Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
The latest (the last?) on this is that I replaced the 7U05 and 7U06 MOSFETs. This got rid of the shortcircuit and the light guide (small strip of light at the bottom of the cabinet) started pulsing when I connected the power. I got my hopes up for a few seconds, but the light guide just kept pulsing and the set never got any further than that.
Another freeze spray test did not reveal any (other) shorted components.
I'm afraid that the shorted FETs might have taken more critical chips...
Globulus
Member
Last Activity: 12-05-2013, 09:50 AM
Joined: 09-13-2013
Location: Vejle
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
It has been a while since last time I looked at this.
I (finally) did the freeze spray test with an non-regulated 0.5 amp power supply. At 7.5V it would measure 12V without a load, so that was what I tried first. Not much to see. Upped it to 9V. Still not much to see, though the 7U05 (the one measuring 10 Ohm in-circuit) seemed to thaw a little quicker than the rest. At 12V (19V without a load), however, the 7U05 would thaw instantly whereas the three surrounding FETs would stay frozen.
...Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
Well, I've got a dust spray now and I have a drawer full of "wall warts" so I should be ready to do the freeze spray test.
You are suggesting a 12V 500 milliamp power supply?
I've got a couple of those, but they are not stabilized, so without a load my multimeter is telling me that they are outputting 17V-19V.
My stabilized, multi-voltage PSUs are in the 1A-2A range, but I really do not wish to connect those to a circuit which might have a...Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
Hence the resistor. This is the video I was talking about:
[url]http://www.youtube.com/watch?v=XhqwC3BFBug[/url]
The battery and resistor (12 Ohm, sorry) is seen at around 3m35s.
But good point about electricity taking the path of least resistance, thereby limiting the potential for further damage.
I was mainly concerned about the following warning in the service manual:
"Defective (in short-circuit) power MOS-FET's lead usually...Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
Here are some in-circuit source-to-drain measurements of the FDS8884 MOSFETs (cheap multimeter set to 2KOhm):
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[ATTACH]72047[/ATTACH]
7U08: 850 Ohm
7U02: 709 Ohm
7U05: 10 Ohm
7U06: 34 Ohm
With the inaccuracies of my measurements in mind, I suppose 7U05 + 7U06 (or the surrounding circuitry) could explain the 42 Ohm resistance between +12V and GND.
Yes, those FETs are cheap,...Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
Another 101 question: What is the difference between "freeze spray" sold by electronics stores and "cold spray" sold by sporting goods stores?
Can I just use the latter? The reason I am asking is that I do not have an electronics store nearby so I cannot simply pop by one of those in order to buy a single, cheap item, i.e. I either have to bundle my purchases in order to get free shipping or pay far too much (relatively speaking) for shipping when buying individual...Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
OK, I might try that, but I will probably have to put it on hold for a few days or a week. Other priorities right now (though 3+ weeks without a tv is starting to take its toll).
I appreciate all of your suggestions.Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
Actually, my parents have the exact same set. To be honest, the easiest thing would have been to start swapping out boards from the beginning, but I already know that as far as they are concerned, a tv is a black box which should not be opened by anyone but an authorized repairman, so I did not even ask them if I could use their perfectly working set for my experiments.
So come to think of it, maybe I should just keep my set and use it as spare parts for [B]their[/B] set in case...Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
I have a 12v 500mA wall wart but would have to get some test leads and freeze spray for this.
You are right in saying that I will be better off replacing the SSB board, as it would be very difficult for me to replace anything on it without tearing it up.
As for replacing the SSB board, that is probably not going to happen. No such board for sale on eBay or the usual LCD scrap yards at the moment. The flea market at the [url]www.repdata.de[/url] forum is littered with...Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
With the 1M95 cable detached from the PSU and SSB (i.e. both ends):
1M95 PSU side: 1.62 *K*Ohm between ground and 12V (6/7/8).
1M95 SSB side: 42 Ohm between ground and 12V (6/7/8).
Measurements taken with a $20 multimeter with a 200 Ohm - 20 M Ohm range. Not exactly a precision instrument but it will have to do.
I think I do have a 12V bulb somewhere but I do not think I have any cables for hooking it up. I really should get onto eBay and order a set...Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
If I probe the 9045 (ground) and 9048 (12V) jumpers with the power on, I am getting 12V (12.13V) if - and only if - the 1M95 cable is *not* attached. In this case the big transformer will give out an audible buzz all the time.
If I *do* attach the 1M95 cable, the big transformer will give out the same audible buzz but only for about a second, after which it turns into an almost inaudible buzz. At no time - not even during that first second - am I getting 12V on the 9048 jumper when...Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
I don't have the board out at the moment, but here are some crops of the front and the back of the board as well as part of the block diagram from the service manual.
12V is provided on pins 6 to 8 on the 1M95 connector.
Can you tell from those images if there are any components I should pay special interest?
[ATTACH]71360[/ATTACH]
[ATTACH]71361[/ATTACH]
[ATTACH]71362[/ATTACH]
[ATTACH]71363[/ATTACH]
...Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
Replaced all the Lelon caps with Panasonics. Some of the high-capacity ones were measuring 10-15% below (e.g. 2950 instead of 3300), but nothing catastrophic.
Unfortunately, I am still not getting any 12V power. Only the three blinks.Leave a comment:
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Re: philips 37pfl5522d lcd tv.flashing red light
Are you talking about just the electrolytic caps here or are any of the other types of caps known to suffer from any problems?
I have ordered a set of Panasonic caps to replace my Lelon ones in my 42PFL9603D. As I wrote in [URL="https://www.badcaps.net/forum/showthread.php?p=373255#post373255"]https://www.badcaps.net/forum/showthread.php?p=373255#post373255[/URL], four of the seven Lelons did not exhibit great results when measuring them in-circuit using a cheap ESR meter, but not badly enough...Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
Another thread discussing the same power supply:
[url]https://www.badcaps.net/forum/showthread.php?t=27208[/url]
This time 42PFL9703D. One comment included a service manual for the same chassis but with a picture that actually matched my power supply board at the beginning. Another comment included a reference to a document with suggested rework areas.Re: Philips 42PFL9603D won't turn on...discussing the...Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
By the way: My power supply looks exactly the same as the one seen in an attachment to last year's thread on Philips 42PFL7403D (same tv size, brand, and year, but lower series):
[url]https://www.badcaps.net/forum/showthread.php?t=21879[/url]
I read through the thread but did not come to any definite conclusions as to what to do with my own. They seem to be discussing a different problem.
I would - as a start - just replace all the Taiwanese caps on my board, but the nearest...Leave a comment:
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Re: Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
Here are some pictures of the power supply board (removed from the tv) as well as some pictures of the signal processing board (still on the tv).
The first image is a full view of the power supply board.
Let me know if you need (more) closeups of anything.
[ATTACH]70764[/ATTACH]
[ATTACH]70765[/ATTACH]
[ATTACH]70766[/ATTACH]
[ATTACH]70767[/ATTACH]
[ATTACH]70768[/ATTACH]
[ATTACH]70769[/ATTACH]...Leave a comment:
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Philips 42PFL9603D won't turn on. Need specs for Lelon capacitors.
My 2008 Philips 42PFL9603D won't turn on.
Blinks red three times. Pause. Blinks red three times. Pause. Etc.
According to the service manual, the description for this error is "12V" and the fault is in the power supply board.
I took this board out of the tv. Everything (everything!) is clean. No leaks or bulging caps. No cracked solder joints. Fuse is fine.
Having nothing to measure this with, I bought the MESR-100 v2 + M6013 combo on eBay and started out using the MESR-100 to do in in-circuit test of the caps. I have not used...Last edited by Globulus; 09-14-2013, 03:06 AM. -
Re: Philips LCD 42PFL5432D/37 - Bad PSU
I have a Philips 42PFL9603D. Not the same model. A year newer but the same brand.
I took the back off using just a T10 (Torx) screwdriver. Pretty common.
You might want to Google the chassis number to locate the service manual before you take it apart. Don't want to remove too many screws.
[url]http://english.electronica-pt.com/electronics-search.php?find=TPM2.0U[/url] LA
Download link:
[url]http://www.electronica-pt.com/index.php/component/option,com_remository/Itemid,34/func,startdown/id,7891/[/url]...Leave a comment:
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Re: New Members - please post your introductions here
Hello,
I used to play around with electronics back in the early 80's until I got my first computer, at which time I lost interest in soldering and making circuit boards.
Now that my tv has just broken down due to a faulty power supply, I thought I would pick up my soldering iron again, rather than paying someone else to do the work.Leave a comment:
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