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Thanks a lot!...
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Re: No Display - ACER A515-51G LA-E892P REV 1A
I'm having exactly the same problem. In my bench, I have one of these, and was completely dead. After changing about 3 shorted MosFets, the MoBo start responding. Fan on, lights on, charging, etc., but no video (no LCD and no HDMI out, even disconnecting the internal LCD before appliyng power). All GPU voltages are Ok, same as CPU, and both are normally hot.
I'm working now on it. If I find some solution, I will give you here the feedback.
I observed that the EC is slightly warm, so I will...
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Re: iMac A1311 extrange behaviour
Indeed. Not for the small ICs, but that's for all chips with a “PCB” as base. They didn't support too much heat for long time. The same with microprocessors.
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Re: iMac A1311 extrange behaviour
Reformatt, Jhkh et all: thanks a lot for your comments. I was afraid of the same. That’s the reason why I have done a full reballing, not a reflow. Last week I refused to repair another laptop due to a curvature in the microprocessor. Impossible to reball a component with 0,4 mm balls with a higher curve in the center.
Anyway, the behavior is really extrange, because in spite it will fail as time passes, now is working. Maybe it fails when the system loads some kind of video resource…
Anyway, thanks again....
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Re: iMac A1311 extrange behaviour
...maybe you mean "no; you think it's fixed, but it is not...video is still the problem"?....
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Re: iMac A1311 extrange behaviour
Sorry? Are you joking me?. All the repair works here have a warranty of 6 months. The law says 3 months, but we give 6.
I am being serious, I'm not joking. The pink bars dissapeared after doing a full reball in the (terrible) VGA card (I mean, VGA chip).
Must I understand that piernov is saying "no" to this part of the repair?. Maybe he's saying that video card is still giving me problems?.
As I said before, I never found a Mac which wasn't enable to start up from an external...
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Re: iMac A1311 extrange behaviour
Sorry, piernov. What do you mean with "no"?.
Thank you....
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iMac A1311 extrange behaviour
Hello colleagues:
I have in my bench an Apple iMac A1311 (21,5¨), which is driving me nuts.
The machine starts when you push the power, the chime sounds, the Apple logo appears, even the progress bar appears, but when the bar is around the 40% , the machine goes black and restarts by itself. And this is a loop.
Things that I've made:
-The screen presented pink vertical bars. I have done a VGA chip reballing. Succeed. No bars. Clean screen at startup. This problem is solved.
-PRAM resetted. Same results.
-RAM checked and sockets...Last edited by fichamba; 02-11-2023, 07:46 AM.
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Re: hp 15-a0007nx LA-G07DP schematics
Thanks a lot, zameer, and happy new year!.
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Re: la-G07DP Rev.3.0 bios dump,no vcc core
Thanks a lot, and happy new year! ...
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Re: lenovo nm-a273 schematic needed
Thanks a lot, Sunil Patel.
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Re: 820-3023 schem and boardview required
Thanks for sharing.
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Re: Macbook A1708 / 820-00840-A / Can't find IC on schematic neither boardview
I am having just now exactly the same problem: the PCB says 820-00840-A, but the boarview file does not show the above mentioned IC. And it's fried.
Thanks a lot for your help. I really appreciate it.
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Re: Component identification help
image...Last edited by SMDFlea; 07-25-2022, 03:02 PM.
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"short killer pro" Component identification help
Hello friends,
I have a device called "short killer pro". It becomed damaged. Now, after changing 4 ICs it is working again, BUT I don't have neither voltage and intensity reading in the front display (the adjustments are working fine both for V and A, but there is no indication, as I said before). I did not find out any firmware update for the Altera microcontroller it uses (the rest of the functions are working, but the buzzer, for example). And I am suspecting about this IC, but I am not able to decipher which one it is. I see it is from Texas Instruments, but nothing...
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