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820-3462 blowing R6920
- Thread starter bjf
- Start date
If boards are not affected by liquid, should be U6990.
If liquid spilled in that area, one of the caps, or even U6990, can be damaged.
Sometime caps die without visible reason...
We should thanks god this happens from time to time
If look datasheet from majority of the chips we change, you'll see all have a lot of protections; fortunately still fail.
But when you change something, check for any reason possible, before power up the board again...
If liquid spilled in that area, one of the caps, or even U6990, can be damaged.
Sometime caps die without visible reason...
We should thanks god this happens from time to time
If look datasheet from majority of the chips we change, you'll see all have a lot of protections; fortunately still fail.
But when you change something, check for any reason possible, before power up the board again...
Last edited:
bjf
Member
Thanks for the tips, the hard thing with this board is I did switch out U6990 and it worked for over a month. And then it burned up again. The other ones I have just burn it up right away, which makes life easier if you know why, but I didn't realize the capacitors might be the issue. Thanks for that piece of info. It looks like the board is working fine again now. No fires.