Repairman said it's the power supply, but can't find any. He said if we had the schematic's for it he may be able to use power board from another brand. Same problems turns on for split second astar pops up then black screen.sometimes sound then nothing. And of course the company is out of bussiness. HELP!!
If the problem is the power supply sometimes is not an easy fix. the easy ones are swollen electrolytic capacitors which are easy to spot because the top of it tends to swell up. However when there is a short circuit, this is another story. A blown fuse is an indication of a short. Fuses blow for two reasons, one overload or a dead short. In this supply there are two stages. In the first stage there is a bridge rectifier which is always connected to the AC line thru a fuse. Check this bridge with an ohm meter in Rx1 and make sure is not shorted.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
You are better off replacing the power supply board. Usually the mother board will output a power ok signal to turn on the TV only when the power supply is working correctly (all voltages are within specs), similar to a computer, having said so, if you have the schematics you can verify those voltages being output from the power supply upon depressing the power button. The +5v stand by voltage is most likely ok, since the mother board is at least providing you with the blinking light. It is the +12V and +24V which are not being output, along with any other auxiliary voltages. I would suggest either having a replacement board (power PCB) installed or otherwise feeding the needed voltages by substituting those missing ones with a variable DC power supply, just to verify it. Follow above only if familiar with electronics and electricity. safety first!.
U will not find schematic,the tv corporation don't release them.Just take the tv aparts.Tries Websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.Just compare the power supply board in ur tv and the website that selling the power supply board.The picture look alike,ask the seller questions.Just buy and replaced it.U know how to solders?Just searches around the power supply board for those bulges and puff up capacitors.Replaced these capacitors will get ur power back.Most just reqiure replaced these capacitors to get the power back.
Buy the green light going on means Standby is ok. Next, would be to locate the plug coming from the main board to the power supply and find the post that says PO which means power on. With your meter on that post, press the power button as see if the reading goes High, if it does then the main board is able to turn on the power supply. Next, find the plug on the power supply that goes to the inverter( the long board on the side) remove it and see if you have 24 volts coming out of the power supply when you press the power. If you do, then the inverter board is bad, if you don't have 24 v, then the power supply is bad. There are NO diagrams available for these set other than a flow chart if you can find one. A regular svc tech does'nt need a manual for these anyway.
It could be your power supply, your monitor, your graphics card or a software problem.
Try to reinstall your graphics card drivers, if that doesnt help try another monitor.
If that also doesnt help I suggest you temporarily install another graphics card. If that also doesnt fix your problem, you should go buy another power supply.