toshiba 52xv545u no back light

[robert phelps]

i have this tv that i can see the menu on the screen but no backlight it has a master and a slave inverter boards i have 5 volts 12 volts and 24 volts were stayed on pc boards inverters have 24 volts on the pins that should be.. dont know if maybe the master inverter isnt working or if the logic board isnt turning on the power supply tv also has sub power supply logic board has connectors from main power and sub dont understand what logic is doing

[johnboy1313]

Re: toshiba 52xv545u no back light

Check for small surface mount fuses right next to the connectors on the inverters. One or more may be blown.

[budm]

Re: toshiba 52xv545u no back light

We need pictures.
Beside checking the fuse, you need to find out if the inverter is getting the command signals or not.

[robert phelps]

Re: toshiba 52xv545u no back light

How do I find out if the inverters are getting the signal to tournament on

[budm]

Re: toshiba 52xv545u no back light

How do I find out if the inverters are getting the signal to tournament on

Where are the pictures I request?
I do not have the TV in front of me to look to see what boards are being used and how they are hooked up together and what the labels are for the pins of the connectors, etc.

[robert phelps]

Re: toshiba 52xv545u no back light

Sorry been at work all day just got home will post pic

[robert phelps]

Re: toshiba 52xv545u no back light

Here are some pictures of set

[ReeceyBurger123]

Re: toshiba 52xv545u no back light

Are the inverter fuses good ? Do you have back light on signal ? You should provide us with this information plenty on this site showing how to test this. I feel like a broken record on here some days constantly repeating stuff that takes 5 seconds to search up.

[robert phelps]

Re: toshiba 52xv545u no back light

I have 24 volts on small fuses on inverter boards except one on the master good on one side nothing out the other

[ReeceyBurger123]

Re: toshiba 52xv545u no back light

Good, right theres a fault on the master inverter then. You can either replace it or we can help you diagnose it ?

[robert phelps]

Re: toshiba 52xv545u no back light

What if I bypass the fuse with a wire and see what burns up

[johnboy1313]

Re: toshiba 52xv545u no back light

Sometimes, it's only the fuse. Do you have a digital multi meter? You can check the current draw when powered on by setting the meter to DC Amps and putting a probe on each end of the bad fuse. If it's only the fuse, the set should power on. If it's not only the fuse, you might blow the fuse in your meter or blow something else on the board.

[budm]

Re: toshiba 52xv545u no back light

I would get the spec sheet of those power MOSFETs used on the inverter board to get the pin out so you can check the resistance between Spin and the D pin to verify.

[robert phelps]

Re: toshiba 52xv545u no back light

Well I tried the voltage meter across fuse. Sounded like power supply came on and then smoke from inverter board. Found master and slave on ebay. Hope didn't do any other damaged. Plus only had 3.2 volts for inverters. But after unplugging and plug-in back in had 23.8 volts on inverter pins on psu

[robert phelps]

Re: toshiba 52xv545u no back light

New boards did the trick. Works great now. Thanks everyone

[vinceroger69]

Re: toshiba 52xv545u no back light

Thanks for the update glad your tvs now working.