Hello.
I found a bad smoothing cap efter the 230-24V transformer. The specific one are mounted on the negative side of the diode after the transformer on the 24V side. It supplies +24vdc and -24vdc
it's a 50V 22uF one. The closest I found at home is rated 100V, 39uF. Can I use that or what could fail?
Henke
Member
Last Activity: 04-22-2025, 12:35 PM
Joined: 10-27-2022
Location: Smaland
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I put a small NVM.eed file on the stick and loaded it in usb port 1. As William wrote, the tv probably got into a T-con protection, and that file overruled it. so the fault is probably still there but have to try it little bit more to se if i notice something with the picture.
But is the TV still safe to use with that kind of solutions??... -
it started up now. I downloaded a software with a usb stick. Thanks for all the help!...Leave a comment:
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Used a usb tester now. Activity when turning on the mains for a few seconds, after that nothing....Leave a comment:
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Here is the picture over the mb. No voltage on the
caps that goes to usb etc....Leave a comment:
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About the software I meant...Leave a comment:
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No, not what i can se....Leave a comment:
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Ok, can you please explain little bit more in detail 👍...Leave a comment:
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The powerboard is ok, but don’t get the ps_on from main board....Leave a comment:
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Philips 55POS9002/12 - No PS_ON voltage from main board
I wondering if there are some usual faults regarding the PS_ON signal from main board to PSU board?
Where do i start looking?
I have standby light and the PSU is working if i connect 3.3V to the PS_ON pin on the psu board.... -
Do you have the schematic for the main board as well?
Or do I need to buy a new one as I don’t get the PS_ON signal to psu?...Leave a comment:
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Ok, now I connected only psu board and 3.3v from my bench supply to PS_ON. 8,6V rises to 12.55v as expected 👍 but the 24V_A pin (MB connector) also have 12.55V. I don't now what's happening there? Seems only to be separated by a few inductors from the 12V potential.
But can we now confirm that the main board is the issue?...Leave a comment:
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Is it enough if I connect my bench psu to PS_On?
is it 3.3v?...Leave a comment:
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Ok. Now I am pretty sure that it’s flashing 3 pause, and then 40.Leave a comment:
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It's flashing very rapidly. It's impossible to count. But first 3 ast and then pause and then around 40 very rapidly. Then it starts over.
i tried to film in slow motion and count. its around 40, but still hard to count....Leave a comment:
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Hmm. Maybe it’s something wrong with the MB then.
I don’t have the remote, but it should work by pushing the button in the back?
the led in the new picture is constantly flashing. Any clue what that means?...Leave a comment:
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Now with everything connected i only have 8,6v on the 12v socket that goes to MB. Same on the 24vA...Leave a comment:
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This was without load. Only the psu board itself. Tried with all connected together, but no 12 or 24v either. Maybe do I need the PS_on/off from motherboard first?...
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Ok, thanks. But now it seems that it is more problem than i thought. 12v and 24v are not working. The chip (in new picture) that will drive the mosfet for the transformer seems to have a pulsating voltage on the Vcc, so i don't think it starts up. Any thoughts about that?...
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