The 2 caps in parallel should be fine to use. When you parallel the caps, the capacitance adds up but an added benefit is that the ESR (equivalent series resistance) decreases to allow for higher currents to be supported by the cluster of caps. In your travels, when you order parts, consider to source more of the 22uf caps to service the machine but as noted, you will not miss out by using the 2 x 10uf caps in parallel.
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Noted. Thanks again. So the 2 uF difference is not a problem at all?Comment
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For decoupling caps on a power supply rail, it usually doesn't matter, it's within 20% tolerance anyways (20uF vs 22uF)Comment
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Thanks man.Comment
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Correct. Tolerance and other factors impact the true capacitance.
Review this great article originally from Maxim Semiconductor:
https://www.analog.com/en/resources/...capacitor.htmlComment
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Hi guys
I have a MacBook Pro A1990 that takes 4.9 Volts and .592 to .615 amps on one port. The other port on the left side power cycles with about the same amount of volts an amps but quickly power cycles. The same thing happens on the other side but opposite. So on the left side the bottom port stays on and on the right side it's the top one. I think it is a CD3215 chip but I am not sure how to test it or where to get one. I have checked for voltage at ppbus_g3h and it has 12.6 V which is also on fuses f7000 and f7001 I checked pp1v2_s3 and it has 1.2 V then... -
Hello,
This Macbook Pro 2018 boots up and then gets stuck on the logo.
All the normal methods of resetting this Macbook have been tried but do not work.
I cannot get into recovery mode and there is no bar displaying, it's just the white logo on a black background.
Any help would be greatly appriciated.... -
First time looking at a logic board this closely, learnt enough from videos and forums here to be dangerous
I was doing a OS update when the screen went blank at some point. Does not seem to be in DFU mode (checked using apple configurator).
PPDCIN_G3H is 5.16V
PPBUS_G3H is 0.045V
Resistance between TP_PPBUS_G3H and ground is 23.8 Ohms (which seems low)
F7000 and F7001 seems fine.
From what I learnt seems like there might be short on the down side on PPBUS_G3H.
Is injecting low voltage and see what... -
hi Friend
MACBOOK A2141
stuck 5.16v. 0.40amp con tester type c
but have
PPBUS_3GH :12.28 volt - 7.89volt aleatorio
PP3V3_G3H:3.2 Volt
PP5V_G3S : Missing
disconnected fuse : PPBUS_3GH : 12.30volt
where did you continue friends -
Hey....
Board as written in description was stuck at VGA LED. common Problem wit these type of bords.... tried all the "standard stuff" like resettin... reseatin.... found out the LED Controller MCU1 = IT8295FN-56A geting burning hot under the last PCI Slot.. now i desoldered it cause there were only 18 ohms at the caps arround.... another aorus x470 in working condition with similar part and nearly same layout had arround 280 ohms...
my question is: why doesnt the board start know without this chip.... worked myself through the boardview but i can´t understand...
Comment