Re: Abit ST6E "Casper" fix
Ok. How can I find the replacement for this transistor? On what parameterers I have to look?
I already know that it's NPN transistor in SOT223 case.
bartx
Member
Last Activity: 11-13-2022, 04:53 AM
Joined: 11-21-2019
Location: Pszczyna
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Re: Abit ST6E "Casper" fix
Replaced this transistor and it's working
Thanks dicky96 for help.
This tester which I have show the same values for both component, looks like this transistor was leaking after putting some load on it....Leave a comment:
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Re: Abit ST6E "Casper" fix
Yes, exactly it's 16 pin chip next to the transistors. And from pin 14 voltage is supplied to the base (5V).
Q3 is descibed in this datasheet as Fairchild TIP41A (it has different case, but it should have the same paremeters I guess).
Sorry, electronics is not my profession, so I don't know on which details I have to pay the attention
I have some experience in reading the datasheets though, I used them quite a lot vmodding the boards and GPU....
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Re: Abit ST6E "Casper" fix
I've found a datasheet on FAN5063 controller, which contains application circuit.
Looks like Q3 is directly responsible for delivering voltage for SDRAM. There is no voltage control, output voltage is simply controlled by formula using R1 and R2 values (it's 2,5V for RDRAM and 3,3V for SDRAM). Q3 is the transistor where I found difference in voltages.
I measured both boards, both controllers, high/low states on PWR_OK, SLP_S5 and SLP_S3 and I haven't found anything different except voltage on Q3.
...Last edited by bartx; 03-12-2020, 10:18 AM.Leave a comment:
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Re: ASUS TUF Z270 Mk 2 beeps with no ram but will not boot
I'm not 100% sure, but this 9-pin connector may be the interface for bios flash. Is there a bios IC near this connector?
Does this board have a bios flashback? It allows to flash the bios without even powering the board.Leave a comment:
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Re: Abit ST6E "Casper" fix
That's Fairchild component, marked D114 G51, on other board it's marked D139 G51 - unfortunately I was not able to identify it by SMD code.
I also noticed difference between capacity measured on the legs on the capacitor just below this componenent mentioned above. Good board have 2700uf, bad board 1800uf. Could one of the RAM capacitor cause such issue?Leave a comment:
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Re: Abit ST6E "Casper" fix
Placing the RAM in the board leads to exact the same situation as the board will be without the CPU - instant 00 code. No other codes before that.
It doesn't even come to this moment, when board checks if the GPU is present or not. Anyway, it has the IGP so GPU is always present.
I've checked on working Abit ST6:
- without the CPU - on both boards 00
- with CPU, no RAM - on both boards C1 and long beep
- with CPU and RAM - Abit ST6 moves further with testing, display other codes...Last edited by bartx; 03-09-2020, 04:57 AM.Leave a comment:
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Re: Abit ST6E "Casper" fix
I have two type of CPU, confirmed working - Celeron 800MHz Coppermine and Celeron 1000MHz Tualatin.
I've checked once again the codes:
- no CPU, no RAM - 00 code, no beep
- CPU present, no RAM - ends on C1 code, before that C0 and AF are present, all 4 LED on PCI card are on (RST, FRAME, IRDY, CLK), long beep
- CPU present, RAM present - hangs on 00 code, IRDY is off in this case, no beep
No post, no display, new cmos battery - that's basic. I tried also with bios IC from ST6 - no luck.
...Last edited by bartx; 03-09-2020, 02:34 AM.Leave a comment:
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Abit ST6E "Casper" fix
Hi,
I have an Abit ST6E board aka "Casper", which is unfortunately not working. Because it's very rare board, I'd like to repair it, not matter the cost or how hard it will be. It's in 95% identical with ST6, only difference which I saw is that ST6E has different NB and SB (ST6E uses 815, while ST6 uses 815EP without IGP). I've already bought working ST6 for diagnostics, and maybe a part donor if needed.
Here is what I've found out already about this board:
- hangs on 00 code using PCI Diagnostic card, no matter what CPU
- reports the lack... -
Re: DFI Lanparty NF4 939 Problem
I'd like to add some words from me. I have 4 of those boards with such issue. One hangs on DFI logo, but on other three two lower RAM slots are not working. Of course it had been tested with dozen cpus and RAM, I also switched a bios chips between them.
I've found an opinion, that it might be causes by broken balls below the socket. One board lost two RAM slots right after I used a cooler with the spring mount. I decided to unsolder one socket and bought two pieces of 939 sockets on eBay, but looks like they don't have them or they...Leave a comment:
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Re: CH341a SPI / I²C programmer
I'm not sure if it was mentioned before, but I recommend Flashrom as a software for CH341a programmer. Driver is included and it worked couple times for me unlike the original software delivered with this programmer.Leave a comment:
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Re: New Members - please post your introductions here
Hi,
I'm Bartek, extreme overclocker and hardware collector. Looking for some help with fixing old rare hardware, I can share some of my knowledge too.Leave a comment:
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