Devo 7e TX module flip - SCLK?

Last week I noticed that my ebay watched Devo7e was gone, shortly I deceded to buy a used one.
After cleaning and opening I liked to strip out the useless TX module, only CC2500 and A7105 will run in future.
Although there was visible glue on the top of the module i didn't took care of that.


For all who like to do the same a warning at this point:
BE Careful, my module was glueed to the PCB !!
The result: a damaged PCB!
Due to overheating some pads passed away.. (




Very unlikely, pad/pin 2 - SCLK - passed too.
Where to find the correct signal?
The 7e hardware connections seem to fail, they are tellying of pins 9 and 10 but there are only 7 pins/pads.

SCK is brought to the top of the board with a via. Possibly if you haven't damaged the copper inside the hole, a small wried soldered in there will give you your connection back. If not, look for Pin 21 on the processor, it has a via from the top of the board that you should be able to solder to if you carefully scrape away some of the solder mask.

ouch! though after seeing how squint the module was in my newest 7e I can see why they started gluing them down!

silpstream wrote: SCK is brought to the top of the board with a via.

silpstream wrote: Possibly if you haven't damaged the copper inside the hole, a small wried soldered in there will give you your connection back

if there were any connection I mustn't ask here.
Maybe I should have a try by heating a piece of tinned copper.

silpstream wrote: If not, look for Pin 21 on the processor.

I do not think so, pin 21 isdefinily connected to the 8-pin Flash, if I identified the ordering correctly.
Datasheet names pin 21 as PA5 / SPI1SCK, Hardware-SPI?
But it pointed me to an idea, there is a pin 34 named PB13 / SPI2SCK routed to a lonely via.
This lookes promising.

Check here for alternate points:
www.deviationtx.com/forum/6-general-disc...-off-a-devo-7e#38312

@bianchifan, sorry, my bad. I must have been daydreaming when looking up the pin numbers. I was referring to the via that you pointed an arrow to. That's the one you want.

silpstream wrote: That's the one you want.

thx, I just wanted to clear.

BTW, perhaps someone likes to correct the C&P mismatch



edit..

Arakon wrote: Check here for alternate points:
www.deviationtx.com/forum/6-general-disc...-off-a-devo-7e#38312

Well, if I knew that I might have thought double on a better desoldering procedure...

bianchifan wrote: BTW, perhaps someone likes to correct the C&P mismatch

Wiki updated! Good catch. Thanks!

To get my broken pads repaired I had to choose brute force method: cut all pins and desolder them each by each.
Unfortunately the ordered helper tools didn't help me, not enough space, bore was to narrow.
So it was still a fuck@?!""§$%$/%... job, CPU swappin' was quite easy in comparance.

Luckily I found a handful of old old but still silver shining via rivets, sticker told me something about 0.7/1 mm.
My caliper told 0.9mm diameter, I widened up by they wont fit.
I must widen again to 1mm so the downside pad (1mm) passed away..
Pressed and soldered I must hope thay will remain.

I took the chanche to make pics of the covered parts, perhaps they are helpful for somebody.

LCD backside


hidden PCB part

Devo 7e >> Devo 10

SadSack wrote: Devo 7e >> Devo 10

Sadsack

How to convert LCD devo 10 to use for devo 7e ? i find a LCD same devo 10 from old TX wk2801