IBM Thinkpad 380Z - padlock boot

Posted on Yesterday, 19:04

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Good evening :wave: This time i'm trying to repair this old laptop, it's an old b] IBM Thinkpad 380Z[/b], from 1997. https://nsm09.casimages.com/img/2021/07/18//mini_21071804204425187817497008.jpg https://i.imgur.com/MZCyNZr.jpeg That's its specs : Brand: IBM Model: Thinkpad 380Z CPU: Intel Pentium …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-19, 21:24

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I finished testing the circuit and this is the schematic. I would say it works without problems. tomorrow if the heat permits I will do the version on a base (welding with 34 degrees centigrade is torture). I was wrong to mark the two pins on the previous connection diagram and I corrected it in …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-19, 20:48

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I finished testing the circuit and this is the schematic. I would say it works without problems. tomorrow if the heat permits I will do the version on a base (welding with 34 degrees centigrade is torture). I was wrong to mark the two pins on the previous connection diagram and I corrected it in …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-19, 20:46

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I saw that you are working on an old Olivetti PC, I remember a similar PC (about twenty years ago), I extracted the HDD, the disk was working until a few years ago, unfortunately I think due to an incorrect setting of the jumper, what appears to be an SMD capacitor has blown, maybe if you wanna …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-18, 22:50

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My PCS-11 has started, the ATX power supply connection circuit (or pico PSU in may case ) is correct except for the brown wire which is the reset that comes from the original power supply, inserting the test board in fact without that wire connected the resetis off , insert a resistance in series ( …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-18, 22:39

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I saw that you are working on an old Olivetti PC, I remember a similar PC (about twenty years ago), I extracted the HDD, the disk was working until a few years ago, unfortunately I think due to an incorrect setting of the jumper, what appears to be an SMD capacitor has blown, maybe if you wanna …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-17, 15:16

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've also take the KBC out and clean it well with contact spray. I put it back and start the PC, but nothing changed sadly.

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-17, 14:02

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So i've tested to remove and clean the BIOS chip, i tested right after to see if anything change, but no.

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-16, 20:18

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay, but i'm already using a brand new PSU with the PC. :) Thanks it can be useful though! This might be a silly question, but did you try pressing the reset button? This is especially important if you do a resistor mod in place of proper PWR_GOOD signal from PSU, like I suggested earlier. My 286 …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-16, 19:50

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If it doesn't work you can replace the power supply with this one, I normally use it with 286,386 ,486 and same pentium motherboards Obviously with a suitable power supply, I will shortly do it on my pcs11 and let you know Okay, but i'm already using a brand new PSU with the PC. :) Thanks it can be …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-16, 19:49

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Oh I've successfully booted my PCS 11 with an ATX PSU before with the pinout I described above. As my ATX PSU was newer than the ATX 1.x specifications it didn't have a -5v rail, so I left that out (P22). I did this months ago mind you. I knocked up an adapter using a filed down du-pont connector …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-16, 18:58

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Has keyboard been plugged in every time you tried it? Just because a bad keyboard should be ruled out. Try without, if it then gets as far as complaining about not having a keyboard, then the keyboard must have problems. Nope most of the time i didn't plugged the keyboard in. I've try with and …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-16, 15:39

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The fact that the keyboard stays lit up suggests that the PC isn't POSTing properly, regardless of the display working or not. The keyboard should be initialized (flash all three LEDs once), and if the test is successfully passed the PC moves onto testing the Floppy and Fixed Disks (you would see …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-16, 14:02

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So here it is, i changed all major component on the mother board, and it still the same nothing happends, so maybe the video chip is dead? I'm looking for an ISA video card then. 😀 https://youtu.be/hfZwXCUhVr0

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-16, 13:13

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Anything is possible to replace with the right equipment. It might not be the video chip that's failed, it could be the video DRAM, it could be a corroded trace, anything. But in order to rule it out, try an ISA video card. You'll likely want one anyway, as the onboard video isn't the greatest. I …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-16, 12:15

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

As I said, my PCS 11 (same motherboard as the PCS 33) will happily boot without the -5v rail, and the pinout I posted is correct. Verax: I'd be tempted to try an ISA video card, just in case the issue is now with your onboard video. Yes i think that everything is correct because it starts out so i …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-16, 12:13

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

And also, how do i do to start the PSU? Do i need to bridge two wires together like the green one (Which is PS_On) with another one? You can start the ATX PSU by connecting PS_ON signal to GND (preferably the one right next to it). I've used (un)bent paper clip for that purpose, and found it's …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-16, 10:31

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

OKay guys today i've tried out with the PWR_OK solded in. THere is some change, now when i start the PSU everything starts, the HDD etc. And there is some white stripes poping and disapearring at the very beginning. Is it normal to this? From this : https://nsm09.casimages.com/img/2021/07/16// …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-15, 21:45

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So, i did test out with the wires diagram, and guess what? It worked as for launching the computer however, still nothing appears on the screen... I might try to change some caps on the mother board to see if it changes something, i'll let you know ;) Here is the video of the first launch with the …

---

Re: Olivetti PCS33 (386 SX)/M-300 - Repairing

Posted on 2021-07-15, 17:26

by

by Verax

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay so we both agree on that then good! :) Okay so the blue must be the "-12v" right? I can't measure it for some reasons, but thanks clarifying this as well. I got to say that i'm lost on the white one? On the other PSU the white wire is the "-5VDC" one but i don't think it's the same for the …

---