At work, we have a 1905FP dell 19" LCD monitor (from '05) that stopped turning on. We have a history of just buying new monitors and throwing the old ones out, so since I've been here I've rescued one. I ended up just buying a replacement PSU board for one monitor rather than replace caps as I hadn't done much since H/S with the soldering iron and it still was half the price of a new monitor (it was a 22" ws and replacement board was $70). I should've just bought caps and done it, but I figured that was easier and cheaper than buying a new one.
ANYWAY, I opened the dell 1905FP up and pulled out the PSU board. I noticed two CapXon 10V 1000uF capacitors, bulging with leaked, dried electrolyte coming out the top. OBVIOUSLY bad. The others are fine, and there is one other one of the same size and rating that has not gone bad. I checked out the specs on CapXon's site for the KF capacitors and found this:
-40-105C; 1.04A RC; 76mOhms Imp;
I also found a table that gives a "multiplier for ripple current vs. Frequency" and for 120Hz it lists 0.72 as the multiplier. I have no idea what that means. I just took one course on E&M in college, so I def don't remember this.
I looked at Digi-Key for caps, and I found these:
Panasonic-ECG
Nichicon
United Chemi-Con
Which ones should I choose, and should I replace the other caps as well. It looks like they're all from CapXon which seems to be a rather shitty manufacturer. Also, what type of solder should I use? Maybe a rookie question, but I noticed radio shack had two different kinds. I will be buying an iron for this job, and thought I'd get it there.
Lastly, the manufacturer placed some type of heat paste on the MOSFETs' (I think that's what they are) heat sinks that are then screwed tightly into the back of the monitor. I'm guessing they're trying to transfer the heat to the entire back of the monitor. Anyway, should I replace that paste as well, or just leave what's there, there and call it good?
Thanks for the help all!
ANYWAY, I opened the dell 1905FP up and pulled out the PSU board. I noticed two CapXon 10V 1000uF capacitors, bulging with leaked, dried electrolyte coming out the top. OBVIOUSLY bad. The others are fine, and there is one other one of the same size and rating that has not gone bad. I checked out the specs on CapXon's site for the KF capacitors and found this:
-40-105C; 1.04A RC; 76mOhms Imp;
I also found a table that gives a "multiplier for ripple current vs. Frequency" and for 120Hz it lists 0.72 as the multiplier. I have no idea what that means. I just took one course on E&M in college, so I def don't remember this.
I looked at Digi-Key for caps, and I found these:
Panasonic-ECG
Nichicon
United Chemi-Con
Which ones should I choose, and should I replace the other caps as well. It looks like they're all from CapXon which seems to be a rather shitty manufacturer. Also, what type of solder should I use? Maybe a rookie question, but I noticed radio shack had two different kinds. I will be buying an iron for this job, and thought I'd get it there.
Lastly, the manufacturer placed some type of heat paste on the MOSFETs' (I think that's what they are) heat sinks that are then screwed tightly into the back of the monitor. I'm guessing they're trying to transfer the heat to the entire back of the monitor. Anyway, should I replace that paste as well, or just leave what's there, there and call it good?
Thanks for the help all!
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