What is this mystery piece I found inside a PS4's optical drive?I'm fixing up a PS4 and I found this piece rattling around inside the optical drive. Does anyone recognize it? Is it even...
Antwort auf „Hardware test code identification”Hi John, Sounds like a current sense circuit is still reporting an incorrect value and the OS is continuously getting an interrupt for it. I recommend giving your logic board more cleaning, focusing on areas around the battery connection. Any slight changes in the impedance of the current sense resistor caused by foreign contaminants can wildly throw the value off. Thinking about it further, we could narrow down the problem by trying to run the laptop without a battery. This should prevent any of the power management circuits relating to the battery from reporting anything (as it shouldn't be active). If our suspicion is correct, the 4SNS IPBR sensor shouldn't report anything. Could you give that a try? Regards, Michel
Antwort auf „What is this mystery piece I found inside a PS4's optical drive?”OK! Here are some pictures of the fix. I wasn't able to find any pictures of the inside of the drive at all when I was doing my initial Google searching so this should be very useful for someone who might have this same issue. To get to the rollers, simply unscrew the four Phillips head screws that hold the gear train assembly in place; the entire assembly should come off. The piece is basically just a linkage for the two rollers in front so that the rolling action is distributed (only one of the rollers is connected to the rest of the gear train). Without the piece the roller shown on the left wouldn't move, causing more strain on the right one to push the disc out. It's pretty darn loose fitting and I can see how it might pop out easily if someone grabs the disc while it's coming out or if someone pushes a disc while the PS4 is feeding it in. I just had to pop the left roller out, insert the plastic piece in between, and pop it back in. Voila!
Antwort auf „Hardware test code identification”To correct machead3's answer: 4SNS is not specific to a temperature sensor but can either be a current (I), voltage (V), or temperature (T) sensor issue. In this case, we have a current sensor since the identifier starts with an I. You can read more about it on this great CNET article. The article goes onto say that the second letter identifies the component. P, in this case, is associated with the "power bus", meaning there's an issue with a over or under-current somewhere in the power bus. I am experiencing the very same issue and this is as far as I've come to troubleshooting it. What's eerie is that my computer also exhibits the very high kernel task which is making me think a low-level interrupt handling is hogging up all the CPU time. My computer will only boot up if the power button is held down and the chime is allowed to play, otherwise the sleep/power light briefly turns on and then off again. My problem came about from liquid damage so I am going to try an isopropyl alcohol bath tomorrow to see...