lenovo G550 zombie laptop.
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Re: lenovo G550 zombie laptop.
U50 is likely broken, now you have to check at ouput pins to USB are not shorted.
U50 have to removed from motherboard.Comment
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Re: lenovo G550 zombie laptop.
C443 =10.67 Mega ohms.Last edited by pocgoc; 04-19-2013, 07:46 AM.Comment
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Re: lenovo G550 zombie laptop.
Next check other side of U50 pin 2,3 and C440.
If those are ok it is very likely at just U50 has shorted and broke PU401 also.
Before you buy a new circuit need to make sure thing.Comment
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Re: lenovo G550 zombie laptop.
1. u50
2. pq401
3. c443
I powered it up works but the display/ lcd Back light not working.
I replaced the inverter , got a spare LCD, it still continues to power the back light. Any ideasComment
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Re: lenovo G550 zombie laptop.
check LCVD circuit, inverter pins. vin(+10 - 21V), gnd, on/off (3.3v), brightness(200mv - 3v) if one of them missing trace back to soruce. Still cant find, get vin from dc_bat_out. and others from nearest (s0)state switch..Comment
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Re: lenovo G550 zombie laptop.
I got a refurb board, and its intel based again, no nvidis gpu. But the screen is blank not dead just blank , graphics is none existent . Is this solution a reball/ reflow . Backlight is ok, the LCD cable is okay, and LCD is working on another laptop and it works fine on a external screen. What you guys think, Southbridge reflow?Comment
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Re: lenovo G550 zombie laptop.
hi, i have toshiba L510 , my problem is same there. laptop totally no power no signal, even AC plug in and battery installed, before it become so serious damage,it will auto shut down often by itself, ad later totally gone on the next day,
cpu chcked ok, Ram ok, hard disk ok, NEc 128 tokin been replace, AC adaptr 19V ok,but still no power and no signal at all.kindly advise if someone know how to resolve it,
i believe there is power problem ,but dont know which one its a root cause..Comment
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