Re: Philips 50pfp5532d - no picture but sound
Okay...there seems to be a variable resistor that controls the Vs voltage. According to whats printed on the board, turning it clockwise increases Vs. Can't I just use that to "fix" the low voltage?
Strike1
Member
Last Activity: 02-27-2014, 02:45 PM
Joined: 07-24-2013
Location: Manchester
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Re: Philips 50pfp5532d - no picture but sound
I've been putting this off for a number of days, but with a bit of liquid courage, I took the TV apart again and got to the PSU.
I couldn't find any fuses other than the ones I'd already tested. No visible signs of damage on either side of the PCB.
There are two sets of components that do look like they have burnt out. They're attached to the heat sinks, and are surrounded by a halo of black material. It could just be dust but it's not as easy to remove with compressed air as other areas.
...Last edited by Strike1; 08-02-2013, 01:42 PM.Leave a comment:
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Re: Philips 50pfp5532d - no picture but sound
What does repairing the PSU involve? Where do I begin? Would the kit you linked to on ebay be enough?...Leave a comment:
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Re: Philips 50pfp5532d - no picture but sound
Okay..done
First I checked Va with everything still connected, it was 0.4V.
Then I disconnected the right board (not sure if it was Z or Y sustain board).
Vg=14.9
Vs= 2.2
Va=0.54
Then I disconnected both boards (left and right)
Vg=14.7
Va=0.3
Vs=0.84
Then had the left board disconnected, right board connected
Vg=14.9
Vs-2.1
Va= 0.43
Then finally tried with everything connected again
Vg=14.9
Vs=2.7
Va=0.43...Last edited by Strike1; 07-28-2013, 06:23 AM.Leave a comment:
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Re: Philips 50pfp5532d - no picture but sound
I had a good look at the board when I took it off and cleaned it. I couldn't see any signs of damage anywhere, although the coils looked very dusty...maybe there's a short in them?
The green LED is on the board bottom right of the PCB, just below the heat sink on the right. I used flash so you can't see it easily but it's just on, not flashing or anything.
I've taken pictures from a better quality camera. I can take pictures of specific if you want.
Thanks again!...Last edited by Strike1; 07-27-2013, 12:00 PM.Leave a comment:
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Re: Philips 50pfp5532d - no picture but sound
Ok, I replaced the cap but the problem remains. There's two green leds that shine, one on a board connected directly to the PCB, another on the board below it. Not sure what that means.
I checked the voltages coming out, Vs was 2.75, Vg was 14.91. Seemed lower than I would have thought.
According to a table printed on the PCB, the output rating for Vs is 200-215v, and Vg is 15v. Does that mean the PCB is fried?Leave a comment:
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Re: Philips 50pfp5532d - no picture but sound
Great. I'm heading down to my local electronics store to pick up the cap. If it doesn't work I'll probably just buy that kit, it'll save me a million trips to maplins.
Hopefully it'll work, and my mum can go back to watching corrie on a plasma instead of an ancient 24" CRT!
Thanks for the advice....Leave a comment:
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Re: Philips 50pfp5532d - no picture but sound
It has two:
Lj92-01513a
Lj92-01511a
First one is for 42", second is 50". I guess the same part fits both versions of the tv....Leave a comment:
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Re: Philips 50pfp5532d - no picture but sound
The blown one is a 3300uF 10v capacitor, the other one is 25v 1500uF. Should I replace it anyway?
I've examined the power board using a light, I couldn't see any signs of damage or burning, it's a little difficult to see the MOSFETs (?) under the heat sinks.
Should I just replace the capacitors and try the tv out again?...Leave a comment:
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Re: Philips 50pfp5532d - no picture but sound
Here's the capacitor in question, and a second picture zoomed out to give some perspective....Last edited by Strike1; 07-26-2013, 11:23 AM.Leave a comment:
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Re: Philips 50pfp5532d - no picture but sound
Okay, I've checked fuses on the left and right boards, they seem to be okay.
The centre board, which looks like the PSU seems to have a blown capacitor. I've not had much experience identifying bad caps but this one seems pretty obvious...
According to the specs it is a 10v 3300uF capacitor.
Could a single capacitor be the cause of the loss of picture?Leave a comment:
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Re: Philips 50pfp5532d - no picture but sound
I've taken a picture...this is what it looks like with the back off. Which component is which?...Leave a comment:
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Philips 50pfp5532d - no picture but sound
Got a tv in this current state. I've read a few threads on this or similar samsung models. I've taken the back cover off and all connectors seem to be well connected. What's the next step? Check the Y sustain board?
A lot of the components are covered in dust. Is it ok to clean it up using compressed air, or is it not worth it? -
Re: New Members - please post your introductions here
I've been reading this forum for some time...lots of useful information and very helpful and knowledgeable people on here. My main interests are medical and optical technology, but I have other interests too.Leave a comment:
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