Russound CA4 Power Supply Repair

[CMCM]

Hello Everybody,

Trying to repair a power supply from a Russound CA4 Multizone Controller (picture attached)

Russound no longer supports it but were kind enough to provide a schematic of the power supply (pdf attached).

The outputs marked 12v and 20v are all measuring only 1v.

The board is clicking, which I think means it is in something called hiccup mode when the flyback transformers switches because of an internal problem or something else on the board Overloading it.

The capacitors physically look clean (no bludgesor leaks) and...

[max2711]

Hi,
i need EC dump for
Lenovo Legion Y540-17IRH-PG0
NM-C541
IT8226E-192
Thank You

[kuba2102]

Hello people. I have undertaken an upgrade from 256GB to 512GB. I have another A2681 board that I sourced NANDs, resistors and capacitors from. Yet when I try to restore the firmware in FDU mode I get the error 0x23 (35) (error formatting the NAND). Could it be the faulty NAND or I have missed something? Thank you...

[circuito]

Hello everyone,

I got a APC UPS SRT2200XLI showing General system error 0008. It's supposed to be related to the logic power supply. I checked all I could, but because of lack of documentation I'm going blind.

Any help will be appreciated.

Daniel






...

[Stachujones]

Hello i have a problem with a ThinkPad X280 with NM-B521 Motherboard, laptop doesnt power on
I dissasembled IT and started Basic trouble shooting
+20v is getting to board so power delivery circuit is working
Next i started looking on the board and i felt a burning hot chip its BD4179 "ThinkEngine"
I desoldered it, no more chips are getting hot
But i founded that on the capacitor marked on the picture there is 0.8 ohm short to ground and it's not capacitor, after desoldering it it's Still 0.8 short

Could anybody help me with fixing this laptop...

[Gado229]

Hello everyone, I have an MSI MS-15P3 Pulse 16 AI C1V that boots, doesn't display, and then the fan spins rapidly.
Can you help me find a working file to flash?
The old main BIOS file is attached.

MSI MS-15P3 Pulse 16 AI C1V
SN: K2411N0110648...

[Chivo77]

hello friends, I have a DELL LATITUDE 5420---MODEL P137G, ST 20TFKN3 LA-K491P REV:2.0 (A01) and its quite a challenge. It powers on with the battery disconnected, lasts on for about 15 secs, and then shuts off. It does the same with battery only (no adapter). With battery and adapter it sometimes starts after hitting the button several times. It displays nothing in every case. Since only the Boardview is available, I guided myself with schematics similar to this laptop (I'll add them down).Some measurements:

1- After receiving power SIO_SLP_S0# goes high and never changes.
2-every...

[Slavol]

Hello, I would like to ask for a BIOS repair, or write DMI to clean BIOS from the MSI website.
In the original BIOS after replacing the PCH it does not see m.2 drives and does not work USB - in clean BIOS from MSI is no SN, product name and WK, I can't do this
I write the WK, but I have a problem with the rest DMI. I am attaching a screenshot of the damaged and clean BIOS from MSI
SN: K2104N0103021
Thanks ...

[kwameasumadu]

Hi. I was surfing online regarding semm and uefi unlock. I bought surface go from a car boot sale and after formatting im seeing its locked to semm and uefi. I was hoping if you could help me clear it. Serial number is 016086784451

[Maicon Provin]

Can anyone clean the bios of the gigabyte RC55 notebook S/N:SN23091J000287. NP50RNCY0-D01-B motherboard.
The notebook is stuck on the logo.
I would appreciate it if someone helps me....