Shorted out my charger. (Supermate DC6)

[Skedgy Sky]

I went to charge one of my LiPo packs and accidentally hooked the 6 cell charger up incorrectly.

The charger became unresponsive (screen "frozen"), I restarted it, and then only got a green blank screen.
I opened it up and found:



Anyone have any ideas on what I can do to fix this?
Maybe getting some replacement component online (searching for "P047H B9E7_F7413Z" doesn't bring up anything) or pulling it out of something else I have lying around the house?

I have that Thunder 1220 charger coming in soon, but it would be nice to get this one working again.

 

[dnmun]

looks like an 8 pin voltage regulator.

 

[EL2T]

This one maybe?
/Lasse

http://pdf1.alldatasheet.com/datasheet-pdf/view/183157/IRF/IRF7413ZUPBF.html

 

[Skedgy Sky]

I'm no expert at this but my search has now lead me here.

https://ec.irf.com/v6/en/US/adirect/ir?cmd=catSearchFrame&domSendTo=byID&domProductQueryName=IRF7413Z

Searching google images for those 5 product names in the link above to see if any of them match the one I need to replace hasn't brought back any matches. I'm still pretty lost; will any of the 5 in the link above work?

 

[Skedgy Sky]

I was looking at the site I listed and found shipping to be around $12 just to order one of those small components... so I think buying a replacement is not an option... unless there's a cheaper place to buy it from.


What if I replaced the damaged one with the other one I have circled in blue here?

...and then for the one I remove, I directly fill the gap across the ground contact and the contact where the 3 pins off of the chip are. (the ground voltage and voltage on the other side of the chip where the 3 contacts are is the same).

...and for the one pin on the upper right of the chip, maybe I could use resistors to bring the voltage down to what it is right now at that contact? (0.262 V)

 

[Electroddy]

http://www.digikey.com/product-detail/en/IRF7413ZTRPBF/IRF7413ZPBFCT-ND/827868 This is a MOSFET DIGIKEY has them $1.34ea. If you place a phone order you can usually get them to ship in a small envelope. USPS First Class mail.

 

[circuit]

Does it power up if you short those mosfets?
If not, you have a problem there.

 

[dnmun]

that is not a mosfet, it is a voltage regulator for the ICs. it may be 4V. the turnigy wattmeter has one just like it. go look. i bet you can find the 4V regulators on ebay. but whatta i know.

 

[circuit]

It has too much of bonding wires for low powered voltage regulator, don't you think?
Manufacturer of this part is International Rectifier. Go to www.ir.com and look up N-fets in so-8 package. Take a look at their pinout. 4th pin is gate.

 

[Skedgy Sky]

You guys are confusing me as to what this chip is. haha :?
International Rectifier has expensive shipping prices, I won't be buying a $1 part for $13 from there.


It's cheaper for digi-key and part number looks similar enough so I might give that a shot.
http://www.digikey.com/product-detail/en/IRF7413ZTRPBF/IRF7413ZPBFCT-ND/827868

 

[dnmun]

it is not a mosfet.

 

[circuit]

it is not a mosfet.

I just had to quote this and add that, for the remaining guys to see it clear:

 

[dnmun]

follow the traces. one side is on the positive input the other side appears to be ground. the lead that comes off of pin #4 by itself goes where?

 

[circuit]

follow the traces. one side is on the positive input the other side appears to be ground. the lead that comes off of pin #4 by itself goes where?

Does not appear as ground to me.

 

[dnmun]

so what. if the OP checks continuity between the pads and ground and + then it might make more sense. having a mosfet right on the input does not make sense to me.

 

[Skedgy Sky]

that is not a mosfet, it is a voltage regulator for the ICs. it may be 4V. the turnigy wattmeter has one just like it. go look. i bet you can find the 4V regulators on ebay. but whatta i know.

This is the only one I found in my turnigy wattmeter; it doesn't look like the one I'm trying to replace.



Anyway, I placed an order for this one:
http://www.digikey.com/product-detail/en/IRF7413ZTRPBF/IRF7413ZPBFCT-ND/827868

I'll see if it works when it arrives. :wink:

 

[dnmun]

that 8 pin IC is not on the input + power lead. if you look for the one on the input power lead, you will see the regulated voltage trace running over to the ICs that drive the display and logic. that one you pictured is not the voltage regulator.

why not just measure continuity from the pads to the + input and ground and see if the legs are connected between + and ground? that will tell you if it is a mosfet or voltage regulator.

 

[Skedgy Sky]

why not just measure continuity from the pads to the + input and ground and see if the legs are connected between + and ground? that will tell you if it is a mosfet or voltage regulator.

Errrr, if I understood that correctly then: I get nothing for the continuity test.

 

[dnmun]

so neither pad is connected to the red input terminal? or the other one connected to the black ground terminal?

 

[Skedgy Sky]

Yea... nothing...

(besides some large values that keep changing if I measure resistance from the pads to positive power input)

 

[dnmun]

capacitance. so not a voltage regulator if it doesn't come off that terminal.

 

[Skedgy Sky]

The replacement part came in and I replaced the broken component with it but it didn't help. Charger still powers up but the screen is blank.

I then swapped around the two good chips on the board, the original one at power input and the one that I just put in place but that didn't change anything.

So I'm thinking I must have blown something else on this charger... I looked under the screen pcb but don't see any visible damage to anything so I think I'm going to have to put this charger aside for now unless anyone has anymore ideas.
On a good note, the Thunder 1220 charger came in yesterday.

 

[dnmun]

where he said the gate was on the mosfet, pin #4, can you measure the gate voltage or is it zero?

 

[Skedgy Sky]

I get 0.43 volts on pin 4.
...and 12.7 (input voltage) on gates 1-3.

 

[Electroddy]

Skedgy; Follow the pin 4 trace to the back of the board. There should be a resistor somewhere along it. Usually when one blows chunks out of a MOSFET, the resistor gets fried also. When I replaced the FETs in my controller I had to replace the gate resistors at the same time.