Dead acer 7750g

[Techtiger]

Re: Dead acer 7750g

I think yes. At the 24pin I have the 5.00V

not correct check again for the voltage find out pin 23 it should be 3.3V if this voltage present you can move on

power BTWN connector voltage on pin 2 5 6?

D21 voltage on 3 pins ?

EC pin 32 9 67 117 116 102 37 100 101 65 98 109 127 voltage with out pressing PTWN and with pressing PTWN on by one dont short the pins red probe end must be sharp

[giulio93]

Re: Dead acer 7750g

not correct check again for the voltage find out pin 23 it should be 3.3V if this voltage present you can move on

power BTWN connector voltage on pin 2 5 6?

D21 voltage on 3 pins ?

EC pin 32 9 67 117 116 102 37 100 101 65 98 109 127 voltage with out pressing PTWN and with pressing PTWN on by one dont short the pins red probe end must be sharp

Pin 23 of PU3 (SPOK in my board view) is 4.96V.

Power BTWN is the on/off button connector (JLED1)? If yes the readings are: 3.27V, 17.93V, 0V.

D21 (1-2-3): 17.94-3.28-18.24

U21 (no pressing PTWN):3.28-3.3-3.3-3.3-0-3.29-0-3.3-0-3.27-3.27-3.14.
The pressign on on/off has to be short,long or just the time for the mesuring?

[Techtiger]

Re: Dead acer 7750g

Pin 23 of PU3 (SPOK in my board view) is 4.96V.

Power BTWN is the on/off button connector (JLED1)? If yes the readings are: 3.27V, 17.93V, 0V.

D21 (1-2-3): 17.94-3.28-18.24

U21 (no pressing PTWN):3.28-3.3-3.3-3.3-0-3.29-0-3.3-0-3.27-3.27-3.14.
The pressign on on/off has to be short,long or just the time for the mesuring?

for PU3 SPOk is fine it pulling down from VL VREG5 , what is the voltage on PQ29 all pins writ down correctly pin 1 voltage ? example

[Techtiger]

Re: Dead acer 7750g

Pin 23 of PU3 (SPOK in my board view) is 4.96V.

Power BTWN is the on/off button connector (JLED1)? If yes the readings are: 3.27V, 17.93V, 0V.

D21 (1-2-3): 17.94-3.28-18.24

U21 (no pressing PTWN):3.28-3.3-3.3-3.3-0-3.29-0-3.3-0-3.27-3.27-3.14.
The pressign on on/off has to be short,long or just the time for the mesuring?

for U21 write down the voltage with the pin number ,as you press the power BTWN note the voltage on by one

[Techtiger]

Re: Dead acer 7750g

Pin 23 of PU3 (SPOK in my board view) is 4.96V.

Power BTWN is the on/off button connector (JLED1)? If yes the readings are: 3.27V, 17.93V, 0V.

D21 (1-2-3): 17.94-3.28-18.24

U21 (no pressing PTWN):3.28-3.3-3.3-3.3-0-3.29-0-3.3-0-3.27-3.27-3.14.
The pressign on on/off has to be short,long or just the time for the mesuring?

for D21 pin 3 gets 18.24V from Q1 , check Q1 with out battrey all pin voltage ?

Is the RTC section is fine ?

[giulio93]

Re: Dead acer 7750g

for PU3 SPOk is fine it pulling down from VL VREG5 , what is the voltage on PQ29 all pins writ down correctly pin 1 voltage ? example

At pq29 I have: 1-19.38V , 2-3.49V, 3-19.38V

[giulio93]

Re: Dead acer 7750g

for U21 write down the voltage with the pin number ,as you press the power BTWN note the voltage on by one

The order I follow to write the voltages follow your sequences.
PIN - V Power on not pressed
32 - 3,28
9 - 3,30
67 - 3,30
117 - 3,30
116 - 0
102 - 0
37 - 3,29
100 - 0
101 - 3,30
65 - 0
98 - 3,27
109 - 3,27
127 - 3,14
The only one who changes pressing the power botton is pin 32 and went to 0,44V

[giulio93]

Re: Dead acer 7750g

for D21 pin 3 gets 18.24V from Q1 , check Q1 with out battrey all pin voltage ?

Is the RTC section is fine ?

What is Q1? What is the RTC section?

[Techtiger]

Re: Dead acer 7750g

for D21 pin 3 gets 18.24V from Q1 , check Q1 with out battrey all pin voltage ?

Is the RTC section is fine ?

Trying misstake PQ1 find out any short on PQ1 circuit PR3 PR4 , For RTC section (real-time clock ) check the voltage RTCVCC PCH_RTCRST# PCH_SRTCRST# if any short set dead
chek the voltage on Q23 all pins , short (on/off) pin 32 of EC ON/OFF to GND be care full and see for any changes

[Techtiger]

Re: Dead acer 7750g

The order I follow to write the voltages follow your sequences.
PIN - V Power on not pressed
32 - 3,28
9 - 3,30
67 - 3,30
117 - 3,30
116 - 0
102 - 0
37 - 3,29
100 - 0
101 - 3,30
65 - 0
98 - 3,27
109 - 3,27
127 - 3,14
The only one who changes pressing the power botton is pin 32 and went to 0,44V

EC no reaction for PBTWN pin 32 must go to 0V# pin 100 pin 117 ect ,

[giulio93]

Re: Dead acer 7750g

Trying misstake PQ1 find out any short on PQ1 circuit PR3 PR4 , For RTC section (real-time clock ) check the voltage RTCVCC PCH_RTCRST# PCH_SRTCRST# if any short set dead
chek the voltage on Q23 all pins , short (on/off) pin 32 of EC ON/OFF to GND be care full and see for any changes

PR3 and PR4 are not shorted to ground.
RTCVCC is 2,98V
PCH_RTCRST is 2,98V
PCH_SRTCRST is 2,98V so I supposed none of 3 is shorted (instead I should get 0V, isn't it?)

Q23
1 18,24V
2-3 0V.
I don't understand the shorting pin 32 part

[Techtiger]

Re: Dead acer 7750g

PR3 and PR4 are not shorted to ground.
RTCVCC is 2,98V
PCH_RTCRST is 2,98V
PCH_SRTCRST is 2,98V so I supposed none of 3 is shorted (instead I should get 0V, isn't it?)

Q23
1 18,24V
2-3 0V.
I don't understand the shorting pin 32 part

pin 32 of EC is connected to PWRBTWN for test you can ground this voltage as a switch on/off

[Techtiger]

Re: Dead acer 7750g

PR3 and PR4 are not shorted to ground.
RTCVCC is 2,98V
PCH_RTCRST is 2,98V
PCH_SRTCRST is 2,98V so I supposed none of 3 is shorted (instead I should get 0V, isn't it?)

Q23
1 18,24V
2-3 0V.
I don't understand the shorting pin 32 part

i have a doute on PR3 PR4 100k 22k what is the supply ?

[giulio93]

Re: Dead acer 7750g

pin 32 of EC is connected to PWRBTWN for test you can ground this voltage as a switch on/off

Ok I'll try. What should happen?

[giulio93]

Re: Dead acer 7750g

i have a doute on PR3 PR4 100k 22k what is the supply ?

I don't understand the question, sorry

[Techtiger]

Re: Dead acer 7750g

I don't understand the question, sorry

test PR3 PR4 with the multimetre with out power resistence 100k 22k or not after note the voltage PR3 pin 1.2 / PR4 pin 1.2

[Techtiger]

Re: Dead acer 7750g

Ok I'll try. What should happen?

see if any voltage change post #27 pin 117 100

[giulio93]

Re: Dead acer 7750g

test PR3 PR4 with the multimetre with out power resistence 100k 22k or not after note the voltage PR3 pin 1.2 / PR4 pin 1.2

they are exactly 100K and 22K

[giulio93]

Re: Dead acer 7750g

see if any voltage change post #27 pin 117 100

nothing happens

[Techtiger]

Re: Dead acer 7750g

nothing happens

after some research for Acer MB this is normal its 51on logic on power switch 19V , TEST AGAIN D21 short pin 2 & 1 to see any changers on pin 117 100 in EC
U35 voltage on all pins did you flash BIOS ? any led lights up in the MB ?
U39 U35 U4 voltage on all pins resistance to GND pin 123 all 3 IC with out power note separately