Power wont go on need assistance installing new psu
Hello I have the same problem as lots of others had with the tv not turning on. I purchased a new psu and i do not have the know how onto installing the new psu can somebody walk me through the installation.
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You only need a PSU board if the back light inverters are combined with it. Otherwise look for the inverter board. To be sure it's defective, when the picture goes off shine a flashlight on the screen to see if you can spot movement from the program on the screen. If you can see movement then the inverter board needs replacing. If you can't see any movement then the T-Con board is bad. You can get parts from here: TV Parts Universal TV Stands DLP Chips ShopJimmy
Hello Donald the first thing I would like to Know what the model number of your TV is. But that's ok if you have a external power supply you could try this .Make Shure your TV is not pug In to the Ac outlet. We are going to see if you have a short or a load on your 12v line. Ok you wont to unplug the 12v source from the power supply board. Fine out what pin is the 12v's. Connect your external power source to that pin, apply the 12v and see if it is drawing to much current. If so check the boards for any very hot items. If you have a problem on the 12v line. This will find the part that is loading it down. This is the old way of finding a load on a power source. I hope this will help some. P.S make Shure there is no AC connect to the TV as you do this test and you have the plug off of the power supply board before using the external power source.
Let's assume your post in flat panel TV's is for an LCD TV. Since your make and model is not provided, only basic info can be provided. Most LCD TV's have a stand-by power LED that is either on or comes on when the TV switches or blinks in the event of a failure. If you don't see a light when there should be one normally, then you may have a failed stand-by power supply. The stand-by power supply provides a voltage necessary to allow you to command the tv to turn on with the remote or via the power button on the tv. If the power light is normally off and normally comes on when you use the remote to turn it on but nothing happens it can still be the stand-by power supply failed. The next level of the power control is done by a small tv micro (processor) often on a board that handles audio that tells the main power supply board to turn on. To render much technical assistance you would have to know how to take voltage readings on the PSU. If there is no SB5V you either need a PSU board or there is an issue from the AC line to the PSU. It can get complicated from there depending on the failure. I assume you know the power outlet at the wall is good and the remote battery is good and you have tried the power button on the tv to eliminate a faulty remote.
Hello, Your power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
Hope this help in solving the problem,Take care.....
I have not been able to find a schmatic for this set either but was able to come up with part numbers for your power supply. The Viewsonic part number is B-00005305 but there is also a more generic number that should be located on the board that is FSP228-3F01.
Are you sure it`s the power supply?? Has the LOT (Line Output Transistor) or LOPTX (Line Output Transformer) gone short circuit or failed?? Disconnect the set from the mains, disconnect the PSU (Power Supply Unit) from the set and perform a resistance check. The easiest way to do this is to remove any (if there is one) covers off the LOT case and check the resistance from the LOT Casing (Collector) to the metal chassis / the tuner casing or any other metal chassis connection. It should read quite high in one direction due to the efficiency diodes. If the LOPTX/LOT has failed, the reading will be quite low in both directions. Note!! The aerial socket may be isolated so don`t use that as an earth. Another tell tale point is to switch on the set and listen carefully to the PSU, If it`s tweeting or a high pitched whistle, there`s more than likely to be a short on the secondary side of the PSU (Decoupling caps inside the PSU casing) or as I said earlier, the LOT/LOPTX. To test the PSU, disconnect the line output stage and connect a mains powered light bulb to the 90 - 120 volt output lead of the PSU which feeds the LOT/LOPTX. You may need to keep the other leads connected to the set because some PSU`s are turned on by the sets remote control uPC. I hope I`ve not gone too technical for you, Ian
Check the PSU/ power supply unit not the cord. The cord is never the issue in this complex problem. You may have a blown fuse in the PSU if its a IC intergrated circuit then it needs to be looked at by a qualified Tech.. We only can help you without looking at it, hope this helps