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DELL 14236-1 notebook does not trigger repair.
Machine model: DELL 14236-1
Fault symptom: the notebook does not trigger.
Maintenance process: after inspection, the common point 13.6V is normal, and the standby 3/5V is normal.
DELL 14236-1 notebook does not trigger maintenance Figure 1
Refer to the drawing of LA-D071P to check EC, the switching voltage jumps from 2V to 2.8V, LID 3.3V is normal, and the opening signal from EC to the bridge is 0V and RSMRST 0V. If there is a brush BIOS on the forum, it will be triggered, provided that the reading voltage of BIOS power supply is normal.
And my board is not normal, 0.4V for a while and 0.8V for a while, it must be normal standby, so the BIOS power supply is not normal or short-circuited or the conversion voltage is not coming.
DELL 14236-1 notebook does not trigger maintenance Figure 2
In the picture, the U4101 secondary power supply chip is not installed, but a 0 ohm resistor is used for direct connection, and an inductor is found for direct welding.
DELL 14236-1 notebook does not trigger maintenance Figure 3
You can’t see it without careful observation. It was installed and tested, and the machine was successfully turned on.
DELL 14236-1 notebook does not trigger maintenance Figure 4
