HP Laserjet P2015d - Logic Board - BGA failure
This printer is only a couple of years old. It complains of a paper jam when there isn't one.
Turns out to be a common problem with these after a couple of years. This Formatter Board is the problem. Forum posts talk about baking it (to re-flow the solder ... but they say this fix doesn't last) and other speculate about HP using new (or bad) unleaded solder.
There is a special hidden switch that (when pressed) bypasses the Formatter board. This works and the test pattern prints fine ... so it's definitely this board.
If I hold pressure on the main U1 chip with my finger the printer powers up fine and works. Even continues to work for a while after I let go. But, eventually it starts complaining about a jam, low toner, or other random errors.
Looks to me like a bad solder job on the main CPU. I figured I would just hold the chip down and blow the hot air solder pencil on it. However, I'm looking at this U1 chip and can't figure out how they got it on there or where to blow the air. No solder pads on top. There's a few under it with solder but not many. I'm afraid if I blow hot air on the bottom (enough to resolder the front) all those SMT parts right there under U1 are going to come off.
So, if you needed to resolder this U1 chip, how would you do it?
This printer is only a couple of years old. It complains of a paper jam when there isn't one.
Turns out to be a common problem with these after a couple of years. This Formatter Board is the problem. Forum posts talk about baking it (to re-flow the solder ... but they say this fix doesn't last) and other speculate about HP using new (or bad) unleaded solder.
There is a special hidden switch that (when pressed) bypasses the Formatter board. This works and the test pattern prints fine ... so it's definitely this board.
If I hold pressure on the main U1 chip with my finger the printer powers up fine and works. Even continues to work for a while after I let go. But, eventually it starts complaining about a jam, low toner, or other random errors.
Looks to me like a bad solder job on the main CPU. I figured I would just hold the chip down and blow the hot air solder pencil on it. However, I'm looking at this U1 chip and can't figure out how they got it on there or where to blow the air. No solder pads on top. There's a few under it with solder but not many. I'm afraid if I blow hot air on the bottom (enough to resolder the front) all those SMT parts right there under U1 are going to come off.
So, if you needed to resolder this U1 chip, how would you do it?
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