Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
Announcement
Collapse
No announcement yet.
User Profile
Collapse
-
I am not a bios expert but as many have seen, the guide in question is no longer applicable on many Asus models. For example, Asus provides files that appear to only need to be changed in size but which are actually encrypted. The model on which the guide is based is now many years old and many things have changed
-
-
probably an inductance or resistance (perhaps 0 ohm) is missing, I can't see well from the image but check if the point circled in red is shorted
Leave a comment:
-
It seems that your model does not have a dedicated graphics card, everything points to a problem with the graphics card integrated into the processor or a problem of lack of contact of some balls under the processor. Without tests it is not easy to make an accurate diagnosis. I don't think it's a BIOS problem
Leave a comment:
-
Remember to follow carefully what I wrote especially about removing the drop resistance see #6
The purpose of this test is to verify, by bypassing the IC that manages the charging and power management mosfets to verify that the system has no other problems, in 90% of cases this type of test works by just making the connection as per diagram #6 other times it is necessary to make changes. Check that the 19V line is not shorted and do the test I recommended, then based on the result you will understand whether the problem is limited only to the charging IC or there are (as I suspect) other...Last edited by jasko_jacker; 01-25-2024, 09:33 AM.
Leave a comment:
-
I hope it is a permanent repair, often it is not a problem of lack of contact between the balls and the motherboard but an internal problem with the chip that could recur. However, as long as it works...
Leave a comment:
-
I have noticed that usually when an IC like the bq780s or similar does not enable the mosfets of the 19V line even if all the signals are in order, there is no attempt to understand if the communication with the host is correct. This problem is more common than people think. I understand that a logic analyzer is needed but even a low-cost one is enough.
Leave a comment:
-
If indeed all the voltages are correct and the "power sequence" is respected then I would rebuild the old bios by doing a "clean me" and (provided that it is possible to extract the main bios from the Asus website) I would insert that too
Leave a comment:
-
Normally PR2 should be desoldered before injecting the 19V because that resistor which has a very low value (so as not to affect the circuit) is connected to the ISL88750 chip and produces a potential difference...... How many amperes have you set the power supply that supplies 19V? You are using cables that are too small, the cable on PR2 must be soldered to pin 2 (without pr2) otherwise you cannot do any checks on the board. After you have made these connections and if the power supply does not show max amps (basically there is a short somewhere) check if there are 3V on the power button even...
Leave a comment:
-
When you are sure that no one has erase and reprogram the bios chip it's very important to read it and save the original bios. In some system it will help a lot if a dump don't work properly. If you at the first attemp don't read it with success , use another chip to make a try with a dump because it's very rare that a bios chip is faulty
Leave a comment:
-
This system also uses an AD_ID (check schematic) to validate the power supply. However, before investigating the system that manages the battery charge and the 19V from the power supply, you can try to understand if there are no other problems. 1) remove PR2 2) check if pin 2 of R2 is shorted: if it is not short, connect a wire to pin 2 of R2 and inject 19V and try to turn on. Do not connect the battery when you are testing the system this way....
Leave a comment:
-
https://[url]https://e2e.ti.com/supp...ome difference[url]https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/954931/bq24780s-bq24781-description[/url] There are some difference
Leave a comment:
-
https://[URL]https://www.youtube.com...M voltage line[URL]https://www.youtube.com/watch?v=QUWoz9vvHgM[/URL] However, it is a complex system and it takes time to study it. Meanwhile you can check the VRAM voltage line
Leave a comment:
-
First check with the tester if the mosfets are working (in reality they should be desoldered to test them but a superficial test is possible even if they are soldered), check the drop resistor is not shorted (remove it and test the side opposite the input) . If the mosfets are working and there are no shorts, check the gate resistance of the two mosfets. If everything is correct you can move on to the chip that drives them, download its datasheet and check what the basic conditions are for enabling the power supply.
Leave a comment:
-
This notebook has a Ryzen 5 3550H which has an integrated video card, the Radeon Vega 8. The PCH seems to me to be internal to the CPU so if the problems are there there is little that can be done.
Leave a comment:
-
The Bq24781 is the successor to the bq24780s and it may happen that even with all the correct voltages if it is not receiving the right signals from the host it may not work properly. Personally I would first test the system by bypassing this chip and injecting the 19v directly (be careful that on some boards it is necessary to also supply the voltage to the connector as there could be a line that powers some components before the bq24781 intervenes). If the system works correctly then I would investigate the part that concerns the chip in question. If you don't understand the problem well, it's...
Leave a comment:
No activity results to display
Show More
Leave a comment: