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[SOLVED]820-3209 - no backlight (no feedback continuity)

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ytesfay80

ytesfay80

Member
I have this 820-3209 board that was liquid damaged around the lp8550 so I removed the it and replaced it as well as all the components around it.
With the lp8550 removed i did a continuity test from the feedback pad to the probe(938) as well as from the probe(938) to pin 2 of L9701 and there was no continuity for either one. Also when I measured the output caps in diode mode it measured 0.40v which I believe means the feedback line is broken

I put a new lp8550 on to shove my 36AWG to the feedback ball and run it to the probe(938) but while doing that I ended up ripping the probe point pad. Can I just run the wire from the feedback ball straight to Pin 2 of L9701?
 
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dukefawks

Administrator
Which feedback are we talking about here? Usually it is ball A5 that has the bad trace. If it really is B1/B2 then both those balls will need to be connected. I see no issue with soldering directly to L9701 as long as it goes where it needs to.
 
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