rockbox on my Sansa Fuze v2 went and killed the LCD.

[Zander]

Just some back round I had the Sansa Fuze v1 until the screen cracked, I went and got a new one which was Sansa Fuze v2 (due to the fact that I couldn't find any replacement LCDs online). This was my first time using rockbox, and I had it running great (since Tuesday) then today it completely (not entirely sure) went and destroyed the Sansa's LCD.

What had happened was I was outside, and noticed I couldn't see the screen(sunlight). So I went into the settings and turned the brightness all the way up. After that it was running fine for about a good 15 minutes. Although I was noticing that the MP3player it's self was getting warmer.

Then something odd happened, the brightness just went to a constant level, the back light would only come on for one second then shut off, turn on, then shut off.

If I press a button the back light turns off, then the when the selection is processed the back light turns back on, and then it times out.( both in rockbox and the original os)

The MP3 also becomes very warm, I took a sniff from the mircoSD slot and noticed the smell of electronics beginning to overheat

What I also like to point out before any of this happened was my battery was up at 100%, after I turned the brightness up the battery life rapidly declined.

I thought maybe if I went back into the original firmware it would fix this, it did not.

What I think happened is either:
The Battery is shorting out.
The digital pot responsible for the brightness was overloaded.
The LED back light is brunt out
Or something I have not thought of.

Here's some temp data I can give you from my temp probe I have taped to the back side of it.

plugging into the laptop
84F@0s(The probe has some sunlight shining at it otherwise this is ambient temp)
95F@81s

Standing on it's own
85F@0s
91F@122s

While it took longer to heat up, It still shouldn't be noticeably warm while I hold it in my hand.

EDIT:

I found a topic that is pretty much the same problem as me but wasn't caused from the lamp plugin.

http://forums.rockbox.org/index.php?topic=24964.20;wap2

[Zander]

I have came up with an easy work around for this. (Go after the wheel light first)

To turn off the Wheel light, restart the fuze
3 turns clockwise, hit select.
2 turns clockwise, hit select.
4 turns clockwise, hit select.
2 turns counter-clockwise, hit select.
Now this is the part you need to see what you have the wheel time out set to, after which work it all the way up to off.

Once you get your Wheel off change the following,

Change your brightness to 1, set the back light time to around 3 seconds, set the back light time while charging to around 3 seconds.

The overheating should stop.

I'm thinking that the LED driver isn't damaged but something was triggered to prevent it from becoming damaged. It wouldn't make sense to make something that would allow it's self to commit suicide. Though I'm probably wrong, because the battery life fluctuates dramaticly, every time the back light goes on it drops a full one percent, if I leave it alone it goes all the way back up to 99%. I'm thinking maybe the VR is damaged or maybe one of the transistors have fried.

If it was just a malfunction then the problem should go away if I let it cool off, but that's no the case.

What are your thoughts everyone?