No display ACER DAZ8ADMB6D0 REV D

[kalilinux25]

RSMRST# 3.3V
SOC_DRAM_PWROK 1.3V
RTC CLOCK 32.768KHZ PRESENT
Y7 19,2MHZ OK\ Y8 25MHZ OK
DRAMRST# 1.3V

What is my missing wont display on my board?

[stingerchamp]

Re: No display ACER DAZ8ADMB6D0 REV D

Make sure dramrst pin 30 of ram slot is 1.35

Voltage on ram coil and power good
Check cpu_powerok and pltrst#

Have you checked external display

[kalilinux25]

Re: No display ACER DAZ8ADMB6D0 REV D

Make sure dramrst pin 30 of ram slot is 1.35

Voltage on ram coil and power good
Check cpu_powerok and pltrst#

Have you checked external display

Because of very busy I forgot to test the external display it was working I will try to test with a new lcd thanks for informative response sir

[kalilinux25]

Re: No display ACER DAZ8ADMB6D0 REV D

Make sure dramrst pin 30 of ram slot is 1.35

Voltage on ram coil and power good
Check cpu_powerok and pltrst#

Have you checked external display

sir my battery is not charging charging led will just on but not consuming voltages in my becnh supply

BQ24737RGRR (pu8)


PINS NAME OUTPUT

6 ACDET 2.6V
20 VCC 18V
5 ACOK# 0V
8 SDA 3.3V
9 SCL - 3.3V
11 DM# 3.3V
15 LCDRV 0V
19 PHASE 2.7V
18 HIDRV 2.7V
17 BTST 5.9V
16 REGN 6V
1 ACN - 18V
2 ACP - 18V
Is my charging ic dead?

[stingerchamp]

Re: No display ACER DAZ8ADMB6D0 REV D

Measure voltage on all pins of charging ic

Measure voltage on pj6 battery connector
Voltage on acin
Acpress

Check voltage on boot capacitor pc71

Lcdrv low check again

[kalilinux25]

Re: No display ACER DAZ8ADMB6D0 REV D

Measure voltage on all pins of charging ic

Measure voltage on pj6 battery connector
Voltage on acin
Acpress

Check voltage on boot capacitor pc71

Lcdrv low check again

3 -cmpout - 0v
4 cmpin - 0v
7 -Iout - 0V
10- ilim - 0v
12 -srn - 2.7v
13 -srp -2.7v
14 -pgnd - 0v
20 -vcc -18v

PJ6 CONNECTOR
1 -2.7V
2 -2.7V
3 -0V
4 -3V
5 -3.3V
6 - 0V
7 -0V
8 -0V

PC71 from pin 17 5.9 from pin 19 2.7v

[stingerchamp]

Re: No display ACER DAZ8ADMB6D0 REV D

Is it 18v adapter charger?

Acin signal voltage?

Acpress signal voltage?
If ok

Then check pd8 diode it should have voltage at other side,.

In normal case voltage is battery voltage+ regn6v so in your case it should be 2.7v + 6v = 8.7v

Check voltage at pc 57

I-out voltage is zero means something wrong
Check pr149
Check pr14
Check pc63 , pc72 caps for short

Check pd10 zener diode at pj6 mbdata is missing

[kalilinux25]

Re: No display ACER DAZ8ADMB6D0 REV D

Is it 18v adapter charger?

Acin signal voltage?

Acpress signal voltage?
If ok

Then check pd8 diode it should have voltage at other side,.

In normal case voltage is battery voltage+ regn6v so in your case it should be 2.7v + 6v = 8.7v

Check voltage at pc 57

I-out voltage is zero means something wrong
Check pr149
Check pr14
Check pc63 , pc72 caps for short

Check pd10 zener diode at pj6 mbdata is missing

PD8 has same voltage up and lower has 6v checking pc57 voltage it has 6v
also
PR149 no voltage
PR14 no voltage
PC63 is shorted
PC72 is shortted
PD10 is ok no shorted to ground

[stingerchamp]

Re: No display ACER DAZ8ADMB6D0 REV D

Check voltage drop between ACP and phase pins

Check cap outside if still short replace

Check high side mosfet voltage at all pins
Vin is available at hi side mosfet?

Voltage on 2nd DC in mosfet

[kalilinux25]

Re: No display ACER DAZ8ADMB6D0 REV D

Check voltage drop between ACP and phase pins

Check cap outside if still short replace

Check high side mosfet voltage at all pins
Vin is available at hi side mosfet?

Voltage on 2nd DC in mosfet

PQ28 PIN 5 has 18v 1234 has 2.7v pin

[stingerchamp]

Re: No display ACER DAZ8ADMB6D0 REV D

Pq28 pin 5 voltage 18v should pass n channel mosfet and reach via pin 123 to phase

Check resistance between gate 4 and source pins 1,2,3

Voltage difference between ACP and phase?

[stingerchamp]

Re: No display ACER DAZ8ADMB6D0 REV D

Btst pin is +ve input supply for high side mosfet internal circuit opam
So we should have exactly 6v at btst not 5.9

SDA scl has 3.3 voltage but mbdata at pj6 is 0v
If pd10 is ok it so be 3.3v at pj6 pin mbdata

For battery detection check pr129 100 ohm resistance value in ohms it must have been increased

This pin is necessary for correct battery plugin detection

[kalilinux25]

Re: No display ACER DAZ8ADMB6D0 REV D

Pq28 pin 5 voltage 18v should pass n channel mosfet and reach via pin 123 to phase

Check resistance between gate 4 and source pins 1,2,3

Voltage difference between ACP and phase?

pq28 resitance value not shorted

yes phase 2.7v acp 18v

[kalilinux25]

Re: No display ACER DAZ8ADMB6D0 REV D

Btst pin is +ve input supply for high side mosfet internal circuit opam
So we should have exactly 6v at btst not 5.9

SDA scl has 3.3 voltage but mbdata at pj6 is 0v
If pd10 is ok it so be 3.3v at pj6 pin mbdata

For battery detection check pr129 100 ohm resistance value in ohms it must have been increased

This pin is necessary for correct battery plugin detection

PR129 vlaue is 100 correcty

[stingerchamp]

Re: No display ACER DAZ8ADMB6D0 REV D

Replace shorted caps

and pq28

and diode

[kalilinux25]

Re: No display ACER DAZ8ADMB6D0 REV D

Replace shorted caps

and pq28

and diode

I dont have diode sir I just replace the shorted caps and pq28 testing pin 123 has 2.7v pin 4 has 2.7v also

[kalilinux25]

Re: No display ACER DAZ8ADMB6D0 REV D

Replace shorted caps

and pq28

and diode

PJ6 CONNECTOR
1 -2.7V
2 -2.7V
3 -0V
4 -3V
5 -3.3V
6 - 0V to 6v now
7 -0V
8 -0V

[kalilinux25]

Re: No display ACER DAZ8ADMB6D0 REV D

Replace shorted caps

and pq28

and diode

the unit now wont power
5vand 3v is present U22 PPIN 8 NO voltage reading +1.8V_S5

[stingerchamp]

Re: No display ACER DAZ8ADMB6D0 REV D

Sad

Step by step

Check adapter is okay and have 18v present

Check voltage on DC Jack connector available and check voltage on DC MOSFETs available

Then check

Voltage on charging ic pins

Voltage on power button

[kalilinux25]

Re: No display ACER DAZ8ADMB6D0 REV D

Sad

Step by step

Check adapter is okay and have 18v present

Check voltage on DC Jack connector available and check voltage on DC MOSFETs available

Then check

Voltage on charging ic pins

Voltage on power button

\

dc supply showing no amps consuming
3.3v pin 3 of CN7

1-18v
2-18v
6-2.6v
8-3.3v
9-3.3v
11-3.3v
12-2.6v
13-2.6v
16-6v
17-6.4v
18-2.7v
19-2.7v
20 -18v

3,5,7,10,14,15, has 0v