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I have a black screen and sound but no picture. hisense 32k20dw

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hisense 32k20dw is the model of my tv. yesterday i turned it on it blinked 6 times and i got no picture. from what i read online its more than likely a blown capacitor. i also noticed theres a hissing noise coming from the power supplys pcb board i feel like thats the problem because i checked and i dont see anything fried on the other board but im still a newbie when it comes to things like this so id greatly appreciate some help. the board of intrest im looking at is a RSAG7.820.5338/ROH. i cant isolate the hissing noise it sounds almost like its in between the main board and the power supply. also the hissing noise is greater when the tv is off.

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@domfran the caps on your boards look good. Of course the only way to test them would be with a capacitance meter etc. but this could be a backlight issue. Shine a flashlight beam (in a darkened room, TV on and a channel that has sound) at an angle against the display. See if you can make out any silhouettes etc. If so it is your backlight that is not working. That could be related to a bad power board or a bad LED backlight strip. Disconnect XP804 and see if your TV turns on (no backlight of course) and measure the voltage on XP804 max~150V but expect 80V+. After that check the voltage across the pins on C717. Measure the voltage on the fuse on your T-con board as well. Expect 12V on that. Let us know what you find

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Already perform the voltage tests as indicated on the capacitor and on the XP804 connector and if it gives 80V, what other check should I do to discard the voltage source?

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@Edgar Alejandro gonzalez same make and model same issue?

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@oldturkey03 Yes, it is the same brand and model.

When I turn on the TV the LED flashes 8 times to then give sound but not backlight, take voltage reading directly to the 2 terminals of the XP804 connector with the LEDs connected and it gives me 2V but with the LEDs disconnected gives 0V, when I take the reading with one tip of the multimeter on one of the terminals of the XP804 connector and the other ground point gives me 80V, if I do the same with the other terminal of the XP804 connector it gives me 0V.

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My Hisense tv has sound no pic and can't figure out TY

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@karen veenstra what is the exact model? What have you checked?

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hello Dom Fakelastname, my name is John. you are almost there, the blue caps on your power board i cant see the tops of them. but if they are push out or split open then that is your issue. or you can replace the board folloing these steps below.

best steps to follow,

1: lay t.v. screen down on a soft surface like your bed.

2: remove the screws from the back edge and input connectors as well as the stand.

note: back should lift off every easy if you have a struggle there is another screw to be removed.

3: take pictures of the power board it would be the board that the plug goes into.

note: leave wires in power board until replacement board comes.

4: google search your make and model T.V. of a replacement power board. reference images with the ones you took.

5: it will be 4 to 5 screws to remove power board and squeeze connectors for the wires.

6: after replacing board lift t.v., plug in, test, and put back together.

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see thats my problem i dont see any expanded caps or black circuit points all i got to go off of is the hissing noise

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I have the same tv and my screen just went black without warning and won’t come back on. The sound still works and I can change channels, just no picture. I do not have a hissing noise with mine. I am unable to pull up the settings, input, or guide because I can’t see anything.

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Dom Fakelastname さん、ありがとうございました!
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