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If you're sure that your power supply is okay and the switch is okay, but the computer won't switch on, the problem is most likely somewhere on the motherboard. What happens when you turn the computer on? Do any lights come on? Do the fans come on? Is there anything displayed on the monitor?
If you have access to another computer, try installing your power supply in that computer to make sure the problem does not lie with the power supply itself.
The problem lies in the reduction of operational frequency. It is mainly caused during the loose of ferrite cores or failure of HV diodes across the primary coil. 1) Check the looseness of ferritte cores parts loose or fixed properly ? 2) If OK Just check the components parallel to the high voltage side of the big transformer. 3) Check low voltage schottky rectifier diodes. One must be shorted. Just remove and here the sound. If it disappears, it must be faulty. During this test, the output voltages may increase to three times also. So, to safeguard, disconnect the filter capacitors. Solution : 1) If any of the core becomes loose, just join it properly with epoxy or glue. 2 & 3) If any device fault occurs, just replace it in case of schottky rectifier diodes better replace with higher capacity. Capacity with numbers are given below : 1N5822 => 3 A F12C20=> 6A per channel total 12A MBR 20150 => 10A per channel. MBR 3035WT => 15A per channel
Polariod TV's are far the most worse in the market right now for qaulity. But the issue is a faulty capacitor on the power suplly logic board. The fix Replace all capacitors that are followed by the one that is bad. If you do not know about eletronics repair this would cost you $150 $200 for the repair depending on the issue as a whole.
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I believe sometime when you insert the AC Adaptor while the power switch still on in CAM mode or VTR mode the sparking cause the micro fuse protection blew up it require a qualifier and trained from Sony to repair it
I had this service manual how do I post to you it big about 15MB
I sugges to bring it to Sony for repair it sometime they can not repair at component level they replace a complet PCB and it need the computer to setup and adjust and highly cost
I hope that give you some ideas
More then likely it is the video board. Let me explain why. If the entire power supply was bad you would have what is called a "dead set" meaning no picture and no sound. Now in the likelihood that just the section of the power supply that supplied power to the video board was bad, now that might be the case, however unlikely as it is. Now the best way to see if this is the case would be to measure the DC voltages of the power supply to determine if that is the case. For this task you will need a voltage meter and a schematic of the TV. If you have a background in electronics this would be a snap, if you do not have a background in electronics, I would suggest that you take the Tv to a qualified TV repair shop so that the repairs can be done.
If it is just the video board you will need to follow the replacement instructions exactly as the schematic will show you.
You can usually order the board from the manufacture or one of their customer support shops. Go to the manufacture's web site and look under customer support or repairs.
need fans on main cpu maby died replace with ball bearing blow all the dust out of it with big vac on blow ok and go nuts blowing dust out add hiend nice quilty fans mascool on newegg 10 pack 12 bucks free ship cheap nice need air flow getting to hot and power suplly cant keep up get nice dual rail one ok
Hi, all power supply's have a fuse in them, remove the power supply, open it up and study the printed circut board, you will see either a white ceramic or glass fuse attached to it. Replace this and reasemble it then re-install it into your computer and then test it. If you still have no power then you will have to replace the unit as the costs of repair are far greater than a new one.