Re: Philips LCD TV with Sound, No Picture (model 42PFL5322/10)
Yes, I now see it... But it was really the CCFL test that helped me localize the faulty area.
No, thank you! What I am wondering about now is what made the original fuse blow. Usually a fuse blows in unexpected or out-of-spec conditions, and obviously, I haven't fixed anything besides the fuse....
sagie
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Last Activity: 11-20-2011, 07:04 PM
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Re: Philips LCD TV with Sound, No Picture (model 42PFL5322/10)
Well, looks like I fixed it. It wasn't the CCFLs, but the ingenuously simple CCFL test helped me find the problem. From the CCFL test I detected what appeared to be two malfunctioning CCFLs. The two were next to each other, in one corner of the set.
It seemed to me too much of a coincidence that 2 adjacent CCFLs failed together. So I searched the power supply path of the 2 CCFLs for shared components that could've failed. I found out the 2 were sharing an SMT 3A fuse. I tested its...Leave a comment:
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Re: Philips LCD TV with Sound, No Picture (model 42PFL5322/10)
Thanks again for your help, retiredcaps.
I might save you some searching by telling you the service manual which is widely available on the Internet for this chassis (LC7.1E LA) has absolutely no information about neither the CCFLs, nor the PSU or the inverter boards, so there is no specification for spare CCFLs, etc. It appears to me as if Philips has no interest in having these parts being serviced....Leave a comment:
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Re: Philips LCD TV with Sound, No Picture (model 42PFL5322/10)
OK, as I checked the resistances a second time to write them down, I got much more consolidated readouts for some reason. This time, they were all in the range of 1300-1333 Ohms, which makes the max reading still within 3% from the min reading. I wrote all of the readings in the bottom of this message.
Yes, each of the 2 boards carries 5 medium sized caps and a small cap. They all appear to be in good shape visually (at least in my eyes).
I couldn't really...Leave a comment:
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Re: Philips LCD TV with Sound, No Picture (model 42PFL5322/10)
OK, the transformers are all [URL="http://lcdparts.net/TransformerDetail3D.aspx?ProductID=2734"]4004Q[/URL]s. I tested all 40 secondary winding pairs, they all measure in the range of 1310-1360 Ohm. Went ahead and tested the 20 primary winding pairs, they all measure in the range of 1.1 - 1.6 Ohm.
I'm assuming my readings indicate the transformers are OK. Can anybody offer some more advice?
Many thanks!Re: Philips LCD TV with Sound, No Picture (model 42PFL5322/10)...Leave a comment:
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Re: Philips LCD TV with Sound, No Picture (model 42PFL5322/10)
I tried to look in various lighting conditions, but I'll give the transformers a shot. Will update with my results.
Thanks!...Leave a comment:
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Re: Philips LCD TV with Sound, No Picture (model 42PFL5322/10)
OK, I've just read in the article you've linked I can measure it in-circuit.
Only one question remains -
Thanks again!...Leave a comment:
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Re: Philips LCD TV with Sound, No Picture (model 42PFL5322/10)
Many thanks for the prompt response, retiredcaps!
Do I have to take the transformers out of the circuit to measure the resistance, or may I measure it in-circuit?
I've read some similar text here at the forum, but I wasn't sure whether this was applicable to my situation since I can't see any picture when I shine a light on the screen. Does this makes any difference?
Thanks again!...Leave a comment:
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Re: Philips LCD TV with Sound, No Picture (model 42PFL5322/10)
I forgot to write that as the TV is turned on, the red standby LED changes to a blue LED, which remains on as long as the TV is on (regardless whether the display works or not).
When the TV is turned off the blue LED changes to back to the red standby LED.
No LED blinking at any point, except as a feedback when I use the remote.Leave a comment:
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Philips LCD TV with Sound, No Picture (model 42PFL5322/10)
Hello everybody,
First of all, many thanks for all of the good people that has been contributing here.
I got here about a year ago via Google search and was able to fix a malfunctioning LCD monitor by replacing some swollen caps, following just the advice I read here, with no need to bother any of you
I have now on my hands a malfunctioning Philips LCD TV, model 42PFL5322/10 with a 42" AUO 1366x768 LCD panel.
[B][U]Symptoms:[/U][/B] after turning set on, image shows up within about 4secs, then the display shuts down about 2secs later...
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