Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
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tblazers
Member
Last Activity: 09-29-2023, 04:56 PM
Joined: 06-13-2023
Location: Timaru
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
I have replaced the PUV1 and the short on +5vs is still gone, boot up is still the same quick on and off.
Should I recheck all previous measurements again?Leave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
Removed PUV1 and short on +5VS is gone, will have to order a UP9512QQKI
and see if it worksLeave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
I haven't removed yet, but just wondering why would you expect the GPU to be dead, if i find that PUV1 is faulty how can i confirm GPU health before replacement of PUV1?...Leave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
What's the point of a resistor like this it's like a fuse type wire with such low resistance?
Yes I will remove it tomorrow but
The resistance to gnd is lower on the puv1 side (5ohms),
So either PUV1 or the Cap on the same side, could the badcaps prophecy be fulfilled.. we'll find out tomorrowLeave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
Apologies for not listening to the jedi's fully
But i went on a slightly different route before i removed UQ1. I decided to desolder JPQ2 to isolate the 7 ohm, once +5Vs and +5Vs_out were decoupled the 7ohm disappeared on the UQ1 side, and the 7ohm remained on +5Vs line.
So injected on that line and found that the resistor near PUV1 is warming up (PRV42). But also PUV1 is warming up slightly too
Resistance across PRV42 is 3.4ohm while on board which i think is correct.
Could this resistor be the issue...Last edited by tblazers; 07-12-2023, 05:17 AM.Leave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
Yes correction bottom measurements are for UQ2,
Sounds i wassnt dure 7ohms would be considered a short, but I will inject 1V on the +5vs line.
Is it necessary to remove UQ1 when doing this ?Leave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
UQ1
Pin 9/8 on trigger very quick 3.3V
Resistance to ground >2mohm
Pin 13/14 on trigger very quick 5V
Resistance to ground 7.5ohm
UQ1
Pin 8/9 on trigger 0v
resistance to ground 300Kohm
Pin 13/14 on trigger 0V
Resistance to ground 340ohmLeave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
Thanks,
Interestingly I have
Pin 7 ~365K Ohm
Pin 8 ~1.1M Ohm
Where else could i check in SLP_S3 for a short.Leave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
Thanks for your help
I am getting 13.4 V on the resistor PRM6 on Pin 2, Pin 1 is 19.6 V, this resistor does read 470K Ohm while on board.
seems odd if it is suppose to be 0.08V...Leave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
oh yes correction EC_ON is 3.3V
Okay maybe i wont touch DB2/3/4 for now.
PUM1
ac only
pin7 14mV
on trigger
Pins
7 30mv
8 really quick jump to 1.5-2 V
9 13.4V
11 5.1V
12 5.1VLeave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
I have ~2.8V on Pin one (SPOK_3V5V) side of DB2, DB3, DB4 - and nothing on pin 2 of these diodesLeave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
Ac plugged in
VCC
EC_RST# 3.3V
ADP_I 0V 0V on trigger
VCIN0_PH 2.9V
RSMRST# 0 3.3V on trigger
AC_IN 3.3V
EC_ON 5V
LID SW# 3.1V
SUSP#0V 0V on trigger
SYSON 0V 0V on trigger
PM_SLP_S4 3.3V
PM_SLP_S3 3.3V
What else would be SIO requirement ? sorry still a noobLeave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
With AC only plugged in i have the following on PU2501
Pin 2 - 0V EN_2.5V
Pin 3 - 3.4V VIN
Pin 4 5V VDD
Pin 6 0V 2.5VP
Pin 7 0V FB_2.5V
Not exactly sure what you are asking about on PUM1
I just check a few pins all i have is
Pin 4 20mV VTREF-1.2V
Pin 16 3.5V LX_1.2VP
What else should I have a look at ?Leave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
What would i expect for voltage amount SLP_S5#/SLP_S4# was in a active state?...Leave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
Might not mean anything but when trigger power button i do get a quick
0.5V on pin on pin 2 on RH46 and a ~80mv on pin 1Leave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
"might become true"
So might not become true...Leave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
With AC plugged in and no battery
Confirmed Pin 1 and 2 on RH46 are 0V
Also checked PLM1 for +1.2VP and reads 0v, resistance to ground on the line is approx 160OhmLeave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
Thanks Mon,
Resistance on CPU rail
+19VB_CPU - 200K
+VCC_CORE - 3.5 ohm
RH46 is reading 476ohm
I will have to confirm the voltage again later today.Leave a comment:
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Re: Acer Predator Helios 300 FH52M LA - J891P Rev 1b
Sorry got my S G and D confused,
I do indeed have
19.7V on Drain and 25V on gate, 25V gate for PQB12Leave a comment:
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