stj, I did ask him about air flow and he said the air flow is OK. Only thing is the temperature cannot go beyond a certain degree. This is what he mean by weak. Thanks....

stj, I have missed out one important info i.e. seller told me that the heating element is weak so need to replace it. At the hot air gun is unusable....

Hi Everyone,
I bought a Yihua 992DA+ hot air gun and soldering iron unit from a used market.
1. Soldering iron works great
2. There is a burnt mark on the hot air gun handle.
I am a bit concern by the look of the melted plastic. I opened the hot air gun handle and took some readings with a multimeter.
Heating element ~ 75ohm. (Similar reading taken from a spare heating element that came with the unit.)
Thermocouple ~ 1.5ohm. (Similar reading from the spare heating element.)
Reed switch tested ok with a magnet.
From the above test, I can conclude...

@m1ch43lzm, Thank you for your reply. I couldn't ask for more. I can proceed with the debug now.

Aliencomputres, I downgrade to 4604 and still no good. So, it's not BIOS issue. Thanks.

@m1ch43lzm, I have looked at UD700 and having a hard time tracing. The is no UD64 in the motherboard. Is this normal?
Before coming to Badcaps, I have removed UD6, UD7, UD21 and UD24. I stop at UD24 because the PC booted up OK. But the problem came back the next day.
These are SOT23 6pin IC aka ESD protection diodes / TVS diodes. All these chip have Asus internal marking. Any idea which part I can buy to replace them?
Thanks.

@m1ch43lzm, I will look into it and get back to you. Thank you very much.

@m1ch43lzm, Thank you very much for your tips. I will look into it. But first, please help comment on my findings. I just learn how to use boardviewer. 😁 I measured +5V for UD5 and OD400 and both showing ~4.5V. Can the low voltage triggered the USB device over current detection?...

@m1ch43lzm, I managed to program the BIOS chip with Rev 4622. But the USB device over current still there. I have to remove the bad ESD protection chip which is still on the motherboard....

@m1ch43lzm, Thanks. I have a CH341A and it voltage selector switch. I selected 1.8V. When I click detect on NeoProgrammer, the LED turn green momentarily and turn red....

Hi,

Is it impossible to flash Asus TUF B450M-Plus Gaming BIOS(25LB128D) with CH341? I have done it with H270N BIOS.
I used NeoProgrammer and selected 25LQ128C IC since 25LB128D is not in the chiplist.dat. I get no response from IC.
Any expert can help on setting up the import.xml so that I can import 25LB128D into chiplist.dat.

Thanks in advance.

I was googling for a solution to my Asus motherboard USB device over current detected status and I found this forum. Thank you very much.