820-00165 - Liquid Damage

[baker_jeff]

820-00165 - Terrible coffee damage
First time I had to use the USC in quite a while. It's nice and clean now, but a handful of areas were affected I'm trying to work through.
The first problem was PP3V42_G3H was shorted. I injected to try and find it... and the board got very hot on the left side and then cleared the short on it's own. Still not sure what exactly caused it. I'm now reading 0.001v, but not shorted.
Going through the steps now:
https://logi.wiki/.../G3_to_S3_State_for_Ivy_Bridge...

PPDCIN_G3H is 16.2v ... link says it should be 14.5. Is this concerning?
DCIN_ISOL_GATE_R is 6.8v as it should be.
CHGR_ACIN is 4.3v instead of 3.3v...
CHGR_DCIN is also 16.4v, is that too high?

 

[2informaticos]

Concerned voltages depend by charger type (powr).
You are using 60W probably; however is nothing to worry.

Post diode mode for 3V42 power rail and U7090 voltages.
Be sure both R7095/96 are good, as traces too.
What about PPBUS_G3H voltage?

 

[baker_jeff]

Ah ok thx, I am using genuine 85w charger.

Diode mode 3v42 is 0.311

U7090:
...
Went to measure and noticed R7080 was wiped off the map. Replaced... and I have green light and fan spin. I'll report back if there are further issues.

As always, thanks

 

[baker_jeff]

Ok. So last night it did power up and give me backlight. This morning, I get fan spin, but no image or backlight. USB mouse does light up.

 

[2informaticos]

Use an USB pendrive with Link LED to confirm USB activity,
A mouse is not the best test.

 

[baker_jeff]

Plugged in external HDD.

 

[2informaticos]

The board is not booting with 60mA.
Check for any missing, or incorrect secondary voltage.

 

[baker_jeff]

I inspected the entire board very carefully and touched up any nasty solder, replaced a couple sketchy components. Board boots up nicely every time now. On to the next!