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I have an orange flash then 4 white flashes what does this mean please?
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I have already looked, I have no shorts, the voltages are good, the battery charges well, the backlit keyboard lights up correctly, but no display, the shift key does not respond, I tried with an external screen, and I tried other rams, for me it probably comes from the bios but I tried many bios here nothing worked...
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I tried same result lights up no display, I also tried many bios here but nothing worked for me :s...
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Hi, I have a dell g3 "15-3500-860?" that turns on but no display, can you clean the bios for me please, unfortunately I no longer have the label on the cover.
But the motherboard model is 19753-1, 10 ème génération. i7. nvidia
I tried post 9 and 133 but it doesn't work the laptop lights up, flashes then turns off...1 PhotoLast edited by madjid911; Yesterday, 07:17 AM.
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ACDET to GND : 177kohms 0V
I removed PQB11 the result is the same when I plug in the battery the mofest no longer sends the 20v
it's not the same subject, mine works perfectly without battery, it's just that once you plug in the battery it goes into safety mode and turns off, there's no way to turn it back on, you have to disconnect the battery...Last edited by madjid911; 04-23-2024, 10:40 AM.
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ok thank you, so I checked everything (resistance, soldering, shorts) I can't find anything, I don't see where the problem is coming from...
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Originally this laptop came with a short circuit on the PCZ70 capacitor, two weeks later it was short circuited again so I had to change it twice, maybe the overconsumption comes from there?
The GPU has very low resistance, is it normal to have only 0.3 ohms on the GPU? I disconnected the coils but the result remains the same when I connect the battery the mosfets are no longer closed...
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broches 19 et 20 : 20,2OHMS (résistance PRB26 and PRB24 are good 10HOMS)
résistance PRB19 is good 0HOM
on the other hand I don't have the PCB24 component, is this normal or is it a missing capacitor?...
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I use the diagram that I attached on the first page (LA-J871P).
It seems as you say that this resembles excessive consumption when the battery is connected, so the bq24 goes into safety mode and no longer gives the signal, but where can this consumption come from?
for welds I always check under the microscope that everything is well connected...
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I again changed the bq24 charging ic with an original BQ24781, but the result is the same, why does bq24 refuse to send the signal to close PQB3 when I connect the battery?
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source (1-2-3) et drain (5-6-7-8) : 3,71 MOHMS
source (1-2-3) et grille (4) : (red on source) 8,12 MOHMS, and (red on grille) OL
grille (4) et drain (5-6-7-8) : (red on drain) 12,2 MOHMS, and (red on grille) : OL
I just noticed that the PQB3 mosfet was no longer closed when I plug in the battery, it no longer delivers 20v, I have 16V44 at the output of the PQB4 which corresponds to the battery voltage...Last edited by madjid911; 04-21-2024, 07:54 AM.
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Thank you for this explanation, but where could the problem come from?...
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PJP101 (charging connector adaptater) :
pin 1 : 19V89
pin 4 : 0V (but pqb11 pin 1 acdet : 2V6)
PRB17 and PRB14 : 3V2
PJP202 (charging port battery) :
[B]Broche n° 3 EC_SMB_DA1 : 3V24
Broche n° 4 EC_SMB_SK1 : 3V24
Broche n° 5 BATT_TS : 0V155
Broche n° 6 BATT_B/I : 0V
Briche n° 7 AND 8 : 16V44[/B]
I can't see the battery information because the pc turns off after a few seconds if I connect the batteryPJP101 (charging connector adaptater) :
pin 1 : 19V89
pin 4 : 0V (but pqb11 pin 1 acdet : 2V6)
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no it was just residual current, pin 1 and pin 3 is not connected...Last edited by madjid911; 04-20-2024, 08:22 AM.
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Acer nitro 5 N20C2 No charge
hello I have an acer nitro 5 model N20C2 (motherboard FH51M LA-J871P rev 1B) which does not charge, it turns on perfectly but when I plug in the battery, we see the charging indicator and the charged battery logo but it turns off a few seconds later, and there is no way to turn it back on, you must then disconnect the battery and the charger. If I turn it on without the battery it works fine.
I changed BQ24781 but the result is the same, I put after BQ24800 the same, I then checked all the resistors and mosfets, everything is ok, I bought a new new battery but the result is the same...Last edited by madjid911; 04-20-2024, 09:50 AM.
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Hello, I had exactly the same problem as you, everything was good resistance and voltage (ACDET 2V6, REGN 6V, VCC 20v, ACOK 3V3) but no 20v at the pqb3 and pqb4 output, thanks to you I was able to check everything and repair the laptop, for my part, I had a short on a capacitor, once replaced I had the 20v but the mosfets did not close, after seeing this post, I checked everything like you, I had PB24 poorly soldered (because I had replaced it), there was missing solder on pin 3, after having resoldered it, the laptop loads and turns on correctly.
From what I see in your photo of...
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Yes I just tried a bios here, it works, it remains to be seen if I reset the DMI or not
[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/bios-requests-only/65312-lenovo-thinkpad-l460-type-20fv-nm-a651-bios-main-ec-needed/page4#post3229934[/url]https://Yes I just tried a bios here...equests-only/6...
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BL460 NM-A651
the customer asked the store for the serial number, it would be PF0U0U8B
Can you clean the bios? I tried several bios here it doesn't work...
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