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Hello guys, I have a hot air station that is capable of supplying hot air up to 500 °C. What are the recommended temperatures of hot air when replacing IC chips on Macbook boards (for example U7701/LP8550)? Is the temperature the same when soldering BGA IC or any other component such as...

If this was a question for me, yes I made it work. I have soldered new U8030 which is TPS22924C load switch on PP3V3_S0. After that everything started to work fine. I have tested the laptop for about 2 hours when suddenly fan started running at full speed. It sems I had a bad luck and palm rest...

Hello 2informaticos and thank you for your explanations. I am a bit confused, because there are some other other sensors showing high temperatures such as airport and memory modules, which should not be connected and have something in common. Anyway, I have explained to the customer that laptop...

Thank you for the reply. The screenshot of HWMonitor is attached. There are problems with palmrest and airport(?) sensors. However since I don't have spare trackpad, I can only try to pull out ?plug in the flex cablegram the trackpad again. It seems there are no more options. Is that so? Is...

Ok, I have removed the the connector from the web cam and everything is the same. I also brushed the contacts of the flex cable for trackpad with alcohol a bit and that didn't help either. Yesterday, everything was working fine for about and hour or two, then fan suddenly increased the speed...

Hello 2informaticos, is ALS ambient light sensor or something else? Is there any way I can read sensors data or test it myself. I've seen this can be done in ASD, but I'm not sure how exactly.

Ok guys, here is the update. The donor board arrived faster than I expected. I have removed TPS22924 load switch from the donor board and I managed to solder it on the faulty board. This was no easy, since my hot air rework station is not exactly state of the art and the chip is 1.4 mm x 0.9 mm...

Hello, donor board arrives next Monday. In the meantime I thought to try to find an alternative solution. Never repair Mac before and I have a lot of PC laptop boards. I'm not messing with anything except maybe MS Paint. Everything that came to my mind I asked here first. This alternative...

At first glance, I rejected this idea, because I need to have MOSFET ON at 2.8 V( 3.23V-054V). But I saw that typical treshold voltage is 1.5 V and max 3 V for this MOSFET, so I made little experiment on a desk and it opens on about 2.7V, which is really at the edge. Probably, this will sometime...

Since U8030 is a load switch TPS22924C with the following characteristics: current = 2A Max, Ron = 25.8 mOhm at 2.5V and it will take more than a week to be delivered, I was thinking to use an alternative one with (what it seems to me) better characteristics. I think I can use FDS6676AS N...

In many of his youtube videos for beginners Louis starts by checking different voltages (page 62 in schematics). Usually first step is to check these voltages to find out which is missing.

Hello, if you remove battery and plug in charger, normal board booting is this: 1. Fan ON after few sec OFF two times 2. Fan ON and board started. If there is no FAN spin at all, try exchange the FAN. If touchpad is disconnected, because of palmrest sensor, fan is going to run at full speed. If...

Hello 2informaticos, I have order a donor board and will try to replace the U8030. It will take a couple of days.

Sorry about that, I started new thread because it was about interpreting labels on the schematics. You have explained it and I understand now. Thank you!

Hello guys, those who have the same logic board, can you please check if you have on your boards actual components like U8160 and Q8060 (among others)? I have received this motherboard for further troubleshooting after previous repair attempt. Now it seems that many components are missing as a...

2click, I have the same motherboard with similar problem with PLT_RESET_L not present and PP3V3_S0 only 0.54V. Can you please confirm me that there is actual R8162. It should be very next to R1950. On my board, this resistor is missing.

2click, you wrote in the beginning " computer arrived turning on but without video ". Did it make chime sound?

In addition to previously described, I have noticed that voltage on C6950/6951 which is PPVBAT_G3H_CONN oscillates. No battery is connected, the board with I/O board is on the desk. I measure 8.56 then it goes down to zero and then back to 8.56 and so on. But voltage on F7140 (PPBUS_G3H) is...

Ok, but right now for the purpose of testing and ruther troubleshooting, is it safe to short PP3V3_S5 to PP3V3_S0_FET_R on the place of missing U8030, just to see what is further behavior?

Hello piernov and thank you for your reply. Yes, I concluded the same regarding the history. As for corroded parts, there is a trace of teh corrosion only on place of C1930. This cap is no longer on the board and I don't think it is necessary to find a replacement cap. I do have PP1V05 and it is...