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Re: SUGGEST: Missing Caps in a Biostar M5VNB Socket 7 motherboard

Posted on 2023-12-03, 15:03

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I´d suggest you add 1000µF 6.3V (3x) or 10V where the smaller footprints are and 1200µF 6.3V or 10V (5x) where the larger footprints are. Don´t forget the two at the top right corner. You´ll need a BIOS chip also. Thanks for the suggestion. Thanks for noticing that two at the top right corner, I …

SUGGEST: Missing Caps in a Biostar M5VNB Socket 7 motherboard

Posted on 2023-12-03, 10:50

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello Friends, Yesterday, I found this Biostar M5VNB Socket 7 motherboard from a dealer. This one - https://theretroweb.com/motherboards/s/biostar-m5vnb But, in my un-experienced eyes, I can guess that these few Caps are missing! Because they have marks on the PCB. I have marked the missing Caps as …

Re: PC-XT Clone - HELP Repairing Battery Damaged Traces

Posted on 2023-10-06, 03:34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thermalwrong wrote on 2023-10-05, 19:44: Looks like the traces are still visible at the camera level even if they don't pass current anymore 😀 Paint.net's Adjustments > "Auto-Level" function brings up what's there quite clearly, hopefully you can use that to rebuild the connections. You are awesome …

Re: PC-XT Clone - HELP Repairing Battery Damaged Traces

Posted on 2023-10-05, 18:07

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Its Copam B-190 / Copam MC-2031 MXT1 https://theretroweb.com/motherboards/s/copam-b-190

PC-XT Clone - HELP Repairing Battery Damaged Traces

Posted on 2023-10-05, 18:05

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Friends, I am trying to repair the Battery Damaged PCB Traces in the Battery area of this PC-XT Clone motherboard. As I do not have any other reference, I will highly apricate if you can give your keen eyes and experience and draw me a trace diagram on the attached picture to guide me . https://www. …

Re: Help to repair a MFM 8-Bit ISA Card.

Posted on 2023-08-14, 04:09

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

probably no help but you can read some of the caps in this pic. Can you pls do one small test ? Pls measure resistance value between +5 line and GND with a Multi-meter. 88-89 ohms, either direction is same with in 1 ohm (- to GND, + to +5 and + to Gnd, - to +5v) If it were me: I would unsolder and …

Re: Help to repair a MFM 8-Bit ISA Card.

Posted on 2023-08-13, 18:37

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Horun wrote on 2023-08-13, 16:20: probably no help but you can read some of the caps in this pic. Can you pls do one small test ? Pls measure resistance value between +5 line and GND with a Multi-meter.

Re: Help to repair a MFM 8-Bit ISA Card.

Posted on 2023-08-13, 18:36

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Horun wrote on 2023-08-13, 16:20: probably no help but you can read some of the caps in this pic. This is HUGE help!

Re: Help to repair a MFM 8-Bit ISA Card.

Posted on 2023-08-13, 16:13

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The question is what are we assuming as short. 10 ohms will beep on most short detectors but it's only 500mA on 5V :) Wdc2010 IC supply current is 220mA Hmmmm.... I need to rethink. Because, it was a running card (decades ago), then put in a box and stored after newer PCs.... Thanks a lot for the …

Re: Help to repair a MFM 8-Bit ISA Card.

Posted on 2023-08-13, 15:48

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

And be aware what are you doing. The capacitor may show short for a while when using multimeter with very high internal impedance. Oh! To be honest, my MFM ISA Card and my MFM HDD PCB (ST-225) both showing short in +5v line. But, no such short when testing my 8-Bit ISA CGA card or those 16-Bit …

Re: Help to repair a MFM 8-Bit ISA Card.

Posted on 2023-08-13, 15:42

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Horun wrote on 2023-08-13, 15:40: It looks like a WDXT-GEN2 clone. I have a WDXT-GEN2 somewhere, will take a good picture.... Thank you soooooooooooooo much.

Help to repair a MFM 8-Bit ISA Card.

Posted on 2023-08-13, 14:54

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello, This is my MFM Hard-disk Controller 8-Bit ISA Card. May be its CXT-101. It was in running condition when used years ago. (This is not a scrap-card) Now, when testing, I only noticed that there is a short on +5v line ! Can you pls help me to identify the Capacitors and those few ICs with no …

Re: All the truth about FM in ALS100 Plus+ cards (includes facts, tech info and tests)

Posted on 2023-08-10, 18:33

in Marvin \ Sound

in Marvin \ Sound

This is my card. So, do you suggest upgrading the card by installing the Yamaha YMF262 IC and removing the fake IC? Pls suggest.

Re: Avance Logic ALS100 Plus+ REV 2.0

Posted on 2023-08-10, 17:50

in Marvin \ Sound

in Marvin \ Sound

This is mine - So many empty IC pads! Is it upgradable?

Re: What retro activity did you get up to today?

Posted on 2023-07-12, 13:01

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I ordered through JLC PCB, they're not too bad for me as long as I'm not in a rush. Can you pls check using a Multimeter to check what is the reverse current? 0 volt or 1.x volt? And Forward Voltage Drop? I will try to check tomorrow. Its on a 386 motherboard and the bios seems happy with it. I …

Re: What retro activity did you get up to today?

Posted on 2023-07-12, 07:57

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks good, real simple yet effective. I found a PCB on a youtube video and had a few made up. Found it: https://www.youtube.com/watch?v=x8K9fbHOtUM https://i.imgur.com/oqewk0zl.jpg NICE! Actually, for JLC PBC/PCBWay, Courier Charge is so high..... I ordered through JLC PCB, they're not too bad for …

Re: What retro activity did you get up to today?

Posted on 2023-07-11, 12:31

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Today, I made this Varta battery replacement at home, no custom PCB. Looks good, real simple yet effective. I found a PCB on a youtube video and had a few made up. Found it: https://www.youtube.com/watch?v=x8K9fbHOtUM https://i.imgur.com/oqewk0zl.jpg NICE! Actually, for JLC PBC/PCBWay, Courier …

Re: What retro activity did you get up to today?

Posted on 2023-07-08, 06:46

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Today, I made this Varta battery replacement at home, no custom PCB.

Help on installing the Rotary Encoder on GoTek?

Posted on 2023-05-22, 03:25

in PC Emulation

in PC Emulation

Hello, I want to install Rotary Encoder (KC30 Rotary Header) with my GoTek SFRKC30.AT2 Model. I have two Rotary Encoders. One has an extra resister - Which one to use/install? Pls suggest.

Re: What retro activity did you get up to today?

Posted on 2023-03-29, 06:42

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

With the kind help and great work from this YouTube video and its author, I managed to build this awesome 41256 DRAM TESTER for so cheap and fully effective. I tested all my 54 ICs (KM41256AP-12), 10 found to be dead/bad. Now, I can test ICs ordered from Aliexpress/eBay also.

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