Question about Pbi HD3150 DTV Receiver
On power up, red LED comes on in front display. Pressing on/off switch changes to green LED in display. Opened unit and power supply provides marked voltages to main board. No output to TV.
Disclaimer: The answer provided is entended for you to have some basic electronic knowledge and soldering skills.
Troubleshooting switching power supplies just sucks, but there are ways of finding the fautly componets. In my case, a visual inspection found 2 bad capitors, the tops bulging open and oosing goo. If you look at the tops of any other caps they should be flat. You can also note faulty caps by discoloration of the circiut board itself. I had one other faulty cap on my supply that, by visual inspection had been running hot. After replacing the defective caps (Nichicon 105c) I went with an ohm meter, and checked the smaller transistors for faults. Q1 a very common transistor was bad (2N3906) with a base emitter short. In conclusion, it's the cheap caps that are at fault, sometimes taking the silicon with them as they short out. The unit is now working.
As an added note, I understand that there is a Radio Shack branded version of the HD3150 as well.
Posted on Jun 12, 2010
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Posted on Jan 02, 2017
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