Recent content by texpo

I soldered a tactile push button to K1 and shorted it for 30 seconds after power apply power and no beep.

I checked the battery (soldered) and it's reading 3V.

I will have to check that when I get off work. Thank you.

It does not boot w/o a drive and I tried using a different 12V, 2A power adapter as well. It powers on with a solid red light on LED4 and no POST beeps from the mini speaker.

Last night I had only the white wire (Rx) connected to pin 2 (3.3V) and nothing else connected, not even GND and when I power on and off the DVR, PuTTY would start filling rows of blocks. So not sure if that is normal and it stops when I turn off the DVR which means pin 2 must be the (Tx) on the...

@alastairstevenson Okay, so I concluded that the USB-TTL PL2303TA cable is working with a loopback test (connecting a piece of wire between RxD and TxD) in PuTTY 0.78, Termite 3.4, or MobaXterm 22.0 via local echo. So I guess this DVR is a goner unless there is anything else I could try?

I bought the USB-TTL PL2303TA cable today, connected the black wire (GND) to pin 3 (GND) and the white wire (RX) to either pin 1 (2.4V > 2.6V) or pin 2 (constant 3.3V), power up the DVR and PuTTY just sits at a black screen. Windows 10 recognizes the cable and assigns it COM3. The comm port was...

Hello, I have a Dahua OEM DVR that won't boot or display anything on the monitor (black screen). I see a red light on the main board where it marked LED4, so I suspect something is wrong with the firmware or programming. I read somewhere that I may have a chance to revive it with RS232, but I...