Hello AVS. Been coming here for years to keep my three 5504's up and running. Until now, most of my issues have been fixed by replacing the hard drives. However, one of my units (still rockin the original hard drive from 2003) is having some erratic behavior.
It first started with a fan lock detected message and then no signal detected. A reboot here and there would restore functionality. A few weeks later, the reboots did not change the condition so I decided to replace the hard drive with another original Maxtor drive (from another unit that I had pulled for a bigger hard drive years ago). This extra drive has been a good test drive for the other units so I am pretty sure it works. Well the new hard drive helped the unit run properly for a day, but then the same problems returned with some new symptoms.
Here is what happens in order with either the original or replacement drive installed. Video input is via basic coax cable and video out is via composite RCA to TV.
Plugging in unit - hard drive will spin, no fan spin. Nothing on screen, not even 'please wait'.
Next, I hold down power button for 20 seconds to reboot - after doing this one or more times I will finally get video output of 'please wait'. Sometimes the video output at this point is distorted as if the plug is not inserted all the way. The plug and TV are fine. Another reboot or two usually fixes this.
Once I get clear output of 'please wait', then the unit finally boots up and the fan runs as normal. At this point, I may or may not be able to tune in a channel. If I can, it only lasts for a second or two. If I let the unit run a while, the fan might stop but not always with the fan lock detected message.
Even when the unit cannot tune a channel, I can still view (with no issues) recordings on that hard drive (recorded on the day it worked). I can also view these recordings across my network on other replay units. And I can view recordings from other units across the network with no issue. This makes me think the hard drive is fine.
At this point I am suspecting it is the power supply. It is interesting how it takes a long time and many reboots to get started – maybe it needs to warm up. But it also could be the motherboard. I have read mikeyboys recommendations for testing the power supply. I have tightened all the screws and inspected the power supply for busted caps and burnt pins on the cable to the motherboard but found none. My voltage tester probes are too big to fit inside the plastic housing to check the voltages so I can’t do a complete test. So I need some advice on where to look next.
I suppose at this point I need to find a unit for sale to use for parts or a replacement unit to put my hard drive in. Any thoughts?