maemo.org - Talk - View Single Post - I true FIX for the WSOD is needed!!

	Mara	2008-02-14 , 19:34
	Posts: 1,310 \| Thanked: 820 times \| Joined on Mar 2006 @ Irving, TX	#30

Originally Posted by dreamscape86

Did anyone else hear a pop when their 770 WSOD'd? For me it happened when I plugged it in to charge it once. It was that kind of... high pitched sucking sound then a pop that you get with electronics sometimes... I don't know enough about electronic engineering to know what it is, but maybe someone has an idea? Eventually I'm going to open mine up and see if I can notice anything that appears to be visibly fried or damaged. I don't really know anything about soldering/desoldering though, so that would probably be the end of my usefulness.

I'm guessing I'm looking for something on the main board itself, since Nate (above) said that he swapped the screen chips and it made no difference. Has anyone tried putting a working screen on a non-working 770 or vice versa?

The high pithed sound likely came from the internal switching power supply inductor... What likely happened is that some component (the display controller?) failed shorting one supply rail, which caused the power supply to go into overload protection. (The power supply might have scaled it switching frequency down to audible range, or it entered into so called "hiccup" mode where it tries to start up, and shuts down if output is overloaded, and tries to start up again... until the fault is cleared.) Finally after few seconds, when did you hear the pop, the short circuit blew open, and no more high pitch sound?

What you should be looking for is maybe a blown capacitor, or look any IC's that may show signs of overheating (charred top).

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