Can somebody explain how the power to the flash memory is controlled on a HP 450 G5? It is not directly permanently connected to 3.3V.
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Re: Spi VCC HP 450 G5
On newer platforms it's often connected to +3VSUS rail, derived from the 3V S5 rail (3VALW usually) and enabled by SLP_SUS# from the PCH.
Try to find schematics matching board model number to confirm.OpenBoardView — https://github.com/OpenBoardView/OpenBoardView -
Re: Spi VCC HP 450 G5
SPI flash VCC is mated to 3D3V_S5 rail.
What voltage do you see @ 3D3V_S5 when the laptop is ON ?Attached FilesComment
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Re: Spi VCC HP 450 G5
Is it correct that the spi flash memory is always read by the super io chip when you plug in an adapter (let's assume that there is no battery)?
This means you will always see activity on the flash spi memory on miso mosi vcc and clock. I have a hp motherboard that has 5 volt and 3.3v on the on off switch but nothing happens on the spi memory, not even vcc of the spi memory. Could be (only) a dead super io chip?Comment
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Hello everyone.
Got a catalyst 2960 from the usual scrapyard - ebay.
It is stuck in bootloop and the power supply is missing the 3.3v rail. (+12V, -53V, +3.3V)
Some green moisture crystallization on mainboard, which cleared very well with IPA and visually there is nothing rusted or gone.
Still working on the PSU to get the 3.3v rail back (waiting for parts), but for now I'm using an external buck converter board hooked up to the 12V rail ( by the way, the switch seems to be working with only 12V ).
The switch fails to boot due to the following POST error:... -
Hello, I'm stuck in troubleshooting…
The flash system works like that : when the (mechanic) flash button is pressed, the flash mecanically pop up, and a circuit buck boost elevate 7v (batt) to 200-300v (?) for charging the big capacitor. And when the photo shoot button is pressed, the capacitor is discharged in the xeon light.
In the D800, there is a first « power board » close to the battery. 2 wires (batt 7v) goes to another little « flash board ». I measured 7v, so ok.
When I press the flash button, it's detected by the system, flash icon appear on LDC display.... -
Hi there,
My mother in law gave me an Aya TV, to take a look if I could do something to repair it.
At startup, LED constantly blinks and no image is shown (even if I light the screen, broken backlight is not the problem), also +12V power rail is fine.
After some research, it seems that NOR flash often fails on this mainboard, I have found the procedure to force flash upgrading with a USB key connected to mainboard USB port, pressing "OK" button on the remote and plugging the TV power cord.
Flash upgrade didn't seem to work,... -
Hello everyone,
I'm trying to repair my old Acer Nitro 5 (AN517-54-55T5). I've already bought a new laptop, so this is more of a learning project. For the experience, with no high expectations of success.
Well, my decice specs are the following:
Model: Acer Nitro 5 AN517-54-55T5
CPU: Intel Core i5-11400H
GPU: NVIDIA GeForce GTX 1650
Motherboard: GH51G LA-L181P Rev:1c
The symptom:
When pressing the power button, the power LED lights up for about 5 seconds and then turns off. Initially, the issue was intermittent: sometimes...05-26-2025, 10:49 AM -
Hi there,
First, I'm not sure it's the right section to post for this type of device, but could not think of something better.
Ok, so my son (a mechanic) bought a faulty Hofmann Geodyna 6300 wheel balancer (which appears to be mostly a re-branded Snap-on wheel balancer).
I'm looking for any resources (doc, manuals, schematics) that would be available for this device or anyone that would have any knowledge on this particular device (or its Snap-On equivalent).
I'm trying to diagnose the fault(s ?), but I can't find any schematic (appart from the...
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