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Model A1237 or A1304 / 1.6, 1.8, 1.86, or 2.13 GHz Core 2 Duo processor

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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 (?).

Ответ на этот вопрос У меня та же проблема

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what are the last three digits of your computer? This would help to identify your computer properly.

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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

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.

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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

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.

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Sergio, I am not a Mac person so take this answer as more of a general answer. The cable and that small circuit board look like the thermal sensor board and cable. Apple part number is 820-2257-A. This would also correspond with your 3 beeps. As you correctly stated, the three beeps usually are a RAM problem. Apparently your computer model will give you the same issue when it has trouble with temperature or with the sensor. We had a question about this on here once before. Check this question and look for the answer from "Zdravko ". Sure looks like your issue. Hope this helps, good luck.

UPDATE

Sergio, take a look at the schematic from a thermal sensor. Your wires should be connecting the same way. Again, hope this helps.

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Maybe I was wrong about the VDD and GND for the thermal sensor. Now that I know what it is I have been looking for similar sensors in other apple laptop models (I find nothing for mine) and most of them seem to use two sensors (left and right) and each of these sensors has two wires (normally different colours, well done Apple:-( ). So, maybe these sensors do not need supply and ground and mine has the two sensors in one unique board. I will try to solder the four wires left to right (I hope they didn't cross the wires) and, if it doesn't work, I will try right to left.

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any chance you can post a reasonable close up of the smaller board?

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I will try. I use a magnifying glass for soldering, not sure if I can get a good picture. In the worst case, you can see the picture I linked in the main post and I will write here the letters on the chip. On the board there is only one chip (with 6 pins) and one SMD capacitor. I don't remember the letters on the chip but I will check it. My idea now is cutting the four black wires (leaving some milimeters from the plug) and solder there four cables in diferent colours. If I manage to fix this problem I will post a picture and an explanation here. It is not a common issue and the laptop is quite old but who knows, maybe someone faces the same problem in the future. The small board with the cables and plug cost something around 50-60€ in some websites. Crazy price when you can buy complete (used but working) logic boards for 150€ .

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Where did you cut the wire.? Right at the board? I would use some alligator clips between the wires and see what you get. That is whay I was thinking of a picture of your board, to see where the damage is:-)

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Yes, the cut was basically at the board. Big mistake on my side. Yesterday I cleaned the sensor board and now it is ready to be soldered again. I think it is easy to solder four new wires to the board. The soldering points are clear and the board is not so small. I can use the grabbers between the new wires (once they are soldered) and the four black wires on the plug side. I had small grabbers somewhere.

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