• Toshiba Satellite A500 LA-4991P rev 1.0 nie działa bez baterii

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#1 Toshiba Satellite A500 LA-4991P rev 1.0 nie działa bez baterii


by rager24 12 October 2016, 13:46
Mam duży problem z tą płytą - nie chce działać na samym zasilaczu, nie pali się dioda zasilania. Jak podłączam naładowaną baterię to dioda się zapala i komputer można normalnie uruchomić - baterię ładuje. Oznaczenie płyty LA-4991P rev 1.0
Czasami po dłuższym odczekaniu z podłączonym zasilaniem bez baterii dioda sama się zapala i można komputer uruchomić.

Pomiary bez baterii:

PQ8:
n.1-n3: 18,8V
n.4: 18,8V (powinno być ok 8V)
n.5-n8: 19,3V

PQ9:
n.1-n3: 18,8V
n.4: 18,8V (powinno być ok 8V)
n.5-n8: 6,7V

Brak sygnału ACON: 0,5V
PACIN - 3.4V

PD5
n.1: 0,4V
n.2: 0,3V
n.3: 0,5V (ACON)

PU1
n.1: 3,4V
n.2: 3,3V
n.3: 3,6V
n.4: GND
n.5: 3,0V (powinno być 9V)
n.6: 3,3V
n.7: 0,4V
n.8: 18,0V

Wymieniłem PU1 (LM393) i rezystory: PR18, PR24 i PR26.
Jak podłaczam baterię to na ACON pojawia się 3,4V a na bramkach kluczy jest 8V i B+ ma wtedy 18,8V.

Proszę o pomoc w zdiagnozowaniu usterki, bo męczę się już długo z tą płyta i nie wiem już za bardzo gdzie mam szukać.

Re: Toshiba Satellite A500 LA-4991P rev 1.0 nie działa bez baterii


by Google Adsense [BOT] 12 October 2016, 13:46

#3 Re: Toshiba Satellite A500 LA-4991P rev 1.0 nie działa bez baterii


by rager24 12 October 2016, 14:46
Without battery:

PD4
n.1: 18,5V
n.2: 19,3V

PR12
n.1: 18,5V
n.2: 6,7V

With battery connected there is 19,3V on all pins of PD4 and PR12

#5 Re: Toshiba Satellite A500 LA-4991P rev 1.0 nie działa bez baterii


by rager24 12 October 2016, 15:48
Without battery:

1 0V
3 0V
8 0V
15 0V
16 0V when i disconnect ac adapter it goes to 5V for a moment and then slowly goes down to 0
24 0V

With battery connected:

1 5,10V
3 2,96V
8 2,38V
15 5,08V
16 17,44V
24 19,06V

#7 Re: Toshiba Satellite A500 LA-4991P rev 1.0 nie działa bez baterii


by rager24 12 October 2016, 17:05
Without battery:
3 0,2V
8 1,68V
16 6,7V
17 2,74V

With battery:
3 1,98V
8 3,29V
16 19,3V
17 5,18V

Resistance to ground:
8 780kΩ
17 21kΩ

#9 Re: Toshiba Satellite A500 LA-4991P rev 1.0 nie działa bez baterii


by rager24 13 October 2016, 12:40
Two of them have 994Ω and the third has 992Ω so i think they are good

#11 Re: Toshiba Satellite A500 LA-4991P rev 1.0 nie działa bez baterii


by rager24 13 October 2016, 16:53
With PD5 desoldered voltage on PQ9 pin 4 is 8.2V and on pins 5-8 is 19.3V.
Voltage on PU1 with PD5 desoldered:
1 3,4V
2 3,3V
3 3,6V
4 0
5 9V
6 3,3V
7 5,3V
8 18,5V

I can power on MB now, I have to replace PD5?

#13 Re: Toshiba Satellite A500 LA-4991P rev 1.0 nie działa bez baterii


by rager24 14 October 2016, 10:32
MB displays image properly and the battery is charging. If it is not PD5 then what causes it?

#15 Re: Toshiba Satellite A500 LA-4991P rev 1.0 nie działa bez baterii


by rager24 14 October 2016, 12:59
PQ10
 Pin   With battery   Without battery 
 1-3   19,3V   6,7V 
 4   19,2V   19,2V 
 5-8   12,2V   1,2V 

PQ15
 Pin   With battery   Without battery 
 1   19,2V   19,2V 
 2   0V   0V 
 3(GND)   0V   0V 

PQ17
 Pin   With battery   Without battery 
 1   0V   0V 
 2   3,4V   3,4V 
 3(GND)   0V   0V 

PD11
 Pin   With battery   Without battery 
 1   0V   0V 
 2   0V   0V 


#17 Re: Toshiba Satellite A500 LA-4991P rev 1.0 nie działa bez baterii


by rager24 15 October 2016, 09:19
Voltage on pin 2 of PR12 (shorted) is 19,3V and PD4 is cold

#19 Re: Toshiba Satellite A500 LA-4991P rev 1.0 nie działa bez baterii


by rager24 17 October 2016, 12:51
I replaced PR12, PR14, PR16 I took them from a working MB and it is still the same: 6,7V without battery
Owner of the computer did not want to wait any longer so he took it. I'm locking subject as not solved.

Re: Toshiba Satellite A500 LA-4991P rev 1.0 nie działa bez baterii


by Google Adsense [BOT] 17 October 2016, 12:51

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