Recent content by 2informaticos

Discarding "NC" marked ones, you still have more to check; page 44, VLDO2/7/8/9/10.

Check diode mode to ground at backlight output with internal LCD connected (JP600). I suspect T-CON damage...

Check if starts with a charged battery.

Having short to ground on 2 different power rails, points to NANDs, or U9000. Remove L/R9030 and check again in diode mode at C9030. If still short, dead NANDs. BTW, connect ALWAYS red probe to ground when checking in diode mode; you will never get OL reading!

Any history available? May have NAND issue...

None of U8100's LDO present? LDO11 is derived from a buck, but all other LDOs must be present at same time with 3V8_AON.

Replace L7800 and test again.

Both USBC ports with exact same behavior? Do you mean all U8100 & U7700 LDOs are stable?

Possibly corrosion under U3100_R, or even bad chip. Check diode mode at C3105/6/8.

Did you check again diode mode at PPBUS_G3H and L9081?

https://drive.google.com/file/d/1onOfc-Gunylnd5x_-X3IjcMtT4GTorBK/view?usp=sharing

"UPC_W_Reset, pad is almost destroyed" That is not a problem, is just a test point. Please specify the CD3217 which reset the power meter. Also check diode mode to ground at L9020/30/80.

All mentioned pins are probably connected to VBUS. Do you get any voltage at J5401?

Only 02918 is available. Not sure if that can help you...

"I couldn't get the center ground pad to melt" U9080 doesn't have such central pad, only very small balls. I recommend you to practice on scrap boards, before going into real repair process. This way you can properly adjust air flow and temperature of your hot air station. "-PPBUS_G3H (at F7000...