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Chat Discussion, DM500s No power at DreamBox forum; Hi, I switched on the box from the mains, green LED comes on, but fades after a couple of seconds ...

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spitfiremk5
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DM500s No power - 09-June-2010, 23:38

Hi, I switched on the box from the mains, green LED comes on, but fades after a couple of seconds and eventually dims out. If it switch off and on again (with a short delay in between), LED stays off. If i switch on after 15 mins, green LED is on and the same happens again. Any ideas ?
   
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stan_mt
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10-June-2010, 02:56

try and disconnect everything maybe you have a short.....otherwise your mainboard is kaput...if you know how to check, check 5v and 3.3v output from internal SMPS psu
   
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10-June-2010, 20:05

Maybe you have to try another power cable..is the box original or clone?A lot of clone 500s have problem with power supply


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10-June-2010, 20:28

Quote:
Originally Posted by spitfiremk5 View Post
Hi, I switched on the box from the mains, green LED comes on, but fades after a couple of seconds and eventually dims out. If it switch off and on again (with a short delay in between), LED stays off. If i switch on after 15 mins, green LED is on and the same happens again. Any ideas ?
i had same symptoms with a power supply ( does it do the same without plugging into receiver?)
i ended up opening it up :
found that it had been soldered on top of pcb and 1 had a little short
repaired that checked onboard fuse with multi meter fuse had gone bypassed that tested all good tapped back up still running strong..
hope this helps
foz


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Last edited by foz; 10-June-2010 at 20:31..
   
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10-June-2010, 22:45

Thanks for the feedback; After numerous attempts, the box was OK !! Why - no idea !! The output of the power supply is OK at 12 volts, but without load. Any idea where i can get a picture / circuit diagram to check these on the motherboard.
   
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10-June-2010, 23:15

Quote:
Originally Posted by spitfiremk5 View Post
Thanks for the feedback; After numerous attempts, the box was OK !! Why - no idea !! The output of the power supply is OK at 12 volts, but without load. Any idea where i can get a picture / circuit diagram to check these on the motherboard.
ha sorry just read your post again my green light came on then faded away but never came on again
open it up there not alot inside if i remember correctly its only single sided board with big heat sink + components
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11-June-2010, 02:15

plug in the psu and check if you have 12v across the diode behind the power socket

if not check your psu...otherwise it's a m/b fault
   
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