[BUG] Failing to boot (BSOD) after installing MMU3 on MK4 about prusa-firmware-buddy HOT 25 OPEN

On Apr 24, 2024, at 13:08, ClaGre ***@***.***> wrote: Since touching sometimes it works and sometimes it doesn't, couldn't it be a “simple” cold solder that doesn't make contact properly? — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you commented.

On Apr 24, 2024, at 14:08, pars3cproton ***@***.***> wrote: I have 2 of every electronic component, so I can experiment :D i broke the housing of the pin on the sheep board (big one) and probably you were right, those pins are not making good contact with the pd board, since I can just bend the pd board lightly and it works, but if I let go of my hand it doesn’t. I might just end up soldering the two boards together, but I’ll try your new options first! On Wed, 24 Apr 2024 at 13:56, Massimo Castelli ***@***.***> wrote: > oh well, let’s go for another classic: take a metal brush or anything > mildly abrasive and try to scrub the contacts of the cable and the board > clean from a possible oxydation … if this doesn’t fix it, try to push the > cable really well into the socket … I’d not try with the solder before > having asked prusa support though… > > Another possibility is to see if you cn verify the contacts with a tester > both on the cable side and on the board side and see if you find any > “wobbling when pressed” … try the power lines first (easier to find and > from the look of the problem probably the culprit). > > > On Apr 24, 2024, at 13:50, pars3cproton ***@***.***> wrote: > > > > > > Bending the pin slightly didn’t work. i can try resoldering the pin on > the > > pd board, it’s just weird to me that 2 pd board of 2 different batches > show > > the same behavior… > > > > On Wed, 24 Apr 2024 at 13:35, Massimo Castelli ***@***.***> > > wrote: > > > > > that is a valid possibility. I’d try with the pins first (lowest > effort). > > > Then, if you‘re handy with a solder, refresh the soldering on the > > > connector. My bet is that one of the two will fix it... > > > > > > > On Apr 24, 2024, at 13:08, ClaGre ***@***.***> wrote: > > > > > > > > > > > > Since touching sometimes it works and sometimes it doesn't, couldn't > it > > > be a “simple” cold solder that doesn't make contact properly? > > > > > > > > — > > > > Reply to this email directly, view it on GitHub, or unsubscribe. > > > > You are receiving this because you commented. > > > > > > > > > > — > > > Reply to this email directly, view it on GitHub > > > < > #3947 (comment)>, > > > > or unsubscribe > > > < > https://github.com/notifications/unsubscribe-auth/AURA4JQWOV3L4G57WMDVLQDY66KGJAVCNFSM6AAAAABGVWVUZCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDANZUG4ZTKNZSGY> > > > > . > > > You are receiving this because you authored the thread.Message ID: > > > ***@***.***> > > > > > — > > Reply to this email directly, view it on GitHub, or unsubscribe. > > You are receiving this because you commented. > > > > — > Reply to this email directly, view it on GitHub > <#3947 (comment)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/AURA4JUEHL7EC6XVP3KQE33Y66MYRAVCNFSM6AAAAABGVWVUZCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDANZUG43TEMZYGM> > . > You are receiving this because you authored the thread.Message ID: > ***@***.***> > — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you commented.

On Apr 24, 2024, at 11:33, pars3cproton ***@***.***> wrote: my money is on bad solder (or cracked printed circuit trace) on the board you are pressing and the rest of the MMU unit. By pressing you are bending the material enough to restore the contact ... looks like a production defect, I'd ask for a complete new unit. I already got a replacement for both the sheep board and the pd board (big one and small one of the mmu3), replaced and doing the same. I don't need to push it hard, I just need to lightly touch it. I also bought a new mmu3 to printer cable, at this point all the electronics are replaced but still getting the same behavior. I don't know much about boards or circuits or firmwares, but my money is on the actual printer buddy board (I have version 27) — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you commented.

On Apr 24, 2024, at 11:54, pars3cproton ***@***.***> wrote: this is clearly mechanical in nature. Something you are bending with your fingers enable the power to reach the MMU (leds on). You could try to push in different places (eg don’t touch the connectors, just the board; push something else, etc etc) to try to find out where is it making a difference First of all thanks for your answers! :) I tried touching just the cable getting inside the pd board and it boots with that too, pushing the cable inside the connector - not touching the board. If I reboot tho it doesn't boot anymore until I keep the cable pressed inside again. It's weird tho because the cable clicks and it looks in place (I don't feel any jiggle keeping it pushed or not) - also the cable is new. I don't really know what to do at this point — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you commented.

hypothesis: bad manufactured cables and you have two of the same bad batch. You could try this: - remove the cable from the machine. Hold the plastic connector firmly and push the cables inside. You should see, by looking in the little holes or on the side locking tabs if they move. From what you described the seem not to be making contact until you press. I had cables that looked good but were not completely pushed in giving the same effect. - bed very slightly the pins inside the receiving connector and see if it works better (by changing the angle it may make contact) Any chance you have a picture of the cable itself and the socket where it goes in? > On Apr 24, 2024, at 11:54, pars3cproton ***@***.***> wrote: > > > this is clearly mechanical in nature. Something you are bending with your fingers enable the power to reach the MMU (leds on). You could try to push in different places (eg don’t touch the connectors, just the board; push something else, etc etc) to try to find out where is it making a difference > First of all thanks for your answers! :) > I tried touching just the cable getting inside the pd board and it boots with that too, pushing the cable inside the connector - not touching the board. If I reboot tho it doesn't boot anymore until I keep the cable pressed inside again. It's weird tho because the cable clicks and it looks in place (I don't feel any jiggle keeping it pushed or not) - also the cable is new. > I don't really know what to do at this point > > — > Reply to this email directly, view it on GitHub, or unsubscribe. > You are receiving this because you commented. > — Reply to this email directly, view it on GitHub <#3947 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AURA4JUUA3V22BZJS6AAJQ3Y657N7AVCNFSM6AAAAABGVWVUZCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDANZUGU3TSNZTHA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

that is a valid possibility. I’d try with the pins first (lowest effort). Then, if you‘re handy with a solder, refresh the soldering on the connector. My bet is that one of the two will fix it... > On Apr 24, 2024, at 13:08, ClaGre ***@***.***> wrote: > > > Since touching sometimes it works and sometimes it doesn't, couldn't it be a “simple” cold solder that doesn't make contact properly? > > — > Reply to this email directly, view it on GitHub, or unsubscribe. > You are receiving this because you commented. > — Reply to this email directly, view it on GitHub <#3947 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AURA4JQWOV3L4G57WMDVLQDY66KGJAVCNFSM6AAAAABGVWVUZCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDANZUG4ZTKNZSGY> . You are receiving this because you authored the thread.Message ID: ***@***.***>

On Apr 24, 2024, at 13:50, pars3cproton ***@***.***> wrote: Bending the pin slightly didn’t work. i can try resoldering the pin on the pd board, it’s just weird to me that 2 pd board of 2 different batches show the same behavior… On Wed, 24 Apr 2024 at 13:35, Massimo Castelli ***@***.***> wrote: > that is a valid possibility. I’d try with the pins first (lowest effort). > Then, if you‘re handy with a solder, refresh the soldering on the > connector. My bet is that one of the two will fix it... > > > On Apr 24, 2024, at 13:08, ClaGre ***@***.***> wrote: > > > > > > Since touching sometimes it works and sometimes it doesn't, couldn't it > be a “simple” cold solder that doesn't make contact properly? > > > > — > > Reply to this email directly, view it on GitHub, or unsubscribe. > > You are receiving this because you commented. > > > > — > Reply to this email directly, view it on GitHub > <#3947 (comment)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/AURA4JQWOV3L4G57WMDVLQDY66KGJAVCNFSM6AAAAABGVWVUZCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDANZUG4ZTKNZSGY> > . > You are receiving this because you authored the thread.Message ID: > ***@***.***> > — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you commented.

oh well, let’s go for another classic: take a metal brush or anything mildly abrasive and try to scrub the contacts of the cable and the board clean from a possible oxydation … if this doesn’t fix it, try to push the cable really well into the socket … I’d not try with the solder before having asked prusa support though… Another possibility is to see if you cn verify the contacts with a tester both on the cable side and on the board side and see if you find any “wobbling when pressed” … try the power lines first (easier to find and from the look of the problem probably the culprit). > On Apr 24, 2024, at 13:50, pars3cproton ***@***.***> wrote: > > > Bending the pin slightly didn’t work. i can try resoldering the pin on the > pd board, it’s just weird to me that 2 pd board of 2 different batches show > the same behavior… > > On Wed, 24 Apr 2024 at 13:35, Massimo Castelli ***@***.***> > wrote: > > > that is a valid possibility. I’d try with the pins first (lowest effort). > > Then, if you‘re handy with a solder, refresh the soldering on the > > connector. My bet is that one of the two will fix it... > > > > > On Apr 24, 2024, at 13:08, ClaGre ***@***.***> wrote: > > > > > > > > > Since touching sometimes it works and sometimes it doesn't, couldn't it > > be a “simple” cold solder that doesn't make contact properly? > > > > > > — > > > Reply to this email directly, view it on GitHub, or unsubscribe. > > > You are receiving this because you commented. > > > > > > > — > > Reply to this email directly, view it on GitHub > > < #3947 (comment)>, > > or unsubscribe > > < https://github.com/notifications/unsubscribe-auth/AURA4JQWOV3L4G57WMDVLQDY66KGJAVCNFSM6AAAAABGVWVUZCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDANZUG4ZTKNZSGY> > > . > > You are receiving this because you authored the thread.Message ID: > > ***@***.***> > > > — > Reply to this email directly, view it on GitHub, or unsubscribe. > You are receiving this because you commented. > — Reply to this email directly, view it on GitHub <#3947 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AURA4JUEHL7EC6XVP3KQE33Y66MYRAVCNFSM6AAAAABGVWVUZCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDANZUG43TEMZYGM> . You are receiving this because you authored the thread.Message ID: ***@***.***>

On Fri, 26 Apr 2024 at 12:51, Massimo Castelli ***@***.***> wrote: were you able to solve the issue? — Reply to this email directly, view it on GitHub <#3947 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AURA4JTLJFPD562XPPD7CL3Y7IWTZAVCNFSM6AAAAABGVWVUZCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDANZZGE2TCNZRGM> . You are receiving this because you authored the thread.Message ID: ***@***.***>