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Acer 5741G (Compal LA-5891P) turns off randomly https://vlab.su/viewtopic.php?f=59&t=90664 |
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andromedax [ 29 май 2019, 14:00 ] | |
Заголовок сообщения: | Acer 5741G (Compal LA-5891P) turns off randomly |
Hi, have an issue with an Acer 5741G (Compal LA-5891P) that turns off randomly. Seems that is a temperature problem, but the thermal paste and the heat pipe assembly has been changed. The first boot it is stable 2 minutes or so, then it turns off, since this time it only stays on for 6 or 7 seconds. (sometimes a bit more) All voltages are good and also ddr and cpu have been tested. The weird thing is that it can be in bios setup for more than 2 hours without any problem. (only if bios setup is enter while it is cold enough) Power button circuit is tested and has no problems in it, also ec-bios and pch-bios are good. Can someone give me a hint to solve the issue? |
majemus [ 29 май 2019, 16:03 ] | |
Заголовок сообщения: | Re: Acer 5741G (Compal LA-5891P) turns off randomly |
Is the CPU voltage stable? use an oscilloscope |
andromedax [ 29 май 2019, 19:33 ] | |
Заголовок сообщения: | Re: Acer 5741G (Compal LA-5891P) turns off randomly |
Цитата: Is the CPU voltage stable? use an oscilloscope Yes cpu voltage is stable and has no ripple. (only has the small variations that are normal during boot) I have activated F12 in bios setup in order to select boot device, and when boot, if detects F12, shows the boot menu forever, but if select a device and press enter, it turns off. Regards. |
boiko340 [ 29 май 2019, 20:43 ] | |
Заголовок сообщения: | Re: Acer 5741G (Compal LA-5891P) turns off randomly |
remove battery cmos |
andromedax [ 29 май 2019, 23:11 ] | |
Заголовок сообщения: | Re: Acer 5741G (Compal LA-5891P) turns off randomly |
Цитата: remove battery cmos The cmos battery had been removed at first, and did some test without it, but now it's soldered again. I will remove again and continue the test without it. I have put a password on boot, and it start always asking for the password, and doesn't turns off, only when I write the password and press enter, it turns off. A very weird thing. Hope someone has had this problem before and can help me. Thanks. |
majemus [ 30 май 2019, 10:29 ] | |
Заголовок сообщения: | Re: Acer 5741G (Compal LA-5891P) turns off randomly |
If U9 is installed, raise the 6th pin. If this solves the problem, replace the graphics processor. |
andromedax [ 30 май 2019, 19:15 ] | |
Заголовок сообщения: | Re: Acer 5741G (Compal LA-5891P) turns off randomly |
Цитата: If U9 is installed, raise the 6th pin. If this solves the problem, replace the graphics processor. PU30 is not soldered in the circuit since I started to make the tests, but I have not tested U9. I will try it and post if success or not. Regards. Posted after 2 hours 38 minutes 41 second: hi, majemus I have removed U9 and it works and loads windows. I will put a new U9 and will test. (it's easy than change the gpu) I will let you know the results. |
majemus [ 30 май 2019, 22:25 ] | |
Заголовок сообщения: | Re: Acer 5741G (Compal LA-5891P) turns off randomly |
If you replace the U9, this will not solve the problem. The problem is with the thermal diode of the GPU. When replacing the U9, you will have a thermal effect on the GPU and it will work, but it will not fix it. |
andromedax [ 31 май 2019, 19:36 ] | |
Заголовок сообщения: | Re: Acer 5741G (Compal LA-5891P) turns off randomly |
Цитата: If you replace the U9, this will not solve the problem. The problem is with the thermal diode of the GPU. When replacing the U9, you will have a thermal effect on the GPU and it will work, but it will not fix it. It works ok without U9, but I have ordered a new gpu. I think the new gpu will solve the problem definitely. Thanks for your help. |
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