Fan repair and component identification 1600A NH & FBH5AA FDMP & W10B 89F

[sn4k3]

Recently my PSU went bad and at the time being used it inject 52V to a 24V fan (9BMC24P2G001). As that fan cost some bucks i try to fix it.
I removed every resistor and diode to test them outside PCB circuit. So far i found the following problems:

• PWM fet shorted, the one that connects to PWM Pin cable - Replaced
• 220 Ohm resistor shorted on same fet line - Replaced
• Zenner diode open on latch pin - Replaced

MCU receive 5V at VCC and outputinputs 5V at GPIOs.
1.2V at each motor phase
20mA current draw - Same before bad parts replacement
0.6V at PWM pin, should be 24V

Now there are some components i still have to check, but the number lead me to no results of what IC is:

• 1600A NH
• FBH5AA FDMP (Not sure about last FDMP part - very fade)
• W10B 89F

Also if anyone have experience on that kind of repair, please advice

[coromonadalix]

Try to clean the pcb with acetone, it wouls surely help to remove all this gunk

In a vented area ...

[fzabkar]

TPN1600ANH, Toshiba, N-ch MOSFET, 100V, 36A, 13 mOhm Rdson, TSON-8:
https://toshiba.semicon-storage.com/info/docget.jsp?did=13538&prodName=TPN1600ANH

FDMC86139P, Fairchild, P-ch MOSFET, -100v, -15A, 67 mOhm Rdson, MLP 3.3 x 3.3:
pdf.datasheetcatalog.com/datasheet/fairchildsemiconductor/FDMC86139P.pdf

EW-106B, Asahi Kasei, Hall Effect IC, SOT89, marking W10B:
https://www.akm.com/akm/en/file/datasheet/EW-610B.pdf

[sn4k3]

Try to clean the pcb with acetone, it wouls surely help to remove all this gunk

In a vented area ...

Thanks for the tip, will do.

TPN1600ANH, Toshiba, N-ch MOSFET, 100V, 36A, 13 mOhm Rdson, TSON-8:
https://toshiba.semicon-storage.com/info/docget.jsp?did=13538&prodName=TPN1600ANH

FDMC86139P, Fairchild, P-ch MOSFET, -100v, -15A, 67 mOhm Rdson, MLP 3.3 x 3.3:
pdf.datasheetcatalog.com/datasheet/fairchildsemiconductor/FDMC86139P.pdf

EW-106B, Asahi Kasei, Hall Effect IC, SOT89, marking W10B:
https://www.akm.com/akm/en/file/datasheet/EW-610B.pdf

Thats awesome! Can i ask how you reach them?
EW-106B: VIN: 14V | VOUT = 5V, i guess they are ok

Meanwhile i have another component that lead me wrong to single zenner or transistor: 3H, what's those?

[fzabkar]

RB530XNTR, ROHM Semiconductor, 3 x Schottky Barrier Diodes, 30V, 100mA, marking 3H, SOT-363:
https://www.rohm.com/datasheet/RB530XN/rb530xntr-e


http://www.google.com/search?q=3h+filetype%3Apdf+diode
http://www.google.com/search?q=W10B+filetype%3Apdf
http://www.smdmark.com/en-US/search/code?id=w10b
http://search.datasheetcatalog.net/key/1600ANH
http://search.datasheetcatalog.net/key/139P

[sn4k3]

MCU is not ok    The 5Vs are inputs from Halls. Not outputing signals to gates nor detected by programmer.
Think that's the final step to put that working again.
Asked Sanyo for firmware, not much hopes but we never know without try. Fingers crossed

[fzabkar]

That's bad luck with the MCU. :-(  I doubt that Sanyo will help you.

[sn4k3]

That's bad luck with the MCU. :-(  I doubt that Sanyo will help you.

Me too, hope they reply at least.
In extreme case i can open the other good-state fan and dump firmware, compare, do meassures. But sacrifice one fan to save only one don't seens good to me, can't do it without melt the sealed axis, which have to be melted again to put in place. In best scenario i can try solder jump wires at MCU pins and dump it, but MCU stays under the motor coil, which have small space to run a iron. Remove MCU with hotair is possible, but plastic ABS and coil holder will not survive without a new face OR maybe warp tons of isolator arround...

[fzabkar]

It could be that the PIC has a security fuse which prevents code dumping.

[sn4k3]

It could be that the PIC has a security fuse which prevents code dumping.

Good call. This will end in buy another most likely.
This fan is well built, i have open other fans in past and circuits are much more simple with few components and single side PCB, this one have a more complex circuit. They have reverse current protection, sadly they don't have a overvoltage protection.

[sn4k3]

One represantive call me today, he start the conversation trying to sell the blower, confusing to me because i never mention i wan't to buy new ones, looked like a comercial call not a support call. Had to stop the guy talk and ask "IDs? what for? My email request was about a firmware file, if sanyo can provide it to perform a repair and recover a damaged fan", only after he said "Yes, Sanyo replied, he have it here, i'll read it for you, hold on"..."they said Sanyo can't provide the file and you have to replace the fans (buy new ones)".
So he promptly start asking for IDs and other stuff to place an order without ask if i want to, worse he never mention my request if i didn't ask for it, totally forgotten... Not against with sell, but starting the conversation by mention my email or provide a direct anwser first looks the correct way to deal with support and not otherwise, something like: "Hello, about your request .... Sanyo can't provide the firmware file and you have to replace the fans. If you want to, we can help you with the order process, do you like to start it?"

I was expecting this outcome, but not the way i got contacted.

My original email request:

Hello,

One batch of 9BMC24P2G001 fans were damaged due a suddenly power supply failure and it inject 52V instead of 24V, that killed the fans.
We were able to safe disassemble, identify the bad components and replace them, (a FET and resistor shorted at pwm pin and zenner were open at latch pin). Everything else is OK, tested outside PCB. But the MCU is also damaged, it's not outputting at ports and not recognized by the programmer.
We have PIC16F1823 on stock and can write the firmware, we kindly ask if possible, to Sanyo send the compiled firmware hex/bin so we can burn them and recover the fans. If a PCB schematic is available would be great, there's still one IC without any top markings that we can’t recognize and miss the test.

Best Regards

The fun part is i know if i send it back to warranty before open they would send me a new one. I like to keep honest with my principles i never do it, also because i'm a seller and i know how hard can be. But this kind of approachs and/or customer care say me the otherwise

[fzabkar]

Your experience with Sanyo is the usual case in the repair business. I recall that I once needed a replacement MCU for a swimming pool controller (not Sanyo) but was told that I had to buy the whole PCB. The MCU had a single non-functional I/O pin, so I could have dumped its firmware had its security fuse not been set.

[NiHaoMike]

Just replace the whole inverter board with a R/C ESC?

[sn4k3]

Your experience with Sanyo is the usual case in the repair business. I recall that I once needed a replacement MCU for a swimming pool controller (not Sanyo) but was told that I had to buy the whole PCB. The MCU had a single non-functional I/O pin, so I could have dumped its firmware had its security fuse not been set.

Yes i know, and was expecting that, they want profit. Give firmware to able to repair gives no profit to them. Like no over-voltage protection that can be easly applied gives no profit too. But is their product and they can keep things like that/private and ask to buy the whole device, theres no obligation (unfortunately because of e-waste). But as i said my problem was the wrong approach, where my ticket was tottaly forgotten in order to sell first...

Just replace the whole inverter board with a R/C ESC?

The PCB holds the insert and coil motor, if i remove theres no way to fix the axis and bearings. The solution would be with a compact circuit, open PCB continuty and implement it.
Do you have any example?

Was also possible to do a custom firmware, but no clue for it. Would require sacrifice a good fan first and learn about signals on MCU pins.

I think i can put fan working at max speed by short MCU pins that goes to gates to 5V, will do the test