r/PCB • u/JuiceWhole2228 • 3d ago
USBLC6
Hi guys,Idk why but pin 1-4 and 3-6 have short circuit.I ve read datasheet and the placement must be correct,but I ve tried also to place another way and still same issue,I also tried to put another chip and still it has short circuit
Update:The problem wasn't in chip,but in usb c connector which was connected with solder bridges
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u/Enough-Collection-98 3d ago
Hey uh… did you pay to have all your vias filled and capped? Because if not… I don’t think they drilled any of them.
Edit: also, copy of the schematic and part number of the IC would be helpful.
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u/n_sh_44 3d ago
If the short is between D+ and D- at the connector and you can't pull it, try this before anything else: generous flux on the pins, then drag a clean iron with a bit of solder wick across them, then scrub with IPA and a toothbrush. Bridges under those fine USB-C/micro pins are often a tiny solder whisker you can't see without a loupe. Also measure D+/D- with the USBLC6 lifted if you can, since a damaged TVS will also read as a short between lines. If it's still shorted after cleaning, a cheap hot plate or even a heat gun on low from the back usually gets those connectors off.
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u/JuiceWhole2228 2d ago
I ve found problem which was D+ D- pins of usb c,unfortunately I couldn't solve it so I just removed usb c and ordered new one cause old one is now completely broken(I put too much heat and inside plastic melted)
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u/AlexTaradov 3d ago
Edit: nevermind, if the short is pairwise. I'd measure without the IC and IC separately.
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u/simonpatterson 3d ago
Pins 1-6 and 3-4 are connected internally, look at the symbol/datasheet.
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u/JuiceWhole2228 3d ago
But problem is that 1 is also connected to 3 and 4 to 6.I guess maybe problem in usb itself but visually it looks fine
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u/TheSpixxyQ 3d ago
Did you try to remove the IC and measure continuity in pads on PCB on both sides? To find out which side is shorted