THE PERILS OF IMPROPER AI USE! THE PREVIOUS TWO POSTS ARE INCORRECT. I CAN'T DELETE THEM! CAN THE MODS?

I guess I can't edit posts. Anyway, I was wrong about that. I have a couple numbers mixed in my head, and the AI's got all confused too. They can only work with what you give them!
So, the supply going to the LED driver circuit is at a nice 150, and it's RIGHT. I became even more sure when I realized the smoothing caps were 200V rated. I had it in my head that the LED circuit was a buck converter, since the AI told me it was, but again, I don't blame the tool if I don't know...

Just got more interesting. There is only a smoothed 150V coming out of the transformer at the bottom of the pics which is feeding the LED circuit through the two outermost pins. Now I need to figure out if it's the Xformer, OR the power entering it!

[B]I've been looking at the board, and discussing what I see with Claude. Does this summary from Claude seem right??
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Your Signal Path Analysis:[/B]

[B]High Voltage DC In:[/B] 300V+ from transformer/rectifier [B]Through Inductor:[/B] Energy storage and current smoothing [B]Through High-Side MOSFET:[/B] (The one on the heatsink) - this switches the current on/off [B]Through Current Sense Resistor:[/B] Provides feedback for current regulation [B]Through Filter Caps:[/B] Smooths the switching...

This was my initial thread.. [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-tvs-and-video-sources/3602081-sony-kd-70x690e-started-with-reset-loops-then-it-got-more-complicated-i-m-at-wits-end[/url]

(All the Electrolytics are brand new.)

I started a new one, hope that's ok, because my question is different now! (Strangely enough, after I walked away for a few weeks, it stopped lighting up at all!!)
I am determined to fix this power supply because I have the skills to replace bad components, I just need...

Thanks for the reply! I use metric all the time, no worries! I have a well set up lab.
Let me see if I understand... Jumper the 5v-tcon on-Power on terminals. That power wire thing... Are you aware that there is a separate power cable direct from the power supply to the T-Con? Bottom of the board, closer to the right. I think the T-Com power to the mainboard might be for monitoring.. There is continuity between them anyhow, so the T-Con is getting power already from the power supply.
So I earlier removed the mainboard connectors, jumpered those 3 pins, and (with power still to the...

My friend [B][URL="https://www.badcaps.net/member/13553-davi-p"]Davi.p[/URL][/B]​- you are obviously the kind of guy I need to talk to !! I am having trouble understanding your instructions though. I don't know where the 'T-Con Fuse' Point to connect to is! Also, How can I power up the power board with the MB detached? I am assuming I need the power board to run the backlight for this, so I don't think you mean a bench supply. I tried going from the 5V Stanbdby to the Power On, and the T-Con On, to trigger them, but no life. No damage either though! Thank you SO much for the tips!...

Thanks for the input guys! I forgot I posted in here for a day or two!

The expected voltages are coming from the power board. And yes, I have checked all of the components on top, Any that were 'weird' I pulled out of circuit. I will get those pictures. Actually, I have the top one now!
Easybone.. I attached the diagnostics screen. Is the backlight power derived from the T-Con 12V line? That might give me a connection between the wonky T-Con voltage I saw on the scope and this backlight error... I need to re-scope that voltage line to make sure maybe.

Note also...

First of all, thank you everyone who helps others in here! You guys are treasures! Please bear with me, this may be long. I have tried a LOT.

First, my wife said the TV was turning off and on. When cold it would be fine for several minutes, then it would start resetting.
I opened it up and noted there are two main lines coming out of the supply besides the backlight., The T-Con 12V line and the main 12V line.
TRIED 1 - I scoped power coming from Power Supply while it was all still connected. I noted that just before it reset, the 12V line going to the T-Con was going...

Hello there. I'm Phil, from Alberta. I'm a hobbyist, getting more serious over time! I really appreciate being able to share and benefit from experience with others!