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I am having difficulty removing U8100. Could you please provide some advice?

Understood, I will try replacing U8100.

I measured the resistance and got the following results: MPMU_BSTLQ_LX: 0.3Ω PP3V8_AON_VDDMAIN: 28.5Ω The resistance for PP3V8_AON_VDDMAIN is gradually decreasing.

I lifted L8300 and checked, and both sides are shorted.

I used a PSU to inject 1V from C5894. Since L8300 was hotter than the surrounding components, I replaced it, but the issue wasn’t resolved. Could you please advise? I have a cooling spray. Should I also check the covered areas like UF100 and UF000?

I have obtained a PSU and I also have an IR camera. Could you please tell me which component I should start injecting from?

Sorry, I do not have a PSU. Could you please suggest another method?

Sorry for the oversight. After checking, the ohm value is 0.4Ω I also have a HIKMICRO thermal imaging camera.

Thank you for your reply. I apologize for the inconvenience. If the PP3V8_AON_VDDMAIN line is shorted, is there a way to find the cause without using a constant current source?

Thank you for your advice. Thanks to your suggestion, I was able to remove L8121. Upon rechecking, I found the same results as before. L8100→0.017 L8110→0.021 L8120-1→0.449 L8120-2→0.019 L8230→0.305 L8270→0.179 L8280→0.106 L8290→0.226 L82B0→0.059 L84E0→0.278

I was able to remove the L8120 component, but I’m having a hard time removing the L8121 component from the motherboard. Could you please give me some tips on how to do this? I removed and checked the L8120 and R810C components. Here are the results: L8100→0.017 L8110→0.022 L8120-1→0.449...

Thank you for your guidance.I will report back with the results.

Thank you for your guidance. I understand now that the readings in diode mode are not actual voltages, but are generated by the multimeter which injects a constant current on the board. I will make sure to avoid using "V" after diode mode readings to prevent any confusion with voltage checking...

Thank you for pointing that out. ◾️U8800 L8100→0.017V L8110→0.020V L8120→0.019V L8230→0.305V L8270→0.177V L8280→0.104V L8290→0.224V L82B0→0.058V L84E0→0.277V ◾️U7700 L7740→0.036V L7750→0.225V L7760→0.348V L77A0→0.137V L77C0→0.307V L77D0→0.250V L7800→0.155V I’ve compared the results with the...

I apologize for any inconvenience caused. The diode mode readings for these outputs are as follows. CC101-1 0.484V CC121-1 0.410V UC810-3 0.485V UC820-3 0.308V UC820-5 0.381V UC840-5 0.189V UC840-6 0.635V UC850-5 0.189V RC851-2 0.472V CP860-1 1.085V I compared it with the reference table and...

I greatly appreciate your reply. Your assistance has been extremely valuable. →With the charger connected, both CC101-1 and CC121-1 measured -00.1mV. →Even with the charger connected, the voltage was nearly 0V. UC810-3 00.4mV UC820-3 00.5mV UC820-5 00.1mV UC840-5 00.0mV UC840-6 -00.1mV...

I appreciate your guidance so far. However, I’m still feeling a bit uncertain about whether I’m following the correct procedure. Could you please provide me with more specific steps or methods to check the secondary power supply? I apologize for any inconvenience and truly value your expertise...

Thank you for clarifying that the pages 36 & 40 refer to the schematic. I appreciate your guidance and will make sure to focus on these pages in the schematic for my readings.

Thank you for your feedback. I realize now that my approach may have lacked the necessary logic and I will strive to improve this in the future. I understand that my previous posts may not have been helpful and I appreciate your patience. Regarding the readings from pages 36 & 40, I believe...

Thank you for your advice. I will check all of them and compare with a good board (in diode mode) or reference tables. I will start with the 3V3/5V_S2 lines and backlight as you suggested. I will get back to you with the results.