rimist

I have a dvr with an AVTECH 760M V06A mainboard dated 2006/12/20 and a 760P V05A daughterboard dated 2006/11/15. I do not have a hdd installed. It has been working for several months. This afternoon we had a very brief power outage (light switch toggled), which reset all the connected electronics (tv, cable, dvr, etc). Everything else booted back up normally. The dvr rebooted, displaying "system init 1" and then continued to reboot every couple minutes. I have already attempted to do a hard reset, as well as remove the hdd cable (no hdd installed so why keep it in), removed the fan I had added, but there is no change. I would appreciate any help I can get.

Here are the results of the voltage checks The transformer is getting 121.8vac from the wall, and putting out 19.13vdc The hdd connector is showing 12.07vdc and 4.92vdc when connected to the main board and the front power indicator is green. The fan connector is showing 12.07vdc when connected to the main board and the front power indicator is green. The following columns are pin#, vdc when not connected to the main board, vdc when connected to the main board: p01 3.33 -1.19 p02 3.33 -1.19 p03 3.33 -1.19 p04 0.01 4.53 p05 0.01 4.53 p06 0.01 -1.20 p07 0.01 -1.20 p08 0.01 -1.20 p09 4.91 0.39 p10 4.91 0.39 p11 -0.01 -4.53 p12 -0.01 -4.53 p13 -0.01 -4.53 p14 -0.01 0.34 p15 ground

I was basing my idea of upgrading the power supply on your suggestion of the power board possibly being bad (agreed it needs to be tested to confirm this) The only thing I had connected was a fan that drew 0.08A. The two hard drives idea was for the future. I was basing the concept that the power board was barely adequate on posts (here and other places) that comment on frying the board by connecting a fan to it, and trying to find a fan with a very small draw. The system is plugged in to a surge protector that "reduces noise interference, absorbs surges, and provides common and normal mode protection from high energy spikes" No, it isn't a battery back up, but I didn't think I needed to put it on a back up until I got a hard drive installed. I am not saying that the daughter board is sub standard in general, but others have had some issue with it, and I was thinking that I just happened to get one that was having troubles (again, not confirmed). I do have to say that nothing else that I have connected that has been experiencing the same electrical conditions for a longer time (everything else is older, either months or years) has had a problem. (That I know of) From here I will test the actual voltages the daughter board is producing and post them, so perhaps we can determine if it is actually the problem or if it is something else.

scorpion - Thanks for the quick reply. I noticed somewhere else in the forum that the board puts out 3.3 / 5 / 12 v just like a pc power supply, which got me thinking... Do you happen to know the pinout spec on the connection between the mother & daughter boards? I am considering purchasing a small pc power supply and creating an adapter for the atx motherboard connector to replace the daughterboard, and would also have enough juice to run two hard drives and a system fan. I just don't see the point in spending 80 to 100 on a daughter board that is so touchy, when I can get a more powerful & stable solution for the same amount (or perhaps less)