resistor83
Senior Member
Last Activity: 06-10-2025, 09:14 AM
Joined: 10-10-2018
Location: Italy
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it works!! thanks!! -
here are the measurements between the broken motherboard and the new one, I can see (photo) that between the two motherboards the resistors are positioned differently:
MOTHERBOARD BROKEN ORIGINAL:
RI21 80,6K
RI13 18,6K
RI25 66,7K
RI20 9,8K
MOTHERBOARD NEW WORKING:
RI21 78,5K
RI13 66,3K
RI25 65,3K
RI20 186,3K...Leave a comment:
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lenovo 330s-15ikb, led num lock key always on and numbers don't work
hello everyone, I have a particular problem with this lenovo ideapad 330s-15ikb. I had to replace the motherboard due to liquid damage, after replacing it I noticed that some letters on the keyboard do not work. So I bought a new keyboard and now all the keys work except the numeric keypad area. In practice the num lock key LED always remains on and the numbers do not work. Has anything like this ever happened to you? I also tried changing the keyboard again but the same defect remains on the numeric keypad.
I tried updating the bios but the problem remains
[url]https://streamable.com/c8sj3h[/url]... -
hi, I have the same problem as you,
the samsung chip heats up and I can't see anything
you solved?
I only saw a video on YouTube where they tried to heat that chipLeave a comment:
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hi, I have the same problem as you,
the samsung chip heats up and I can't see anything
you solved?
I only saw a video on YouTube where they tried to heat that chipLeave a comment:
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SSD MacBook Pro 2015 not recognized and gets hot
Hi everyone, a customer brought me an original Apple SSD (mz-jpv2560/0a4) from a 2015 MacBook Pro to ask me to recover the data. He told me that the computer was taken to the Apple center but that there was a problem with the motherboard and therefore it could not be repaired....
However they removed the SSD so for try to recover data
I tried to insert this SSD into another 2014 MacBook Pro that I had but the SSD could not be seen either from the recovery or from an operating system started from USB (BigSur or El Capitan)
I also tried with a USB adapter but nothing
I also...Last edited by resistor83; 12-10-2023, 04:18 AM. -
Re: Macbook pro 15" 820-2915-B 2011 A1286 boot on but black screen
I have a working screen that I tried but it won't turn on so it can't be the display/cable
However, in the MacBooks that I have repaired over the years, when the video card was broken, either the operating system started with various lines on the screen or the screen was black/white but the system did not start in the worst cases. It has never happened to me that the operating system started up and the screen was completely turned off due to the video cardLast edited by resistor83; 09-15-2023, 01:04 PM.Leave a comment:
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Re: Macbook pro 15" 820-2915-B 2011 A1286 boot on but black screen
some measurement:
PP3V3_S0 [B]3,34V[/B]
PP3V3_SW_LCD [B]0V[/B]
U9000: pin 2 and 3 [B]3,34V[/B] pin 4 and 5 [B]0V[/B]Re: Macbook pro 15" 820-2915-B 2011 A1286 boot on but black screen
some measurement:
PP3V3_S0 [B]3,34V[/B]
PP3V3_SW_LCD [B]0V[/B]
U9000: pin 2 and 3 [B]3,34V[/B] pin 4 and 5 [B]0V[/B]Re: Macbook pro 15" 820-2915-B 2011 A1286 boot on but black screen
some measurement:
PP3V3_S0 [B]3,34V[/B]Leave a comment:
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Re: Macbook pro 15" 820-2915-B 2011 A1286 boot on but black screen
no video signal even with the display port adapterLeave a comment:
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Re: Macbook pro 15" 820-2915-B 2011 A1286 boot on but black screen
I have already tried to reset the pram and also the SMC but the screen is still off
here video: [URL="https://streamable.com/1761vz?src=player-page-share"]https://streamable.com/1761vz?src=player-page-share[/URL]Re: Macbook pro 15" 820-2915-B 2011 A1286 boot on but black screen
I have already tried to reset the pram and also the SMC but the screen is still off
here video: [URL="https://streamable.com/1761vz?src=player-page-share"]https://Leave a comment:
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Macbook pro 15" 820-2915-B 2011 A1286 boot on but black screen
Hi everyone, I have this 2011 MacBook Pro 15" model 820-2915-B which has a problem.
I turn it on, the startup sound is heard but the screen doesn't turn on, not even the backlight. The keyboard lights up after a while and the capslock works. If I press any key I can hear sounds as if the system is booting.
I thought it was a screen problem but after changing it the problem remains.
What could I do? -
Re: Acer Aspire 5 A515-51G power on but black screen
Hi, no :\
Have you same problem?Leave a comment:
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Re: Acer Aspire 5 A515-51G power on but black screen
Anyone please?Leave a comment:
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Re: Acer Aspire 5 A515-51G power on but black screen
Thanks for the info.
Could someone tell me what measurements I could do?
Thank youLeave a comment:
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Re: Acer Aspire 5 A515-51G power on but black screen
well, maybe i found the problem. As I wrote a few posts back, there are no voltages on VCC_GT and therefore also on the PL906 coil
By measuring the PQ906 chip I discovered that pin 2 has 19v while pin 1 has 0v
The same chip (PQ1202 and PQ1201) is also present in the area of the dedicated video card and measures them 1,12v
Do you think I should change PQ906?...Leave a comment:
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Re: Acer Aspire 5 A515-51G power on but black screen
I read on some forum that for UMA conversion you have to move RC134 to RC133
I tried to move it but the problem is still there, the only thing is the absorption from 0.50A drops to 0.42. I guess because the video card is actually disabledLeave a comment:
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Re: Acer Aspire 5 A515-51G power on but black screen
could it be the video card?
UMA?Leave a comment:
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Re: Acer Aspire 5 A515-51G power on but black screen
why do you say 4 resistors?
below i put a "before and after" picture and you can see i moved only ID0, ID2 and ID3...Leave a comment:
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Re: Acer Aspire 5 A515-51G power on but black screen
yes, I moved the resistors correctly (see photo), I also tried to put another ram module but nothing...Leave a comment:
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Re: Acer A515-51G need bios dump LA-E892P
thank you!Leave a comment:
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