Hi, all
LA-L191P BQ24781 signals pin 28 -> 19V [VCC], pin 5 -> 3.3V [ACOK] pin 6 [ACDET] 2.6V, pin 24 -> 5.3V [REGN], pin 25 -> 5.3V [BTST] ,
missing +3VLP -> EC -> signals for manage BQ24781. In the power sequence the +3VLP is the first signal in AC mode.
I presume that the bios is working because one time the motherboard generate +3VLP and goes ON but after a shutdown the situation
came back to no power on -> no main 19V. The question is: who generates +3VLP which is the basis of all other signals?
Every time with the BQ24780S it's like...
jasko_jacker
Badcaps Legend
Last Activity: 03-05-2026, 09:48 AM
Joined: 10-01-2014
Location: roma
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It depends on which chips you solder and with which configuration of the soldering machine. This software allows you to use the pc410 controller together with the c100 with a more user friendly configuration. If you have a soldering station with these two controllers you can benefit from it above all because you have a complete view of the profile. Obviously when setting the profile you must take into account the real power of the heaters because if you ask for too much the curve in relation to the time is not respected, this especially if you do not use air but diffuse infrared. The use of increasingly... -
if you need it for Asus systems, there is a DDR2/3 card (which can also be connected to the DDR4 via cables) and now also DDR4 which uses the RAM port, see www.bvg-group.ru (I don't know if they still exist) while to use the jdebug port there are many devices that are fine but you have to solder the cables or create a connector. they are only useful if the bios works and hangs on a specific code they are not like a jtag system...
Last edited by jasko_jacker; 07-20-2024, 06:37 AM.Leave a comment:
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1.2 Ohms may be few but you also need to understand how accurate the reading is. I would try installing a rebuilt bios.Furthermore, to understand the situation well, all the signals should be checked following the power sequence list or use the jdebug port. I have found myself in situations where the CPU was damaged and the card was not powered,...Leave a comment:
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There could be many causes, however I would check the PCH (the fact that it doesn't heat makes me think that the card doesn't post) and I would check the voltages of the two lines on the battery connector and if the ITE receives power. If there are no obvious shorts and these voltages are present I would try reprogramming the bios. Obviously a professional repair has a different approach.......
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Have you a boardview ? without the boardview it is very difficult to look for a solutionLeave a comment:
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We are doing these tests to understand for sure if the problem comes from the GPU. From what you write it seems that the GPU has some problems that affect the chip itself. I asked if the 1.5V voltage was present to partially understand the state of the video memory and the ohms to understand if there had been a short on the power supply line. It's strange that both the voltage and the resistive value are correct. There is a great possibility that the only solution is to replace the graphics chip however it would be worth carrying out further tests.Leave a comment:
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When there is a short on the 19V drop resistor it is a good rule not to inject the 19V because if a mosfet of the CPU voltage line is damaged it could happen that all the 19V go to the CPU, if we burn it it also depends on the amperage as well as on the voltage. If you think something similar has happened you need to measure the ohm value on the CPU line. It may happen that although there are apparently no problems, the CPU may be damaged. You understand this because usually the chip that manages the 19V does not supply it, probably being blocked by a powergood signal.Leave a comment:
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bt.exe returns an error because the command must follow a specific syntax. However, if there is an official solution, that's betterLeave a comment:
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if you can't find the boardview you have to do a whole search for each IC to understand the most important points of the circuitLeave a comment:
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It could also be about RAM voltage. As for the pch, it measures the resistance of the components above it. Also I read a coil with o ohm but with a voltage, is it an error? The only coils with a low ohm value are the GPU and CPU voltage line. Check if there is 3.2 V on the battery connector and on the ec. I assume that you have already attempted to reprogram the biosLeave a comment:
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Usually with the behavior you described the problem is not solved via software. You first need to figure out which GPU-related component is damaged and it's likely the chip itself that is damaged....
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I think if it works correctly in safe mode then you will probably see the dedicated video card driver either with a warning (like an exclamation mark) or in the case that the video chip is not detected, you will not see any driver. However, if the driver is present, disable it without deleting it, also check what type of driver the integrated card is managing (generic?). With the driver disabled it should also start in normal mode.Leave a comment:
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Some of these chips are self-programming, while others need to be programmed. However, the self-programming chips may only do so if they are empty. If they are not empty, they might not self-program. Nevertheless, even an older version like Vertyanov 2.x should be sufficient to manage this type of chip. You can find more information on the dedicated Vertyanov programmer forum.
https://*******/viewtopic.php?f=170&t=15912&start=3510Last edited by jasko_jacker; 07-03-2024, 09:13 AM.Leave a comment:
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Use only chip branded lenovoLeave a comment:
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In these cases, it is not easy to pinpoint the exact issue regarding the GPU. If you truly believe it is the GPU, you should start by checking if the memory has the correct voltage and if the GPU has the proper resistance value in ohms.Leave a comment:
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Have you tried starting Windows in safe mode with the GPU drivers disabled?Leave a comment:
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have you tried reprogramming the bios, have you checked whether you have the same problem with the external screen?Leave a comment:
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I am waiting for someone who can confirm that the low ohm value (< 1 ohm) of the i7 10750h CPU power supply line is normalLeave a comment:
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For anyone interested, I can confirm that the problem on the ROG was the CPU, replaced now the card works correctly. Also compliant that the it8225vg, although it should self-program on this card, does not happen and must be programmed with vertianov or svodLeave a comment:
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