karlp028
Member
Last Activity: 04-17-2025, 01:05 PM
Joined: 07-20-2024
Location: Halifax NS
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I got a new microscope a couple of weeks ago and was looking at this board again tonight. I noticed some damage to the capacitor (CP132) that was next to the resistor in question. I removed it and now the short is gone.... -
Thanks. I actually found it last night. There was a capacitor next to the chip that looked a little burned on one end. I removed it and now the short is gone. The cap and the chip must share a ground plane which explains why it was getting hot.
The board works now, except I have to add the LAN chip back. I wish I hadn't removed that.Leave a comment:
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MSI B360M Bazooka short on 3VSB rail
I have an MSI B360M Bazooka with a dead short on the 3VSB rail (and VDD33 which is connected). The ethernet controller chip (UL3 in boardview) was getting very hot, so I thought that was the culprit. But after I removed it, the short remained. When I added 5V standby power again, I noticed the ground pad where the ethernet controller had been was getting very hot, as was the nearby hole for an m2 standoff.z
I haven't found the problem component(s) causing the short yet (no thermal cam). Does the heating of the ground pad mean it should be something near there? -
I think it's more likely that the chip is shorted and is drawing high current. That would explain the voltage drop and the heating of the chip.Leave a comment:
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ASRock B450 Steel Legend - no reaction to power button
I've got an ASRock B450 Steel Legend that I'm trying to diagnose for no reaction to the power button.
The SIO receives the PWRBTN# signal and sends PSOUT#, but the CPU doesn't return SLP_S3# so nothing further happens. I have been looking around the board trying to figure out why and I happened to touch the STEP-DOWN CONVERTER NB685GQ-Z (UP10 in photo) which was VERY hot (like burn your finger). This seems to provide VDDP_S5, and indirectly, VDDCR_SOC_S5, which the CPU needs in order to handle the startup signals.
The VCC voltage powering the converter does not look right.... -
Thanks for the tips. Is there an industrial grade flux and a solder paste that you could recommend? I'm not too concerned about ruining the board since it doesn't work anyway. I will definitely practice first on some old boards.Leave a comment:
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MSI PRO Z690-A WIFI DDR4 doesn't start
I bought a used MSI PRO Z690-A WIFI DDR4 and it does not start up at all so I started looking into what was going on. PWRBTIN makes it to the SIO, but then I noticed that PWRBTN# (e.g. PSOUT#) was shorted even before I tried to start it. At first I thought the short was in the SIO, but after some more tracing that was the only SIO pin that was shorted and I found more shorts on 3VDSW, SYS_3VSB, PCH_0P82_VSB and a couple of other PCH pins. The chipset gets pretty hot even in standby, so I'm 99% sure the short is in the chipset. I've seen a few other posts around the same problem with this board.... -
Thanks for those! I'm still looking for the [I][B]B450M-A II[/B][/I] Boardview. It uses a totally different PWM controller (uP9505) with a different pinout than the original B450M-A and I believe that is where the problem lies with the board that I have.Thanks for those! I'm still looking for the [I][B]B450M-A II[/B][/I] Boardview. It uses a totally different PWM controller (uP9505) with a different pinout than the original B450M-A and I believe that is where the problem lies with the board that I have.Thanks for those! I'm still looking for the [I][B]B450M-A II[/B][/I] Boardview. It uses a totallyLeave a comment:
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ASUS Prime B450M-A II Boardview and/or Repair Guide
I'm looking for the Boardview and/or Repair Guide for an ASUS Prime B450M-A II that I'm trying to revive.
Thanks... -
MSI PRO Z690-A WIFI DDR4 no reaction to the power button
I've got an MSI PRO Z690-A WIFI DDR4 that has no reaction to the power button. I have been doing some exploration to try to determine what is wrong with it.
The front panel PSIN# pin has 3.3V on it, so i started tracing from there to the SIO, which is a Nuvoton NCT6687D. Connectivity from the front panel PSIN# to pin 61 on the SIO is good and when I short PSIN# to GND then pin 61 goes low as it should.
However, I noticed that SIO pin 61 PSOUT# was already low, even before I activated PSIN#. Does this mean the SIO chip is hosed or could there be another explanation? I'm... -
Hi, I'm Karl and I'm learning about motherboard repair.Leave a comment:
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