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+LCDVDD_CON [pins 18& 19] has 3,34V and I'm getting signal at display, backlight is missing...
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Lenovo NM-C861 backlight issue
Hello,
the mainboard at first booted only sometimes with memory error.
After ram rework it boots fine but the new issue is no backlight.
Display did not had any issue so I guess something from the motherboard.
At the JEDP1 I have 19V at pins 1 & 2, DISPOFF# at pin 15 is 0V and INVT_PWM at pin 16 is 2,82V.
Same values are with lid closed.
Lid switch works ok when tested with windows software.
Is there something else I'm missing?
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hello, it asks me a password to open it with tebo view
is there a one or I'm doing something wrong?...
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Lenovo HS46A/HS36A NM-D631 schematic & boardview request
Hello, I'd need the schematic & boardview of this lenovo if sb have them.
I need them to identify part with marking 4TK.
Thank youLast edited by rookieme; 09-10-2024, 04:05 AM.
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well same issue, top case removes insulation from mainboard 1 cm right from that screw and shorts line H_PROCHOT#
just apply kapton tape
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in case anyone will need it like I did here it is, cleaned and current latest version...
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OMEN DAG3BDMBAC0 can it work without battery?
The issue is that after removing a dead battery pack, can the above notebook work with only power adapter?
There is no schematic available so I use the LA-G07DP for the regulator SY8286B.
[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3166098}[/ATTACH]
At the 3V regulator the needed +3VPCU is 0,2V with 4,4V at the enable pin 11 [EN2].
When I have the battery connected I get the 3,3V at +3VPCU.
For the battery circuit I use schematic DAG35AMB8E0
[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3166100}[/ATTACH]...
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Well for future usage as I have same model with other issue I was able to test some bios files.
The bios from post 1 is version 1.05 and will work ok.
The bios from post 2 which is version 1.18 didn't worked for me. It is the same I found at huawei support.
I also tried updating the bios from the huawei application to 1.19 version but after that I had no display too.
So at my case the only working is the 1.05 that I already had.
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DA0G7EMBAE0 need help to find the missing 3.3V regulator
Well it seems the board had some minor liquid damage and somebody had tried before to repair it.
Currently it has the 19V but I noticed that the 3.3V regulator is missing.
The 5V one is the RT6258C and the 5V LDO works fine.
What part could I try for the 3V?
The is no schematics available for this one but I guess some similar model could use the same configuration.Last edited by rookieme; 11-28-2023, 06:06 AM.
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Re: Gateway model: GWNR71517-BK
I uploaded the bios and the sn.
I did a search at acer but I didn't managed to find it.
thank you...
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Re: Gateway model: GWNR71517-BK
Thank you for your reply and for reminding the rules.
I did a reading again at rules but couldn't find what I did wrong here.
I haven't uploaded any files or post any s/n in order to not complicate the original request.
I posted to confirm that the original posted bios can boot but will not work properly.
This model uses amd processor and all I could find was info of fixing intel bios....
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Re: Gateway model: GWNR71517-BK
Hello, I have the same model with no boot issue so I tried the faulty bios at post 1 and it boots but it has all the issues that are described. With hdd or bootable usb it just hangs and when there are no any boot devices it boots to bios.
Sadly I wasn't able to find a working one and the gateway gives no bios files too.
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Re: Asus x415EA no pover after first mosfet, notorious BQ24780S
As I currently have a open repair with the same controller let's do some checks.
The dc-in fets are n-ch? What is the gate voltage at them?
At mine [motherboard powers on ok] I have 24,87 V at gates and the PROCHOT is 0V too. My only problem it that it doesn't charge battery so PROCHOT could be ok with the 0V.
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Re: NM-C861 BQ24780S charging issue
JBAT pin5 has 10k resistance to pin15 of PU201 as it should.
Pin23 at PU201 is indeed that low.
Unfortunately I don't have an oscilloscope to test the gates.
I had some thoughts for the kbc [IT8227E-128 CXS] so I tried a IT8227E-128 CXA that I had available but I was unable to program it the correct EC dump even if I was able to read its dump.
Now I have put back the original kbc but I'm unable even to read its dump.
Should I order the CXS version of it to try?
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Re: NM-C861 BQ24780S charging issue
Yes this was covered from post #1...
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