The second board is also defective, but in different way.
Caps lock blink once
Power socket three times white
Power button does nothing, notebook does not turn on, but voltage on power button react correctly
Bios version M74, bios chip replaced, and flashed, still same
[B]+1.05VS - resistance to ground is also 0.3 ohm[/B]. What is typical resistance value for PCH in intel 4. generation for this power rail ?The second board is also defective, but in different way.
Caps lock blink once
Power socket three times white
Power button
jajo17
Member
Last Activity: Yesterday, 11:32 AM
Joined: 08-06-2017
Location: CZ
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The 2nd board arrived for comparison, I haven't tried turning it on yet, measurements showed:
+5VDS - 5V - + 20 Kohm - same
+3VDS - 3.3V - 52 ohm -> 17kohm
+1.05VSP - 0V - 33 Kohm -> ?
+1.05VS - 0V - 0.3 ohm -> same
+3VLP - 3.3V
+1.35VP - 0V - 1K ohm -
3V_PCH - 3V - 11 ohm -> 15kohm
+RTCVCC - 3V
5VS 0V - 12k ohm -> same
3VS 0V - 0.3 ohm -> same
So the PCH in first boards seems to be dead. PQM 1 or PUM1 tooLeave a comment:
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PQM1 possible short-circuit G to S, only 2 ohm. Or bad PUM1. PQM2 has G-S resistance about 1 Mohm. +1.35VP rail.
I ordered another motherboard for compareLeave a comment:
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The notebook still resists, I have made further measurements, please give me further advice.
BIOS chip replaced and new programmed - still same error
Voltages and resistances to GND:[LIST][*]+5VDS - 5V - + 20 Kohm[*]+3VDS - 3.3V - 52 ohm, too low ?[*]+1.05VSP - 0V - 33 Kohm[*]+1.05VS - 0V - 0.3 ohm[*]+3VLP - 3.3V[*]+1.35VP - 0V - 1K ohm[*]3V_PCH - 3V - 11 ohm[*]+RTCVCC - 3V[*]5VS 0V - 12k ohm[*]3VS 0V - 0.3 ohm[/LIST]When injecting 3VS I got up to 4A at about 2.5V, the only thing that was heating up on the board was the CPU[LIST][*]ADP_SIGNAL - 3.4V[*]ADP_A_ID - 2.8V[/LIST]When...Leave a comment:
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Here is some knowledge about ADP_ID_CHK circuit [URL]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/42882-hp-elitebook-8440p-flashes-led-9-times?p=3460914#post3460914[/URL]https://Here is some knowledge about...t3460914[/URL]Leave a comment:
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+1.05 VSP to GND = 0.4 ohms according to my multimeter. I haven't tried removing the connection to +1.05VS by disconnecting jumper PJH1 yet.
I have more details about the motherboard's behavior:
Sometimes, maybe once or twice a day, it behaves more normally, the white LED on the power socket is constantly on, when the power adapter is disconnected and reconnected, it usually fails to repeat and the power socket diode flashes white again for an infinite time.
I measured the voltage on ADP_SIGNAL in both cases:[LIST=1][*]The diode is constantly on = 2.8 V. This corresponds...Leave a comment:
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But this resistance from +1.05VSP to GND can be normal, not sureLeave a comment:
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Another, basic problem found. +1.05VSP short to GNDLeave a comment:
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HP Probook 470 G2 - white blinking - ADP_SIGNAL ?
Hello, I have this laptop with a bad motherboard. The LED in the socket is blinking white, endless loop. According to the information I found on the internet, this can be caused by several reasons that I am currently investigating.[LIST=1][*]Damaged BIOS chip - it seems to be fine, CH341a programmer can read it[*]BIOS RTC voltage shorted to ground - it seems to be fine, around 3V[*]Damaged adapter identification circuit - I think there is a problem here, but please help explain the function[/LIST]What should be the voltage on ADP_SIGNAL when using a 65W HP adapter? My calculation of the voltage... -
Re: Lenovo Idepad 320-15AST - no screen on battery
On battery, when only power led is shinig, then there are these voltages values:
+5VALW, on PJ605, 5,1 V
+3VALW, PJ 602, 3,3 V
+3VL and +3VLP, PJ603 3,3 V
ALW_PWRGD, pin 9 from PU602, always 0V, even when succes boot, open drain output, position PR606 from+3VALW not used, resistance to 3VALW above 1mega ohm. Same on PU 601, seems taht board does not use this signal at all.
APUALW_PWRGD 2,9V on batt, 3V on AC
+APU_CORE, PL2202 0V, then okLeave a comment:
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Re: Lenovo Idepad 320-15AST - no screen on battery
Thank you for your reply.
In the meantime, I found that the laptop doesn't run on battery at all, the screen goes dark, the power button is still lit and the laptop freezes when I disconnect the AC In when it's on. When I reconnect the AC power, it reboots itself (after a non-correct shutdown).
Voltages are (AC In present, batt connected, power off or on have same voltages):
1,2 8,5 V
3 3,3V
4 3,3V
5 0,3V
6 0V
7,8 GND
Voltages are (AC In disconnected, batt connected,...Last edited by jajo17; 03-08-2023, 02:17 PM.Leave a comment:
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Re: Lenovo Idepad 320-15AST - no screen on battery
Here are both batteries on one photo, bottom battery is old, extracted from notebook before repair.
Replacement battery:
Type: 2ICP6/55/90 (L14L2P21), 3968mAh, 7,56V
Old Battery:
Type: L16M2PB1, 4000 mAh, 7,5V
Can be source of problem in wrong battery ?...Last edited by jajo17; 03-08-2023, 06:24 AM.Leave a comment:
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Lenovo Idepad 320-15AST - no screen on battery
Hi everone
I have this craptop. AMD CPU. Motherboard model: DG425/DG525/DG725 NM-B321.
After battery replace (it has wear level 96.5% - no charging at all) and screen replace it seems that this laptop is working, charging. OS installed, driver, bios updated, etc...
But it does not work on battery, it turns on, ON button led and Num Lock led are on, fan spinning after while, but not screen. It's frozen. But if I connect charger then, it starts normally after short while.
I noticed, that replace battery (it is not new, but used, wear level 45%, charging...Last edited by jajo17; 03-07-2023, 08:45 AM. -
Re: Schematics for Lenovo Idepad 320-15AST ?
Heh, I found searching under NM-B321 was enough...Last edited by piernov; 03-07-2023, 12:02 PM.Leave a comment:
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Schematics for Lenovo Idepad 320-15AST ?
AMD CPU. Motherboard model: DG425/DG525/DG725 NM-B321. Anyone ? -
Re: New Members - please post your introductions here
Hi all, I hope that I found here help for some lenovo craptopLeave a comment:
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