hey all. Its been awhile since I've been on here a lot has happened in life over the last couple months. change of life my father passed away and a lot of other things family oriented. I'm getting back into it again but I have been fixing tvs on the side with not much researching on the internet.
I got this TV that came to me last night you can clearly see that the tvs working if you shine flashlight into the screen. however there's no back lights. I traced it down to a shorted mosfet that powers one of the ballast transformers on the power supply. I replaced the MOSFET. I suddenly had back light upon power up but they were flickering.
after about 3 seconds the backlight will go out and you could still see the image in the background. I've done voltage test from the main board and is still supplying the power on signal. however I cannot seem to figure out what's going on. I can tell you that there's too much that's it run each ballast transformer. One stays at about 300 bolts and the one that I replaced comes up to 300 volts and then starts dropping off. This is measured off of the drain of the MOSFET. any idea as to why besides my thinking. T backlight controller I see on the power supply may be bad? The controller IC is a oz9oz99-8gC. Mosfet location Q802
as of now the state that it sets is no back like to punch power up at all anymore but the MOSFET is no longer shorted. anyone had any experience with this power supply?
Power supply (T)9QG2LAAW or 715G3829-P03-W30-003S
I got this TV that came to me last night you can clearly see that the tvs working if you shine flashlight into the screen. however there's no back lights. I traced it down to a shorted mosfet that powers one of the ballast transformers on the power supply. I replaced the MOSFET. I suddenly had back light upon power up but they were flickering.
after about 3 seconds the backlight will go out and you could still see the image in the background. I've done voltage test from the main board and is still supplying the power on signal. however I cannot seem to figure out what's going on. I can tell you that there's too much that's it run each ballast transformer. One stays at about 300 bolts and the one that I replaced comes up to 300 volts and then starts dropping off. This is measured off of the drain of the MOSFET. any idea as to why besides my thinking. T backlight controller I see on the power supply may be bad? The controller IC is a oz9oz99-8gC. Mosfet location Q802
as of now the state that it sets is no back like to punch power up at all anymore but the MOSFET is no longer shorted. anyone had any experience with this power supply?
Power supply (T)9QG2LAAW or 715G3829-P03-W30-003S
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