Suggested by John Firestone,instead of conventional solder..
You can also use silver-filled, conductive epoxy to mount SMT LEDs It won't melt anything, but is a little expensive and has a limited shelf life (refrigeration extends it). It can also make some stubborn shorts if you are sloppy.
Two 7-10 minute ones are CircuitWorks CW2400 and MG Chemicals 8331 (both around $30-35). CircuitWorks also offers a 60-minute epoxy, CW2460, which is less common and more expensive.
I have never used the stuff so i wouldnt know where to start but many thanks for the suggestion!!
The Clock........
This thing was a pain in the backside as i bought the wrong size SMD LEDS (Surface Mount) and all i had to hand was a soldering iron with a 15mm flat tip.. You would be wise to use at least 0805 SMD LEDs i used 0603 SMD LEDs. I would think 1206 SMDs would be ok, A decent point tipped soldering iron (SMALL!) NO COFFEE/RED BULL/MONSTER etc etc... NO CAFFEINE! Im pretty hardcore when it comes to caffeine.but i had a coffee and i have never shaken so much!
Right,start off by removing the clock.If you dont know how then either remove the head unit or carefully pry it out with a flat screwdriver. Once removed undo the 4 clips from around it and take the back off...
there will be 4 clips holding the circuit board in,carefully bend the clips on one side and pull the board out.When you do that make sure you leave the clock facing down so you dont lose parts!
Once that is all done look on the other side of the circuit board,there are 4 LEDs,carefully unsolder(RED DOTS) and remove these.(GREEN DOTS)
After that you need to solder the new SMD's on.These are polarity based!!!! Test which side is the + (positive) with a small battery or a multimeter.Mine had a triangle under the led and the flat edge of it was the positive. When you solder them on the positive is the TOP of the board... once you have all 4 on you are nearly there!!
Using a flat screwdriver again gently pry the white clips and pull the plastic bit out BE VERY CAREFUL! THERE IS A LITTLE RUBBER WEDGE AT THE BOTTOM OF THIS CLIP,LOSE THIS OR PUT IT IN WRONG AND YOUR CLOCK WONT DISPLAY!
There is a little piece of orange plastic under the clip,i cut a piece of plain paper the same size and put it in place of the orange piece.
Carefully put it all back together and plug it in,YOUR DONE! If all went well it will work and you will have replaced the SMD's in your clock! Also be careful not to bang the LCD Display, i did and the ink has run.
New clock on the way but the beauty is you can just put the circuit board in the new one! Hopefully this has helped someone as ive been typing for ages!!
Coming soon....... Window controls!