This Dahua NVR doesnt boot. Makes a red blinking led beep constantly and this chip is getting 60C. I holded my finger on top and I got burn. What can I do?
To be honest I personally don't like things I see. However I am not sure really what it is I am seeing.. So what chip is getting hot? U130 8 pin chip or U7013 the 84pin QFN/TQFP? in the first picture what is the big shinning thing in the picture looks like some twisted metal or you using that to show the 8 pin chip? U105?
So is that your personal device or is that one you bought used in not working condition? Reason I am asking is there are some areas on the PCB that shows signs of soldering either adding in or taking out parts or maybe they used the area to inject voltage for troubleshooting but need to know what history the PCB has to know better about what is going on in the pictures you posted?
With a chip getting hot this is normally a sign of a short so would need to test the parts around the chip to see if there is something that has died. Diode,cap,resistor that is no longer working as one but a wire, Then kind of need to know what chip is getting hot. If it is the large package and that chip is dead, if you don't have the soldering hardware and skills to replace that chip if it can even be found open market and don't require programming.. If you cant replace it then ewaste the NVR and buy a new one.. There are so many out there for a cheap enough price not sure why waste the time? I mean phones and laptop repair for current hardware is one thing. The cost of few hundred dollar repair bill to having to pay 8 to 1500+ for a replacement is understandable.. Most times it is repair for data recovery and pictures that are not backed up can be priceless..
But a NVR what is the value of repair. For me if it was on my bench for repair, I would test all items leading to the hot device and if there was no clear shorted part on the PCB and can't find a datasheet for the chip in question then not sure the cost of the rabbit hole would be worth it..
So is that your personal device or is that one you bought used in not working condition? Reason I am asking is there are some areas on the PCB that shows signs of soldering either adding in or taking out parts or maybe they used the area to inject voltage for troubleshooting but need to know what history the PCB has to know better about what is going on in the pictures you posted?
With a chip getting hot this is normally a sign of a short so would need to test the parts around the chip to see if there is something that has died. Diode,cap,resistor that is no longer working as one but a wire, Then kind of need to know what chip is getting hot. If it is the large package and that chip is dead, if you don't have the soldering hardware and skills to replace that chip if it can even be found open market and don't require programming.. If you cant replace it then ewaste the NVR and buy a new one.. There are so many out there for a cheap enough price not sure why waste the time? I mean phones and laptop repair for current hardware is one thing. The cost of few hundred dollar repair bill to having to pay 8 to 1500+ for a replacement is understandable.. Most times it is repair for data recovery and pictures that are not backed up can be priceless..
But a NVR what is the value of repair. For me if it was on my bench for repair, I would test all items leading to the hot device and if there was no clear shorted part on the PCB and can't find a datasheet for the chip in question then not sure the cost of the rabbit hole would be worth it..
Is that mangled, shiny metal in the first (left) image what remains of the battery holder for the lithium coin cell that supports the RTC (real time clock) ?
Or is it OK and the top view is distorted, making it look mangled?
Or is it OK and the top view is distorted, making it look mangled?
I soldered the a button to the 4 reset pins. Just that. For the password reset and it worked, after that removed the button and still working. Thats the only thing that has been soldered. The hot chip is the 84pin one. I just stopped using the dvr for 1 month and when i pluged in a month after this is what i see.
Flintstone61
Known around here
Yeah if the 84pin chip is the one getting hot, If there are markings on it what is the Chip you might be able to find the Data sheet and track down what is causing it to get hot. However if it is the chip and requires programming then as said before time for a new one.. However if it can be found on datasheet and can find a dead shorted item that is removed and or replaced and that cures the fault you are good to go.. However if the fault is really in the chip it self and you don't have the ability with quality rework station plus if the pictures was showing the bottom of the chip it looks like it has a center ground plain that is going to be deeply soldered to the board. Why I said quality rework station one of the cheep ones my guess is you will just burn up the board. Again might as well just replace the NVR for a newer better one.. My guess is that your reset might have caused some damage that shorted out something. Most times when there is no reset button there is some other parts of the puzzle missing as well. Like on most of the lite Dahua NVRs that don't have a reset switch but empty space on the board c39 is also always missing so even with adding in a switch in that NVR it wouldn't' reset the thing because part of the circuit is missing. In your case with it resetting as you said. There might have been something in the circuit that would have shunted any issues when you let go of the button or what ever it was that you reset it with.. Kind of like a Shock absorber however without fried the chip.. For all I know that was why they removed it because doing a factory reset in the quality testing killed the device?
Flintstone61
Known around here
Because when you forget the admin/ login pass, or buy and sell stolen merch....you have to try something to get past a login screen.
You could be right....even when that battery has nothing to do with storing passwords.
tibimakai
Known around here
I would use IPA when turned on and see if any other part may be shorted near that IC. Maybe it is a shorted smd capacitor. The IPA would dry up first at that component.