First post, by nimruil
- Rank
- Newbie
Hello everyone, I recently acquired a P166 PC. It has an LCD display and Turbo button + LED. When I acquired the PC this display showed "18". So I did some research on the subject to make it work properly but I couldn't.
To clarify, correctness of numbers is currently not a priority for me. I am trying to make the system work correctly, as in, when I press the turbo button, cpu changes freq., turbo light changes status, and the display changes values. When i press again, everything comes back to previous state. Sorry if I explain too long I am doing my best 😀
Of course, correct me if/where I am wrong. Here is what I know/don't know:
The display circuit:
- Model is ST-7A. It has 6 pins on the back. +5V-G-IN-?-L-TL-H.
- +5V and G have a molex connector and obviously they are power and ground. No questions here.
- Simple logic says IN should be some type of input. From what I gathered so far this is supposed to be some low voltage electricity from the mobo to indicate that TURBO is triggered or not (more on this later).
- ? has no text at all so I have no idea what it is.
- L-TL-H seem to be Low, Turbo Led and High. So if the two cables from the led light are connected to L and TL, it is triggered when working cpu freq. is in low setting. Consequently if you connect the cable to TL and H, led should work when the cpu freq. is in high setting.
The mobo:
- It's AT.
- Model is 5ITXA-Revc. It has 4 pins in total for turbo stuff. They are near each other. Left to right: First two is TURBO LED CONNECT (VCC-LED1 SIGNAL), last two is TURBO SWITCH CONNECT (unknown, manual says default close and that's it. They were connected by a jumper when I got the PC.). After TURBO SWITCH CONNECT there are IR pins, first of them being VCC. I am going to put a photo to visualize all this.
The turbo button:
- It has 3 cables. Orange, black and white.
My findings:
- I checked to see if the pins on mobo have any currents or not. TURBO LED CONNECT VCC has 5V. LED1 SIGNAL has zero. SWITCH CONNECT 1 has zero, SWITCH CONNECT 2 has 0.01V-0.02V.
- When i connected the IN from display board to SWITCH CONNECT 2, display changed from "18" to "33". At this point, TURBO LED also started to shine.
- Connecting IN to SWITCH CONNECT 2 obviously makes it impossible to connect turbo button cables to TURBO SWITCH CONNECT.
With all this info I thought the working scheme would be TURBO SW triggered-> MOBO makes the change -> DISPLAY receives signal from MOBO that something changed so change display values-> TURBO LED is triggered on/off. I checked the displays at minuszerodegrees, but I couldn't find something similar. ST-6A looks very different from what I got.
So, how am I supposed make all of this work? Any help would be greatly appreciated.
