EsteTron
Member
Client brought in device after device was liquid damaged. Noticed a build up of corrosion around U6903 which appears to be where PP3V3_G3H is created, and a blown Diode D6902.
First thing I did was give device an ultrasonic cleaning to remove the corrosion to get a better look. After which, I replaced D6902 since it was severely blown. Images of before and after cleaning attached below. Device still would not boot, so I then applied alcohol around there area and injected 3V using a DCPS on to D6902 and discovered that C6906 was shorted. I have removed and replaced the shorted C6906, however device still does not boot.
U7000 is sending 5V to PM_EN_P3V3_G3H to Pin 10 on U6903. (Is this voltage too high?)
Pin 2 on U6903 is being supplied 4.2V from D6902, however D6902 is being supplied 5.2V on PPDCIN_G3H.
I believe U6903 is bad and is pulling down voltage.
Pin 9 on U6903 P3V3G3H_FB is outputting 0.66V,
Pin 3 on U6903 P3V3G3H_LX Is outputting 2.2V.
USB-C Ammeter reads 5.2V with .0A consumption. I applied some more alcohol around U6903 and injected 3V on PP3V3_G3H with a .05A Consumption. I am currently waiting for some replacement CD3215 to arrive, but until then, any suggestions on what else I should be looking for? If U6903 truly is bad, I found some replacements on DigiKey.com
Thank you in advance!
First thing I did was give device an ultrasonic cleaning to remove the corrosion to get a better look. After which, I replaced D6902 since it was severely blown. Images of before and after cleaning attached below. Device still would not boot, so I then applied alcohol around there area and injected 3V using a DCPS on to D6902 and discovered that C6906 was shorted. I have removed and replaced the shorted C6906, however device still does not boot.
U7000 is sending 5V to PM_EN_P3V3_G3H to Pin 10 on U6903. (Is this voltage too high?)
Pin 2 on U6903 is being supplied 4.2V from D6902, however D6902 is being supplied 5.2V on PPDCIN_G3H.
I believe U6903 is bad and is pulling down voltage.
Pin 9 on U6903 P3V3G3H_FB is outputting 0.66V,
Pin 3 on U6903 P3V3G3H_LX Is outputting 2.2V.
USB-C Ammeter reads 5.2V with .0A consumption. I applied some more alcohol around U6903 and injected 3V on PP3V3_G3H with a .05A Consumption. I am currently waiting for some replacement CD3215 to arrive, but until then, any suggestions on what else I should be looking for? If U6903 truly is bad, I found some replacements on DigiKey.com
Thank you in advance!