Question on component on video card \ VOGONS

Question on component on video card

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First post, by lowlytech

Posted on 2021-09-12, 04:31

lowlytech Offline

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Location: Oklahoma, USA

I have a video card that will loose sync, but does boot up half the time, but before POST finishes, the screen starts flickering and goes out. The system will sometimes resync and the display is there where it left off. I think that the inductor L5 may be bad. This goes to pin 14 on the VGA port. When I measure resistance on L5 i get somewhere around 1K ohm. All the other L components in this area test at .20 Ohm, so quite a difference.

Question, can I just take off any surface mount inductor off another card I have that tests at .20 Ohm? Not really sure on how to match up what part I need to try on these very small SMT parts.

Thanks again for any suggestions.

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Reply 1 of 2, by retardware

Posted on 2021-09-12, 12:15

retardware Offline

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I'd go as you already suggested. This VSync signal is uncritical, the inductor's purpose is to skim out HF, you even could bypass it for testing purposes.

Reply 2 of 2, by lowlytech

Posted on 2021-09-12, 21:58

lowlytech Offline

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Rank: Member
Posts: 295
Joined: 2016-06-17, 16:07
Location: Oklahoma, USA

Well i bypassed that inductor and it didn't change the behavior of the monitor dropping sync. Any other ideas other than the main GPU that would cause the sync to drop in and out?

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