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A1707 / 820-00928-A Won't boot
- Thread starter BillyE
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1.1 LDO only appears on the powered port.
All USB-C channels must have same behavior.
Seems that you have problems on U3100/200 area.
Compare diode mode readings on LDOs of all CD3215 chips.
All USB-C channels must have same behavior.
Seems that you have problems on U3100/200 area.
Compare diode mode readings on LDOs of all CD3215 chips.
When you have two shorted rails, the most probably culprit is the common component; U3200 in this case.
Do you really think to have 2 caps shorted (not even connected in the same rail)?
Do you really think to have 2 caps shorted (not even connected in the same rail)?
Don't you have old Mac boards in stock?
Search an workshop on your area.
You may have luck to find someone that can sell you a scrap board; or required components only.
You may have luck to find someone that can sell you a scrap board; or required components only.
Is a capacitor, what do you expect to show in diode mode?
Try to achieve basic electronics knowledges...
Try to achieve basic electronics knowledges...
All the other capacitors show a value in diode mode but this one? Shouldn't it show a voltage drop across the capacitor?
I did find the other resistor I needed so I can attempt to put the U3200 back on. My SMD skills are terrible so I have little hope but gonna try anyway, it's the only way to learn. But the capacitor showing OL bothers me. I hate to be stupid but what am I missing?
I did find the other resistor I needed so I can attempt to put the U3200 back on. My SMD skills are terrible so I have little hope but gonna try anyway, it's the only way to learn. But the capacitor showing OL bothers me. I hate to be stupid but what am I missing?
ALL CD3215 MUST be soldered on the board; and in good working condition.
Do not compare diode mode reading for a lonely capacitor with the one soldered on the board.
Even onboard, C3205 remains alone once U3200 is removed.
When you check onboard components in diode mode, the reading is affected by ANY other component connected in same point.
So difficult to learn something about capacitors with Google?
Do not compare diode mode reading for a lonely capacitor with the one soldered on the board.
Even onboard, C3205 remains alone once U3200 is removed.
When you check onboard components in diode mode, the reading is affected by ANY other component connected in same point.
So difficult to learn something about capacitors with Google?
ok, I give up, I'm sure a pro could repair it, but it's not worth the effort. I tried to put a new CD3125 on and it didn't sit right, and while trying to remove it and clean the pads I got to aggressive trying to remove the solder from the pads and damaged a couple of pads. I tried bending some fine pieces of wire to make a new pad, but I don't have the dexterity and even if I did trying to get the "new" pads epoxied down level with the factory pads would be a nightmare. Oh well I learned a lot. Far from ready to fix much, but it's a start. I need a lot more practice using a SMD rework station! This is just such small stuff to work with it's gonna take practice. I appreciate the help but it's just over my head at this point.