Dell P2210f no power

[offs3l]

Re: Dell P2210f no power

Hi

I have the same problem. Should I open a new thread?

In my case I changed D881 because it was bad but that didn't solve my problem. I have 0 volts after C889 and I850. Does it mean that one or both of them are bad?

I attach an image to clarify

[Per Hansson]

Re: Dell P2210f no power

Your photos are not usable, here is what I used instead: https://www.badcaps.net/forum/showpo...3&postcount=30

I made one omission in my previous post: 12v does not seem to be for that connector (CN851), it is for the DC jack at the bottom.
So you have that, and then +16v for the backlight driver (not easily accessible, can measure at J2 or R871 on side facing PCB edge).
The 5v is then accessible on the bottom 4x pins where the one red wire is (very strange color coding!) and ground is the two pins above that.
All the rest are for various signals like On/Off control, backlight control, audio detection on/off etc.
Note that diodes D854 & D855 that you are changing only supply the +16v for the backlight, it is separate from the other voltages!

[jrcollins]

Re: Dell P2210f no power

As for the schematic it seems a bit of the right of the paper got cut off when it was produced.
But it can be inferred that you should have a +16v for the backlight, and then +12v and +5v for the logic on that connector.

I was going to start another thread but seeing as you have already addressed this question, I was hoping you might be able to offer some clarification.

Do you know which wires I need to test for the 12v and 5v you mention in your reply?

Sorry for the poor quality of the photos.

[jrcollins]

Re: Dell P2210f no power

Yes, I try to avoid those websites too whenever possible. Thanks for your help.

[Per Hansson]

Re: Dell P2210f no power

I would not buy from that seller because he mixed up the type of diode in the title of the AD vs the description!
"Ultra Fast Recovery Diode" vs "Standard General Purpose"
-Typical Chinese crap, basically you can never trust to buy semiconductors from eBay or Aliexpress and other such sources.

I realized I made a mistake on Jaycar: I didn't see there where multiple pages to view because of their weird page layout, so here is one that should work great:
https://www.jaycar.com.au/diode-fr60...ck-10/p/ZR1054

As for the schematic it seems a bit of the right of the paper got cut off when it was produced.
But it can be inferred that you should have a +16v for the backlight, and then +12v and +5v for the logic on that connector.

[jrcollins]

Re: Dell P2210f no power

In the original post of this thread you can find the service manual:
https://www.badcaps.net/forum/showthread.php?t=48690

I would replace both diodes with a matched pair of ultrafast diodes with a voltage rating of at least 400v and 5A because that is what is in the schematic. (SF50-04)
Ultrafast diodes are required because this diode sits on the secondary of a high frequency switching transformer, unfortunately Jaycar only seems to stock a 1A ultrafast diode.
Note that it is not good design practice to put two diodes in parallel:
One will always be slightly different than the other so it will conduct more and eventually fail, this is the reason for replacing both as a matched pair.
Even better would be to just leave out one of the diodes and use a higher rated single diode as replacement.
It is interesting to note that the schematic seems to show this, because D854 is listed as "NC" implying "no connect" as a possibility:

What about this one? https://www.ebay.com.au/itm/23460226...cAAOSw5cpit78s

[jrcollins]

Re: Dell P2210f no power

I was hoping to find the output power voltages on the 12 pin connector (CN851) but it doesn't seem to be in the manual.

[jrcollins]

Re: Dell P2210f no power

Thanks for that. Are you are able to give me a link to the schematic?

Sorry, I see you already posted the link.

[jrcollins]

Re: Dell P2210f no power

In the original post of this thread you can find the service manual:
https://www.badcaps.net/forum/showthread.php?t=48690

I would replace both diodes with a matched pair of ultrafast diodes with a voltage rating of at least 400v and 5A because that is what is in the schematic. (SF50-04)
Ultrafast diodes are required because this diode sits on the secondary of a high frequency switching transformer, unfortunately Jaycar only seems to stock a 1A ultrafast diode.
Note that it is not good design practice to put two diodes in parallel:
One will always be slightly different than the other so it will conduct more and eventually fail, this is the reason for replacing both as a matched pair.
Even better would be to just leave out one of the diodes and use a higher rated single diode as replacement.
It is interesting to note that the schematic seems to show this, because D854 is listed as "NC" implying "no connect" as a possibility:

Thanks for that. Are you are able to give me a link to the schematic?

[Per Hansson]

Re: Dell P2210f no power

In the original post of this thread you can find the service manual:
https://www.badcaps.net/forum/showthread.php?t=48690

I would replace both diodes with a matched pair of ultrafast diodes with a voltage rating of at least 400v and 5A because that is what is in the schematic. (SF50-04)
Ultrafast diodes are required because this diode sits on the secondary of a high frequency switching transformer, unfortunately Jaycar only seems to stock a 1A ultrafast diode.
Note that it is not good design practice to put two diodes in parallel:
One will always be slightly different than the other so it will conduct more and eventually fail, this is the reason for replacing both as a matched pair.
Even better would be to just leave out one of the diodes and use a higher rated single diode as replacement.
It is interesting to note that the schematic seems to show this, because D854 is listed as "NC" implying "no connect" as a possibility:

[jrcollins]

Re: Dell P2210f no power

I've got the same problem here. One of the diodes was faulty. Could I use this diode as a replacement? https://www.jaycar.co.nz/diode-6a4-4...ck-10/p/ZR1044.

[SkullKill]

Re: Dell P2210f no power

My Dell P2210F blue power light kept tuning on and off in a loop.

Just wanted to say thank you. this thread helped me pinpoint what was wrong with mine.


removed both D855 and D854 and tested off circuit since they are in parallel.

D854 was bad in mine.

replaced with a HER605 diode (400V 6A) since that was the closest that was available locally for pickup at Altronics.

https://www.altronics.com.au/p/z0120...silicon-diode/

Screen is back up and running fine now.

[Leanoric]

Re: Dell P2210f no power

Hi,

as I found this thread googling around for the same problem and nobody seems to have documented a fix, here's mine:

I had the same dead power supply and found that one of the big SR520 diodes was shorted. All caps looked fine in my case as well.

It seems to be insanely difficult to come by new SR520 diodes. Due to incorrect data sheets online (essentially copied SB520 data sheets), I figured it was a 5A 20V diode when it seems that it is in fact 200V. So I ended up buying SB560 (5A, 60V) as a replacement. This did NOT work.
I then went for a MUR420 "ultrafast diode" as a replacement - as suggested in another forum. Even though it is only specified at 4A instead of 5A, it seems to work well so far. As far as I can tell it is very unlikely that the diode actually has to support 5A in the first place: It is located on one of at least two secondary rails and the whole screen does not use as much power as this diode is designed for. If anyone has a different opinion about that I'm interested in hearing it, though.

Anyway, I hope this helps the next person coming along with the same (apparently quite common) problem.

Thank you it did. Just hope it's not 'masking' another problem? Will see how long solution lasts, hopefully, won't be a problem in future.

[Leanoric]

Re: Dell P2210f no power

On both boards I have replaced D855 and D854 with the MUR420 and now the displays work again! (And thus confirming with two more repairs)

Same here, with two Dell 2210f monitors. One monitor working fine. The other found to be faulty LCD panel - turns off after 2secs when power applied. Swapped the panels and found fault lies with panel. Both Power boards, with same repair, now fully working. Played all night on Neverwinter Online with my new HD monitor! Well chuffed. Thanks for this solution guys. Now just need to view more YouTube vids about repairing t-con boards for panels.

[Leanoric]

Re: Dell P2210f no power

Same with my dead Dell P2210F; blows one of the parallel configured diodes D855 or D854. One of them goes s/c. Replaced twice with SB type. Now will try with suggested MUR420 type - ordered on EBay. Will post results. (Not expecting to work, problem may be elsewhere, but worth a try?)

[vhartong]

Re: Dell P2210f no power

On both boards I have replaced D855 and D854 with the MUR420 and now the displays work again! (And thus confirming with two more repairs)

[vhartong]

Re: Dell P2210f no power

Hi,

as I found this thread googling around for the same problem and nobody seems to have documented a fix, here's mine:

I had the same dead power supply and found that one of the big SR520 diodes was shorted. All caps looked fine in my case as well.

It seems to be insanely difficult to come by new SR520 diodes. Due to incorrect data sheets online (essentially copied SB520 data sheets), I figured it was a 5A 20V diode when it seems that it is in fact 200V. So I ended up buying SB560 (5A, 60V) as a replacement. This did NOT work.
I then went for a MUR420 "ultrafast diode" as a replacement - as suggested in another forum. Even though it is only specified at 4A instead of 5A, it seems to work well so far. As far as I can tell it is very unlikely that the diode actually has to support 5A in the first place: It is located on one of at least two secondary rails and the whole screen does not use as much power as this diode is designed for. If anyone has a different opinion about that I'm interested in hearing it, though.

Anyway, I hope this helps the next person coming along with the same (apparently quite common) problem.

Just aquired two broken 2210f monitor (and time to look at it). All caps also looked fine and indeed it was the SR520 diode that is broken. I can confirm this for two boards now (with one it was D855 and the other D854). Will try the fix as soon as I have the new parts.
Thanks for the post after 5 years!

[mde_]

Re: Dell P2210f no power

Hi,

as I found this thread googling around for the same problem and nobody seems to have documented a fix, here's mine:

I had the same dead power supply and found that one of the big SR520 diodes was shorted. All caps looked fine in my case as well.

It seems to be insanely difficult to come by new SR520 diodes. Due to incorrect data sheets online (essentially copied SB520 data sheets), I figured it was a 5A 20V diode when it seems that it is in fact 200V. So I ended up buying SB560 (5A, 60V) as a replacement. This did NOT work.
I then went for a MUR420 "ultrafast diode" as a replacement - as suggested in another forum. Even though it is only specified at 4A instead of 5A, it seems to work well so far. As far as I can tell it is very unlikely that the diode actually has to support 5A in the first place: It is located on one of at least two secondary rails and the whole screen does not use as much power as this diode is designed for. If anyone has a different opinion about that I'm interested in hearing it, though.

Anyway, I hope this helps the next person coming along with the same (apparently quite common) problem.

[lexwalker]

Re: Dell P2210f no power

Im having the same exact problem, did you find a solution for this problem?

Did you try checking the easiest components to diagnose? Check the fuses, thermistor and diodes first. Discharge the big main capacitor first before checking! Use the continuity test on the multimeter to diagnose these components. You can use the same continuity test to quick check the capacitors for ability to charge (again, discharge the capacitors first before using this test).

Attach the IP (inverter and power supply) board to the mains power. Check for any voltages on the secondary side (one of them should be +5V while the other should be +12V or greater), then check the voltage across the big main capacitor on the primary side (should measure anywhere from +168V to +350V depending on your mains voltage).

Warning! Please put the board on a piece of insulator (e.g. cardboard, thick plastic, etc) and avoid the direct contact with the primary section while the board is connected to the mains power. Just becareful!

[hano009]

Re: Dell P2210f no power

Im having the same exact problem, did you find a solution for this problem?