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My first guess would be that you have a bad/poor antenna,coax, causing high reflected power, next would your power source. You will need a 25A or higher rated power supply, with clean 13.5V power to run at the higher power levels. Meter the power supply voltage when you xmt at a lower power level, maby 30w, watch for drop in voltage. If voltage drops (some) at 30w, most likely supply won't hold voltage up at your 40w and higher power levels.
I'm afraid you need a user and a service manual. These power supplies, deliver different voltages, but the also sense some or all voltages. If you leave an output without user, it could be the whole supply shuts down. Some knowledge of electronics is a must.
The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.
The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.
All these can be checked on the power supply board.
But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.
The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)
You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.
What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).
You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.
Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.
If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.
I hope this helps.
That problem is 2 causes,its either power supply or system board. This are some D.I.Y procedure for troubleshooting.
Open the back cover by removing all screws at the back.
Try to look at the power supply board and find the leak/bulge on top capacitors.If you found,replace it with the same type and ratings.
If the power supply doesn't have any leak capacitors.Try to power it ON to perform voltage checking.
Check the output voltage of power supply such as
5vdc,12vdc and 24vdc by using voltmeter.If this 3 supplies having a
voltage drop or flickering voltage while on power ON.Check the following
parts on the power supply,change value/open resistor,shorted transistor
and diode or repeat step # 2.
When the output voltage is stable and all parts looks
OK.The problem could be on system board.Unfortunately the system board
or main board is not for D.I.Y because the parts inside is very logic
and very sensitive.That is replaceable.
Magnavox has issues with puffed caps on the power supply. This sounds like its a 32 inch lcd tv. I tried searching for a service manual for this and can't find one. If it is an lcd you need to look at the capacitors on the power supply. If they are puffed up, you will need to replace them with equal or slightly larger valued capacitors. The capacitor values are mfd and voltage printed on the capacitors themselves. You will need a soldering iron to replace them. Lay the tv, if it is an lcd, on a flat surface cushioned by a blanket. Make sure the surface is large enough to support the tv frame, as you don't want to cause damage to the panel. remove the back of the tv. There are numerous screws, and once the back is off, check the power supply pcb for puffed caps. This is the board with the power cord attached. I know in magnavox tv there is a cage covering the power supply, so remove any connectors because you will have to flip the cage housing the power supply to get to the caps. If you feel confident, give it a try. Let me know how it goes
A user manual will do you no good for a tv that has lost its picture. You will need a service manual. Your tv sounds like it's a 37 inch lcd or plasma tv. The cause could possibly be puffed capacitors on the power supply. If you feel confident, you could check the power supply pcb and visually look at all the caps on it to see if they are puffed.
To do this you need to lay the tv face down on a cushioned surface large enough to support the tv by the frame. This is to prevent any damage to the panel. Then remove all the screws securing the back of the tv to the frame. Look at the power supply pcb, it is the board with the power cord attached to it, for puffy caps. If they are puffed they need to be replaced. Replace with capacitors of equal or slightly greater values. The values are marked on the caps themselves in mfd and voltage.
If they look good, take a multimeter and test the dc voltage outputs, usually marked on the power supply near connectors with different colored wires. There should be three of them together. Take the black lead of your multimeter and connect it to chassis ground, and the red lead use to check the voltages.
There may be multiple fuse boxs in your car, you need to make sure to check all of them listed in your owners manual. Checking involves a voltmeter and not just checking the 2 fuses you think supply power to the radio, there may be multiple fuses that supply the necessary power to the radio. Yellow and red at Kenwood need to see 12 volt positive with the key on and the black needs to have ground in order to turn on. If all three have correct voltage then pull the harness from kenwood and check small 10 (red) or 15 (blue) fuse held in and protected by the harness. Good luck!
tblackwood ...if you have connected your remote turn on for your amp to the remote turn on on the deck(this is also the power aerial connection) ..on some decks this has power only when the radio is operating. as soon as you insert cd it shuts down the power to this supply(i dont know why some did this.it was a bad move ) ..you may have to find another power supply to turn the amp on (accessories supply on the ignition..)