820-01987-A no power 5 volt

tipoti

Member
hello,

There was some corrosion in the R6900 area from liquid contact. I cleared the area. Currently, the device draws 5.227 v 0 amps. PPBUS_G3H 12.28 voltage


PPVIN_G3H_P3V3G3HRTC_R : 12.28 Voltage
CHGR_EN_MVR_R : 5 volt
P3V3G3HRTC_PGOOD : no voltage
L6900/01 : no voltage

Can I say that there is a problem with the U6903?
 
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tipoti

Member
0.372

The device was turned on yesterday. It just reopened but now it won't open again
 
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2informaticos

Administrator
Staff member
Check all components and traces around U6903.
Pay atention to R6910-13.
If all good, remove U6903 and resolder its pads.
Change it, if still same problem persists.
 

tipoti

Member
R6910-13 VALUES NORMAL

PPVIN_G3H_P3V3G3HRTC_R : 12.28 Is the 12 VOLT value normal?

Is the problem definitely caused by the U6903?

Is it normal that the device does not turn on from the battery? Is it a problem caused by the U6903
 

2informaticos

Administrator
Staff member
PPVIN_G3H_P3V3G3HRTC_R is a VIN voltage, derived from PPBUS_G3H.
12.6V is the correct voltage, when MLB is in good working condition.

If you don't get L6900 voltage with charger, why would you expect it on battery alone?
 

tipoti

Member
hello,


I did the part replacement. The device is turned on. But when I insert the battery screw, the device does not turn on. The battery flex cable is not attached, I just insert the screw and it won't turn on. Is this a battery problem?

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2informaticos

Administrator
Staff member
Battery is not enabled until data flex (J6951) is connected.
Just in case, check if Q7065 is shorted D-S.
 
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