Lenovo S130 ideapad motherboard - need capacitor value.

[robbak]

Have an S130 notebook that won't power on, tracked it down to a cracked and shorted ceramic capacitor. Removing the cap has cleared the short, but the cap is in the middle of what appears to be power supply circuitry, so I don't think I can write it off as a redundant bypass capacitor and proceed without it - although it does appear to be decoupling U600, which looks like a switching device to me - lots of power pins shorted together.

The notebook is a S130-141GM. Numbers on the board - rather cyptic - are P. & Q 1833 CM-4 94V-0 E162264 P/N:431205215020
 S130/130S_GLK_MB_LPDDR4_V10

S130-4G+128G-08131-4300-2946

I'm attaching photos - the capacitor is marked with a big red arrow and a square, on the top of the board. Any way I can identify this capacitor?

[amyk]

What are the labels on U6001 and U6002?

[robbak]

U6001 is marked 'BACAJG', and U6002, 'AWVAKD'. Their surrounding circuitry looks identical, and those numbers look more like serial numbers that part numbers.

[wraper]

Desolder nearby capacitor which is connected in parallel to it and measure its capacitance as it should be the same type.

[gamalot]

AWV*** should be SY8286A and BAC*** should be SY8288A. I only found the data sheet of SY8286, but I guess their external circuits should be similar.

https://datasheetspdf.com/pdf/1297122/Silergy/SY8286A/1

[amyk]

Look for "LA-C371P" schematic. Not your laptop but it uses SY8288RAC on 1.5V and 1.05V, and SY8286BRAC on 3V3 and 5V.

[robbak]

Thanks, everyone:

wrapper: OK. Don't really want to be putting unnecessary heat into this board if I don't have to.

gamalot : Thanks, that's a big help. So, that confirms that they are bypass capacitors. The datasheet recommends a 10μF ceramic capacitor - This has two in parallel. I thought they were different sizes, but I just double checked, and they are the same footprint, and look to be the same thickness. I don't recognize device sizes at a glance, but with solder it measures 2mm × 1mm pretty exactly. About 0.8mm thick, by my horribly cheap plastic vernier!

Would a pair of 10μF capacitors make sense? Now I know they are bypass caps on the input side, I am confident that the value isn't critical.

amyk: Hmm.That schematic lists an array of a parallel 2.2n, 0.1U and 10U capacitors.