Need help identifying component

[_rushin_or_draggin_]

Hey all, I hope I’m posting this in the right section. I recently had a lightning strike nearby and the HDMI port on my NVR no longer works. Everything else works fine, including the VGA output. With that in mind, I’m focusing my attention around the HDMI port section of the PCB and notice 2 ICs each 10 pins. The only text on them is 33C and on the soldermask D34 and D35. It looks like the positive and negative pins from the HDMI TMDS channels and clock go into one side and the other side goes to something under a heat sink. Only 4/5 pins on each side are used and the middle pin is NC. I’ll try to attach a photo. Thanks!

[selcuk]

It can be an ESD diode. IP4283CZ10 or similar.

[fzabkar]

I think it might be this:

SEU3304PC, Salltech, 4-Line Ultra Low Capacitance TVS Diode, 3.3V, marking 33C, DFN2510-10:
http://www.salltech.com/UploadFiles/Files/ESD/6.%20ESD%20DF%EF%BC%AE2510/86.ESD%20SEU3304PC%20DFN2510%20Spec.pdf

At the moment I can only access Google's cached version of the datasheet:

https://webcache.googleusercontent.com/search?strip=1&q=cache:http%3A%2F%2Fwww.salltech.com%2FUploadFiles%2FFiles%2FESD%2F6.%2520ESD%2520DF%25EF%25BC%25AE2510%2F86.ESD%2520SEU3304PC%2520DFN2510%2520Spec.pdf

Similar components here:

https://web.archive.org/web/20210923200204/http://salltech.com/sites/default/files/jiejiefangan/Circuit%20protection.pdf

https://datasheet.lcsc.com/lcsc/2012110106_SALLTECH-SEU0524PC_C964550.pdf

[_rushin_or_draggin_]

Thank you for the datasheets! Quick question, since this IC is going on the TMDS channels, which are max 3.3V, should I get a TVS diode with a 3.3V working voltage or 5V?

[wraper]

You should check those TMDS lines for resistance to GND. If any is shorted, remove that ESD protection device. If still shorted after that, IC outputting HDMI is damaged.

[markusdd]

exactly. these devices protect the HDMI retimer/en-/decoder chip that surely follows somewhere downstream.

you should be able to remove them and everything should still work. (or wwork again if one is shorted, which is what most likely happened.

If removing these does not fix it, then the downstream chip has suffered. another option is that these HDMI lines have additional external filters on them, these are also famous for going bad when ESD events occur.

Make sure to replce the ESD protection Diodes if one is bad, ESD surging on HDMI is common. You should be able to use any HDMI capable ESD diodes, they usually have this denoted in the datasheet, examples have been posted.