Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
I'm most interested if anyone has any comments on my post above.
Ian...
Batz
Senior Member
Last Activity: 07-09-2012, 05:33 AM
Joined: 03-26-2012
Location: Edinburgh
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
OK, that's good. I'll check....Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
Yes, cross post confused things. I have the broken monitor (the original in this thread) and the recent purchase from eBay which allegedly had a yellow line on it at some point. It is working fine right now and I was only mentioning that in case it would be possible for me to swap useful bits from the broken one in the case that the yellow line ever came back....Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
Sorry cross post, my reply #90 was to post #88.
In reply to Selldoor:
I am not keen to do all the same measuring again as it takes time and I don't think we are learning anything new. If there are specific items that should be measured I can do those if it is going to be valuable.
In terms of the overall status that's very easy to describe as it has never changed from the first day it failed.
The PC was on and the screen went dead. The power light went...Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
OK, that sounds good. Any chance the broken board can be fixed has it reached it's conclusion?Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
Hi All
I am just posting back here to say that my monitor is still in bits and I am wondering what to do with it.
I managed to get an identical model off eBay, it's a 2009 model so a bit older and was sold as 'not working' although after asking the seller it was listed as such just because it once showed a yellow line down the left hand side. It corrected itself and it has not appeared since. I now have it installed and it has been working perfectly.
So I am just...Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
I've just tested and all the components starting with FR or F are measuring zero ohms.
I connected the two large boards but not the screen,the little controls PCB or the connector to the USB ports.
I measured the pins for each of the connectors as follows:
Connector near F851 and F852
1 = 770mV
2 = 770mV
3 = 770mV
4, 5 & 6 = soldered in a lump to GND
7 = cycling 0 to 1.7V
8 = cycling 0 to -33mV
9...Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
I was usually measuring either side of a particular component as directed by previous posters. I took my time to make sure I was getting a solid contact with the solder or the leg of the component and retook the readings to make sure they came out the same.Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
That's what I thought!! I tested it on some batteries this morning and the multimeter is fine.
So assuming some of those 'cycling' voltages are not accurate they at least indicate that the voltages on those points are not as they should be. Can anything be deduced from this? Is there anything else that I can measure?Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
Hi all, sorry for the delay have been very busy home and work. I have done some testing and here are the results to as many of the previous voltage measurements as I could find.
First I tested the fuses and fuse resistors and they all seem fine (continuous)
These are all with the power supplied to only the main board, everything else disconnected.
AC Input voltage 243V
Big Capacitor = 330V
+24V marked on back of the board = approx 30mV
+5V marked...Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
OK will do, busy weekend so will come back ASAP....Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
Where have all the helpful people gone who posted earlier in the thread? I am reluctant to give up on this monitor but I am clueless to diagnose what might be wrong with it.
Even if someone could review my IC soldering attempt it would be better than silence ...
Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
By the way you can see on the pictures that I managed to damage the track to component C953.
I don't think the track is broken just the surface protection damaged when solder dropped on to it.Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
Here are some pictures of my IC soldering!
Hope someone can come back on this thread with some suggestions of what I can do next.
Ian...Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
Hello again all!
The five ICs arrived today and this evening I have carefully soldered one of them onto the PCB ... the screen is still dead ... argh!
I measured the resistance across pin 4 & 6 of one of the ICs that I didn't use and it measured around 406kohm. I measured across the same pins on the IC that I soldered on the board and it initially measures high like 1Mohm but then drops down to around the same figure of 401kohm. Is this perhaps because the power supplied...Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
Thanks Selldoor.
I have bought 5 of the LD7575 chips from this vendor:
[url]http://www.ebay.co.uk/itm/280760599946?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2648[/url]
Virtually the cheapest and it looked like the most professional of the cheap far east listings.
I'll post back when they arrive.
Thanks again everyone for contributing to helping me in this thread.
IanRe: Dell 2209W - no power at all - stripped down butLeave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
@selldoor - can you post the CPC item details so someone can check it out? I'd be happy to set up an account with them as long as it was easy/cheap enough.Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
I am happy to check anything else before I order. I guess the link for 5 is the best bet but if we were confident it wouldn't blow again then this one is in the UK and just as cheap:
[url]http://www.ebay.co.uk/itm/LD7575PS-LD7575-SOP8-Green-Mode-PWM-Controller-Power-supply-controller-chip-/270917789107?pt=LH_DefaultDomain_3&hash=item3f13f565b3#ht_1042wt_1415[/url]
Is it OK?Re: Dell 2209W - no power at all - s... <br /> I amLeave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
Sorry for the delay, I just got time to do this. I have removed the IC using the 'flood all the pins' technique, not too tricky.
The measurement on the IC between pin 4 and 6 is 6.4ohms.
The measurement on the board pads between pin 4 and 6 is 1Mohms - the same as when the probes are apart.
Do I go ahead and order a replacement IC? If so are there any specific ones recommended?Leave a comment:
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Re: Dell 2209W - no power at all - stripped down but can't see anything obvious
OK, seems like the best plan is to remove the IC and test it.Leave a comment:
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