<div dir="ltr"><div>Hi Stephen,</div><div><br></div><div>It sounds like "conformal coating". You can get it in a spray can or as a brush on goop. I've seen it used often in auto electronics. Some types are a pain to get off, some peel off easily and some need a soak in IPA.</div><div><br></div><div>Hope this helps,</div><div>Tim<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Apr 3, 2024 at 9:53 AM Stephen Irons <<a href="mailto:stephen@irons.nz">stephen@irons.nz</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div id="m_8544631848118393833geary-body" dir="auto"><div>Over the weekend, I repaired my e-book reader. The micro-USB connector was no longer working. It turned out that force from the USB cable had lifted the soldered connections from the PCB. I would have liked to have replaced the connector while the housing was open, but could not find a replacement that looked similar. However, touching up the solder joints with a fine soldering worked a treat.</div><div><br></div><div>The e-book reader is sold as 'water-proof' to something like 2 m for 30 minutes (IP-67?). It seemed that there were lots of places that water could get in: USB connector, power button, case-halves, screw holes, and the screen bezel, at the edges along the case and the edges along the screen.</div><div><br></div><div>There was no real sealing around the USB connector. It was a close fit, but not tight by any means. I have opened many water-proof housings (pet trackers, trail cameras, etc) and was surprised by the lack of rubber seals, etc. I am sure water could get into the housing.</div><div><br></div><div>The thing I found surprising was that the entire PCB was covered front and back with a thin plastic film. The film had obviously been applied after the connectors were fitted, as I had to break the film to remove the connectors.</div><div><br></div><div><div>[There were 5 connectors on the PCB: the USB connector, 3 ZIF connectors for flex PCBs (for screen connection, magnetic cover sensor and one other), and a 2-pin battery connector. Also, a tiny power-button].</div></div><div><br></div><div>The only breaks in the film were around the connectors, and the film was stuck very lightly to the PCB, around the USB connector (leaving the hole open), the flex-PCBs and the battery wires.</div><div><br></div><div>So, water-proofing obviously comes from the plastic film. But what about the battery and screen?</div><div><br></div><div>Has anyone seen something similar? What is this film or the process of applying it called?</div><div><br></div><div>Stephen Irons</div><div><br></div></div>_______________________________________________<br>
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