PSP reflowing/reballing

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PSP reflowing/reballing

Postby matic_s » Sat Aug 01, 2015 7:55 pm

I'm working on PSP-E 1004. It doesn't power on. Sometimes I get only green LED and nothing more, sometimes without green light.
If I press down the main BGA it turns on normally. So it is probably bad solder joints on the main BGA.

Image

I can't find stencil on the ebay or other similar shops.

Has anyone already reball or reflow it?
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PSP reflowing/reballing

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Re: PSP reflowing/reballing

Postby playgoods » Mon Aug 03, 2015 2:26 pm

I've reflowed a number of these with great success.
Just don't nudge hard at all.
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Re: PSP reflowing/reballing

Postby VaNDAL_UK » Mon Aug 03, 2015 3:31 pm

playgoods wrote:I've reflowed a number of these with great success.
Just don't nudge hard at all.


+1 here. Reflow & all good!!
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Re: PSP reflowing/reballing

Postby matic_s » Mon Aug 03, 2015 7:47 pm

Thanks. I' ll try reflow it.
Do you use flux when reflowing it?
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Re: PSP reflowing/reballing

Postby Deus » Tue Aug 04, 2015 1:06 am

matic_s wrote:Thanks. I' ll try reflow it.
Do you use flux when reflowing it?

When soldernig ALLWAYS USE FLUX !!!

Sorry, but doing this type of rework, one should know that.
All that info is easy to find on the web.

As reflow = (re)soldering ==>> FLUX !!!!
Flux lowers the surface tension of the solder giving better wetting.
It also removes/prevents oxidation, which mIght not be visible but it is (allways) there.

For BGA lifting some don't use flux, maybe not really necessary, but using it surely won't harm.
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Re: PSP reflowing/reballing

Postby playgoods » Tue Aug 04, 2015 2:01 am

matic_s wrote:Thanks. I' ll try reflow it.
Do you use flux when reflowing it?

I use Insat flux
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Re: PSP reflowing/reballing

Postby matic_s » Tue Aug 04, 2015 2:05 pm

Deusjevoo wrote:
matic_s wrote:Thanks. I' ll try reflow it.
Do you use flux when reflowing it?

When soldernig ALLWAYS USE FLUX !!!

Sorry, but doing this type of rework, one should know that.
All that info is easy to find on the web.

As reflow = (re)soldering ==>> FLUX !!!!
Flux lowers the surface tension of the solder giving better wetting.
It also removes/prevents oxidation, which mIght not be visible but it is (allways) there.

For BGA lifting some don't use flux, maybe not really necessary, but using it surely won't harm.


I always use flux for reflowing/reballing, but I never reflow chip with so small balls. I think the balls are 0.3 mm.
I was worried that the chip will "float" on the flux, and I prefer to ask to be sure.

I don' t have insat flux. I have Amtech NC-559-V2, RMA-223-TFP and chinese Kingbo RMA-218 (yellow colour). I think the NC-559-V2 is the best for this task.
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Re: PSP reflowing/reballing

Postby matic_s » Fri Aug 21, 2015 5:44 pm

Fixed 8-)

Here are some pictures if anybody is interested how it looks.

First I remove thermal tape from the chip for better heat transfer during reflow:
Image

Fixing the board on the machine:
Image

Reflowing with some NC559-V2 flux (I use some aluminium reflecting tape to protect other components from unnecessary heat):
Image

Gluing thin copper heat sink on the chip for better cooling:
Image

Fixed:
Image

Thanks for your help guys.
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