If someone helps me with the scheme please lenovo
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Hello, I have this board in question. When I connect an AC-DC adapter charger (without a battery), the consumption is 19mA, with only +5VALW and 3VL present. When I press the power button, all voltages appear OK, the consumption rises to 260mA and remains stable. There's no video.
My question is if anyone has this board or information on the power-up sequence, and if the other ALW voltages are present when the load is connected.
What I noticed is that at first, 3VALW and 1.8VALW appear for a second or less. The BIOS is never read. Even so, the BIOS has been reprogrammed... -
Hey everyone,
I'm currently working on a mid-70s Sharp Electronic Digital Clock Radio, Model FY-70CH. I found the service manual online, printed it out, and have been studying it for a while. My main reasons for tackling this are: (1) I want to learn electronics and figured I'd start with something I had on hand, and (2) I want to fix its issues. Right now, the radio sounds awful, has about 5V DC at the speaker terminals, and the alarm time setting doesn't work. But I'm not asking how to fix these problems.
Instead, here's what's been bugging me so far:
The schematic... -
Ii wonder if anyone can help me. I have a Acer x163w monitor which is not powering up. The PSU main capacitor's one leg had completly come off - I replaced it but the PSU is still not outputting DC. I found the monitor in questions service manual here on manuals lib but the schematic in there is a completely different - the schematic shows no mosfet to drive the transformer while the one I have does use a mosfet - also the schematic shows only one optocoupler but mine has two.
The PSU board is labelled FM-20A02-AAA made by APD as per the image below. I am trying to find a schematic for this... -
Had one of these come in for repair with a blown battery and a WiFi issue, battery has been replaced with genuine battery (twice) and won't take a charge works fine on AC, WiFi issue gone away. Looking for a schematic so I can trace the charger circuit UM562F is only one I can find, this is the 562AI model.Had a unit come in for repair — 562AI model — with a blown battery and WiFi issue. WiFi fault has cleared, but battery won’t charge despite replacing it twice with genuine parts. Device operates fine on AC power. Suspect charger circuit fault. Only schematic I’ve found so far is for...06-26-2025, 02:41 PM -
The Schematic and BoardView( *.cad ) of MSI Z390 A-PRO , the board model no is MS-7B98 Rev1.0-1.1 ....
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