dvrtiger 0 Posted September 2, 2010 Recently I've got a truck load of AVC 773/776/777 DVRs in our service shop with the same symptoms: time/date issues and recording issues. The origin of this issues was tracked to back up capacitor, marked BT1 on PCB, which has the same purpose as a normal button cell battery on most DVRs. It is a 0.22uF/5.5V capacitor which you have to replace because it degrades it's capacitance by age. Also, you have to raplace two nearby crystal oscillators, marked X2 (22.1186kHz) near master microcontroller and X3 (32.768kHz) which are affected by degraded capacitor and it's leaking current. I hope this will help to someone. Share this post Link to post Share on other sites
scorpion 0 Posted September 8, 2010 Is there a particular year that has the cap problem? Share this post Link to post Share on other sites
dvrtiger 0 Posted September 10, 2010 No, I didn't notice that it's an issue related with some particular year of manufacture...to me, it is just a normal problem caused by a capacitor on such a critical position, which doesn't allow much of a tolerance, after some time. Share this post Link to post Share on other sites
justone 0 Posted July 23, 2011 Hi I'm having the same problem with three avc782zc dvr units that i have. Are those components suitable for and would replacing these components fix these units? Share this post Link to post Share on other sites
dvrtiger 0 Posted July 26, 2011 Well, you have to look around clock oscillator and figure out if there is backup capacitor or battery, because I don't have knowledge about PCB setup on your models. But as I know, most AVC DVRs use the same crystals so the only difference would be between capacitor and battery. Share this post Link to post Share on other sites
justone 0 Posted August 11, 2011 thanks dvrtiger, i will open up the boxs when i get back from hols and let you know what i find. Share this post Link to post Share on other sites
justone 0 Posted September 4, 2011 Hi dvrtiger. I just gor back from a break away. The AV-782M dvrs i have do have a MS621 Surface Mount MS621FE Rechargeable Backup Battery located on the other side of the motherboard. I've never seen this on any electronics board before. Can i simply replace this battery? could i even replace it with a standard CR2032 Rechargeable Backup Battery (found in most computer motherboards) which i have loads of laying around? http://www.smallbattery.company.org.uk/sbc_cr2032-wr.htm Share this post Link to post Share on other sites
