Samsung Odyssey G9 (c49g95tssr) no picture or backlight. Power LED shows

[lotas]

Here it's not clear where A comes from
low resistance between ground if mosfets 2 pcs. and 2 capacitors do not have a short one and this section no longer goes anywhere?

[lotas]

I forgot to ask, did you ever measure the resistance at these points, did you de-energize the board or was it energized?

[grimreaper420]

I forgot to ask, did you ever measure the resistance at these points, did you de-energize the board or was it energized?

i found a short in capacitor (circled), its not close to the fuses though. I dont have thermal camera or lab power supply.

when i measured resistance the board was unplugged. i only tested the voltage with the board plugged in.

[lotas]

The resistor next to it is hard to see, are they paralleled together?

[grimreaper420]

The resistor next to it is hard to see, are they paralleled together?

I believe so. Attached a better picture

[lotas]

No, they are not paralleled, they only sit on the ground with only one terminal, but the resistor (10 Ohm) seems to have burned out (check), its burnout point is visible.

[grimreaper420]

No, they are not paralleled, they only sit on the ground with only one terminal, but the resistor (10 Ohm) seems to have burned out (check), its burnout point is visible.

Ah okay. I think that is just the picture. i tested the resistance and it is 10.4ohms. It is marked as x10

[grimreaper420]

No, they are not paralleled, they only sit on the ground with only one terminal, but the resistor (10 Ohm) seems to have burned out (check), its burnout point is visible.

ive got a really good idea, i will use the continuity and trace the path from the fuses and after the fuses and mark them down on the board. should be easier for us to understand what is coming to the fuse and leaving the fuse

[lotas]

So this is capacitor C907 in short?

[grimreaper420]

So this is capacitor C907 in short?

yes sir. 10ohms and beeps in continuity mode.

i did a continuity check of 'B' side of the blown fuse and it beeps when i touch either side of C907. Are we getting close?

[grimreaper420]

So this is capacitor C907 in short?

ive tried to draw the continuity lines, at point A, there is continuity everywhere with that side of the fuse. on the other end where the white line just 'ends' there is pretty much continuity on nearly everywhere on that side of the board so i stopped drawing the line

[harp]

i tested the resistance and it is 10.4ohms. It is marked as x10

It is 01X... letter is always on last place for EIA-96 marking

[lotas]

ive tried to draw the continuity lines, at point A, there is continuity everywhere with that side of the fuse. on the other end where the white line just 'ends' there is pretty much continuity on nearly everywhere on that side of the board so i stopped drawing the line

What I don’t understand is that continuity can be 0 Om and 10 Om and 50 Om, so it’s built into the multimeter that it beeps in this resistance range, and it’s not clear that these mosfets have two legs shorted for all of them. This could be a +20V bus that powers different modules, dc/dc converters...

[lotas]

yes sir. 10ohms and beeps in continuity mode.

i did a continuity check of 'B' side of the blown fuse and it beeps when i touch either side of C907. Are we getting close?

But it should not show 10 Ohm, unless it is paralleled to this resistor.

[lotas]

You can take a high-quality photo of this chip so you can see its markings.

[grimreaper420]

You can take a high-quality photo of this chip so you can see its markings.

i attached a better picture of the chip. i also attached pictures of the back of the board. in the picture marked A, there is continuity leading from that point to the blown fuse, and that has continuity to nearly everything on the back of the board apart from the transistor named B. there doesnt seem to be any continuity reaching that.

[grimreaper420]

You can take a high-quality photo of this chip so you can see its markings.

this is a better picture

[lotas]

Does this transistor have all legs 1, 2, 3 shorted?

[lotas]

this is a better picture

Is the last number 6 or 8?

[grimreaper420]

Is the last number 6 or 8?

it is 8. so it says 5228E