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Author Topic: mppt repair?  (Read 2537 times)
eabadger
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« on: May 11, 2017, 06:23:49 PM »

ok, to carry on from another thread, i had an ms mppt controller fiz and bang when i clicked save on network settings.
so ms accepted issue was theirs and are sending a new one out.
they have given me the faulty one so i have opened it up to see if repairable, but there may be trouble ahead............

taking a part is a doddle, just undo all the visible screws, hardest part is a very brittle plastic support from the white lower casing of the unit to the bottom pcb, guess how i know it is brittle?
after this two more plastic pcb separator to prize apart, followed by two screws to get fet heatsink off.

first off before moving heatsink i could see a hole in a small 8 pin device, so not as lucky as tinbum, i have checked already the 3 diodes near the battery terminal, different part number to yours tinbum and all 3 are s/c
removing the heatsink i got to the fets, all of them very s/c along with some other diodes.
worse parts for destruction were when i lifted fets back and saw yet more carnage of surface mount diodes.
along with 3 transformers all other parts appear to be tripled, hence how i got part numbers

so parts list is, any help tracing bits i cant would be appreciated.

parts required for mppt repair

3 x irs s2181s   found on web

3 x bgt 51gsb   these are the 3 diodes near bat terminal, cant find

12 x irfb4321   fets found on web

3 x stps2017ct these are the 8 pin devices, only one gone but get 3 as boards has 3

6 x 6619 yp12 1529 diodes under fets can not find



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Sean
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« Reply #1 on: May 11, 2017, 07:19:02 PM »

Put it on eBay, spares or repairs - life is to short.
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Antman
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« Reply #2 on: May 11, 2017, 08:09:47 PM »

EAB
The fact they don't want it back for exchange repair tells you it's more trouble than it's worth to do so.
The diode code is probably the shortened numeric part of a full manufacturer's part code, plus batch code and date code, as there is not enough room to print it all - but to work out what it is without the schematic is difficult. The obvious guess 1N6619 is not an smt device AFAIK so that does not help - but you get the idea.

Sometimes semiconductor manufacurers will make a batch of a device - with a dedicated part code - for a particular manufacturer to use in a product. They are not on general issue to distributors so you are left looking for an equivalent - assuming you can find the original spec in the first place.

From experience, trying to repair pcbs like this is fraught with unseen problems. You could potentially replace all the components you see/measure as faulty and miss the fact that one of the transformers has a shorted turn which caused the fault in the first place. First time you power up, everything dies again the same way and you are back to square one having wsted time and money on components. Been down this road with UPSs and inverters. You really need the schematic as a minimum otherwise a waste of effort as Sean says.

Antman
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Scruff
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« Reply #3 on: May 11, 2017, 09:54:45 PM »

Sounds bad Steve,

7.50 + P&P final offer!  ralph

Have they all got blow holes? Are they short circuit or are they just on a parallel bus and something on the rail is short circuit. The best way is to remove them and then test them. You'll need a hot air station a board preheater, a set of electronic tweezers, flux, v. thin solder, a decent DMM preferably with needle probes and a current limited power suppiy for that job. The whole thing is covered in poxy conformal coating so there's no easy way in.


First time you power up, everything dies again the same way

This is why we use adjustable current limited supplies for diagnostics.
« Last Edit: May 11, 2017, 10:36:25 PM by Scruff » Logged
Scruff
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« Reply #4 on: May 11, 2017, 10:26:30 PM »

3 x bgt 51gsb   these are the 3 diodes near bat terminal, cant find
http://uk.farnell.com/littelfuse/smcj78ca/diode-tvs-78v-1-5kw-bi-5-smc/dp/1886372 (thank Tinbum)

3 x stps2017ct these are the 8 pin devices, only one gone but get 3 as boards has 3
http://uk.rs-online.com/web/p/products/8772977/?cm_mmc=UK-PPC-_-google-_-3_UK_EN_M_SEMIS_Broad-_-stmicroelectronics%257Crectifier_schottky_diodes&mkwid=spsg7HztS_dc%257Cpcrid%257C79005691995%257Cpkw%257C%252Bstps20170ct%257Cpmt%257Cb%257Cprd%257C&gclid=CMKj0Lfc6NMCFYK87QodUGME9g

Not 8 pin but possibly same with less legs.

6 x 6619 yp12 1529 diodes under fets can not find

http://www.digitroncorp.com/Products/Product-Line/Rectifiers/1N6619 ...maybe?

1529 = year 2015 week 29 (July-ish)
« Last Edit: May 11, 2017, 10:38:34 PM by Scruff » Logged
jonesy
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« Reply #5 on: May 11, 2017, 11:10:54 PM »

How have the TVS gone ? They will be protecting data lines.
Must have been one heck of a surge .  I'd guess there will be more non-obvious damage.

Time to revise your offer Scruff. It is a lovely case and heatsink though.

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Scruff
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« Reply #6 on: May 11, 2017, 11:17:18 PM »

I only need a FET that's "discontinued".  Wink

Wouldnay say no to a few beefy caps. There could just as easily be less wrong with it. If it costs two days to fix then arguably not worth the effort. Unless it's for education or entertainment.

« Last Edit: May 11, 2017, 11:20:26 PM by Scruff » Logged
Scruff
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« Reply #7 on: May 11, 2017, 11:32:31 PM »

If decide not to pursue Steve willya sawzall me out this cluster?  fingers crossed!



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Tinbum
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« Reply #8 on: May 11, 2017, 11:36:06 PM »

Sounds as if I was lucky with mine as it was only the 3 protection diodes. Hardest part was getting the conformal coating off.
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eabadger
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« Reply #9 on: May 12, 2017, 08:22:35 AM »

Hello All,
bit of background on me, i was apprenticed trained television engineer, mix of valve and transistor to start with, then mechanical video recorders followed by dvd and in the mix camcorders, final part smd nokia were the first i recall of this new tech, but i kept up with all, i then found a more lucrative job in industrial electronics repairs, lots of smd now, i do have in storage all my rework kit so should not be an issue in ability, except for, i partial lost my eyesight in one eye which effected my overall ability to do the job, we will see if 6 years off has improved it.

how cost effective is this, how cost effective is anything that any of us are doing on here? hobby? interest? education? all possible.
with tv's we restarted blown up repaired one's on a variac, so similar to using low voltage bench supply to simulate pv input when fixed.

should we not be promoting repair over landfill? after all this is a renewable forum and if you can diy?

i did see tinbums post, and saw the link to the diodes, just wondered why ms had changed them? i have a theory they may have caused the problem, or at least contributed to the destruction.

the 8 pin device nailed, http://www.infineon.com/dgdl/irs2181.pdf?fileId=5546d462533600a401535676c12b27d3

so scruff you had one die? those diodes are the same looking fellars as the ones under the fets


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* IMG_0848.JPG (94.26 KB, 640x480 - viewed 249 times.)
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Tinbum
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« Reply #10 on: May 12, 2017, 08:52:06 AM »



should we not be promoting repair over landfill? after all this is a renewable forum and if you can diy?

i did see tinbums post, and saw the link to the diodes, just wondered why ms had changed them? i have a theory they may have caused the problem, or at least contributed to the destruction.

I always try to repair stuff if I can and if not repairable at least i have learnt something.

I sent a photo to Farnell for them to identify the part- attached is the photo of mine. Its the BGT that's the important bit.


* diode.jpg (470.5 KB, 2560x1920 - viewed 239 times.)
« Last Edit: May 12, 2017, 08:56:17 AM by Tinbum » Logged

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Scruff
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« Reply #11 on: May 12, 2017, 10:21:56 AM »


so scruff you had one die? those diodes are the same looking fellars as the ones under the fets


Bought it broken to be specific.

http://uk.rs-online.com/web/p/mosfet-transistors/6886712/?searchTerm=irf6646&relevancy-data=636F3D3426696E3D4931384E4D616E506172744E756D626572266C753D656E266D6D3D6D61746368616C6C7061727469616C26706D3D5E5B5C707B4C7D5C707B4E647D2D2C2F255C2E5D2B2426706F3D3226736E3D592673743D4B4559574F52445F53494E474C455F414C5048415F4E554D455249432677633D424F5448267573743D69726636363436267374613D6972663636343626

Cost effective?  hysteria
...where's the craic in that?
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Scruff
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« Reply #12 on: May 12, 2017, 01:18:35 PM »

I always try to repair stuff if I can and if not repairable at least i have learnt something.

Clicky

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