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Already replaced DC filter cap's.What else are the more common components that fail.
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Posted on Jan 02, 2017
So the old power supply doesn't have the output voltage, current and polarity noted on the label? What a ripoff! *grin* Did you look on the case near where it plugs into the monitor? Sometimes that will tell you the voltasge and polarity. Poliarity? Get that one wrong and the monitor could be cooked instantly! But it's usually positive. I found a completed eBay listing that had this info: "the power supply which the seller used to power up this Planar Flat Panel is inventoried as follows: ViewSonic 12V Power Adaptor Model # SYS1126-5012" I looked that one up, and it's listed as 12V at 4.17A. PC Hub has them for $28.62: http://www.pchub.com/uph/laptop/345-19804-2285/AC_Power_Adapter_5V-12V_Others_SYS1126-5012.html Good luck!
Posted on Jan 07, 2007
The horizontal output transitor is always connected to the primary winding of the flyback transformer (via collector) and also to the horizontal deflection coil via an electrolytic capacitor. The most likely suspect for damaging the transistor is the fylback transformer. In some countries there are electronic stores that test flyback transformer by winding a few turns on the ferrite core and applying a test voltage. This test will only test the secondary. The primary winding is difficult to test for turn to turn short because the resistance is quite low and you do not know the 'good' resistance.
Posted on May 16, 2007
Is this one of the units that has a ribbon cable ( looks alot like an IDE hard drive cable) that connects all the components together? It also has a squre plastic fan that protrudes slightly from the rear (by about a 16th of an inch)? If so, it's the power module which consists of 2 boards (along the fan housing). You can probably find replacements for about $70, but I wouldn't bother. They quit making new replacements several years ago and any board you get now is just a pull from old stck units.... and they fail about 2 minutes after you put them in. Pioneer knows this but still sells the defective parts.
Posted on Oct 13, 2007
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
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