sony PCG-61411L WITH POWER LED BLINK

[businessmind1988]

Hello my fellow tech a client brought this Sony laptop with power fault, when i press the power button the power led keeps blinking and the CPU fan spins for seconds and off

it's my first time with such issue and can anyone pls help me out with what to check?

mobo number is mbx-226 rev 1.1

thanks in advance

[mon2]

Re: sony PCG-61411L WITH POWER LED BLINK

Remove all power & no battery. Meter in resistance mode.

Measure the resistance to ground of each coil / inductor on the board. Each coil is linked to a local switching power supply. If the resistance is too low, there is a shorted part on that rail and causing the current to spike and then that power rail will shut down.

The low voltage rails will be low resistance by design. Post all suspects.

Next, with the power adapter attached, meter on dc volts mode (20v or higher), measure the voltage of each suspected coil to ground.

Be sure that you are using the recommended power adapter.

[businessmind1988]

Re: sony PCG-61411L WITH POWER LED BLINK

without power adapter attached i put my meter on continues mode to test all coils

PL5=no reading
PL18=003 omh
PL16=020 omh
PL17=020 omh
PL21=008 omh
PL14=no reading
PL15=no reading
there's a coil close to the battery conn it gives no reading too



with 20v adapter attached i get no voltages on all coils but when you press the power switch the power led comes on for a while and goes off