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A user has the nanovna H4 with this display defect. Suggestions before switching to a new display?
Igor.

Greetings, One quick and easy check is to make sure that the front and back halves of the case aren’t too tight putting excessive pressure on the display. Try loosening the screws see if the issue subsides

If you look inside the H4 there is a connector which the flat cable from the display plugs into. Perhaps it is not seated well and needs to be reinserted and clamped down. If that does not help you will need a new display.


Roger

try resetting connectors maybe?? there could be just a bad contact

try both .. the connector between the boards .. and also the flat band cable (loosen clamp on the flatband .. pull out, reseat and tighten clamp)

also a cold solder joint may cause such things (inspect solder spots around the flat cable)

good luck

dg9bfc sigi

Am 04.03.2023 um 17:32 schrieb Igor - PY3IG:

Hi Igor,
if you still need a new display, I recommend this one. In 2020, during an installation, a warm part softened in the middle of the display and left a mark. So I ordered and tested a new display, which works fine.
I received the display shown in the attached picture. I can't find this link, I found this link from the seller:
I hope the ST7796U designation does not make a difference in use.

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Gyula HA3HZ ( )