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236 Answers
Re:
You might try substituting a new fuse. Be sure the replacement has the same rating.
You may have a short in your power supply and depending on the type of supply the supply may not start up if it has overload protection.
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have you checked the DC side of TV LOOK FOR ANY CAPACITORS with holes blown in them and are a of a burnt appearance , and also look for any breaks in circuit board also look for holes in circuit solder . I know this might sound silly have you checked the fuse in the MAINS PLUG ....
Good day!Follow this D.I.Y procedures to find the exact problem of your TV.
Remove the back cover of your TV.
After that,find the power supply board.
If you already found the power supply,plug-in your TV
and power it ON.Check the input voltage of it,using multimeter (AC
range).If the power supply have no input voltage the problem could be
the power cord.Replace it.
If the power supply have the input voltage,try to test
the output voltage if have 5vdc for the system and logic supply,12vdc
for the sounds and 24vdc for the back-light inverter.Use your multimeter
tester (DC range) to test that.
If the power supply have a voltage outputs such as
5vdc,12vdc and 24vdc and the problem is still there.The problem could be
the main board.Replace it with the same type and model # because the
main board is no very difficult to fix and its very sensitive.
If the power supply have no output voltage or the voltage is too low,just ignore the step # 5 because the problem is not on the main board,its on the power supply board.
Check the following to fix the power supply board:
Fuse: Check the fuse if it is busted or blown.
Power transistor (regulator): Check the regulator if it is shorted or leak.
Resistor: Check the resistors specially the one that have a low resistance that near the power regulator.
Capacitor: Also check the capacitors if it is leak or bulging top.
NOTE: If you found any defective parts or components that mention above replace it with the same value,type and ratings.
I hope this solution will be helpful.Thank you and good luck.
When the TV is not turning ON it doesn't mean that there's a busted fuse inside although it have a possibility.There are a lot of causes to be considered.Like shorted transistors,leak capacitors open resistors and shorted diode.
Follow this D.I.Y procedures to find the exact problem of your TV.
Remove the back cover of your TV.
After that,find the power supply board.
If you already found the power supply,plug-in your TV
and power it ON.Check the input voltage of it,using multimeter (AC
range).If the power supply have no input voltage the problem could be
the power cord.Replace it.
If the power supply have the input voltage,try to test
the output voltage if have 5vdc for the system and logic supply,12vdc
for the sounds and 24vdc for the back-light inverter.Use your multimeter
tester (DC range) to test that.
If the power supply have a voltage outputs such as
5vdc,12vdc and 24vdc and the problem is still there.The problem could be
the main board.Replace it with the same type and model # because the
main board is no very difficult to fix and its very sensitive.
If the power supply have no output voltage or the voltage is too low,just ignore the step # 5 because the problem is not on the main board,its on the power supply board.
Check the following to fix the power supply board:
Fuse: Check the fuse if it is busted or blown.
Power transistor (regulator): Check the regulator if it is shorted or leak.
Resistor: Check the resistors specially the one that have a low resistance that near the power regulator.
Capacitor: Also check the capacitors if it is leak or bulging top.
NOTE: If you found any defective parts or components that mention above replace it with the same value,type and ratings.
Thank you and good luck.Please don't forget to vote and rate my answer.
Hello. If you have multimeter available you can actually check if voltage present at the end of your power cord first. If it's OK than you have to remove back cover from your TV and locate power supply board. It's very easy - it should be next to the power cord receptacle. First look for capacitors that have bulged tops instead of flat ones. If you locate any - replace them and check if it's going to take care of problem. Right next to receptacle connection is fuse located and you have to check if it's open. Replace it if needed. If new fuse got blown right away - you have short in power supply board. If fuse is OK - connect power cord and using multimeter try to figure out if 5V is supplied from Power supply board to the main board (the one that have all inputs attached to it). If 5V is present but power LED in front of the TV is still dead - you could have problem with main board. Best regards. Russ.
It is usually located near the power supply section. unplug the TV, open the back of the TV and look for a small glass cylinder with two metallic ends. This will be the fuse, now to check it do a visual inspection and you should see a clear cylinder with no internal dark smuges (good) has smudges (bad). Then if you have an ohmmeter set it to the 1xR setting and measure the fuse ends it should read 0 ohms if the fuse is good and no reading if the fuse is bad.
If you know how to use the multimeter is to get a service manual. Try http://www.servicemanuals.net Then troubleshoot the power supply and the sweep supplys. In most cases if you had to replace a complete board,unless you get it from an exchange company that repairs boards such as http://www.ptscorp.com, then it exceeds the cost of a new set. Good Luck
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