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Flickering LCD DIsplay - Fix use a power supply


#1

Hi Guys,

Just in case any you are suffering a flickering LCD on your cobra try using a power supply rather than USB power, fixed it for me.

Cheers

Andy


#2

I would suggest to always connect a power supply as soon as you connect something to any fez. (f.e. usb, led’s etc)


#3

I use powered hub. Works much nicer


#4

What kind of powered hub?
url link or picture please! :slight_smile:


#5

Well, usb powered hub is indeed almost the same as a wall wart.

Use use this one from logitech


#6

Any powered hub…of a known brand, not off ebay LOL


#7

I use this one and it works fine.

http://www.dealextreme.com/details.dx/sku.33189


#8

I am using this one http://www.cooldrives.com/7usb20muttul.html


#9

Here is the price comparison:

Logitech 4-port hub ~$US 24.- (without Power Supply Brick)

10-port hub ~$13.60 (http://www.dealextreme.com/details.dx/sku.33189)

7-hub ~$US29 - 40.- (with Power Supply Brick) (http://www.cooldrives.com/7usb20muttul.html)

Logitech is kind of pricey, 10-port hub seem to fit my budget,
I was really conviced by the video advertisement. on the 7-hub.
The one the Gus, used.
I wondered if Gus got convinced by that video too? :smiley: :smiley:


#10

Hmmm, I have never had my Cobra’s screen flicker. Even under battery power it seems fine. Do you guys all have 4.3" screens or something?


#11

I thinks Andy (AKA BobTheDog) has 4.3", mine is 3.5".
I’m just kind of curious about the power hub.
and just want to protect my precious Cobra.


#12

This is not correct. It comes WITH the brick.


#13

Foekie:
May be I read it wrong, but on this review page.
http://reviews.logitech.com/7061/3048/reviews.htm

It said:

And I could not followed the link to Logitech buy page (the link is broken).

So I assumed that it didn’t come with the brick. :frowning:


#14

yeah my 13 dollar one comes with one. :wink:


#15

Ow, then there is something wrong. Those usb hubs are shipped WITH power adapter. :slight_smile:


#16

Hmm interesting my display the 7" lcd is only flickering when I power the cobra from a external supply with 6V/1A, with USB no problem!

Has any body an idea?

The flickering comes after 10-15 minutes of running, very strange, should I use a power supply with more power?


#17

6V is usually okay but I find it better to use 7.5V


#18

Usually this is a sign that the power supply your using has very poor regulation. I’ve seen this same thing with the backlight with an LCD shield on a Domino. Try a different power supply.