Gigabyte B450 Aorus Pro stuck at VGA LED, burning hot LED Controller MCU 1 under PCI slot...

[stormanimal83]

Hey....

Board as written in description was stuck at VGA LED. common Problem wit these type of bords.... tried all the "standard stuff" like resettin... reseatin.... found out the LED Controller MCU1 = IT8295FN-56A geting burning hot under the last PCI Slot.. now i desoldered it cause there were only 18 ohms at the caps arround.... another aorus x470 in working condition with similar part and nearly same layout had arround 280 ohms...

my question is: why doesnt the board start know without this chip.... worked myself through the boardview but i can´t understand why... first time i started psu LED´s were flickerin once but when i hit the power button they turned off and the board is dead.... absolutely nothing

i´m very proud of gettin´rid of the pci slot witout damaging or burning it or anything else.....my work looks very clean....except the stuck pins. but they are still ok... otherwise i don´t care about the slot

any thoughts or experiences u could share?
is it even possible that this fault is responsible for the board to stuck at VGA? this is the only problem i found out... or could it be a corrupt Bios?

thx

some pics and explanations

Board before desoldering chip started and stuck in VGA DEBUG LED
low melt solder...



standby

the magic of low melt solder...





some stuck pins nothing broken

chip gettin burning hot while ins standby



desoldered Chip

cleaned PCB

[stormanimal83]

I´m trying to resolder the chip today tot test if it has something to do with the non startin condition state it is in now...

[stormanimal83]

I´m trying to resolder the chip today tot test if it has something to do with the non startin condition state it is in now...

😆 i resoldered the chip. it´s not gettin hot anymore and the board is starting as before.... i wonder why???? LED are okay as before but the chip stays cold.... i just desoldered bios chip because my clamp is broken... havin some trouble now by writing the chip. cant erase ist.... still workin on it...

[stormanimal83]

Yesterday i got myself a cheap APU Ryzen 3 2200G but also with this there is no chance to get rid of the VGA Led...

Is there some kind of special power rail i should look for? i don´t know how to diagnose that properly...

[stormanimal83]

Another Update... came to the idea to use a speaker.... 6b eeps followed by 4 beeps. on my experience a missing or faulty vga should bring 5 beeps. is this correct?

-4 short beep ：Real Time Clock malfunction
-6 short beep：Keyboard error

how can i fix that ? 🙄

[McWhitePink]

Better to get a diagnostic card. Cost about $30 on AliExpress

[McWhitePink]

Did you check the reset and clock signal on PCI?
the first pci slot is from cpu, others are from chipset. Did you try both?

[stormanimal83]

Did you check the reset and clock signal on PCI?
the first pci slot is from cpu, others are from chipset. Did you try both?

thanks for your reply...

long ago since i was here. yes i tried/checked all pci express slots but i didn´t look for clock and reset signals yet.just ordered a mainboard post debug device as "mainboard medic " on youtube uses... board sill beeps 6 tiomes then 4 times fast... it´s not making any difference if i use a known good ryzen 3 2200G APU or a known good graphics card and a Ryzen 5 2600 CPU.... no pass VGA Debug either...
see this video......
https://youtube.com/shorts/4Nb0A5LIG...mDlQTxEy09l2J4

[stormanimal83]

I got myself a raspberry pi pico w for postcode readings. Better that buying some more expensive ready to use debug card for more money... Ist working perfekt at TPM Header... Board is stuck at postcode "90" in the meaning of (Boot Device Selection (BDS) phase is started) but still showing VGA debug LED

Found a breakout board with LEDs already installed so could safe some time for soldering led´s and resistors. it´s usable right out of the box after programming an put the pico and the breadboard together. its better to read the Codes via serial connection with putty rather than looking at the LED´s... I did that.... nice Job from some guy on github...

https://github.com/MrGreensWorkshop/RasPiPicoSDK-PicoBiosPostCodeReader

needed: RaspberryPi Pico and freenove breakout board for about 25 euro´s





Video of Putty reading out via serial console...

https://youtube.com/shorts/DXi8TP8cu...x_eMRk4zhzpYhe

i hope this will bring a solution in future....

[stormanimal83]

i forgot the logfile from putty with codes:

...
...
...
...
data: a0
data: 52
data: 50
data: 53
data: 50
data: 20
data: 42
data: 6f
data: 6f
data: 74
data: 20
data: 4c
data: 6f
data: 61
data: 65
data: 20
data: 65
data: 72
data: 69
data: 6e
data: 20
data: 30
data: 30
data: 30
data: 30
data: 44
data: a2
data: f4
data: a3
data: a4
data: d3
data: a5
data: a6
data: ac
data: ab
data: 52
data: 53
data: 4d
data: 55
data: 20
data: 46
data: 57
data: 20
data: 56
data: 65
data: 72
data: 69
data: 6e
data: 20
data: 30
data: 30
data: 30
data: 30
data: 30
data: 44
data: ad
data: ae
data: d9
data: e0
data: b0
data: fc
data: 98
data: 99
data: 01
data: 0a
data: 46
data: 03
data: 02
data: 3e
data: 3f
data: 3e
data: 3f
data: 3e
data: 3f
data: 3e
data: 3f
data: fa
data: b2
data: b7
data: 00
data: 05
data: 05
data: d4
data: d5
data: 90
data: 91
data: 06
data: 04
data: b9
data: d1
data: 14
data: 15
data: 14
data: 15
...
...
data: 14
data: 15
data: 14
data: 15
data: fb
data: be
data: 07
data: 0c
data: 98
data: 99
data: 0d
data: 08
data: 0b
data: c0
data: d2
data: 98
data: 99
data: 12
data: 13
data: 4f
data: 50
data: c1
data: b6
data: 14
data: 15
data: c4
data: d3
data: 53
data: 54
data: 57
data: 58
data: fd
data: b1
data: b7
data: a8
data: b3
...
data: bc
data: 00
data: bd
data: 04
data: 11
data: 15
data: 10
data: 01
data: 4f
data: 41
data: 43
data: 40
data: 47
data: 42
data: 44
data: 48
data: 05
data: 06
data: 11
data: 30
data: 31
data: 00
data: 01
data: 50
data: 30
data: 31
data: 3e
data: 3f
data: 20
data: 21
data: e0
data: 04
data: 50
data: 51
data: 05
data: 54
data: 55
data: 18
data: 19
data: 54
data: 55
data: 07
data: 94
data: 40
data: 42
data: 22
data: 50
data: 51
data: e1
data: e0
data: 52
data: 53
data: 54
data: 32
data: 33
data: 32
data: 33
...
data: 55
data: 3e
data: 2b
data: 3f
...
data: 08
data: 09
data: 20
data: 21
data: 40
data: 41
data: 33
data: 3b
data: 27
data: a7
data: 40
data: 43
data: 42
data: 05
data: 85
data: 40
data: 42
data: 43
...
data: 7a
data: 7b
data: f0
data: f1
data: f2
data: f3
data: f0
data: f1
data: f2
data: f3
data: f0
data: f1
data: f2
data: f3
data: f0
data: f1
data: f2
data: f3
data: f0
data: f1
data: f2
data: f3
data: f0
data: f1
data: f2
data: f3
data: f0
data: f1
data: f2
data: f3
...
...
data: f0
data: f1
data: f2
data: f3
data: 4f
data: 5d
data: dd
data: 40
data: 42
data: 60
data: 61
data: db
...
...
...
...
data: 62
data: 55
data: e5
data: 0a
data: 0b
data: 02
data: 03
data: 06
data: 07
data: 22
data: 23
data: 38
data: 39
data: 4c
data: 4d
data: 0e
data: 0f
data: 1a
data: 1b
data: 22
data: 23
data: 55
data: 90
data: 91
data: 94
data: 95
data: 96
data: 10
data: e5
data: 23
data: 25
data: 27
data: 24
data: 44
data: 45
...
data: 56
data: e6
data: 25
data: 26
data: 58
data: e8
data: 63
data: d3
...
...
...
data: 90

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