Samsung SyncMaster 215TW crappy caps

[PCBONEZ]

Re: Samsung SyncMaster 215TW crappy caps

[/QUOTE]
Once again you rattle on, citing figures, and baseless speculation.[/QUOTE]
Not speculation. - Got math.

Define 'Markedly'. You love the term, please define it.

Fairly common English word.
They do have a number of dictionaries online but as noted several times now, you aren't much into reading.

Unless Panasonic has some secret ultra-low ESR series, FM is as good as they go.

FJ and FL have been around a LONG time, and they aren't a secret.

Next, what is going to be the consequence of using lower ESR caps?

As clearly shown, you easily exceed the max Ripple Current rating of the cap itself. When it degrades you are NOT going to have less Ripple.
The reading thing again.

As far as the cheap Chinese manufacturers following the same standards as the more reliable Japanese manufacturers, that's real funny.

Not even close to what I said.
The reading thing again.
.

[joedaddy277]

Re: Samsung SyncMaster 215TW crappy caps

PC time to update your profile. Something like , very grumpy,
extremely grumpy, exceedingly grumpy etc.

[PCBONEZ]

Re: Samsung SyncMaster 215TW crappy caps

There is nothing grumpy about math or information in manufacturer documentation.
.
There is something annoying about blanket statements as advice when those statements aren't in fact -always- true and the fact they aren't -always- true is readily verifiable through math and manufacturer documentation.
.

[Th3_uN1Qu3]

Re: Samsung SyncMaster 215TW crappy caps

Oh my. Wouldn't it be a good idea that our old and respected members also respect each other?

PS. @ PCBONEZ: Your ripple voltage/current calculations are wrong. Ripple voltage DECREASES when the capacitor has lower ESR. If it were the other way around, then power supplies wouldn't ever fail due to bad caps.
You are correct when it comes to the capacitor's rated working voltage - it is indeed the peak voltage, so that's including the ripple that remains superimposed over the DC. But in most cases the ripple is low enough that it can be ignored when selecting the cap's voltage rating. No one in their right mind uses a 16v cap on a 15v rail anyway.

Also, you again show that you do not understand inductors. If you use a capacitor with significantly lower ESR, the power supply will not pull a couple extra amps of ripple out of its hat! The ripple current that the capacitors have to eat, in any switchmode power supply, is dictated by the output inductor. Period. And in a flyback type supply the inductor is the transformer secondary.

[PlainBill]

Re: Samsung SyncMaster 215TW crappy caps

Oh my. Wouldn't it be a good idea that our old and respected members also respect each other?

Oh, but I do respect PCBONEZ. I do also feel he has the tendency to obsess over trivial details (or perhaps I should say 'details which are trivial in this context'. I would not suggest gross changes in capacitor ESR in (for example) a power supply for a pulsed megawatt laser).

In many ways, he reminds me of another fellow I know. JH was generous and helpful. He was also capable of fixating over trivialities. The most memorable was a pair of Timex digital watches he had bought on closeout. When he discovered that neither kept time to HIS standards (one gained a second a month, the other lost nearly two seconds a month), he spent days trying to find someone to adjust them. What made this more bizarre, JH was rarely on time. If he called to say he would be at my house within an hour, he seldom arrived in less than 2 hours.

PlainBill

[PCBONEZ]

Re: Samsung SyncMaster 215TW crappy caps

Oh my. Wouldn't it be a good idea that our old and respected members also respect each other?

Since when does respect imply or require agreement?
That sounds like one of those Communistic 'Social Justice' 'happy happy joy joy' attitudes.
If that's your speed then I think Mother Goose is still in print.

PS. @ PCBONEZ: Your ripple voltage/current calculations are wrong.

PS. @ Junior: You're wrong.
If the PSU has 80mV Ripple present on a scope w/o the filter when you add the filter it will go down on a scope BUT it's DUE TO the Ripple Current passing through the filter.
The exact purpose of those equations is to calculate the Ripple Current passing through components of the filter, and it was properly done.

Ripple voltage DECREASES when the capacitor has lower ESR.

Ripple voltage decreases when the capacitor has lower ESR - DUE TO INCREASED Ripple CURRENT through the cap.
When that current exceeds the rating of the cap that voltage decrease will be TEMPORARY because the cap will degrade - which causes ESR to go up.

The ripple current that the capacitors have to eat, in any switchmode power supply, is dictated by the output inductor. Period. And in a flyback type supply the inductor is the transformer secondary.

Wrong/Irrelevant. - Only true at the final OP of the filter.
Point of interest is INSIDE the filter, not final OP.
.

[PCBONEZ]

Re: Samsung SyncMaster 215TW crappy caps

Oh, but I do respect PCBONEZ. I do also feel he has the tendency to obsess over trivial details (or perhaps I should say 'details which are trivial in this context'. I would not suggest gross changes in capacitor ESR in (for example) a power supply for a pulsed megawatt laser).

In many ways, he reminds me of another fellow I know. JH was generous and helpful. He was also capable of fixating over trivialities. The most memorable was a pair of Timex digital watches he had bought on closeout. When he discovered that neither kept time to HIS standards (one gained a second a month, the other lost nearly two seconds a month), he spent days trying to find someone to adjust them. What made this more bizarre, JH was rarely on time. If he called to say he would be at my house within an hour, he seldom arrived in less than 2 hours.

PlainBill

Why thanks PlainBill.

Attention to detail is a desirable characteristic when you fix Nuclear Plants.
It's pretty much a public safety matter to get things exactly right the first time.

In many ways, you remind me of fellow I know too.
DH [I wonder if they're related.] missed all sorts of details when he worked on things but after many tries he did eventually get things fixed right.
Took him forever to finish a job though. Reworks don't save time over taking time to plan.
Fortunately he worked on cars and not NUC Plants so he only endangered a few people at a time, not like millions.

I threw away all my watches when I retired from the Navy.
And I'm always early, because I schedule time to handle 'details'.
The wife on the other hand has problems with that because any 'details' [such as traffic or the need to stop for gas] are 'trivial' in her mind, even though they have an extreme effect on the time to get somewhere.
[If a detail affects the outcome then it's not trivial.]
.

[jsog]

Re: Samsung SyncMaster 215TW crappy caps

There are numbers but no formulas in post #18. Could you show how the ripple current numbers were calculated?

[PCBONEZ]

Re: Samsung SyncMaster 215TW crappy caps

There are numbers but no formulas in post #18. Could you show how the ripple current numbers were calculated?

Go look up Ohm's Law.
Although it's actually impedance and not resistance the math works the same.
.

[TCKTMB]

Re: Samsung SyncMaster 215TW crappy caps

CapXcon 820uF 25v and 330uF 25V.

I just packed it and send it off for RMA since i still had a few months warranty.. heh i already pulled out the caps though..

But i got another one of these 215TW LCDs here and its making the same buzz noise, so its only a matter of time before it dies.

Use Rubycons, Topcat has them
25ZLK820M10X20
25ZLK330M8X16 or 25ZL330M10X12

[Th3_uN1Qu3]

Re: Samsung SyncMaster 215TW crappy caps

Use Rubycons, Topcat has them
25ZLK820M10X20
25ZLK330M8X16 or 25ZL330M10X12

Finally someone on topic.

I won't continue replying to PCBONEZ because we'd only end up polluting the topic uselessly, happened before and will happen again if i don't do anything about it. And funny, the only thing i have to do in this case is do nothing.

[smason]

Re: Samsung SyncMaster 215TW crappy caps

Well I'm glad we're keeing things civil. It's healthy to disagree, as long as it doesn't get out of hand.
I certainly respect both PB and PCB's opinions, though I do prefer one's attitude over the other's...

[PlainBill]

Re: Samsung SyncMaster 215TW crappy caps

Well I'm glad we're keeing things civil. It's healthy to disagree, as long as it doesn't get out of hand.
I certainly respect both PB and PCB's opinions, though I do prefer one's attitude over the other's...

Any time you deal with other people you will encounter those who rub you the wrong way. About 25 years ago I took a part time job working in a computer software / accessories store. In my regular job I was dealing with the same 20 people every day, with a few new ones every month. In the store I was dealing with the same three people every day, and more than 20 new people every day. This presented a major change, and it took a while to adjust.

A lot of the customers were just there to browse and pick up information, a few were there to to buy, but there was a very small subset who came in for only one reason - they wished to demonstrate how bright they were.

On one memorable occasion the subject was surge protectors. I suggested a mid-priced one that had superior protection specifications. Of course, Mr. Know-it-All wanted to argue, insisting the most expensive one was better. So rather than argue, I looked him in the eye, said "You are right, I am wrong" and turned to the next customer.

Or as my Grandma said "You catch more flies with honey than you do with vinegar." I didn't ask her why she wanted me to catch flies.

PlainBill