Re: Dell 2709w No power



Thank you for your reply! This is sad to hear, but then I guess there is nothing to do about that...
This explains the lines on the screen, but DDC/CI not working seems a bit suspicious for me. I doubt it has anything to do with tab bonds making contact or not. But then who knows. I think I will just live with the lines and I don't use DDC/CI anyway At least now I know the electrolytics are good and the BGA should be fine for a few years at least....

Re: Dell 2709w No power

Hi guys!

I too have a 2709W with the following symptoms: Some (1-5 varying) vertical colour lines on each side of the screen that would go away after some time (10-25 minutes). The colour was a bit off too (rather warm, redish, purpleish).

I have reflowed the main chip using a sandwich maker and a hot air station with an IR thermometer. I have used lots of flux (even Louis Rossmann would approve) and could see flux squishing out from under the chip when touched with tweezers, so I am pretty sure the reflow was successful. I have...

Re: Cooler Master MWE Gold 650W (MPY-6501-AFAAG) randomly won't turn on

It took some time, but I have finally replaced the main cap. I could not find 420V high quality ones anywhere near me, so I went with a 450V 330uF Rubycon (105C of course). The size is 30x50 which fits just perfectly in every dimension, it seems the PSU was designed for this size but they cheaped out on it later...

So after replacing it, the PSU seems to work fine, it fired right up and seems stable under load (90W CPU + 180W GPU both under stress test). I have to knock on wood, but if only this...

Re: Cooler Master MWE Gold 650W (MPY-6501-AFAAG) randomly won't turn on



It will, don't worry
I just don't know which to choose. I cannot find an exact replacement, these are my options: 330uF 450V 105C Rubycon MXR or Nippon Chemi-Con KMH which are high quality and 450V rated, but slightly lower capacitance than the current 390uF(which is still not much in my opinion). Or I can go with 470uF, but from brands like Jamicon, Samwha or Elite. Jamicon is a no go, Elite is not total garbage afaik (but I am just replacing one, that didn't take the abuse), but I...

Re: Cooler Master MWE Gold 650W (MPY-6501-AFAAG) randomly won't turn on



Okay it is just getting more confusing. I did what you suggested: heated up the main cap to about 70C (guesstimate, I could touch it but it was hot). After that, the PSU works just fine. No matter how many times I switch it off or on at the back, it just works as it should.
I say, okay let it cool down and check again to see if it really is the cap. But no. Since that, the unit works just fine. It's the next day, I have switched it on-off about a hundred times and not once it produced...

Re: Cooler Master MWE Gold 650W (MPY-6501-AFAAG) randomly won't turn on

Hmm, so I guess it is not something we can fix easily...

Main cap is 390uF 400V Elite GM series (85C 2000hrs general purpose). When turned on, voltage is around 340V on it.
All other caps are Elite brand too, mostly EY series (105C 4-10000hrs "Low impedance, High ripple current"). From what I have read on forums, Elite is not very high quality, but not total garbage either. I have measured a few of them (with my cheap chinese LCR meter) and all of them seemed quite good, nothing...

Re: Cooler Master MWE Gold 650W (MPY-6501-AFAAG) randomly won't turn on



Thanks for the tip!
I've tried to replace them (1pc 47uf and 3pcs 100uf electrolytics) but with no luck :/

However I have observed an interesting "habit": When plugged in for the first time after a considerable amount of time (5-10 minutes at least) spent unplugged, it would work perfectly almost every time (turn on and off as supposed to, as many times as I try). But once I unplug it again, the same erratic behaviour again (no turn on at all, or turns on once...

Hello guys,

I have a problem with this PSU and need your help and knowledge. The unit will not turn on most of the time, but sometimes it does, and then it works fine. +5Vsb is always present, but grounding PS_ON nothing happens. Cycling the power switch (sometimes I can hear a spark pop from the switch) and it will start up after 3-10 cycles randomly, and then all voltages are fine. Remove PS_ON jumper and it won't turn on again until some power cycles. Sometimes it would just turn on for a sec, and then turn off immediately (relay clicks). It is the same as this video shows: ...

Re: New Members - please post your introductions here

Hello guys,

This is a nice forum, keep up the good work!

Cheers,
David