EEVblog1460 - REPAIRING a LED Studio Light with a DUMPSTER LAPTOP!

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Dave repairs his failed Aputure Amaran HR672C LED studio light by salvaging a part from a dumpster laptop!
Why is this LED light mysteriously killing batteries and falsely indicating charging when no batteries are installed?

00:00 - Aputure Amaran HR672C FAIL
04:00 - Teardown
06:30 - Under the microscope
11:30 - Measurements
13:41 - Charger schematic
15:56 - Analysis
16:40 - More measurements on the likely culprit
17:08 - Bingo!
19:07 - Another fault?!
19:27 - Let's salvage the replacement part from a dumpster laptop!
21:42 - Suck it off and repair
22:27 - Winner Winner Chicken Dinner

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#ElectronicsCreators #Repair #Dumpster

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Are you sure those "dead" batteries haven't just gone into undervoltage shut-off ( assuming they have protection circuitry) ?

mikeselectricstuff

Likely those old dead Infolithium batteries can be recovered, simply by applying a current limited 8V supply to them, and leaving on for a day or two, till the tiny charge flowing through the battery management chip finally charges the cells past the undervoltage lock out point, or you have to open the case, and charge the 2 cells up to around 3V, which should start the controller again. I remember those do not have kill fuses in them, just a thermal fuse for flame prevention, and a controller that handles the 2 cells. Have repacked them, was not going to pay Sony prices for the pack, which was down to around 100mAh capacity by then, basically take a single photo and then recharge, which ironically was the maximum number of images the one 8M memory stick could contain. Yes I actually got a 8M memory stick with the camera, so Sony could say they gave a card with the camera. 8 images at 640x480

SeanBZA

Great video Dave and great to see the process of fault finding - and repair. (Cool as an ice-cold stubby, Go Straya) And this is a perfect example of fixing something with a 50c part - rather than ending up in landfill. Cheers mate.

muzzaball

This is what we love about Mr Dave Jones, good work as always thank you.

cutterscut

Nice work! Nothing beats a repair video. I really like the idea of bringing things back to life.

bertblankenstein

Really enjoyed seeing the mighty dave working on the same type of chineseium goods as i often do ...
my eyes were glued all through

yanfishtwig

9:00 - Interesting that they place a 3-conductor device into an 8-conductor package to make it more 'surface-mount friendly'!

dhpbear

The charging circuitry makes sense; if you had them wired in parallel and you connected two battery packs of different SoC, huge currents, potentially dangerous, would flow. If you put two packs with different SoCs in series and charged them in series you could greatly overcharge one pack, obviously this depends on the protection circuitry in the batterys, but you don't want to rely on whatever dodgy battery people stick in there.
Using a single 2S charger and alternating the packs being charged means both packs will always be charged correctly to 8.4v without balancing, no "hot" connectors on the outside and less risk of damage to equiptment.

bgdwiepp

Thank you for the video. It appears to be a common issue with HR672. I have experienced the same problem with one of mine. Cannot wait to try & test that mosfet & replace if need be! - Thanks again.

marioscicluna

Consonance makes very good Lithium charging ICs. Their LiFePO4 modules are very good, and they also have switchmode devices that are a similar price but better performance than the Linear TP4056 and similar clones.
They wouldn't put the (removeable) batteries in parallel because there is a high likelihood that the voltages would be mis-matched when plugged. That would cause massive current to flow between the packs, with potential Kaboom!
So, by running them in series they then use the Micro to switch the lower battery to the charge circuit first, and then once they are matched they would switch over to a 50:50 switching between them.
Also, if in series it would be extremely difficult to balance them properly, since each Sony battery is stand-alone unit. It can be quite messy to configure separate charging chips on a series string, and what if only one battery pack was inserted?
So the easiest solution is to just do voltage sensing using the Micro and connect the charger IC to whichever pack requires it most using the "H-bridge of Mosfets".

johncoops

This demonstrates the need for keeping what the wife loves to call junk!
The dopamine hit received when you source a part from said junk and actually fix what you needed is akin to having sex in some cases LoL 🤣.

PeterMilanovski

I guess they went for charging the packs separate is that else the cells would/could get very imbalanced if you would put in an empty and a full pack.. (and they are off brand without protection ) This way at least the 2cell pack is charged as equal as they can try to do.

vBunny

*Points at CPU* "That must be the nVidia co processor".... Erm....
However, it's nice to see techtubers doing as I usually do at work regarding replacing MOSFETS with ones recovered from Scraptops.
I even pick up schematics where I can get them freely and boardviews if needed so I can score capacitors from old scraptops.
Better reducing my e-waste footprint by a grain of sand than to waste tonnes of CO2 over a couple grains of sand and I enjoy seeing others do the same.

dedrm

Yep. I have some high end bicycle lights that work like this. MC driving some mosfets. I've had to shelve them because it's to complex to just replace the batteries and get them together again.

cspower

Hi, Dave. In the video you mentioned how one pair of wires has a diode bodged in across its contacts, while the other doesn't. And later on you mention how the two MOSFETs differ in that one has ESD protection (an extra diode) and the other does not.

I think these two are related. I think that the factory ran out of the ESD-protected MOSFETs and therefore substituted the non-protected one. And then bodged-in a diode in order to replace the missing functionality.

Does sound like a plausible explanation to you?

Shamino