Stubby MNCH raw silver project

[Helomi78 (Bakonyi Péter)]

Hello everyone! Here is my new acquisition, which involves some work and challenges.

I got 2 boards with it, a dna60 and a dna60c, neither is problem-free. The screen doesn’t work on either.

Plan: Sanding and polishing the Stubby casing (this will be the easier part). Screen replacement (this isn’t that complicated either), possibly repairing or replacing the DNA boards if necessary and possible, but at least one needs to work (this is a challenge for me). On the dna60 board, a 6-pin black gizmo seems melted, and the white wire is slightly broken, although the latter is the smaller issue. Oh, and on the same board, I accidentally ripped off the screen ribbon cable connector, so this also needs repair, if it’s worth dealing with because of the previously mentioned 6-pin gizmo.

Goal: Stubby MNCH raw silver

[Janos_Groszeibl (János Groszeibl)]

I’m curious, I think the boards are toast… but I’m rooting for you.

[Zoli76]

I find it suspicious too… but go ahead.

[Helomi78 (Bakonyi Péter)]

I’m also guessing similarly for the Dna60; we’ll see about the Dna60c when the display arrives.

[Zsee (Zsolti)]

Sounds like an exciting project, I’m rooting for you too

Although that dna60 board might be scrap, because based on the picture I also think it might have several issues, but perhaps here is a hint for the “6-legged black gizmo” (according to this, your case is not unique) and I would also check or replace the components around it

Dna60 components identify

si1869dh.pdf

[Tyutyika (Gálik Tamás)]

That’s tough work. But if you can identify the transistor in question (the 6-pin one is usually the NPN version), then just go for it. The replacement is dirt cheap, and as for the labor, there’s always MasterCard for everything else.

[Helomi78 (Bakonyi Péter)]

Thank you for the info @Tyutyika and @Zsee
I wrote to Evolv to precisely identify the suspicious parts awaiting replacement, which I marked with colored dots on the picture. Based on visual inspection, these might be the problematic ones.

The number for the 6-legged gizmo is already known (red), the ribbon cable connector (cyan) might still be resolderable.

I don’t quite understand this either.

@Tyutyika

The ribbon connector on the opposite side always has the same row of clips.

@Tyutyika could you recommend a heat gun, thermal paste?

I might not start working on this dna60 board if the dna60c board works with a screen replacement, because otherwise it works, there’s just no picture. But in the meantime, I’ll gather information until the screen arrives.

[Tyutyika (Gálik Tamás)]

Solder paste, the brand doesn’t matter anymore. It melts with heat and levels out. You need a heat gun that has a narrow nozzle or the small version. Something similar is plenty enough for this kind of work.

[Zoli76]

Ez MTL?

.

.

[TheSoftParade1968 (Zolee)]

Sure it is, can’t you see how narrow the opening is!?

[Zoli76]

I like that it doesn’t have a built-in battery… just if I go downtown, the 4500-meter extension cord better not get tangled…

[TheSoftParade1968 (Zolee)]

That unfortunately comes with it.
Alternatively, a mobile, backpack-mountable generator might also be an option.

[Tyutyika (Gálik Tamás)]

There are also battery-powered versions.

[Zoli76]

Games​

[Helomi78 (Bakonyi Péter)]

The DNA60 board is only running at 0.24 V. This is the max voltage it can currently achieve. Maybe because of the 6-pin gizmo transistor?

[Tyutyika (Gálik Tamás)]

Yes, because a transistor’s fundamental task is amplifying weak electrical signals, switching (turning circuits on and off), as well as voltage regulation.

[Helomi78 (Bakonyi Péter)]

You really get this @Tyutyika. I am completely “illiterate” in this area.

[Tyutyika (Gálik Tamás)]

@Zoli76 would have told you/us if he had been here.

[Helomi78 (Bakonyi Péter)]

It’s a good thing you guys are up to speed, at least there is someone to ask for help and advice.

[Zolika (Czeglédi Zoltán)]

Don’t ask me about stuff like that