HP Elitebook 745 G4 TRAVOLTA-6050A2834601-MB-A01 PRESENTED BY A DEALER FOR NO POWER ON

B+ LINE OK WITH  3VLDO SUPPLY  GOOD BUT NO 3V-5V ON RESPECTIVE COIL OUTPUTS.

U60100 PIN11 EN_3V MEASURED 0V

TRACE ENABLE SIGNAL TOWARD U900 PIN4 BY 2K2 RESISTOR.

PIN5 OF U900 HAVING 3VLDO BY U60100 GOOD,

REMOVED CHIP TO TRACE IT INPUTS-OUTPUT PATH AS SHOWN BELOW:

FOUND  RESISTOR 300K TO PIN5 OF Q7020 OPEN,

REPLACED NOW PIN5 Q7020 IS 6.27V AND 3V5V_EN BECOME 2.8V THUS ENABLE BOTH CONTROLLERS.

U900 GLUE LOGIC CHIP GOOD VOLTAGES ARE AS:

PIN3 3.3V,PIN4 2.8V,PIN5 3.3V,PIN7 3.4V,PIN8 3.3V

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