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I am trying to troubleshoot a broken PCB and I am struggling to identify these 6 components with metal case.

What are they, and is it possible to test them without removing?

part of PCB showing 6 devices with metal tops

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    \$\begingroup\$ What kind of board is it? \$\endgroup\$
    – JRE
    May 23, 2020 at 7:57
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    \$\begingroup\$ Why not tell us what the function of the PCB is? Did you find it in an ion-thruster control panel for an inter-stellar rocket or in a laptop? Was there a heatsink attached (with the thermal paste causing the white on the board)? Hit the edit link. \$\endgroup\$
    – Transistor
    May 23, 2020 at 7:57
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    \$\begingroup\$ What is the broken device? It would at least give some context to make it easier to recognize. \$\endgroup\$
    – Justme
    May 23, 2020 at 7:57
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    \$\begingroup\$ Regardless, you can't really test most components on board. \$\endgroup\$
    – JRE
    May 23, 2020 at 7:59
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    \$\begingroup\$ @xx102 - Hi, FYI these are the current "Component Identification Question Guidelines". The more information you can supply from that list, the better the chances of identification. As already commented, supplying a description of the device (and in this case, adding a photo of the whole PCB, to give context to the part with those 6 devices) might help to narrow down the type of device. However, without any part numbers visible, this question might not be answerable. Thanks. \$\endgroup\$
    – SamGibson
    May 23, 2020 at 8:34

2 Answers 2

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My best guess is these are heat spreaders with no actual electrical connections, intended to couple heat into a rear mounted heatsink for forward side components

The bottom left one is the main tip off

So I suspect these may be nickel plated copper blocks

If they do have electrical connections, try cleaning with isoproyl alcohol and a toothbrush, if you can see a white ceramic with gold connections on the side you may be in military grade electronics land.

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Those are military-grade ceramic flatpacks with metal lids.

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  • \$\begingroup\$ Unlikely especially not with the grossly visible "alignment error" that would create a pad-to-pad short if it were the actual ic. They're heat spreaders merely stuck on with thermal paste. \$\endgroup\$ May 23, 2020 at 15:27

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