Microsoft Surface HUB 2S - martwy

Cześć. Mam 3 sztuki Microsoft Surface HUB 2S, wszystkie martwe. Miałem jedną sprawną sztukę, więc sprawdziłem i wykluczyłem uszkodzenie zasilacza, komputera i płyty pośredniej do której wpinam komputer. Po długiej przeprawie z rozbieraniem mechanizmu obrotu ekranu, dostałem się do TCONa. No i tutaj jest problem. Niestety nie mam żadnego doświadczenia w naprawie TCONów. Na wejściu zasilania na TCON, jest bezpiecznik 60V/7A, a za nim dwa kondensatory (chyba filtrujące). Jeden z nich: TC16 był przebity, aż pękła obudowa. Drugi, obok C306 był ok. Po wylutowaniu TC16 zniknęło zwarcie. Oba kondensatory są tantalowo polimerowe: Panasonic 16TQC150MYF. Dla próby wlutowałem tam inny, akurat taki znalazłem 470uf, 20V, ale po próbie włączenia Surface Huba też strzelił. Zastanawiam się, czy coś dalej jest uszkodzone i dlatego ten kondek strzela, czy po prostu wystarczy wlutować dwa nowe, takie jak oryginalne i wszystko będzie śmigać. Mam je już zamówione. Dorzucam zdjęcie płytki. Na zdjęciu aktualnie oba kondensatory są wylutowane.

TipSerw napisał(a):Dla próby wlutowałem tam inny, akurat taki znalazłem 470uf, 20V, ale po próbie włączenia Surface Huba też strzelił.

Hello!
Do you mean just the fuse blow up again, or the replacement capacitor as well?

TipSerw napisał(a):Zastanawiam się, czy coś dalej jest uszkodzone i dlatego ten kondek strzela, czy po prostu wystarczy wlutować dwa nowe, takie jak oryginalne i wszystko będzie śmigać.

Such tantalum capacitors usually fail for no specific reason.
The only other possible reason for failure is an overvoltage on this power rail (or the reversed polarity, but this option probably can be excluded).

The replacement capacitor blew up again, even though it had a higher voltage rating. Polarity was ok Also, after desoldering both capacitors, I decided to perform a voltage injection test, even though the multimeter didn't show a short anywhere. I set my lab bench power supply (GWInstek GPP-2323) to 12V with a 0.1A limit to start, but the PSU started clicking rapidly. I’m not sure if this is due to my own lack of experience or if there's an actual fault on the board, but I’ve never seen this PSU behave this way before.

Measure the voltage to ground on the input (connector CN1 side) of this fuse F2.
If the voltage is 12V, post a clear picture with visible markings on the replacement capacitor you used for the test.

TipSerw napisał(a):I set my lab bench power supply (GWInstek GPP-2323) to 12V with a 0.1A limit to start, but the PSU started clicking rapidly.

Some of the DC/DC converters on the board probably started up, but due to the current limit on the laboratory power supply being too low (only 100mA), the voltage at the output of the laboratory power supply dropped, after which the undervoltage protection was activated, which turned off the DC/DC converters. Due to the shutdown, the current consumption decreased, the voltage rose again back to 12V and the DC/DC converters started up again, after which the same thing was repeated indefinitely.

Interesting find. Everything works perfectly without those capacitors. I’ve reassembled the unit, and the screen lit up normally.Now the question is: should I leave it as is, or solder new capacitors with the original specs? I’ve noticed that earlier revisions of these T-CON boards didn't even have these caps populated. Previously, I was hesitant to power it on to avoid any potential further damage.The voltage measured at the fuse is 11.86 V. The original capacitors were 150uF. For the test, I replaced blowed one with a 480uF unit (which subsequently failed during my earlier attempt). See the photos below for details.

TipSerw napisał(a):Now the question is: should I leave it as is, or solder new capacitors with the original specs?

In my opinion it's better to solder them.

TipSerw napisał(a):I replaced blowed one with a 480uF unit (which subsequently failed during my earlier attempt). See the photos below for details.
[ Obrazek ]

Everything is clear now

Fair point, you learn something new every day! In that case, I’ll solder in the original-spec capacitors and hopefully, they'll last longer this time. Thanks a lot for the help, and fingers crossed the other two units have the same issue!