Re: Clevo 6-71-N85L0-DE2 N850EL Schematic
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HP Envy 15-W x360 448.04805.0021 Intermittent Boot
I've got this board to repair, it is intermittent to boot. If you leave it without power for about a week then it will boot first time but not again unless you leave it. It really needs a few days, overnight is not enough for it to reset!!!
I've reflashed the bios with the latest .bin by removing the IC, but get the same result as with the original BIOS.
I noted that when I attach power for the first time after leaving the board unpowered I get 7 white flashes on the charge LED (no battery attached, literally the motherboard with some RAM on the bench, connected to...
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Asus FX505DD Rev: 2.0 EC Bios
Replaced the IC as it was shorted and now it needs programming, does anyone have a working EC BIOS?
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Asus TUF FX505DT FX505DD V2 M/B
Hi,
Just replaced a shorted IT8987E, so now I have 5V and 3V3. Does this part need reprogramming or does it get programmed from the BIOS?
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Re: Acer A314-31 (Z8P) No Power
PQ6
D 19.28
S 19.28
G 9.53
PQ17
D 2.78
S 19.14
G 19.08
PQ16
pin 1 19.19
2 19.19
3 19.27
4 9.53
5 0V
6 0V
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Re: Acer A314-31 (Z8P) No Power
Nothing appears shorted, unless it's the IT8987E/CX AC_Protect line
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Re: Acer A314-31 (Z8P) No Power
Pin Voltage
1 19.12
2 19.17
3 11mV
4 0V
5 2mV
6 2.78V
7 0V
8 3.38V
9 3.38V
10 0.813V
11 3.38V
12 2.77V
13 2.77V
14 0V
15 0V
16 6.09V
17 5.92V
18 2.77V
19 2.77V
20 18.65V
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Re: Acer A314-31 (Z8P) No Power
Vin = 19.12V
ACok = 1.7mV
Did some measuring around, gate of PQ20 is 2.78V which is the same as BAT-V but the gate and source aren't shorted when the board is unpowered.
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Acer A314-31 (Z8P) No Power
I have one of these in for repair, initially found that the 5V regulator had a shorted output that caused the DC adapter to go into protection mode.
Replaced the 5V reg and now I get 5V and 3V3 ok but pressing the power button (well shorting the pins on the keyboard connector) does nothing. I get no lights at all.
I noted that the battery was completely flat, with that removed I only get 2.7V on the battery connection. I thought that would go to the battery max charge voltage?
If I do connect the battery (even flat). I get the orange charging light,...
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HP Pavilion 15-CS0021 Goosed PCH?
I've been chasing a short around the motherboard, finally located a dead short on the 3vs5 rail. Checked the caps at the reg output, all ok out of circuit.
I isolated the output of the reg and put 1V in, 4A draw but nothing really obvious gets hot but after a minute or so the PCH start to get warm.
Without a thermal camera I'm kind of stuck, is it likely to be the CPU? It doesn't get very hot, probably about 30deg but then again there is only 4W draw.
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Re: Chip ID 2N 3D R2P Asus X556
That's the one! Thanks a million...
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Chip ID 2N 3D R2P Asus X556
The board exhibits no power, but draws 200mA. The input MOSFETs are fine but the above device gets hot and I note that 3.3V is only 0.6V.
There is a short on the R2P IC, as a cap is showing short in circuit and is fine out of it, whilst the short is still present.
I assume it's some sort of regulator but I cannot work it out and without a SCH I'm a bit lost.
TIA
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