Be careful, the "clock" trace from pin2 ending with an "empty" noose does not mean it´s ending there, buth the trace is continuing in some in-between-layer underground. Sure. It goes to unsoldered inductor L5 located right under SIMM slots along with inductors for keyboard data and clock. And it …

Wait! Before you remove that mini-KBC please check if pins 1, 2, 18, and 23 go anywhere! I have a hunch that 1 and 2 might just be mouse clock and mouse data It doesn't seem they go anywhere at all. At least they certainly not connected to mouse data or mouse clock. They have approximately 1.5MOhm …

After applying multimeter to my LS-486e Rev:D I discovered that something is missing :) CN3 - 5-pin header C5 and C7 - 47pF L4 and L5 - 470uH RP19 - 4 x 10kOhm U29 - 74LS06 U30 - HT6542B or AMIKEY-2 (PS/2 keyboard and mouse controller) And something is superfluous: U28 - VT82C41N (keyboard-only …

Are you certain when you put the 5x86 back in, you had it positioned correctly in the socket? If you accidentally had the processor "clocked" incorrectly--meaning pin 1 of the CPU was 90/180/270 degrees off from pin 1 of the socket, most of the time it results in a fried 3v3 regulator. Have MB with …

pan069 wrote on 2021-02-09, 21:07: But the cover of this manual says Ver 2A... Yep. Possibly wrong cover or different vendors label revisions in their own way. However jumper settings are from Rev:D. That's why I posted it.

This one is for Rev.D Filename ls486ed.zip File size 674.4 KiB Downloads 127 downloads File comment Scanned Rev.D manual

Try to reverse engineer the area around the transistor, it should be a general purpose 2N3906 or 2N 3904 (PNP or NPN). Depending on how the transistor is connected to the power rails/if the base is pull up or down, you should be able to identify the type needed. Good idea! Looks like it is MMBT3904 …

Hello there! If anyone have MS-4138, please help me identify element on that motherboard. Transistor Q2 in SOT-23 case near 3rd and 4th ISA slots (see photos) I think it should be either 2AK (PNP BJT MMBT3906) or 1AMN (NPN BJT MMBT3904). Filename 1.jpg File size 502.64 KiB Views 180 views Filename …

https://img-fotki.yandex.ru/get/5820/26403844.5/0_59aae_f467e1e9_-1-L.jpg This baby-AT case I have seen in two versions, this (2 5,25", 2+1 3,5" sections) and larger [ 1 , 2 ] (3 5,25", 3+1 3,5" sections). I have in my collection two small such cases and one larger. All of them are bundled with …