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Re: Dell 1800fp
I'm not sure this is correct since i was getting wierd readings.
At first on the ic i was reading .40-.45 between 6 and 7 pin. When i rechecked it after the caps i got 11.45-12.08.
C924 showed 0v until i switched to 2000m from 20v and then showed 003.
C907 showed .55 average but jumped to 11.45-12.05.
All fluctuated or would continually drop when showing the lower numbers other than C924 which stayed the same.Comment
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Re: Dell 1800fp
Okay, we have 3 likely possibilities for your fluctuating voltage.
1) The startup cap C907 is bad. It doesn't have to bloat in order to be bad.
2) The SMPS IC is bad.
3) There is something shorted on the output side to cause the fluctuating voltage. I would suspect one or more of the three diodes on the secondary side. These 3 diodes are mounted on the aluminum heatsink and are likely marked with the letter Dxyz.
Test each one of these diodes with your multimeter on the diode test function. If the diode looks like this -><-, you should have 4 readings per diode. You don't have to remove the diodes in order to test them. If the readings look suspicious, then you will have to remove them and verify out of circuit.
Start with #3 first.--- begin sig file ---
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Re: Dell 1800fp
Lost me. On the heatsinks there is a q902 near the ice chip which i think is a transister. Directly across on the seperate sink is a d906 and d903 with >l< symbal.
Off the heat sink is a d901 and d902 near the ice chip. Also a d907 just below ic901 in the pic.They have a l< which is what i think the diode funtion on my meter is.
Do i still test with power? Sorry not sure how to do this.Attached FilesLast edited by junktv; 02-10-2012, 08:06 PM.Comment
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Re: Dell 1800fp
"Q" is a transistor. "D" is a diode. We only want to test the diodes.
Let's try this. On all the chips that have a "D", follow this procedure.
1) Set your multimeter on diode test.
2) Power off the TV and unplug it. Wait 5 minutes.
3) For a 2 pin diode, put your black probe on one end, red on the other. Record the reading. Now reverse the probes and record the reading.
4) For a 3 pin diode, number the pins 1, 2, and 3. It doesn't matter which side is 1.
pin 1 - black probe, pin 2 - red probe
pin 2 - black probe, pin 1 - red probe
pin 3 - black probe, pin 2 - red probe
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Re: Dell 1800fp
D907 = 095
D901 = 480
D902 = 507
D903 looking at bottom non power cord plug side and left to right.
1-2 = keeps climbing
2-1 = 180
3-2 = keeps climbing
2-3 = 180
1-3 = 001
D906
1-2 = climbs
2-1 = went from 102-104 after a couple seconds
3-2 = climbs
2-3 = started negative then 100 and slowly climbed and steadied at 104
1-3 = 001Comment
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Re: Dell 1800fp
If there are any ZD in the same area, they are zener diodes and should be tested as well.--- begin sig file ---
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Re: Dell 1800fp
Anyone have a suggestion for what series caps to use to replace these? I see they are all general but they use two different kinds so must be different specs. I was going to try and find them all in panasonic and i think Fc was a good general cap. Might order a ICE 2as01 also. Or do you think my problem is some where else on the PSU?
PSU
1x 50v 47uf sam young KMG
1x 10v 2200uf KMG
1x 25v 33uf samwha RG
1x 16v 1000uf RG
2x 10v 2200uf samwha RD
2x 16v 2200uf RD
Logic
1x 25v 470uf samwha RD
1x 25v 470uf sam young KMG
http://www.samyoung.co.kr/download/miniature/KMG.pdf
http://www.soselectronic.com/a_info/...e/a/pdf/RD.pdf
I have some extra 25v 470uf rubycon ZL if they will work for either of the 2 on the logic card.
http://www.rubycon.co.jp/en/catalog/...minum/e_zl.pdf
ThanksComment
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Re: Dell 1800fp
1) Did you change out D907? You said it had the same reading both ways.
2) If this monitor has been used 6 years 24/7, then
365 x 24 x 6 = 52560 hours.
Your ccfls are likely near end of life. From my research, they last anywhere from 40k to 60k. If this were my monitor, I would just replace the diode, and retest. If it works fine, leave the caps in and use the monitor until the ccfls start to die.Last edited by retiredcaps; 02-13-2012, 02:19 PM.--- begin sig file ---
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Re: Dell 1800fp
Ah i forgot to do that.
I'll get to it here in a few and report back.
True but i am hoping it works alot longer and only $10-15 in parts w/ shipping.
Good clear monitor and can run dual pc's.
EDIT: D907 is 638 and infinite.Last edited by junktv; 02-13-2012, 03:08 PM.Comment
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Re: Dell 1800fp
Can you recommend a good series match from panasonic for that cap and the others? I don't know how to figure out the ohm and ripple when they don't have it listed.
It's $5 shipping if i order one or all of them anyway and never hurts having extra parts laying around. Unless like now none are of the same values i happen to need other than a couple and they are low esr i think. Hopefully that fixes it ,the last PSU i worked on was two of the sink mounted resistors that was bad.Comment
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Re: Dell 1800fp
If there are no datasheets for the originals, I would just get Panasonic FR or FM as the first choice (either is fine). If the values don't exist for those 2 series, then choose Panasonic FC.
The SMPS IC is only available on ebay.
http://www.ebay.com/sch/?LH_PrefLoc=1&_kw=ice2as01--- begin sig file ---
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Re: Dell 1800fp
Well i found a PDF for the samwha RG on this site.HERE
Seen the bottom number where it shows dimensions is the ripple so that helps.Comment
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Re: Dell 1800fp
Does this look like it will work? I wasn't sure what to get for the RG 25v 33uf. It looks like they have a series M, KG and GA that are in the specs that i could figure out. Would one work better than the other?
In my list the ones in brackets () are other series available. From column I left are the original specs.
RG datasheet
KMG
RDAttached FilesComment
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Re: Dell 1800fp
When ESR or impedance is not listed, it is a general purpose cap. The datasheet even says general purpose.
So you want ripple at least 75ma or more. I would get this Pansonic one (75ma)
http://search.digikey.com/us/en/prod...491-ND/2504580
The rest look okay.--- begin sig file ---
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