Sharp tv will not start after power surge ( no power indicator light),
How do I test the power suppy board,main board, etc for replacement?
I have a digital multimeter to check outputs. Is there a most likely component or circuit breaker that goes first?
Thanks for any help or recommended repair service contacts.
Testimonial: "Example pictures quite helpful. I do some more visual checks and then post pictures of my power supply and ask for test locations. Thanks"
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To test the back lights, you need to disconnect the cable between the main power supply & the main board, apply the AC power to the power supply, if the back lights are not light up, or blinks, the back light are defective.
Fault to the main power supply regulator section. Either it will be on a separate board, or on the part of its main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
if you had a surge, it could have damaged more than just the power supply. When you plug in the unit, does the power indicator light up??? your main board could also have damage. The main board sends a signal to wake up the power supply thus turning on the TV. If you have to replace the main board as well, it probably won' t be economical to repair the set.
What is ur tv problem?No tv power LED light incation all or power LED light indication an OPC LED lights indication flashing togethers?Tries tv unplug,replug it back like about an hour later,for the tv to do a whole resetting.Tv might work again.Tv still have no pwer all?Yes.The tv power supply board it is dead,that the board where the power a/c cord plug into it.If the tv have both power LED and OPC LEDS lights blinks together.The tv main board Tuner signal board it is the cause and the problems it is dead.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board or a main Tuner signal board for the replacement.
90% to 95% ur tv have a dead power supply board only.5% ur tv could have both dead boards the tv power supply board and the main tv Tuner signal board too.The tv power supply board.That the board,where the power a/c cord plug into it.The tv main Tuner signal board,that the board where all the exstented devices and the tv incomming broadcasting signal cable wire plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement first.The tv problems should be fixed.If not than the main tv Tuner signal board is dead too.Must be replaced also.
It can be as simple as a blown fuse in the main power supply module, if you get not indicator light at all, then it will be the power supply has gone out, if you do get some indicator light, the 5v standby power supply is still functioning but not the main section of the power supply module. The filter capacitors look good, no bulging tops?
Any indicator light on at all, if you see the light, then only the 5v standby power supply is working but not the main section of the power supply, it can also be the main control board hat is not sending signal to turn on the main power supply section.