Acer Nitro 5 Dead

[jasonr2000]

Re: Acer Nitro 5 Dead

With such a high resistance, there is no short on this measured power rail.

thanks for the reply.

any other ideas where to look ??

I know the 3V rail is missing as I can't find it anywhere.

[mon2]

Re: Acer Nitro 5 Dead

With such a high resistance, there is no short on this measured power rail.

[jasonr2000]

Re: Acer Nitro 5 Dead

May be I'm not able to follow up your answers correctly. i asked a simple question-What's the resistance to GND on 3VLP? It should be measured directly on the pin of 3V PWM, so i dont understand this side and that side.

My last attempt to clarify things for you:
01.Set your meter to 20K Scale
02.Measure it directly on 3V LDO pin of PWM-What is the resistance to GND?

hi sorry its my fault for not doing what you asked

so ive set my meter to 20K and it goes to 1 which is over, ive set it on 2000kohms and it stops at 530Kohms

thanks

Jason

[mcplslg123]

Re: Acer Nitro 5 Dead

May be I'm not able to follow up your answers correctly. i asked a simple question-What's the resistance to GND on 3VLP? It should be measured directly on the pin of 3V PWM, so i dont understand this side and that side.

My last attempt to clarify things for you:
01.Set your meter to 20K Scale
02.Measure it directly on 3V LDO pin of PWM-What is the resistance to GND?

[jasonr2000]

Re: Acer Nitro 5 Dead

See attached.

thank you tested and getting the same results

[mon2]

Re: Acer Nitro 5 Dead

See attached.

[jasonr2000]

Re: Acer Nitro 5 Dead

You can look in schematic or datasheet for +3V LP pin of PWM. Its been days and you still cant confirm whether its present or not and its resistance to GND. All suggestions have been given.Where are your follow ups?

3VLP isn't present 0v
and has 99 ohms on one side and 0 ohms on the other if im reading my meter correctly.

can you confirm if im on the right mode on my meter ?? pic attached

[mcplslg123]

Re: Acer Nitro 5 Dead

You can look in schematic or datasheet for +3V LP pin of PWM. Its been days and you still cant confirm whether its present or not and its resistance to GND. All suggestions have been given.Where are your follow ups?

[jasonr2000]

Re: Acer Nitro 5 Dead

Measure the voltage on pin: 2, 9, 11, 12, 17 and 20 PU301. With the motherboard off, measure the resistance to ground at n.8 UH2

pin 8 0n UH2 is 0 ohms

pin 2 = 19V
pin 9 = 0v
pin 11 = 4.06v
pin 12 = 0v
pin 17 = 0v
pin 20 = 0v

[jasonr2000]

Re: Acer Nitro 5 Dead

Post a picture of the LDO. I think I have the schematic of this unit in my paid sub.

sorry for the slow reply guys ive had a busy few days.


I believe this is the LDO

[mcplslg123]

Re: Acer Nitro 5 Dead

If 3V LDO rail resistance to GND is indeed 530 Ohms, then its shorted. the resistance here should be in Kohms. Very likely a shorted EC.

[Roti]

Re: Acer Nitro 5 Dead

Measure the voltage on pin: 2, 9, 11, 12, 17 and 20 PU301. With the motherboard off, measure the resistance to ground at n.8 UH2

[mon2]

Re: Acer Nitro 5 Dead

Post a picture of the LDO. I think I have the schematic of this unit in my paid sub.

[jasonr2000]

Re: Acer Nitro 5 Dead

The 3v3 LDO is often a local rail on the same controller IC. Being a ldo, usually the current support is low to power a small circuit.

If this LDO rail is not active, check the enable pins for this controller and their voltage to ground. Share the part markings of this regulator ic so we can check the datasheet. Also check the resistance to ground of the non-working voltage rail(s).

ok I've found 3v3 LDO and its showing nothing.

in ohms mode it says 530 ohms

I can't read the chip sadly its soo small.

[jasonr2000]

Re: Acer Nitro 5 Dead

I have 4.5v on ENLDO 3V5V is that the correct rail ??

[mon2]

Re: Acer Nitro 5 Dead

The 3v3 LDO is often a local rail on the same controller IC. Being a ldo, usually the current support is low to power a small circuit.

If this LDO rail is not active, check the enable pins for this controller and their voltage to ground. Share the part markings of this regulator ic so we can check the datasheet. Also check the resistance to ground of the non-working voltage rail(s).

[jasonr2000]

Re: Acer Nitro 5 Dead

I didnt ask for 3V ALW. You need to look for 3V LDO(+3V LP).

hi again +3V LP isn't there I don't have a 3V LDO ??

[mcplslg123]

Re: Acer Nitro 5 Dead

+3V ALW isn't there.

I didnt ask for 3V ALW. You need to look for 3V LDO(+3V LP).

[jasonr2000]

Re: Acer Nitro 5 Dead

+3V ALW isn't there.

[mcplslg123]

Re: Acer Nitro 5 Dead

Locate the 3V PWM and check for +3V LDO present or not