VOGONS


First post, by Unrealcpu

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Tried using my PCI video card , with a p233mhz mmx, k6-2 500 and a 533mhz k62
no pc speaker beeps, tried pc100 and pc133 ram

MSI-5169

see photos of m obo

>https://linksharing.samsungcloud.com/qrN3tjQMkOTE

Fan headers work, 2032CR replaced, CPU gets hot but not video signal or post beeps.

Tried multiple dip switch c onfigurations and nothing.

maybe someone can lead me into the right direction by testing the voltage regulators? Caps look good or telling me how to set the dip switches?

Manual is on the MSI website

https://www.msi.com/Motherboard/support/MS5169#down-bios

I really do not want to throw this in the trash
🙁

Reply 1 of 12, by gex85

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Don't know If you already found my thread from July: MSI MS-5169 dead - blown MOSFET?

I ended up replacing the MOSFET and brought the board back to life. The thread contains instructions on how to measure the voltage. In case you need to make a similar repair, make sure to use a new CPU also. Mine was dead, it had a short that could have killed the newly replaced MOSFET right away.

1992 - i486DX2-66 // 1997 - P1-233 MMX // 1998 - P2-350 // 2000 - P3-650 // 2001 - Athlon 1400 // 2003 - Athlon XP 3200+ // 2008 - Xeon E5450 // 2015 - Xeon E3-1240v5

Reply 2 of 12, by fool

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You should also check that the MOSFET is not shorted. Measure resistance across the MOSFET(s), from pin3 to pin2(tab). Also Vcore can be measured without processor installed.

I just managed to destroy two socket 370 celeorons due to shorted transistor before I relized what's happening. It was 5V directly on CPU core. I really hope this is not the case with your MB.

Reply 4 of 12, by Unrealcpu

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fool wrote on 2020-11-22, 16:49:

You should also check that the MOSFET is not shorted. Measure resistance across the MOSFET(s), from pin3 to pin2(tab). Also Vcore can be measured without processor installed.

I just managed to destroy two socket 370 celeorons due to shorted transistor before I relized what's happening. It was 5V directly on CPU core. I really hope this is not the case with your MB.

ok so looking at the data sheet

i see on the mofet a drain and source.

I put my multi meter in diode mode

negative on the drain which is the middle pin and then to the right the souce which i put my positive probe
,
one measured 0.556v almost 0.6v
the other measured 0.192v which is concerning. Both mofets had high resistance nothing opened or shorted

is this the correct way to read it? under 0.3v is a bad mofet.

however i went on this site http://electronicsbeliever.com/how-to-know-if … t-is-defective/ and my mofets passed all the tests.

The only thing i noticed was 0.192v reading on one mofet messured at the drain and source

quite confused here ,seems like there is a crap load of tests for mofets

Reply 5 of 12, by Unrealcpu

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fool wrote on 2020-11-22, 16:49:

You should also check that the MOSFET is not shorted. Measure resistance across the MOSFET(s), from pin3 to pin2(tab). Also Vcore can be measured without processor installed.

I just managed to destroy two socket 370 celeorons due to shorted transistor before I relized what's happening. It was 5V directly on CPU core. I really hope this is not the case with your MB.

my processors are still alive after testing on a different mobo.

Reply 8 of 12, by fool

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I had the very same issue with Gainward 5VPA with VIA MPV3. It did nothing. After changing FSB/multiplier/memory jumpers back and forth suddenly it just woke up. Those things can be tricky and there are about a million things to check. Maybe I would just remove all jumpers and re-install them according the manual starting from the clear CMOS jumper 😀 Be sure you have JV1 on dual voltage, MMX and K6-2 use dual supply. Does it beep without memory/video card? Have you tried different power supply?

It sounds like transistors are good. I would also measure AC and DC voltage levels from the load-side if there is a test point or capacitor can also be used. Ripple voltage should be very close to zero (couple of millivolts) and DC of course the level you have set. Multimeter is not ideal for measuring high freq ripple, but it will give you some hint if capacitors are failing. Remember ripple is supposed to be high between transistor and coil, so measure closer to capacitors.

I have MS-5169 v2.1 somewhere and it does not work with K6-2 greater than 500MHz. Nevertheless 233MMX should be fine of course. With K6-2 FSB can be set to 66MHz and multiplier to x2.0 -> processor translates it to x6.0 giving 6x66=400MHz for troubleshooting purposes.

Reply 9 of 12, by Unrealcpu

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fool wrote on 2020-11-25, 18:45:

I had the very same issue with Gainward 5VPA with VIA MPV3. It did nothing. After changing FSB/multiplier/memory jumpers back and forth suddenly it just woke up. Those things can be tricky and there are about a million things to check. Maybe I would just remove all jumpers and re-install them according the manual starting from the clear CMOS jumper 😀 Be sure you have JV1 on dual voltage, MMX and K6-2 use dual supply. Does it beep without memory/video card? Have you tried different power supply?

It sounds like transistors are good. I would also measure AC and DC voltage levels from the load-side if there is a test point or capacitor can also be used. Ripple voltage should be very close to zero (couple of millivolts) and DC of course the level you have set. Multimeter is not ideal for measuring high freq ripple, but it will give you some hint if capacitors are failing. Remember ripple is supposed to be high between transistor and coil, so measure closer to capacitors.

I have MS-5169 v2.1 somewhere and it does not work with K6-2 greater than 500MHz. Nevertheless 233MMX should be fine of course. With K6-2 FSB can be set to 66MHz and multiplier to x2.0 -> processor translates it to x6.0 giving 6x66=400MHz for troubleshooting purposes.

I looked at the manual for this mobo and see no JV1 header

Reply 11 of 12, by fool

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You are right, checked the manual of 4.0. It turns out MSI has upgraded it in a way it no longer supports single voltage processors -> no-MMX Pentiums, Cyrix 6x86 or AMD K5.
OT: Actually what did they change to gain K6-III support...?

Reply 12 of 12, by Unrealcpu

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fool wrote on 2020-11-27, 15:44:

You are right, checked the manual of 4.0. It turns out MSI has upgraded it in a way it no longer supports single voltage processors -> no-MMX Pentiums, Cyrix 6x86 or AMD K5.
OT: Actually what did they change to gain K6-III support...?

what cpu works then?