DELL 13269-1 Laptop Does Not Trigger (DEAD CONDITION)

 

Laptop Model: DELL 14-3442

Version number: 13269-1

Fault : The notebook does not trigger and the standby is too high (0.04)

Maintenance process:

 Remove the motherboard and check that there is no burnt appearance or traces of water intrusion. The standby value is 0.04, usually due to short circuit or lack of voltage.

    When plugged in and measured, the common point is 19V, which is normal. The 3V inductor measures 0.59V, and the 5V inductor measures 0V.

Adjust the diode level to 3V5V with no short circuit to ground.

Open the drawing and measure the chip conditions. VREG3 3V is normal and VREG5 5V is normal. EN1 EN2 3.3V is normal, VIN 19V is normal (don't measure VIN just because the linear output is normal, you might be surprised).

Replace the chip directly, plug it in and wait for 0.0093, trigger code running, the connected screen lights up, and the repair is completed.

　　Supplement: Don't worry about the 0.59V on the 3V inductor before repairing it. I have encountered similar problems before and made detours, so I just ignore it this time.