Sir, what is SPI_CLK? And What is the purpose of this signal?
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Re: What is SPI_CLK?
on what?Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....
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Excuse me while i do something dangerous
You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.
Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore
Follow the white rabbit. -
Re: What is SPI_CLK?
http://en.wikipedia.org/wiki/Serial_..._Interface_Bus
Without clock signal there will be no data transfer between master and slave.
(EC can't read bios from SPI flash).Comment
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Re: What is SPI_CLK?
What bios, EC or main? If main, maybe it will not need to be powered before power button pressed. If EC bios, then need to find why 3V ALW not present on EC.
SPI_CLK will be present only when data is moving, if EC will be read once, then after reading there does not have to be signal on SPI_CLK before power is cycled again.Comment
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Re: What is SPI_CLK?
From shematic seems only one BIOS, EC might be already preprogrammed.
Does the bios have vcc? If not then no need for SPI_CLK also.
Does the EC (U2701) have 3.3v on pin 19?Comment
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Re: What is SPI_CLK?
SPI is a 3 wire communication protocol, similar to i2c. There's a clock wire and a couple of data wires (one for input, one for output)
Basically, each time signal goes high/low (change in the state) on the clk wire, the chip makes something available on the data wire or reads what's present on the wire (one bit).
These chips can work at up to 75-100 Mhz (if you have a cheap scope you may not even detect signal on that clk pin) so it's possible the bios chip is read into memory in a second or so at boot and from that point you won't notice any signals on those pins.
Here's a datasheet for some random flash spi based chip (16 mbps, very common) :Comment
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Hi everyone, over the past few months i have taken a deep dive into motherboard diagnostics and I love the challenge. Currently im trying to learn all about the signals that travel around the motherboard, such as frequencies, enable signals High and Low logic states etc. And i have been learning to read and using the Schematics for this board that i requested here on Badcaps forum, from a few months ago, this is such a great place for these.
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Failure Symptom
No picture, just red vertical stripes. Google search shows quite common problem for these recent Vizio M series although red vertical stripe pattern may differ. Some call it "Netflix" boot screen haha.
Where is the short?
Panel has 4x buffer boards. Quickly found the 1/4 panel buffer board with the problem by selectively disconnecting buffer board flex cables.
Having recently fixed another Vizio with similar symptoms that was a shorted ESD diode array ( link ) Probed the ESD diode array but... -
Good morning.
I have posted here before and have gotten AMAZING advise (thank you!). I'm back for more. This BCaps Sub Forum is so well attended I thought I would post here.
This question is for an automotive application but has to do with what are essentially electrical questions and problem solving... If this is inappropriate I get it. Feel free to delete it or move the question.
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Hello all,
Working on my first C64 / Breadbin / 250407. Purchased as non-working. Getting black screen.
More detail below, but for those that want to get right to the question.... Here are a few waveforms comparing the Pin15 output on the VIC chip (luma/sync) to the pin 4 on the AV socket (composite signal).
https://imgur.com/gallery/PpqcqPY
My question is: Is the composite waveform range of 0.1v-1v too low for a c64?
More detail:
Symptoms are that that I get... -
Hi, guys!
I am not a professional, all I can do is solder stuff on the boards, so I would really appreciate it if someone with knowledge shares his experience/thoughts on a problem I have with a PS4 console.
My friend gave me an original fat PS4, board model SAB-001, with WLOD, that has been previously opened. I changed the HDMI port, couple of pads on the board were ripped, which I connected to the corresponding caps/resistors? Just did so as in a shown diagram (one of the ground pads I ripped off and left it not connected). However, there was still no signal, so...
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