RoyalFlush
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- 12
- Joined
- Mar 18, 2018
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Hi
I have a Uno 4k that is 'not working'. Symptoms as follows:
(1) Power light comes on
(2) No HDMI output
(3) Power light flashes when buttons on remote are pressed
(4) Does not update when USB stick is inserted with new image (power light stays on and does not start blinking)
I have opened the unit and checked the regulators as I know that these have been an issue on earlier hardware models. I measured the following voltages from the various regulators with a multimeter which seem to be ok for the BROADCOM BCM7252s CPU:
0.9V - U134
1.5V - U103
1.8V - U104 (maybe this should be 2.5V??? but unless I have a datasheet or schematic for anouther receiver I dont know how to verify this)
3.3V - U106
5V - U105
I could not find a datasheet for the BCM7252s but found details on a receiver using the same chip ( page 38) showing that voltages of 0.9V @10A, 1.5V @3A, 2.5V @4A, 3.3V @4A and 5V@3A are required (design specific but the voltages should be the same for the Uno 4k and current requirements would be a relative indicator).
There are no electrolytic caps inside this unit which I know can be problematic.
I will proceed as follows (and this should preferably have been done before opening the unit but I dont have the cables/parts at hand yet):
(1) check RS232 output from the receiver on the PC
(2) check for composite video output
(3) try to update the flash again with a different USB stick
Can anyone tell me what the pinout is for the composite video output (3.5mm microphone jack with 4 pins) connector?
The Uno 4k is a relatively new model so I doubt many have had issues with the hardware. However, I will keep on updating and hopefully anyone experiencing issues in future will be able to refer back to this.
Please feel free to suggest any debugging steps that you think might be useful.
I have a Uno 4k that is 'not working'. Symptoms as follows:
(1) Power light comes on
(2) No HDMI output
(3) Power light flashes when buttons on remote are pressed
(4) Does not update when USB stick is inserted with new image (power light stays on and does not start blinking)
I have opened the unit and checked the regulators as I know that these have been an issue on earlier hardware models. I measured the following voltages from the various regulators with a multimeter which seem to be ok for the BROADCOM BCM7252s CPU:
0.9V - U134
1.5V - U103
1.8V - U104 (maybe this should be 2.5V??? but unless I have a datasheet or schematic for anouther receiver I dont know how to verify this)
3.3V - U106
5V - U105
I could not find a datasheet for the BCM7252s but found details on a receiver using the same chip ( page 38) showing that voltages of 0.9V @10A, 1.5V @3A, 2.5V @4A, 3.3V @4A and 5V@3A are required (design specific but the voltages should be the same for the Uno 4k and current requirements would be a relative indicator).
There are no electrolytic caps inside this unit which I know can be problematic.
I will proceed as follows (and this should preferably have been done before opening the unit but I dont have the cables/parts at hand yet):
(1) check RS232 output from the receiver on the PC
(2) check for composite video output
(3) try to update the flash again with a different USB stick
Can anyone tell me what the pinout is for the composite video output (3.5mm microphone jack with 4 pins) connector?
The Uno 4k is a relatively new model so I doubt many have had issues with the hardware. However, I will keep on updating and hopefully anyone experiencing issues in future will be able to refer back to this.
Please feel free to suggest any debugging steps that you think might be useful.