Logic board to HF/e1 board cable broken
I had a problem with the GPU of my 820-2179-C board, dissassembled it easily but I made a mistake and cut the 4-wires cable that connects the HF/e1 small board to the main one (there is a socket in the main board and the 4 wires are soldered directly in the HF/e1).
Now I do not know how to solder the wires. The four of them are exactly the same color (black) and there is no labels anywhere.
Does anyone know the order of the cables? Any way to get the schematic of the board?
I have found a very good picture of the cable but it is impossible to get this info from a picture.
http://bimg2.mlstatic.com/logic-board-16...
I would connect the upper wire in socket with the left wire in the HF/e1 board, the second with the second and so on but sometimes logic does not work.
On the other hand, I guess it is impossible to find a replacement for this small cable and I will have to fix it soldering wire by wire.
By the way, what is that HF/e1 board? After cutting this cable I get three beeps when swithing on the laptop. This should mean RAM problems (?).
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what are the last three digits of your computer? This would help to identify your computer properly.
из oldturkey03
Since it is a sensor that receive data through those cables, I would strip the ends of all four wires and connect them temporarily with alligator clips. By the nature of the feedback O do not think that polarity will be an issue, therefore you should not short circuit the board.
из oldturkey03
Thank you very much for your answers, oldturkey03. I am happy to confirm that the three beeps can come from here.
The laptop model is MB003LL/A. I don't know if these are the numbers you were requesting. I have all the info about it from http://www.appleserialnumberinfo.com, if you need any extra info about the laptop model I can tell you.
About the HF/e1 board, do you think that the four cables are for sensing? This board seems to be glued to the main board, no electrical connection between them, so that I guess that one cable might be voltage supply, another one might be ground and the two others could be for sensing. This is something I am guessing because I cannot find any information about this board.
The only place I have to get info about the cable is the picture I posted. Checking it carefully, now I think that the upper cable in the socket can be the cable at the right in HF/e1 board. Difficult to ensure anything, though.
из Sergio
Okay looks like it's a Introduction Date: January 15, 2008* Discontinued Date: October 14, 2008
Processors: 1 (2 Cores)
Processor Speed: 1.6 GHz Processor Type: Core 2 Duo (P7500)
Custom Speeds: 1.8 GHz Architecture: 64-Bit. Yes I do think they are more data cables. If unsure, plug your cable, or in your case, half the cable in. Remove the insulation on all of the ends. Use a multimeter connect the negative probe to ground and test the cables with the positive probe, and see what you get. It appears that not a lot of people have issues with that and information is sparse. I did check a few of the service manual, ad there is not even any mention of this. I am trying to look at the board schematic, and will let you know what I find, if anything.
из oldturkey03
Thank you very much for your help, oldturkey03. If I have time today, I will try to build a new cable with four wires and solder it to the thermal sensor board. I will assemble the laptop today or tomorrow.
из Sergio