Re: Philips 47PFL8404 H / 12, chassis Q548.1ELA
Hm, the part number doesn't match up.
I'll tear down the transformer anyway and see if I can purchase same gauge transformer copper wire and redo the second winding.
Elitebook
Member
Last Activity: 07-20-2021, 08:34 AM
Joined: 02-23-2019
Location: Overijssel
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Re: Philips 47PFL8404 H / 12, chassis Q548.1ELA
Aha, guess I'll start hunting for one. Thanks.Leave a comment:
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Re: Philips 47PFL8404 H / 12, chassis Q548.1ELA
Looking at T301 secondary side only 10 & 9 are connected instead of 5 & 6. For its neighbor 6 & 5 are connected instead of 7 & 8. I did measure it again, this time correctly.
For post #6:
About CN3 and CN2 connectors, only the pin in the middle has a wire plugged in it, the outer two are un-utilized. Looking at the distribution board it has only one wire going into them.
From what I'm understanding the only connection these two distribution boards, the Left and Right one, make...Last edited by Elitebook; 08-18-2019, 01:22 PM.Leave a comment:
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Re: Post your system.......
While I've owned many systems one has definitively earned its place as my least favorite. Its one and only Dell Latitude E6540.
I bought it second hand back in 2017, it was in a mint condition. Everything works, all the documentation is present and doing some tests revealed that everything's running just fine. It was a system with an i7 4800MQ, Radeon HD 8790M, 8GB ram and 256 GB SSD. As a cherry on top it has a fairly good FHD TN panel with good contrast.
I bought it for college for the intentions of using it for what its made...Leave a comment:
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Re: Philips 47PFL8404 H / 12, chassis Q548.1ELA
Allright, I did test the transformer on both the hot and cold side. I've included this picture. The numbers are in Ohms. Black number is tested while off and green when TV is turned on. I measured it according to the drawing, I hope that its clear enough to decipher.
I've shot this video of how the CCFL tubes are behaving as a good measure.
[url]https://www.youtube.com/watch?v=RFMnuZQOqfk[/url]
Edit:
I have to add that the cold side trafo on bottom right doesn't show...Last edited by Elitebook; 08-18-2019, 11:43 AM.Leave a comment:
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Re: Philips 47PFL8404 H / 12, chassis Q548.1ELA
So I should measure it without desoldering it from the board first?...Last edited by Elitebook; 08-17-2019, 07:44 AM.Leave a comment:
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Re: Philips 47PFL8404 H / 12, chassis Q548.1ELA
The plastic holding mounts for the tubes have indeed become very brittle. The CCFL's do power on and off very fast about two or three times when I power up the TV.
Is there a way to remove the tubes without breaking them?Leave a comment:
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Re: Philips 47PFL8404 H / 12, chassis Q548.1ELA
I'm back after a long hiatus. I did tear down the TV even more and now I did access the CCFL distribution board. The pictures do show some discoloration on the PCB, but I don't exactly know if they're either caused by heat or manufacturing.
I'll try to take those tubes out one by one and see if that makes any difference.
[URL="https://imgur.com/a/gYNIvdM"]https://imgur.com/a/gYNIvdM[/URL]Re: Philips 47PFL8404 H / 12, chassis Q548.1ELA
I'm back after a long hiatus. I did tear down theLeave a comment:
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Re: Philips 47PFL8404 H / 12, chassis Q548.1ELA
When I was waiting for the parts to arrive I took these pictures that I included in the attachments. As you can see its the DPS-298CP-1A.
Yesterday I replaced these components: Q901, D907 and D909.
@otoluk, While my motherboard doesn't have a D911 it does however have a D907. The original D907, the SB2100, I measured around 175mV using diode test and compared to data sheet it should be around 330mV. Guess I replaced a part that would cause a lot of headache in the near future.
@R_J, I guess you're...Leave a comment:
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Re: Philips 47PFL8404 H / 12, chassis Q548.1ELA
Hello,
Do you have a photo of the power supply and also, do you get weird sparking and buzzing sounds when powering your TV?
The 4 capacitors you've replaced (C731, C709, C734 and C705), how did they originally look like? Were they burnt up and had dark brown green color? And did you replace them with the exact same type 33pF 6kV (C709, C705) and 47pF 6kV (C731, C734)?
I actually own the 37 inch version of the same television with the same power supply and, unfortunately, with the similar issue....Leave a comment:
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Re: New Members - please post your introductions here
Hello all,
I'm an electrical engineering student and I would like to apply my theoretical knowledge into something practical, like doing a repair that I've never done before. Repairing a TV for example. It would be an interesting learning experience.
Maybe we see each other in the forums
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