Phillips/Fluke PM2811 power source

[mrjoda]

Hello members,

i bought PM2811 for very reasonable price, so there are some photos. There is a small viciousness. Unit was bought from USA so it was set as 115V voltage. I quickly read this topick https://www.eevblog.com/forum/blog/eevblog-755-fluke-pm2812-psu-ebay-score/ and i set jumper to 220V position. I closed unit, power it up... blown both fuses, main circuit braker and every circuit breaker in series  

So what happened ? I take out power supply, checked all the components, all OK... then i saw it...

[mrjoda]

more photos

[3g57]

Hi all!

I see big interest from many members to Fluke/Philips  PM2811  PM2812  PM2813
So I'll show photos of some nodes and test points in calibration process.
You'll understand many thing by watching the photos.
I ready for answering for Your questions.

Best regards, Anatoliy

Adjustment Fotos







































PHOTOS OF MODULES:




















































Calibration procedure in attached PDF file.




PHILIPS 2813                                                PHILIPS 2813



















































I wish You a good repairs, 3G57

[mrjoda]

How my Phillips die

I have been charging 4pcs of 18650 as usual (4pcs TP4056 parallel) with PM2811. I have been checking a current whole time. Everything was normal. I went make some cofee and after while "there is something in the air", i ran to my room and room was full with smelly fume. I looked at the batteries and two of them were around 80°C degrees. So i took them on my balcony in case they want to catch a fire. Power supply was turn off so i knew there is a issue more than hot batteries. I opened the enclosure and i didn't saw any damage. There was a stinky brown liquid around input EMC filter and everithing was clear - capacitor in EMC filter goes to silicon heaven. So i carefully open it (with hammer and chisel of course) and i was correct.

But i have no idea what happened. Batteries have 4,02V so they are not shorted out. Why they went so hot ? Current limit was set to 4A and TP4056 for 1A.

[sleibson]

Anatoliy,

It seems you've made many mods to your PM2811. Have you documented them. The one I'm especially interested in is your replacement of the EL backlight with LEDs. I have yet to figure out how to safely unsnap the keyboard/display board from the plastic clips holding it in place.

Thanks,

--Steve

[tuanpq]

can you share the firmware?

[Roehrenonkel]

Hi,
 
can anyone share schematics of the power-modules (60V)?

Best regards

[pandrew]

There was a stinky brown liquid around input EMC filter and everithing was clear - capacitor in EMC filter goes to silicon heaven.

I think it is a very common failure that the old compact filtered power entry modules die on these power supplies. I had it happen on 3 of my devices. I have also seen the same happen in this video. At this point I recommend just replacing these on sight (and labeling the new ones with when they were replaced). Note that the "FN282-6-06" modules can still be ordered, one example is here, on TME

But i have no idea what happened. Batteries have 4,02V so they are not shorted out. Why they went so hot ? Current limit was set to 4A and TP4056 for 1A.

I don't know why your batteries were hot, I don't think the PM281x can operate in current sink mode (according to the documentation only PM283x can sink current), and I just did a couple measurements with the power supply off, and I only see kilo-ohms resistance across the outputs, that wouldn't be enough to heat up the batteries.

I think the batteries being hot is most likely unrelated. Were the batteries of good quality, and internal resistance still low? Were the batteries hot and the TP4056 cold? Or could it have been the TP4056 hot? What voltage did you use to supply the TP4056? Remember that the TP4056 has to dissipate any voltage difference between the battery and its supply voltage. So while you can feed it 8V according to its datasheet, if your battery is at 4.02V, and you charge at 1A, it will have to dissipate (8V-4.02V)*1A=3.98W and that would be too much for the tiny SOP-8 package.

Have you fixed you PM2811? Did it accumulate any other faults, than the filtered power entry module exploding?