Exploded component on a conga 990 vacuum motherboard

[Deedeelabricolade]

Hello all,

Very common problem but i can't do anything without knowing what that component is and what he is doing?

The vacuum automatically turn the brushes endlessly when battery is plugged in, nothing else. Weird behavior. The plug on the right is the battery in, 14.4V, 2.6Ah.

I'm pretty sure the chip fuck everything up, can somebody help me to identify it?

[petehall347]

Re: Exploded component on a conga 990 vacuum motherboard

clean it and take more photos ..

[Deedeelabricolade]

Re: Exploded component on a conga 990 vacuum motherboard

Thanks for your input, I already try my best but the crater in the chip doesn't really help...

Sadly this chip seems to be unique on this board and I tried to find another motherboard-like picture online to compare to, but found nothing.

Will my last hope be guessing what it is ?

[petehall347]

Re: Exploded component on a conga 990 vacuum motherboard

see what part of the number you can see . i can see something but cant make it out .

[Deedeelabricolade]

Re: Exploded component on a conga 990 vacuum motherboard

Just to be perfectly clear it's the U4 component above the two R100 resistors.

Nothing's visible on it except the hole and it did break when I tried to desolder so no more chance to read anything

[stj]

Re: Exploded component on a conga 990 vacuum motherboard

try using white spirit / mineral spirit to remove the conformal coating from it
16pins, all inputs on one side and all outputs on the other side is interesting.
maybe it's a H-bridge

[Deedeelabricolade]

Re: Exploded component on a conga 990 vacuum motherboard

try using white spirit / mineral spirit to remove the conformal coating from it
16pins, all inputs on one side and all outputs on the other side is interesting.
maybe it's a H-bridge

Very interesting comment, thank you!

I did try to remove the coating, white spirit, isopropyl, still nothing visible on it due to the implosion. My last attempt was to desolder it but I fail miserably and the bloody thing falls apart in pieces. Instant regret.

Indeed it seems to be like a H-bridge. After probing, one side goes to the processor through resistors and the other comes from power supply.

Further in my research, I did find another picture of a look-alike motherboard but again, the reference is barely visible and I did multiple search (mostly like 4x54LRY) but still nothing. I'm getting somewhere, but still in complete darkness

[petehall347]

Re: Exploded component on a conga 990 vacuum motherboard

4954lpt

[R_J]

Re: Exploded component on a conga 990 vacuum motherboard

Allegro A4954, Note the large thermal pad on its case, a hot are station will be required to remove it

[Deedeelabricolade]

Re: Exploded component on a conga 990 vacuum motherboard

Allegro A4954, Note the large thermal pad on its case, a hot are station will be required to remove it

OMG that's it ! Thank you so much ! May I ask you how you find it ?

I have a hot air station, will need some training tho but It's doable.

Thank you again, you made my day already