mirror box (because the exposure meter is factory aligned), you will have to pay more, the value of the camera.
So, in life You have to make some compromises too 🙂
Man you are my savoir! I have just rebuilt my 60D with broken mirrors (both!?!) that wrecked shutter flaps and ended between, shutter flaps and sensor in two pieces 😦 (thanks god sensor has only minor coating deffect).
After assemblying camera back using whole new central frame with shutter assembly and mirror box there is no red dots highlighting focus points and all photos taken by viewfinder are at least +2 EV overexposed and even uncorrectly focused. Pictures taken in LV mode are perfect.
But sadly I have no glue leftovers on the mounting points and I did broke back cover flex cable while disassemblying the thing fifth time so I have to wait for spare parts from china before solving this problem.
Your blog is absolutely treasure chest for DIYers!
thanks
Better use gloss acrylic varnish.
which make exactly? take a photo
I think it does – but in this case it was no danger. I have seen the foggy coating in case of mounting a lens in a plastic tube, but I could clean it easily.
Does that Loctite cause fogging on the near by surfaces while curing, like other cyanoacrylate glues does?