| Electronics > Repair |
| Mainboard with No Picture |
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| 2X:
Hi, I made some more measurements with oscilloscope. I read on the datasheet that "It is important that the driver ICs reach their POR level before the ISL6565A, ISL6565B becomes enabled.", so I measure the VCC of ISL6565B in respect to ISL6613 in the working and faulty matherbord and the only defference that I saw was a spike in the faulty one. Also, the PGOOD (in the faulty one is zero and in working one is ~5V) can be affect by pins EN, ENLL, POR, or one of the no-CPU VID codes "PGOOD only transitions low when an undervoltage condition is detected or the controller is disabled by a reset from EN, ENLL, POR, or one of the no-CPU VID codes.". I measured also this with oscilloscope but I didn't saw something. I measure also the I sense pin but I didn't pulse that will declare a short. What do you beleive can stop the phase controller from giving PWM pulses? Also a weird thing for me is that I use a thermal camera and the CPU has temp around 50Celcius (after 2 mins approximattely)... how the CPU can have a temperature like this without the ISL6565B not working? |
| 2X:
The rest images. |
| 2X:
Does anyone knows if there is a aschematic for this motherboard or at least a schematic diagram for a similar model? |
| 2X:
I thought to make an experiment... to remove the CPU and give with an external power supply the 12 V and the VID voltages (VID4 - VID0, VID12.5 --> 010101 --> Vcore = 1.600V) on the ISL6565B and attach a resistor of 4.7ohm at one of the coils so to check if the ISL6565B will work. Do you beleive it is worth or will make any further damage on the motherboard? |
| Haenk:
Did you check the solid caps? I noticed you did not replace those. These do have a limited lifespan as well; if in commercial 24/7 use over a decade, you might have reached the end of the lifespan. Is your software bound to the BIOS? I'm really convinced a whole replacement computer might be the way to go, FSC sold a zillion of computers in Germany, might want to check ebay or kleinanzeigen.de |
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