Re: MacBook Pro working only with HDMI pluged in!!??
If this helps......
Frenk7
Member
Last Activity: 04-30-2019, 03:06 AM
Joined: 01-15-2019
Location: Zagreb
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Re: MacBook Pro working only with HDMI pluged in!!??
Sorry for not replaying......Leave a comment:
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MacBook Pro working only with HDMI pluged in!!??
I have MacBook Pro A1502 that was in contact with liquid on the keyboard side. I found that keyboard backlight connector is burned so i pluged it out and cleaned connector on motherboard side. Present state is next: when i turn on laptop after 1-5 minutes screen freezes, but the strange part is that if i plug in second monitor on HDMI port, both monitor and laptop screen work and nothing is freezing. Can you please help me?
I am thinking that there are two circuit or two ic. When i plug in second screen second line (that was not affected by burned keyboard backlight) takes over and all... -
Re: Acer Aspire 5742ZG working on battery only!
Yes, boardview is mirror image, but on boardviewer software on view, you can flip board. The problem was that pq77 mosfet, i replaced it and now laptop is working fine.
Thanks for your help!Leave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
I think it is a graphic issue, i don't know if it was like this before, but now when i start the laptop i get white screen (see the 1. photo) and then normalno screen telling me i have no hard drive and the picture stays normal, if i plug in the charger that weird issue starts (see other photos)...Leave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
I use this, it is free
[url]http://boardviewer.net[/url]Re: Acer Aspire 5742ZG working on ba...ewer.net[/url]Leave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
I was looking at the board and i think i found something (look at the pictures). Mosfet is not shorted to the ground but i think it is not good. And it is on VGA rail so maybe that is my problem with screen...Leave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
Now on Pin1 i have 3.14V. I am sorry to say, but someone has clean the motherboard and i can't also see where was the damage, i only see a bit on vent...
Here are the pictures, they were taken with cellphone......Leave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
Ok, here is follow up on my problem. I found that PR296 resistor is not 10k but 80k, after replacing it i finaly have 19V on PQ52 and 19V, 5V and 3.3V powers rails
. But that would be to easy, now i have new problem.
When i power it up with battery it gives me charging light, but after some time screen gets dots and start download flicker, white line appears. It all disappears when i pull put the charger.
If i start the laptop on charger only i get strange white Linea on top and black on the bottom od the...Leave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
But i don't knew if i can have 19V on DCIN...Leave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
Here is what i would like to do, i would like to jump pq52 so i have 19V, 5V and 3.3V and also make jumper on PQ54 like on pictures so i have DCIN on pu17Leave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
It is not clear to me, why i have Voltage drop on pq51 from 19.18V to 18,89V, and i have tried to change pq52 whit a New one and the same problem, 8.3V on output. Those two mosfet should be there for passing full 19.18V if they get signal on pin 4 (gate). Am i right?Leave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
PC213:
P1-18,41V
P2-0.0V
PU18:
P1-0.03
P2-3.26
P3-3.52
P4-gnd
P5-3.9-4.2
P6-3.23
P7-4.2-4.7
P8-18.46Leave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
I mean to say, i haven't see anything wrong with this schematicLeave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
Yes, it is, but motherboard is NEW70 LA-5891P
Rev : 1.0, and i haven't anything wrong with schematicLeave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
Here is schematic and boardview, if someone don't have it. Thanks, all help is appreciated...Leave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
I don't see pd18, i have pc252 and pq54 on DCIN.
And on PQ54 i have:
Pin 1 - DCIN: 0.055V
Pin 2 - N47340532: 8.3V
Pin 3 - P3: 8.3V...Leave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
I am looking at page 8 and i see that my voltage readings are all off, but i think that is because i don't have good input voltage. Am i right?Leave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
ok, techtiger here are voltages:
PQ51 PIN 4: 18,69V
PQ52 PIN 4: 18,69V
PQ65 ACON: 0.030V
ACOFF: 0.00V
PR371 PACIN: 0.030V
ACON: 0.000V
The measurement are taken with both mosfet PQ51 and PQ52 soldered back onLeave a comment:
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Re: Acer Aspire 5742ZG working on battery only!
First pictures with voltages of charging ic:...Leave a comment:
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