TF536 Rev 2 Design Complete (all gone)

LADmachining · Post by **LADmachining** » 08 May 2020 15:20

No solder whiskers between any pads?

Post by **terriblefire** » 08 May 2020 17:06

Subzero79 wrote: 08 May 2020 14:11 Beetween gng and 3.3 volts i measure 1.1 ohm is normal
Removed all ics exept cpld and measures 1 ohm or is board defect?
Unsolder all parts pcb defective short beetween gnd and 3.3
@ terriblefire need a new one

I'll send you one when i the bulk order arrives. I've never seen a dead short like that from JLCPCB they test them before they get sent out.

Subzero79 · Post by **Subzero79** » 08 May 2020 18:42

One plus one i want to buy

Post by **terriblefire** » 08 May 2020 21:59

Subzero79 wrote: 08 May 2020 18:42 One plus one i want to buy

you tried putting 12V on the 3.3v line with all components removed and see if it burns away?

Subzero79 · Post by **Subzero79** » 09 May 2020 02:40

I will

Post by **terriblefire** » 09 May 2020 09:43

@LADmachining did you get anywhere with testing

LADmachining · Post by **LADmachining** » 09 May 2020 10:24

Subzero79 wrote: 09 May 2020 02:40I will

Are you sure you want to do that? Check his username! ;)

Post by **terriblefire** » 09 May 2020 10:26

LADmachining wrote: 09 May 2020 10:24
Subzero79 wrote: 09 May 2020 02:40I will
Are you sure you want to do that? Check his username! ;)

You will have a brief terriblefire. Then it should clear the short.

My H6632B is good for this. When that runs out of amps i use a car battery.

@Subzero79 if you get photos of the defect for me i'll be able to get a refund from JLCPCB.

LADmachining · Post by **LADmachining** » 09 May 2020 10:30

terriblefire wrote: 09 May 2020 09:43 @LADmachining did you get anywhere with testing

I have not yet found any open or short circuits on the board.

The last thing I can think is that I have somehow killed the CPLD. It was bought from RS, and soldered at a grounded workstation, so not sure what is going on. I have another new spare, so I could try swapping them over.

Apologies for holding up progress on the TF536, I am struggling to find much free time to get into the workshop.

Anthony

Post by **terriblefire** » 09 May 2020 10:32

LADmachining wrote: 09 May 2020 10:30
terriblefire wrote: 09 May 2020 09:43 @LADmachining did you get anywhere with testing
I have not yet found any open or short circuits on the board.

The last thing I can think is that I have somehow killed the CPLD. It was bought from RS, and soldered at a grounded workstation, so not sure what is going on. I have another new spare, so I could try swapping them over.

Apologies for holding up progress on this, I am struggling to find much free time to get into the workshop.

Anthony

No worries. I'm hovering over the trigger button on a 150 pc order so i'm keen to figure out issues before i do.

exxos's Atari, Amiga & retro forum

TF536 Rev 2 Design Complete (all gone)

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