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Advise in component on laptop mobo

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lee Hawk

lee Hawk

PCHF Member
May 19, 2023
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#1
Good afternoon all

I am looking for some advise on a laptop motherboard repair I have been working on that was water damages

Now most of the components that had blown are now replaced and the motherboard fires up lights coming on CPU gets warm but so far the screen doesn't light up but shining a flashlight at the right angle can see changes in the screen so it does display an image

The issue I have found is a component that connects from the 19V fail to the screen power rail has blown to bits I have removed it and based on schematics it's a ferrite bead I will attach a couple pictures

My question is can this be bypassed / bridged I only ask because I have seen other people do it but on lower voltage and lower current draw but being power for the screen lighting I'm wondering if it's safe to bridge it

Have had a look online for a replacement but the shipping is just not practical as the cost is actually 100 times higher than the cost of the component

Any advise would be appreciated and I thank you in advance
 

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#2
lee Hawk said:
Now most of the components that had blown are now replaced and the motherboard fires up lights coming on CPU gets warm but so far the screen doesn't light up but shining a flashlight at the right angle can see changes in the screen so it does display an image
Click to expand...
in my experience, this means the backlight in the LCD panel is not getting power or has failed.
apart from that, I don't work on blown laptop motherboards, they are too specialised a part for my tinkering level.
have you costed a new mobo?
 
#3
Bruce said:
in my experience, this means the backlight in the LCD panel is not getting power or has failed.
apart from that, I don't work on blown laptop motherboards, they are too specialised a part for my tinkering level.
have you costed a new mobo?
Click to expand...
Thanks for your reply

I'm kinda new to laptop motherboard repairs recently got all the equipment I was before most into home entertainment electronics repairs components a lot easier to work with

As for the LCD screen yes it's not getting power because of the component mentioned that's blown to bits literally it's connecting from the 19V power rail to the screens power rail ( think you can see from included picture )

Based on schematics it's a ferrite bead and I'm just wondering if I can simply just bridge the gap and do away with it for now just to get it up and running

I'm aware of some posts where people have bridged this before but on much lower voltages and current draw but this being a screen carrying 19V and would draw plenty current I just want to be sure befor sticking a blob of solder across the padsthe screen does display a picture or at least does something it can be seen by using a flash light at the right angle and have done a few basic tests on the power input cable of the screen for any shorta so far looks good so it's just that ferrite bead holding things back

Out of all my experience with electronics ferrite beads is something never worked with before often enough it's resistors caps and chips I play withbut since I got this laptop to pretty much working from complete dead I want to give it that chance of working again and certainly will keep the missus happy as she has sentimental value over it

It got water in it during the typhoon I'm December 2021 it's been sat in my draw in bits since then due to no equipment

As for new Mobo yes had looked them up and found a couple of them but are a bit confusing as the specs of the same version do not match the one I have here and I suspect that's down to being Chinese and sadly Chinese knock offs is very easy to find in Philippines and me being a foreigner computer shops are reluctant to help as they think I can just buy new haha
 
#4
with my (limited) electronics knowledge, circuit engineers don't whack on components that aren't performing some sort of function.
that component may only cost 2 cents, but when you're pumping out 2 million boards a year, it adds up.

so yeah, my guess is that part can't be bypassed, at least without some undesirable flow on affect.

but in all honesty, with the laptops I have owned, unless it's the screen, drive, or memory that can be replaced, anything else is a death warrant - it's either cheaper or at least better cost effectiveness to get a whole new laptop. it sucks I know, this disposable culture we have but there you have it.
 
#5
Bridging or bypassing a damaged ferrite bead that is on the motherboard of a laptop computer is not advised. It is essential to replace the defective component using the proper alternative to ensure its proper function and to avoid any risk of more damage to the device. You should seek out professional advice or search for an appropriate replacement part to guarantee a safe and dependable repair.
 
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