Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
Okay, take care.
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
The BIOS chip is labeled U19 and is indeed located in the corner of the board, near the coin cell battery.
The main thing with the clip is just that it attaches farther down on the chip than most people may expect if they've never used one.
The clip is attached by spreading the jaws, pushing it right up against the board, and then letting the jaws close around the sides of the chip as you hold it against the board. When properly attached, the nose of the clip should be flat up against...
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
See my [URL="https://www.badcaps.net/forum/showpost.php?p=1028699&postcount=316"]previous post[/URL] and the other posts it links to. You have to connect the programmer to the PC, install the Windows driver, connect the programmer to the chip on the motherboard, and run the programmer software.Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
See my [URL="https://www.badcaps.net/forum/showpost.php?p=1028699&postcount=316"]previous post[/URL] and
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
And you can try it out on one of the other boards you have so you don't have to worry about making mistakes. Try connecting that little clothespin-style clip to the chip so you don't have to desolder anything. Make sure the red wire goes to pin 1 on both ends.
The first step is always to press the "ID" button to detect the chip model. It will list what model it found in the text box on the left. Make sure it matches the actual chip.
Next, do some practice reads and writes....
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
Welcome back. Hope you're feeling better. Please continue from [URL="https://www.badcaps.net/forum/showpost.php?p=1028699&postcount=316"]post 316[/URL].Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
Welcome back. Hope you're feeling better. Please continue from [URL="https://www.badcaps.net/forum/showpost.php?p=1028699&postcount=316"]post 316[/URL].Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
That's great. Your firmware chip's input protection diodes will thank you.
Now, the next step is to test reading some chips.
Have you attempted to install the software for the programmer? Check the previews posts by [URL="https://www.badcaps.net/forum/showpost.php?p=1016444&postcount=284"]Stevedb[/URL] and [URL="https://www.badcaps.net/forum/showpost.php?p=1018315&postcount=300"]myself[/URL].
After you have the software working...
...
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
While heating it with the soldering iron, use something stainless steel that solder won't stick to (e.g. dental pick or screwdriver) to gently lift it. And, of course, never attempt to lift the pin with the iron itself. It may help to add some fresh solder first to aid melting. Once it's lifted up a bit, you can remove any solder bridge by using flux, desoldering braid, and or a solder sucker.
If you really must, you could even just clip it off. But you'd need to make absolutely sure you leave enough...
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
The next thing is to get it recognized by your PC. After you plug it in, it won't know how to use that device yet. You'll need to install the driver.
The Colibri software posted above contains the newest driver. You'll need to use 7-zip to extract everything before trying to run the installer. The driver you want is in a file beginning with "CH341PAR". Run the setup program is inside there.
Once the driver is installed, you can move on to checking out the software.
...
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
You solder to the pin. The pad is where the controller chip is getting 5V from, which is why we need to disconnect the pin from it entirely. After soldering it, I recommend sliding a piece of electrical tape or something underneath the pin, just so it can't accidentally touch the pad again.
So it's one wire from the tab on the regulator chip to the lifted pin, and then a second wire from the tab to the capacitor I've indicated. And that's all it needs.
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
I don't see any other cheap ones so far that are readily available in the US, have a trouble-free install process, English software, and so on. At least the CH341A is compatible with 3rd party software as mentioned by Stevedb.
The next step up is a chip programmer costing around $40-$50 (e.g. TL866ii or RT809F).
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
Well it can be modified to run at 3.3V if you want.
It already has a 3.3V regulator (the smaller chip between the big chip and the USB plug). You just need to heat and lift the controller chip's power pin (pin 28) so it isn't connected to the board, and then solder a couple short wires. One of those wires connects to the lifted pin.
The attached picture shows the easiest layout for the wires....
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
That is the black one with rounded corners I spoke of. It will almost certainly do its signaling at 5V. You can confirm this by measuring the voltage.
Do you see the yellow header with 7 pins sticking up in a row on the programmer? (The one visible in your picture.. not the similar one on the opposite side of the socket)
Just plug the programmer into a USB port and measure the voltage on the 4 left pins. Place the black probe on the metal shield of the USB plug for ground and then place...
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
After doing more research...
CH341A is actually the name of the big, 28-pin controller chip on the programmer. So, you can have many devices that are all "CH341A programmers", but they can be made by different people and have different layouts. The most common seems to be one with a black, rectangular PCB that has rounded corners on one side.
The CH341A chip itself supports either 3.3V or 5V operation, and will send signals at whichever voltage it is powered with. But, the...
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
Hmm hold on. Could you take a picture of your programmer?
I'm not super familiar with the CH341A (I have a TL866CS and an RT809F), but from what I'm reading now, most do not support 3.3V chips (which that motherboard has). However, in that scenario, it can be modified with a couple wires to work at 3.3V.
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