Cseries :: Nokia C7 Display Defect?

Feb 3, 2011

I have a Nokia C7-00 that was purchased SIM free and unbranded in Germany, with which I'm experiencing distinct colour banding / gradient problems. It is also common on Nokia N8 displays. I'll try to describe my problem:The first tell tale sign of the issue seems to be a common one: A purplish tint on the top half of the screen saver clock (visible when the phone is keylocked and then the menu key is pressed).As time has passed by since first noticing this problem- I have also noticed that videos and images that are predominantly dark are also having issues being displayed properly. The effect being similar to if the image was being shown on a screen with limited colours, for example, if you set your computer screen to display only 16bit colours. In areas of images that black is supposed to fade into lighter colours, the image is completely off.

I have contacted Nokia care and they have no input other than re-installing my firmware (which is impossible to do anyway- as they seem to have provided me with inaccurate instructions- there is no way to re-install my firmware via Ovi Suite or the handset)I've since moved away from Germany and from what I understand my 2 year warranty is only valid in Europe...

Attachment 1 is supposed to be black to white squares in increasing gradient

Attachment 2 is supposed to be black into white, but on my display somehow a brown/purple tint is in between the black and white

Attachment 3 is the screensaver clock that is supposed to be black, but on my screen the top half is displayed with a purple hue

Here is an image of two Nokia N8's from someone experiencing the same display characteristics as my C7, and one with a good display. The problem can be seen better in these images:

Nokia N8 Display 1
Nokia N8 Display 2

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I love my Nokia E52, but one of the main reasons I bought it (the combination of WiFi Wireless Lan support and fully integrated Voice over IP client) is not usable due to very laggy, unsteady WLAN connection (while having perfect signal strength - E52 shows 100% (same room)).Because of this I get choppy VoIP (cracks and interruptions up to several words in my VoIP conversations).

My E52:
Software version: 031.012
Modell: E52-1
Type: RM-469

This is not a problem of the VoIP Client, audio-codec, or SIP provider/internet connection.It is the Wireless Lan connection between my E52 and my Router. I tried 3 different access points, with and without wireless encryption, 802.11b (1M...11M data-rate) and 802.11g - problem always the same.
I can track it down by pinging my E52 (idle without any programs running) from my Linux box:

192.168.0.100 is the IP of my E52 assigned by DHCP.
1.) 64byte pings, once per second:

PING 192.168.0.100 (192.168.0.100) 56(84) bytes of data.
64 bytes from 192.168.0.100: icmp_seq=1 ttl=69 time=6.36 ms
64 bytes from 192.168.0.100: icmp_seq=2 ttl=69 time=57.9 ms
64 bytes from 192.168.0.100: icmp_seq=3 ttl=69 time=80.9 ms
64 bytes from 192.168.0.100: icmp_seq=4 ttl=69 time=203 ms
64 bytes from 192.168.0.100: icmp_seq=5 ttl=69 time=128 ms
64 bytes from 192.168.0.100: icmp_seq=6 ttl=69 time=50.0 ms
64 bytes from 192.168.0.100: icmp_seq=8 ttl=69 time=324 ms
64 bytes from 192.168.0.100: icmp_seq=9 ttl=69 time=79.7 ms
64 bytes from 192.168.0.100: icmp_seq=10 ttl=69 time=37.5 ms
64 bytes from 192.168.0.100: icmp_seq=11 ttl=69 time=60.0 ms

64byte pings using a good wireless 802.11g connection should be around 1ms and constant!!It's not because of bandwith limit of E52 wlan/cpu, because the higher ping times stay the same, even if I increase ping-packet-size 150x:
2.)10000byte pings (150x times bigger packages!), once per second [still ping times look quite similar]:

PING 192.168.0.100 (192.168.0.100) 10000(10028) bytes of data.
10008 bytes from 192.168.0.100: icmp_seq=1 ttl=69 time=175 ms
10008 bytes from 192.168.0.100: icmp_seq=2 ttl=69 time=89.8 ms
10008 bytes from 192.168.0.100: icmp_seq=3 ttl=69 time=115 ms
10008 bytes from 192.168.0.100: icmp_seq=4 ttl=69 time=234 ms
10008 bytes from 192.168.0.100: icmp_seq=5 ttl=69 time=153 ms
10008 bytes from 192.168.0.100: icmp_seq=6 ttl=69 time=83.7 ms

3.) Small 64byte pings, but now ten pings per second:
Now it gets even more strange:
# ping 192.168.0.100 -i 0.1
PING 192.168.0.100 (192.168.0.100) 56(84) bytes of data.
64 bytes from 192.168.0.100: icmp_seq=1 ttl=69 time=200 ms
64 bytes from 192.168.0.100: icmp_seq=2 ttl=69 time=95.0 ms
64 bytes from 192.168.0.100: icmp_seq=3 ttl=69 time=2.25 ms
64 bytes from 192.168.0.100: icmp_seq=4 ttl=69 time=5.93 ms
64 bytes from 192.168.0.100: icmp_seq=5 ttl=69 time=4.34 ms
64 bytes from 192.168.0.100: icmp_seq=6 ttl=69 time=8.45 ms
64 bytes from 192.168.0.100: icmp_seq=7 ttl=69 time=5.91 ms
64 bytes from 192.168.0.100: icmp_seq=8 ttl=69 time=2.69 ms
64 bytes from 192.168.0.100: icmp_seq=9 ttl=69 time=2.31 ms
64 bytes from 192.168.0.100: icmp_seq=10 ttl=69 time=5.90 ms
64 bytes from 192.168.0.100: icmp_seq=72 ttl=69 time=8.42 ms
64 bytes from 192.168.0.100: icmp_seq=73 ttl=69 time=7.25 ms
64 bytes from 192.168.0.100: icmp_seq=74 ttl=69 time=7.28 ms
64 bytes from 192.168.0.100: icmp_seq=75 ttl=69 time=7.25 ms
64 bytes from 192.168.0.100: icmp_seq=76 ttl=69 time=7.24 ms
64 bytes from 192.168.0.100: icmp_seq=77 ttl=69 time=7.92 ms
64 bytes from 192.168.0.100: icmp_seq=78 ttl=69 time=7.24 ms
64 bytes from 192.168.0.100: icmp_seq=79 ttl=69 time=8.69 ms
64 bytes from 192.168.0.100: icmp_seq=80 ttl=69 time=10.9 ms
64 bytes from 192.168.0.100: icmp_seq=81 ttl=69 time=10.6 ms
64 bytes from 192.168.0.100: icmp_seq=150 ttl=69 time=213 ms
64 bytes from 192.168.0.100: icmp_seq=151 ttl=69 time=105 ms
64 bytes from 192.168.0.100: icmp_seq=152 ttl=69 time=3.09 ms
64 bytes from 192.168.0.100: icmp_seq=153 ttl=69 time=2.23 ms
64 bytes from 192.168.0.100: icmp_seq=154 ttl=69 time=2.14 ms
64 bytes from 192.168.0.100: icmp_seq=155 ttl=69 time=3.78 ms
64 bytes from 192.168.0.100: icmp_seq=156 ttl=69 time=3.02 ms
64 bytes from 192.168.0.100: icmp_seq=157 ttl=69 time=5.48 ms
64 bytes from 192.168.0.100: icmp_seq=158 ttl=69 time=2.15 ms
64 bytes from 192.168.0.100: icmp_seq=159 ttl=69 time=2.13 ms
^C
--- 192.168.0.100 ping statistics ---
159 packets transmitted, 30 received, 81% packet loss, time 16866ms
rtt min/avg/max/mdev = 2.130/25.327/213.218/54.102 ms, pipe 2

Note: My Linux Ping Command doesn't say something like "Request timed out." for lost packets (like Windows Ping does). So if there is a jump from icmp_seq=81 to icmp_seq=150 it is because everything in between got lost.

You see, in 3.) it has the slow pings once in a while and in between almost normally fast pings, but suddenly a long lag of 6-7sec (this is deadly for voip) and then the circle repeats.Is my E52 wlan chip defect, or is this some kind of Power-Management system? How can I turn it off?I don't need a fast wlan connection on my E52. 1MBit/s is more than enough. But it has to be steady, without lags.

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