Question about Cameras
Lnb input should have voltage which provide the power supply for outdoor lnb, right now the voltage is zero, what component may be bad ?
Posted by Anonymous on
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Posted on Jan 02, 2017
Check inside the receiver for a defective LM317 IC or a TIP42C transistor, but before that you should check for proper voltage from the power supply to that IC.
LM317/TIP42C control the switching of voltages that power up the LNB, you should be getting 14 volts for vertical channels and 18 volts for horizontal.
Posted on Mar 08, 2008
SOURCE: no output from power supply
I am assuming that you are very familiar with electronic circuitry and components, use of a DVM and a soldering iron. In the absence of a schematic diagram, and since you have perform initial voltage checks, perhaps you can wing it. Your "brick" will have to follow the basic design of an SMPS (switch mode power supply). Simply stated,an SMPS is an AC to DC to high freq AC then to lo V DC converter. Per your post, you have checked that there is DC (B+) from the AC mains, then what is needed is to check if there is oscillation to produce the high freq AC. Often design calls for an optical coupler, a small rectangular looking component with four pins, two at each end. This is nothing more than a LED and a Light Dependent transistor. Its function is to switch/trigger on the oscillation (and therefore start the SMPS producing the lo B+s).
Again, since there is no readily available schematic diagram, might I suggest that you post back the part numbers of the ICs and transistors. What we can do is pull out their spec/data sheets and/or application diagrams. Such would give us a general idea of the working voltages at what pins and what each component is supposed to do. Example, let us say your power supply uses a 817A/0635 opti coupler and/or an SG5841DZ controller IC, then we can search for them as initially described.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.
Posted on Sep 30, 2008
Polaroid will not release component schematics not even to service centers as they are designed to replace the entire modules while under warranty out of warranty there is very little Chance of obtaining new replacement parts. As i have a 2006 LCD and a 2007 Plasma Polaroids and polaroid told me they are considered a disposable TV replacement parts are not available and suggested that I try ebay
Posted on Apr 29, 2009
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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