-
For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.Subscribe Now
a1707 820-00928
- Thread starter Vennela
- Start date
First of all, welcome to the forum!
All 4 CD3215 chips affected by liquid?
Post voltage and diode mode to ground at LDO rails of CD3215 chips.
Do you get 3v3_G3H at least?
All 4 CD3215 chips affected by liquid?
Post voltage and diode mode to ground at LDO rails of CD3215 chips.
Do you get 3v3_G3H at least?
Actually cd3215 not affected by water. See picture. Only corner area . Water . I cleaned well . Checked any resistance disconnect. All good. And all boltages on 4 cd ics fine. I double checked, gr value also fine. ( injave an working board copared gr ok). 4 ports 5v looping. . Same issies have 2 boards.
Please, take your time and write correctly.
We need to understand you, if need help.
You've replaced the 4 chips, even not affected by liquid, why?
So you get now 1V1 LDO_BMC on each chip?
Check diode mode to ground at F7000/1; be sure the fuses are good.
Connect known good battery (with some charge) and check voltage again.
Check if board tries to turn on in this case.
Also check if USB-C ports switch to 20V, if battery is present.
We need to understand you, if need help.
You've replaced the 4 chips, even not affected by liquid, why?
So you get now 1V1 LDO_BMC on each chip?
Check diode mode to ground at F7000/1; be sure the fuses are good.
Connect known good battery (with some charge) and check voltage again.
Check if board tries to turn on in this case.
Also check if USB-C ports switch to 20V, if battery is present.
No, try its battery first.
But need to test with known good one, which also holds some charge.
But need to test with known good one, which also holds some charge.
If fan spins, check voltage on big coils.
Measure L7211 start voltage and after 10-15s, if present.
Measure L7211 start voltage and after 10-15s, if present.
Try to catch voltage when fan spins.
Check if voltage tries at least to appear at L7900/60, L7330 and L7211.
Check if voltage tries at least to appear at L7900/60, L7330 and L7211.
L7900 voltage should appear before fan starts to spin even.
Check diode mode to ground there.
PM_SLP_S4_L should be present.
Remember to check when fan spins...
Check diode mode to ground there.
PM_SLP_S4_L should be present.
Remember to check when fan spins...