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andyfras

Posted: Tue Jan 31, 2012 3:12 pm

Frequent contributor Joined: 25 Jul 2005 Posts: 2815 Location: Fleet, Hampshire (Hannington)

I have just acquired a bit of kit (Hot Air SMD Rework Station) that will enable me to replace, amongst other things, a faulty USB chip (U54, NET2270) on a Toppy.

I've seen a few with this fault, but I need to know if it's worth me trying to source the chips, probably directly from China, as they are not readily available. I have 2 faulty mainboards that I can use for spares for this and maybe other chips.

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mavison

Posted: Wed Feb 01, 2012 3:25 pm

Frequent contributor Joined: 30 May 2007 Posts: 212 Location: Kent, UK

Ooooh! I have a spare 5800 which I believe is ok except for the USB (blown by one too many USB plug-ins when I was running & upgrading two side by side).

I would be interested ... depending on your cost plus p&p of mainboard or whole box.

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andyfras

Posted: Wed Feb 01, 2012 4:24 pm

Frequent contributor Joined: 25 Jul 2005 Posts: 2815 Location: Fleet, Hampshire (Hannington)

PM sent to mavison.

ces

Posted: Thu Feb 02, 2012 1:24 pm

Regular contributor Joined: 28 Apr 2007 Posts: 82

I suspect my 5800 was one of the ones passing through your hands with a duff USB.

I too am interested but don't really want to be without it for a while as everything is hunky dory at the moment..... [touches wood].

Do you want to PM me too?

andyfras

Posted: Thu Feb 02, 2012 2:55 pm

Frequent contributor Joined: 25 Jul 2005 Posts: 2815 Location: Fleet, Hampshire (Hannington)

ces wrote:

Do you want to PM me too?

After I've practised on mavison's. Laughing

thesaint

Posted: Thu Feb 02, 2012 10:14 pm

Frequent contributor Joined: 15 Apr 2005 Posts: 365 Location: Darlington

andyfras wrote:

ces wrote:

Do you want to PM me too?

After I've practised on mavison's. Laughing

Good job you added the 's' on the end there Andy

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mavison

Posted: Thu Feb 02, 2012 11:18 pm

Frequent contributor Joined: 30 May 2007 Posts: 212 Location: Kent, UK

Me too!

andyfras

Posted: Thu Feb 16, 2012 2:39 pm

Frequent contributor Joined: 25 Jul 2005 Posts: 2815 Location: Fleet, Hampshire (Hannington)

I can now reveal that the initial repair of mavison's mainboard was not successful. I suspect that the USB chip from the donor mainboard was faulty. I swapped it with my spare mainboard, so mavison's Toppy is now fully operational.

I have managed to source the chips from China and they arrived today, so I set about repairing mavison's original mainboard (again). This time I was successful. Very Happy

It's a lot trickier than I thought it would be, but hopefully it'll get easier with practice.

mavison

Posted: Thu Feb 16, 2012 3:39 pm

Frequent contributor Joined: 30 May 2007 Posts: 212 Location: Kent, UK

Congratulations! I am glad you beat it into submission. Excellent service as usual. I hope you have a few more to do!

alan_m

Posted: Thu Feb 16, 2012 4:04 pm

Frequent contributor Joined: 17 Oct 2006 Posts: 2985 Location: Southchurch Village, Southend-on-Sea

mavison wrote:

Congratulations! I am glad you beat it into submission. Excellent service as usual. I hope you have a few more to do!

The few people who do this type of repair (on a irregular basis, as a one off) where I work make use of braid to clear bridged joints. They also use a USB microscope to inspect the finished repair. The microscope is similar to
http://www.ebay.co.uk/itm/USB-Microscope-NEW-Cool-This-Gadget-Gift-Educational-Fun-/220928694295?pt=UK_Toys_Creative_Educational_RL&hash=item3370605817

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andyfras

Posted: Thu Feb 16, 2012 10:49 pm

Frequent contributor Joined: 25 Jul 2005 Posts: 2815 Location: Fleet, Hampshire (Hannington)

I did use desolder braid to clear solder bridges between the pins.

In order to see what I was doing, I doubled up the reading glasses, but the microscope sounds a much better idea.

andyfras

Posted: Fri Feb 17, 2012 10:23 am

Frequent contributor Joined: 25 Jul 2005 Posts: 2815 Location: Fleet, Hampshire (Hannington)

While following the eBay link for the microscope, I came across this:

http://www.ebay.co.uk/itm/Mini-60X-Microscope-Jewelry-Loupe-LED-Magnifier-Currency-Detecting-Pocket-/230738421995?

which I've splashed out on. Very Happy

I'll let you know how it is when I get it.

ryclark

Posted: Fri Feb 17, 2012 10:42 am

Frequent contributor Joined: 10 Jul 2005 Posts: 1453 Location: Shropshire

It will be interesting to see how you get on with it. Wink

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mstombs

Posted: Fri Feb 17, 2012 3:57 pm

Frequent contributor Joined: 31 Dec 2006 Posts: 559

@andyfras I have one just like that, or should I say 'had' because they are so small I can't remember where I saw it last..

alan_m

Posted: Thu Mar 01, 2012 9:38 pm

Frequent contributor Joined: 17 Oct 2006 Posts: 2985 Location: Southchurch Village, Southend-on-Sea

andyfras wrote:

I'll let you know how it is when I get it.

Andy,

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