Recent content by PJs

I ruined this board by removing U3900 - I tried to be extremely careful and I successfully reballed the chip itself, but it was not possible to clean the underfill from board without ripping a few (not unconnected) pins. It still boots, but it will never work properly again. I'm unexperienced...

I got this one running by heating up the PCH U1800 with hot air. Heating up the other side of the board also works. When I heat it up somewhere over 150?C and let it cool for a moment, it turns on and works flawlessly for a few minutes. Then it shuts off and PPBUS_G3H is fluctuating again...

No other tips? I changed U9600 once again for a tested one and still no success. But today I saw the short white screen once again while testing - however it immediately cuts off during chime sound, whole board turned off and after disconnecting/reconnecting charger it had fluctuating...

Did you try installing macOS from flash drive and not connecting to internet until it's fully installed with user account set? Laptops bought from larger companies often do this to me, but reinstall without internet connection always solve this unless it really is stolen. Do not connect to wifi...

OK, I resoldered U8900 with leaded solder, still no image. After that I changed it completely and still nothing... I believe U8900 is OK as I get GPU Vcore. If you meant U9600 (GMUX), I reballed it with leaded balls, there was no oxidation under it or anything obviously wrong.

Cannot find any liquid damage, it chimes, caps lock working, nothing on screen (not even blink of image), nothing on external with known good SSD. Just once I've seen a short blink of white screen (with backlight) during chime - that's why I did not trash this board yet. When it came to me...

It turns on and chimes, has good CPU Vcore, but no PPVCORE_GPU (and it's not shorted to GND). Someone obviously messed with U9300, Q9330, Q9331 and Q9361 as U9300 has no bond on the edges and all of these had flux residues around. I changed all of them, but it's still the same. GPUVCORE_EN and...

OK, so after changing the chip and measuring everything accessible, it looked fine, so I successfully turned it on. So I guess the first chip was really defective. However the board boots, I can install OS, but after that it hangs on "critical update" issue and I don't know why (SSD is fine as I...

Of course, I measured PP3V3_TBT_T_S0 in diode mode before I connected PS and it was OK. It's burned exactly the same way as the original one - only PP3V3_TBT_T_S0 pads are shorted to GND pads.

I'm not an expert, but from my experience this is usually caused by a bad aftermarket battery. Change U7000 and Q7055 at once and never connect that bad battery again.

Hello, I've got an issue with 820-00928 (15" 2017), it came to me dead. Board has no corrosion, but someone obviously reflowed or maybe replaced U7000 and CB704 - I guess that's because Louis did this in one of his videos (it's funny how often I'm getting boards from other repair shops where...

This one came to me not powering on at all. There was no obvious liquid damage, but I found burned U8030 and no PP3V3_S0. So I changed U8030 and the board powered on with chime. After that I installed the board back to case and once I connected the charger to an assembled laptop, U8030 burned...

PPDCIN_G3H 16.65V PP3V42_G3H 3.43V PPBUS_G3H 8.58V PPVRTC_G3H 3.32V PP5V_S5 5.01V PP5V_S4_IPD 5.01V PP5V_S3 0.00V PP5V_S0 0.00V PP3V3_SUS 3.32V PP3V3_S5 3.32V PP3V3_S4 0.00V (not shorted) PP3V3_S3 0.00V PP3V3_S0 0.00V PP1V8_S3 0.00V PP1V5_S0 0.00V PP1V2_S3 0.00V PP1V05_SUS 1.06V PP1V05_S0...

I cannot figure out this one and I've got a feeling that this is just some stupid mistake I'm doing over and over again :D No liquid damage, oxidation, signs of previous repairs or any other damage anywhere in this laptop, system board looks almost like a new one. Customer says it just did not...

No Title Yes, it boots into ubuntu and even W10, but there are visible lines on grey color (look at the photo). In W10 there's only one GPU in device manager and that's dev_0fd5 which is GT650 I believe (driver is missing, so it's using some Microsoft generic one). So those artifacts are not...