djtaotao
Member
Last Activity: 04-14-2025, 05:36 AM
Joined: 11-08-2023
Location: Hisings Backa
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Here is the boardview.... -
Unfortunately I don't have it. The schematic I posted it above is for the LA-K371P board, most likely the previous Latitude version. That schematic is for free to download on the internet....Leave a comment:
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Then what should I do with the file you upload it?Leave a comment:
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Hello,
is this a cleaned ME file? I noticed this is only the 32MB bios file, should I use the old-unchanged bios 16MB file?
Thanks!...Leave a comment:
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Hello again,
I come back with my problem.
Please help me with bios clean ME.
This time I attached both bios files.
Dell Latitude 7430 - not powering on, not charging.
The USB charger is negotiating the voltage and the USB meter shows 19.98V and 0.08A on both ports.
When I plug in the charger the led on the power button lights up and stays on for 30s, turns off for 1s and turns on again for 30s and so on.
3.3V and 5V are present....Leave a comment:
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I believe so. I tried to "cook" a clean one based on yt tutorials but I failed. The CSME FIT tool is giving me some decompress error messages.Leave a comment:
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Hello,
can anyone please check for me if the attached bios is not corrupted?
Dell Latitude 7430
ST: GRBPJR3
Thanks in advance!...Leave a comment:
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I assume you're referring to the 1st and 2nd mosfets and I think they are opened by the PD controllers, there are 4 mosfets, 2 for each PD and they are P-channel, the voltage on their gates is 1.8V, and the voltage after them is 19.9V....
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AKOK = 3V
ACIN = 3.8VLeave a comment:
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Dell Latitude 7430 - LA-L581P: not powering on, not charging.
Hello guys, I need some help for troubleshoot my personal laptop. It's my first attempt to repair a laptop, I have good soldering skills and basic electronics knowledge.
Dell Latitude 7430 - not powering on, not charging.
The USB charger is negotiating the voltage and the USB meter shows 19.98V and 0.08A on both ports.
When I plug in the charger the led on the power button lights up and stays on for 30s, turns off for 1s and turns on again for 30s and so on.
The main power rail is done by ISL9538, without battery I have +8.6V and with the battery plugged in... -
Yes, I have 3.3V and 5V rails present.
Replacing the charging IC didn't change anything in laptop's behaviour.Leave a comment:
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The battery is charged, it has around 16.2V. I tried to inject some voltage on it but it takes no current.
The laptop has [URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/3202631-latitude-7330-motherboard-photo-near-the-bios-chip?p=3206024#post3206024"]this[/URL] behaviour, is not running and is not charging. I already changed the charging IC which is ISL9538 and the double mosfets PQ700 and PQ701. I don't know where to check the REGN signal on ISL9538.
The...Leave a comment:
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Thanks!
I got different measurements, maybe you have a different processor & ram. I have an i7 + 16 GB of ram.
PL602+PL603 = 12.2 ohms
PL201=32ohms
PL604=21.7ohms
PL501=163ohmsLeave a comment:
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I have almost the same voltages except the fact that the battery is not charging, without battery I have +8.6V and with the battery on I have constant +17.2V. Of course the laptop is not powering on and this is my first laptop I'm trying to repair
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The charger is negotiating the voltage and the USB meter shows 19.98V and 0.08A so definitely is not charging. The led on the power button light up and stays on for 30s, turns off for 1s and turns on again for 30s and so on.
I have 3.3V and 5V present. I don't know who's the suspect.
Can you measure the following coils please?...Leave a comment:
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I'm happy if I helped you.
Now if you can help me I'll be even happier.
Can you please measure for me the voltage of main power rail on PC715, PJ100 or PJP202 with charger conected but with and then without battery connected?Leave a comment:
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I'm working now on my 7430 - LA-L581P, can you please check if it is the same MB, maybe I can help you?Leave a comment:
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