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Need pre v1.6 R5N1 resistor value


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I have a BGA rework station and decided to upgrade the CPU in my v1.0 xbox because why not. The operation went fine, except when removing the awful plastic clips for the heatsink attachments, my screwdriver slipped and knocked off 2 components. I did not notice this until after the operation.

One component knocked off was the RP5N1 100 Ohm terminator block for the RAM. This was easy to replace. The other component knocked off was the R5N1 resistor.

xbox_r5n1.thumb.jpg.f1737386a7715178180c0ca2754ca751.jpg

None of the resistors around it report any consistent value, so I can't just guess at it. A 128MB RAM upgrade guide here https://quade.co/2018/xbox-128mb-ram-upgrade/ actually has a picture of this resistor with the value printed on it, but the image is too blurry to read. On v1.0 this resistor is just blue with no value, but it looks like some version between 1.1 and 1.5 actually has the value printed on the resistor. If I could get that value, then I can fix the FRAG. I would hate to buy a 1.0 board just to get this resistor value.

I would really appreciate it if someone could get me images of the resistor value. It cannot be measured with a multimeter as one end has a really big cap on it, but maybe getting that reading would still be useful to me to narrow guessing at values (resistance will be something higher than what is read).

Also lesson learned: When removing the heatsink bracket screw clips, just chop them off and replace them with screws/nuts. It's way safer for your board.

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On 2 different 1.0 boards R5N1 tests as 172.5 ohm

4 hours ago, Khenglish said:

my screwdriver slipped and knocked off 2 components.

That's a big slip.

4 hours ago, Khenglish said:

when removing the awful plastic clips for the heatsink attachments

There is nothing had about removing the clips that hold the bracket on the PCB, Pull the pin out of the center 1st then the body of the clip almost falls out.

 

Cheers

SS Dave


Soft modding is like masturbating, It gets the job done but it's nothing like the real thing.

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I tried 200 Ohms and I got a bit of a buzzing sound, which seems incorrect. I have resistors to work out 180 Ohms and will try that next.

This R5N1 resistor connects to a voltage regulator with transistor U5B1 that outputs 9V. The equivalent on a v1.6 outputs 5V. This is concerning, however in general v1.6 voltages run lower than other revisions, particularly v1.0. (v1.0 northbridge/gpu and southbridge voltage is 1.66V, while on v1.6 these are just 1.32V). The presence or absence of R5N1 does not have an effect.

@Benur75 What do you mean a mobile P3 won't work? I have read that it works without mods, but runs at the lowest multiplier due to GHI# not being set. It's hard to get specifics from people though.

The next plan is to just put the original CPU back on. These old boards are easy to work with compared to modern crap with .4mm solder balls so it's not that hard to do to see if the board is ok.

Edited by Khenglish
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