Active Topics
-
The N900 is now 15 years old! (7)
to Nokia N900 by Danct12 - 1 day, 17 hrs ago -
Sailfish OS for the Motorola Moto G7 Power (XT1955-5) - (ocean) (4)
to SailfishOS by Maemish - 2 days, 12 hrs ago -
F(x)tec Pro1x (QWERTY) for sale (0)
to Buy & Sell by aln00000 - 4 days, 21 hrs ago - more...
| The Following User Says Thank You to Alecsandru For This Useful Post: | ||
 |
|
2013-06-16
, 16:51
|
|
Posts: 1,974 |
Thanked: 1,834 times |
Joined on Mar 2013
@ india
|
#2
|
Take a tooth brush dip the tip in ethyl alchol clean the board like you brush your teeth but gently with mild preassure and use a needle to clean every contact points you find
i think somewhere moisture accmulated and oxydised the parts .
Btw it wont do any harm cleaning it
i think somewhere moisture accmulated and oxydised the parts .
Btw it wont do any harm cleaning it
| The Following User Says Thank You to nokiabot For This Useful Post: | ||
 |
|
2013-06-16
, 17:30
|
|
Posts: 439 |
Thanked: 282 times |
Joined on Oct 2012
|
#3
|
I need a hint of what is sensing the short-circuit , the flash pcb is pretty simple ,but what is sensing that short-circuit
Last edited by Alecsandru; 2013-06-16 at 17:33.
__________________
N900 Beast featuring :
8GB OPTFS@ext4(*performance mount options)
overclock: cpu[125 - 1,150(*VDD1)+Dsp overclock
CSSU-T latest version
N900 Beast featuring :8GB OPTFS@ext4(*performance mount options)
overclock: cpu[125 - 1,150(*VDD1)+Dsp overclock
CSSU-T latest version
Last edited by Alecsandru; 2013-06-16 at 17:33.
| The Following User Says Thank You to Alecsandru For This Useful Post: | ||
|
|
2013-06-16
, 17:48
|
|
Posts: 1,974 |
Thanked: 1,834 times |
Joined on Mar 2013
@ india
|
#4
|
Originally Posted by Alecsandru
no idea
I need a hint of what is sensing the short-circuit , the flash pcb is pretty simple ,but what is sensing that short-circuit
but surely somebody here knows itbtw its not wise to keep using it like that i think . So i recomended cleaning
| The Following User Says Thank You to nokiabot For This Useful Post: | ||
|
|
2013-06-16
, 18:03
|
|
Posts: 1,048 |
Thanked: 1,127 times |
Joined on Jan 2010
@ Amsterdam
|
#5
|
Originally Posted by Alecsandru
I have no idea what could be causing this, other than what the warning tells you. I did, however, notice the spelling mistake in "circut" that you yourself I assume auto corrected in the topic title. The only google hits point to the patch for flashlight. Have you seen it?
I need a hint of what is sensing the short-circuit , the flash pcb is pretty simple ,but what is sensing that short-circuit
Have you tried a reinstall to see if the warning popped up again?
__________________
download free linux books
online linux guides
download n900: service manual level 1-4
download free linux books
online linux guides
download n900: service manual level 1-4
|
|
2013-06-16
, 18:18
|
|
Posts: 439 |
Thanked: 282 times |
Joined on Oct 2012
|
#6
|
I was typing from the phone when I started this thread , the question is: it's really detecting a short-circuit? and if it detects the short-circuit , where is it? how do it get detected ?, reading what , from where? with the help of what? I'm reading the datasheet but no luck yet ,but the software part , from where does the pop-up appear ? how it's triggered ? many questions , to many I fear
Last edited by Alecsandru; 2013-06-16 at 18:32.
__________________
N900 Beast featuring :
8GB OPTFS@ext4(*performance mount options)
overclock: cpu[125 - 1,150(*VDD1)+Dsp overclock
CSSU-T latest version
N900 Beast featuring :8GB OPTFS@ext4(*performance mount options)
overclock: cpu[125 - 1,150(*VDD1)+Dsp overclock
CSSU-T latest version
Last edited by Alecsandru; 2013-06-16 at 18:32.
| The Following User Says Thank You to Alecsandru For This Useful Post: | ||
 |
|
2013-06-16
, 19:30
|
|
Posts: 1,986 |
Thanked: 7,698 times |
Joined on Dec 2010
@ Dayton, Ohio
|
#7
|
Originally Posted by Alecsandru
Ah, I've been playing around with the flash LEDs recently, so I know a little bit about it. I'm not sure how many flashlight apps are out there right now, but I suspect all of them are using the "Video for Linux 2" (V4L2) interface. That interface allows you to query the hardware for a variety of error conditions, including timeouts, overvoltage, overtemperature, and short circuit.
the question is: it's really detecting a short-circuit? and if it detects the short-circuit , where is it? how do it get detected ?
From the ADP1653 data sheet, there is this info about the short circuit fault:
Short-Circuit Fault
The HPLED pin features short-circuit protection that disables the ADP1653 if it detects a short circuit to ground at the cathode of the LED(s). The ADP1653 monitors the HPLED voltage once the part is enabled in torch mode. If after 820 ms the HPLED pin remains grounded, a short circuit is detected. INT goes low, and Bit D3 (FLT_SCP) of the FAULT register is read back as high. Avoid false triggering of the Short Circuit Fault by not changing the torch current level while the short-circuit detection circuit is making a measurement of HPLED pin voltage. Do not change torch setting directly between two non-zero torch levels 750 ms to 900 ms after the torch has been enabled. To change torch mode current level between two non-zero torch levels 750 ms to 900 ms after enabling torch mode, use the following sequence:
Torch Current Setting #1
Torch Current Setting = 0
Torch Current Setting #2
Torch mode and flash modes can be enabled or disabled at any time.
So far as I know, V4L2 only allows a single Torch current setting, so you shouldn't be able to cause a false trigger the way that they describe. However, I guess that would depend on how the app is connecting to the LEDs.
Quick question: when this error first crops up, do the LEDs come on for a brief period (half a second or so), or does the error message come up immediately?
EDIT: Ah, actually you've already answered that question in the first post.
If it was a fault in how the software was accessing the LEDs, I would assume the error message would come up immediately. The fact that the LEDs stay on for a while may indicate that there is, in fact, a short circuit going on somewhere...
Last edited by Copernicus; 2013-06-16 at 19:34. Reason: Already answered
| The Following 5 Users Say Thank You to Copernicus For This Useful Post: | ||
 |
|
2013-06-16
, 21:00
|
|
Posts: 6,447 |
Thanked: 20,981 times |
Joined on Sep 2012
@ UK
|
#8
|
Originally Posted by Copernicus
Or a false positive caused by a sudden change in the LED current, such as might happen if the battery is on its last leg. Which might explain the erratic nature of the problem. One question: does it ever happen when on a charger? The solution may be as simple as getting a new battery...
The fact that the LEDs stay on for a while may indicate that there is, in fact, a short circuit going on somewhere...
| The Following 4 Users Say Thank You to pichlo For This Useful Post: | ||
|
|
2013-06-16
, 21:44
|
|
Posts: 439 |
Thanked: 282 times |
Joined on Oct 2012
|
#9
|
same thing on charger , but a strange problem , the torch lights up only one led while camera fires up both when taking pictures
i'll replace the led , but the problem is that it fires up well when I take photos
i'll replace the led , but the problem is that it fires up well when I take photos
__________________
N900 Beast featuring :
8GB OPTFS@ext4(*performance mount options)
overclock: cpu[125 - 1,150(*VDD1)+Dsp overclock
CSSU-T latest version
N900 Beast featuring :8GB OPTFS@ext4(*performance mount options)
overclock: cpu[125 - 1,150(*VDD1)+Dsp overclock
CSSU-T latest version
| The Following User Says Thank You to Alecsandru For This Useful Post: | ||
|
|
2013-06-16
, 22:10
|
|
Posts: 1,986 |
Thanked: 7,698 times |
Joined on Dec 2010
@ Dayton, Ohio
|
#10
|
Originally Posted by Alecsandru
Personally, I doubt that the LED is bad, especially if it lights up when in flash mode. More likely, there is something causing a short circuit -- i.e., something like a fragment of metal stuck somewhere, allowing electricity to flow where it shouldn't.
same thing on charger , but a strange problem , the torch lights up only one led while camera fires up both when taking pictures
i'll replace the led , but the problem is that it fires up well when I take photos
But I will bow out here; I know a bit about coding, but I have no clue about physically messing around with hardware.
| The Following 3 Users Say Thank You to Copernicus For This Useful Post: | ||
Turning off Flashlight.
I have this pop-up when I use flashlight , the time interval is randomly(from few swconds to minutes or not at all) , when I take photos I have full flash blast(no error) , I don't think it's a hardware problem , no water and no impacts on the phone , this thing started today , any hints on this ?
8GB OPTFS@ext4(*performance mount options)
overclock: cpu[125 - 1,150(*VDD1)+Dsp overclock
CSSU-T latest version