I have two DTVPAL DVRs and one was freezing from time to time. I got to be that I could only go to the dvr menu, then the list and it would freeze up. I had to disconnect it to exit the freeze. First fix I tried was to reformat the drive. It reported no errors or bad sectors. I talked to a tech at work and mentioned the capacitors that can bulge. He suggested to check the fan first because the symptoms pointed to overheating in his opinion. Sometimes aging fans slow down and move less air from what he explained. My unit was inside a tv stand with an opened front and back.
I opened the case, checked for bulging capacitors and all looked like new without any bulging. I let it run with an open case for a while and all worked fine. I confirmed the fan was indeed working.
I removed the fan. On the fan there is a silver sticker. I removed it. It uncovered a plastic cap in the center of the motor compartment. There was some oil in there but not much. I added three drops of clear sewing machine oil. Rotated the motor by hand and noticed it appeared to move more freely. I put the cap back and re-stuck the silver sticker in the center. I then cleaned the incrusted dust off the fan blades using a dry Q-tip. (BTW, the fan was blowing inwards before I removed it)
On the case itself, I added two small section of holes where there were only fakes holes to improve hot air exit. I figured if this adversely effected air flow, I could always revert back by closing the holes from the inside of the case without modifying the esthetics of the unit.
So far I'm testing it by recording two shows simultaneously and viewing another recorded show all in HDTV. The unit is out of on top of my tv stand. With my hand, I can not feel any hot spots on the unit so far. If all is well, I'll move it back inside the tv stand in a few days.
Last edited by velix; Yesterday at 04:36 PM.