Hi all!
I have a rather interesting problem with the Asrock B450 pro4. The motherboard firstly does not turn ON at all, basically the power switch does nothing. I probed the voltages and i saw that the 5VSTB is present. When switching the power button the respected line pulls down the NCT6779D PSIN# pin(pin 61) but the PSON# pin(pin 63) stays on 5V and doesn't get pulled down. I looked at some diagrams and saw that the PSOUT# pin(pin 60) is also needed in a high position but it only have 0.63V on it. However the PSOUT# does get pulled to 5V when i switch the PSU on but then goes down to...

Interesting! Thanks so much for the clarification and sorry for a late reply. Maybe one day i will try to do a bios reflash myself And yes i do remember was just curious....

Sparo but why do people then ask for a S/N number? Isn't that data stored in the first 2048 bytes? Does the bios chip the write those first 2048 bytes on boot? Am curious to find out what actually happens ...

Holy moly it worked!!! I flashed the 5606 version on the bios chip and resoldered it and it worked in the first try! Thank you so much Sparo for your help and flashing. If you don't mind can you tell me what you did with the bios dump to get it working? Below is proof it worked. Again tysm. ...

This is the bios that was on the chip, but with it it never booted up. I bought the mobo from someone who claimed he already tried the bios reflash which didn't work for him. So basically he already did a reflash but from the information you gave me he didn't do it correctly. I will try to boot it with your sent files(thank you so much for the files!!! ) and report back what happens...

My bad! This is the serial number from the box: H3MCAJ003689. There were no other stickers on the mobo. Is there any other way to check?...

Hi guys!
I have an Asus prime x370 pro mobo which suddenly stopped working. The screen went black and there are no error beeps or anything coming from it. Since all the voltage lines are there and everything else seems fine i desoldered the bios chip and copied its dump. I have 0 experience in this area and have no idea how to get the right bios version. So please can someone help me with a new bios. Here is my dump. Also i saw there were alot of bios versions for this board but i have no clue which one i would need so i guess any newer stable ones would be good.
Thanks in advance...

Hi there, thanks for your help CapLeaker . I have successfully found the issue it was the burnt Schottky diode D16 which shorted the -12V to GND. The pulses were clearly visible on the oscilloscope on the Anode side but it never reached the resistor R62.

Edit: There was no L7912 responsible for the -12V it was rather on the same coil than the 12V line. I didn't bother bypassing the IC but good to know for the future....

Hi everyone!
I have an EVGA supernova 750 G+ that suddenly stopped working. The PSU powers ON , but then immediately powers OFF(can be seen by the fan slowing down and i probed all the power lines with an oscilloscope). All the power lines have their respected values even 5V standby and after initial ON stay on their voltages for a few milliseconds, except for -12V and PG(expected since its missing one line). I used a red circle to indicate where the -12V goes to the output connector but was unable to trace it over the board. Since i didn't find any boardview files or schematics i am kind...

Thanks for the input! I think you are correct, but for the heatsink i could manage to modify it a little so it fits over the coils. I was more curious about the GPU and CPU placement since those screws are critical to fit. What are your thoughts on that?...

Hi everyone!
I have a rather general question but still need some motherboard expertise. So i have a laptop of which motherboard(MS-16R81 ver:2.0) died. I looked for a replacement motherboard but they are rather expensive so i was wondering if i could just "downgrade" the motherboard to a version that has a weaker CPU and GPU. My question is if the downgraded motherboard(e.g. MS-16R51 or MS-16R11) will work and if its compatible with the rest of the peripherals. Any suggestions or tips what to watch out for are welcomed and the photos are taken from the internet as examples....

Hi!
For anyone following this thread i am pleased to report that the monitor is working! The issue was the panel as lotas suggested. I took his advice of measuring the resistances relative to GND which were fine. Since these were the lines going to the monitor i wondered if i could see the current consumption on each line and figure out where the fault is. When probing thru all the resistors(current measuring), resistors 3 and 5(counting from top to bottom) were having skewed PWM signals and the consumption was rather high(picture of osciloscope). I desodered the mentioned resistors and...

I measured the REF pins on the main daughter board and saw that the REF_TEND, REF_VST and REF_VCK were all pwm signals with some period, what was curious to me was the REF_VDDA pin which cycled between 3.3V and 0V (all values were measured on the main daughter board while the slave daughter board was disconnected). Does anyone have any idea if this is expected/normal or is it another sign of a faulty panel? Would need help since i am inexperienced in this field.

Hi lotas!
Firstly thanks for your answer! I have measured the resistances and they seem fine relative to GND and between each other. They all land around some tens of megaohms. I also tried on the other slave daughter board and they seemed fine too. Any other ideas?

Hello everyone!
As mentioned in the topic i am debugging a VG32VQ monitor which has a quite curios issue. For starters the backlight is working, the mainboard is also working and audio is being normally played thru the speakers. The problem of the monitor is that the screen is always blank(you can see the backlight turns on since the screen brightens a little bit but still black). When plugged into a computer the monitor is detected and HDMI signal is being broadcast to the monitor(checked with a data analyzer). The monitor panel should not be damaged but i am open to this option.
...

Hey everyone!
So i know this thread is a little old but i still wanted to know if anyone got a clear anwser or at least some sort of knowledge what was the fault
I am asking because i am encountering a similar issue.
Regards