QUOTE(h4x0rm1k3 @ Sep 26 2012, 06:14 AM)
Thanks for the reply. I will definitely be taping the surrounding areas in the future as you say, it only takes a few seconds to do so! Anyway, any ideas on what setting I should use on my multi meter? (I know, sounding like a noob) I only really use it for pot tweaking and a couple of other things so from guides I already gained the info for the settings I needed. The meter I have is a fairly basic one that cost about £15 on ebay. It has the usual settings, like this if you can understand what I mean! ( V- with 3 dots underneath goes from 200m to just 600 near the off position, V wavy line 600&200, A- with 3 dots underneath again 200u to 200m, Lastly the ohms area has 200 to 2M. It also has the continuity, hfe & 10A positions)
I will try and transplant the working cap out as replacement and see how that goes. Apart from that I just need to know where to check/test and what settings to use to work out what may need replacing. I know that i'd be able to do it with the right knowledge but without that info i'm a bit lost!
Again, thanks for your reply and I hope to hear from you again with possibly a bit more info if you're able to provide it.
On the meter .... V- with dots volts DC. Wavy line - volts AC
On your particular problem: you want to use either Continuity or a low Resistance setting. Continuity is what I usually use. If yours has a beep feature with that - great.
You'll want to use the power pins on the PCB. Top row of pins should be Grounds - most of them. Put a negative probe there. Keep it there. Or find a ground area on the PCB.
Basically three power rails to the dvd drive. 3.3 , 5 and two 12 volt lines. Each at a turn. Place your positive probe on those pins. Start on one, move to the next.
If your meter gives a continual beep or shows perfect continuity from one volt source to ground - then you have a short in that voltage rail. Then you try to narrow it down to a component
Kind of hard writing how to do it. So much easier to show someone directly
Would almost guess you have a short in the 3.3 volt rail