HP x360 1030 G2

[sauce]

Hi,

I have this laptop HP x360 1030 G2.

Battery is charging well, the laptop powers on the CPU gets warm but nothing on the internal screen or hdmi.

The fan is spinning at full speed.

Any idea ?

I just asked for a schematic i cannot find it.

[mon2]

Carefully measure the voltage to ground of each inductor on the board. Usually they are grey in color and will be with 2 leads. Checking for any 0 volts or lower than normal voltage on such parts. Each inductor is linked to a local buck regulator that will be used to lower the high power adapter voltage.

[sauce]

Absolutely no short nowhere.

But a very strange thing around the BQ2480S (the battery charges fine) the voltage on BATPRES is alway 0V even if I unplug the battery !
I measure resistance of pin 15 (BATPRES) to ground and I have 0 ohm, is it normal ?

[mon2]

Yes, some designs hard strap this pin.

What is the history of the laptop?

Tested with a reflashed bios?

Each inductor has a proper voltage to ground?

Carefully measure the voltage to ground of ACOK pin #5 on the BQ charger IC which should be a logic ‘1' if the power adapter is ok.

[sauce]

I bought it to try to repair it for a friend.

Yes ACOK is good but still very strange thing around this BQ27480S chip (i replace it still the same).

The logic board is alone without battery only ac adapter (nothing connected at all only ac adapter and cpu fan).

I measure voltage of REGN of BQ chip. When I plug AC adapter this pin is 5.7V but one the laptop starts (fan spin) this pin goes to 18V and back to 5.7v then goes to 18v etc... !

Only with charged battery connected REGN is 12.38V !

[sauce]

I would like to try a bios flash but which chip is it ?
I have a W25Q128.. and a MX25l6473fz.

[sauce]

Sorry about REGN I think I measure the wrong pin.

But something very strange is that bq chip seems to charge battery even if battery is not connected.

[mon2]

If your meter probes are suitable for fine pin probing, carefully measure the voltage to ground of each pin on this charger IC with the adapter and battery connected.

Post the table of values with their PIN number / label.

[sauce]

I will do that.

The voltage on battery coil goes up and down when battery if not connected.

For now I desoldered W25Q128 chip to read it. Do I need to do something before I put back (I have no adapter so I read it by soldering wire on the chip but can read it without any problem).

[sauce]

Ok so here are the DC voltages to ground on BQ24780S AC adapter plugged and battery plugged too. Laptop OFF.

1 - ACN : 19.54V
2 - ACP : 19.55V
3 - CMSRC : 19.54
4 - ACDRV : 25.4V
5 - ACOK : 3.32V
6 - ACDET : 3.40V
7 - IADP : 190mV
8 - IDCHG : 0
9 - PMON : 0
10 - PROCHHOT_L : 131mV
11 - SDA : 3.28V
12 - SCL : 3.28V
13 - CMPIN : 0
14 - CMPOUT : 0
15 - BATPRES_L : 0
16 - TB_STAT_L : 0.255V
17 - BATSRC : 13.16V
18 - BATDRV : 13.15V
19 - SRN : 13.16
20 - SRP : 13.17V
21 - ILIM : 3.31V
22 - GND : 0
23 - LODRV : 0.875V
24 - REGN : 6.03V
25 - BTST : 18.86V
26 - HIDRV : 15.49V
27 - PHASE : 13.17V
28 - VCC : 19.13V

[mon2]

10 - PROCHHOT_L : 131mV

this signal is active…meaning the processor is considered to be too hot.

[sauce]

This signal comes direclry from CPU ?

[piernov]

Signal won't come up when the laptop is off… why diagnose charging circuit when battery charges, laptop turns on but (probably) doesn't complete POST?

[sauce]

Yes but someone could confirm this laptop is working only on AC adapter ?

Because why battery coil has a pulsing voltage when no battery is connected ? Even the BQ chip is pulsing.
There is also a 10 ohm resistor very hot (nearly 90°C). This resistor is connected to the + of battery terminal and is in series to a capacitor. The other end of the capacitor is connected to GND.
This resistor is pulsing too.

Another thing when I plug a HDMI cable and start laptop I can see resistors near the HDMI connector pulsing too.

Quite difficult without any schematic

[sauce]

Some pictures of resistor + capacitor quite hot.

[sauce]

Hi,

After hard days of research, I found something very interesting.
I measure chip Intersil ISL95859A :

So VR_ENABLE was OK, VR_READY ok too but ALERT# was LOW.

Based on schematic of HP 840 G6 which has the same chip and after long long time to trace the lines, I finally found the resistor and the pin of SVID ALERT CPU side.

So each side of this 220R resistor it was 0V so I desolder this resistor to isolate each side. Still 0V on the two pads ! Very strange because on one side there is a pull up resistor to 1V.

So I desolder ISL95859A chip and re-solder the resistor and now I have 1V on both sides of the resistor (so without ISL chip).

So CPU now sends ALERT signal, isn't it ?

The ISL chip seems to be dead. What do you think ?

And the last thing is ISL95859AHRTZ (chip on board) is 100% compatible with ISL95859CHRTZ ?

I hope it's a dead ISL chip !

[Sephir0th]

Normally this means, that the VRM section is up and awaiting instructions from the CPU, which obviously are not send. I have seen dozens of devices with same behaviour and had to conclude all of them being a dead CPU.
I've heard of some cases where indeed the Controller is the culprit, so you can try that out but afaik this is really rare.

[sauce]

I replace the ISL chip with no success

Just for information can we copy EC bios to another motherboard without any editing ? I bought other dead motherboards and I have one repaired.
So can I copy EC.bin bios from the working board to another ? Is there something in the EC bios that is related to specific motherboard ?

[mon2]

Which part was used for the replacement? The 2 parts do not look to be replacements for each other based on this note:

General PLC Notice (digikey.com)

Remain with the ISL95859AHRTZ as found on the original if replacing this part.

[sauce]

I took ISL from another board with vcore present.

With this other board I am trying to repair here all voltages are present but after a moment all secondary voltages restart (go to 0 then ok).

On this board there are two big coils. Is it vcore for both ? Because there is no voltage on the second coil.