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Help me please to fix my Led TV
Help me please to fix my Led TV
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Old 17th February 2019, 10:16 AM   #11
JMFahey is offline JMFahey  Argentina
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Funny thing is that diyiggy´s comment was quite light and unobtrusive, not as if he were yelling his lungs off standing on a soapbox or constantly deviating thread focus.
On the contrary, it was a comment on (the frequency of) a failure.

That said, I have the opposite view

I think 8 years service life for a *wonderful* piece of equipment, tecnologically advanced and very complex, made by the Millions and for such a low price (considering what it involves), is truly a "Modern Marvel"(as defined by History Channel ) and we should be happy for having it available.

Again contradicting , I don´t see "planned obsolescence" here, 8 years of good service are way beyond any realistic Warranty time.

And failure is most probably repairable as mentioned above, it´s just that this TV is *so* cheap thanks to massive automated production, that fully replacing it by a new one is economically possible, compared to Service Tech man hour cost.

But that´s nothing evil, quite the contrary.
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Last edited by JMFahey; 17th February 2019 at 10:19 AM.
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Old 17th February 2019, 12:34 PM   #12
diyiggy is offline diyiggy
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Default Funny House

Thank you guys for the help provided and nice posts.

Well I'm afraid to have not enough skill to dive deeper than the first onion ring which is the plastic back cover. there are two boards only after the cover, the smps board and the massive tinny smps parts I/O board (ethernet, antenna, YUV, etc).

But I will try as I have nothing to loose thanks the good advices and links. It is surely the back light system but it's after the second metallic onion ring which seems complicate to remove with many metallic clips.

Anyway, lesson learned, next TV will be cheaper to save for the further next one and because my mother doesn't look at Marvel movies but mainly historical or scientifical channels and sometimes food channels, so no needs of complicate enhancer codecs. (apologize to Art M about mother's life you certainly don't care either ... all those onions makes me cry).

best regards to ALL of you

Last edited by diyiggy; 17th February 2019 at 12:36 PM. Reason: edit
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Old 17th February 2019, 05:08 PM   #13
diyiggy is offline diyiggy
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Default Philips 40PFL6636H/12

Hi again,

I have found many valuable Youtubes on how to disassemble a Led TV thanks to the "key words" provided in the thread. . In fact few boards : a smps, the main AV boards and the famous backlight inverter board hiden on the front side of the TV.

The second layer I was talking about is in fact the main aluminium body and the back leds and backlight inverter board is in fact on the opposite side, i.e. towards the display panel side. So one has to remove the edge, the screen, the delicate transparent film... trying to avoid dust as said in this thread.

Thanks to the inputs here one indeed can find on ebay some inverter board, not expensive, worth a try. But not so many boards avaliable. 8 eight year is for sure a long time for such consumer products as already mentioned.

One has to have skill to find the reference on the net. If Ebay is not good enough then Tobao is perhaps the place if one can speak chinese.

There are also Youtubes on how to swap one led only instead a complete leds strip. But again one can also buy those leds strip.

Sourcing those parts is tricky. It is not like to choose a part at Mouser or Digikey !

Your inputs helped a lot
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Old 17th February 2019, 06:03 PM   #14
lcsaszar is offline lcsaszar  Hungary
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Does the PSU board look like this?

Philips power supply 272217190318 40PFL6606H | eBay

The LED strips could be tested separately, but one needs some skill and a current generator. Is there no repairman/service centre around at your place?
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Old 17th February 2019, 06:29 PM   #15
diyiggy is offline diyiggy
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Default thanks

Hi,

Exactly this one, thanks ! Yes this is the Power supply board: caps seem good on mine : capacitance value are ok ! Although I have sound and can swap between channels ! Just a dark ground with the image "behind" you can see when very close to the board, so it's not a smps failure but if the inverter board is embeded on it and if so your link is just wonderfull, didn't find it myself despite I entered the ref ?!

Seems everyone agree it should be the inverter board. One can buzz also each led to see if they are broken or not as they are in serie for the few I understood and the videos seen. My idea is just to swap a board if not expensive or to see if it is a or the strip if a standalone parts.

I have yet to futher dissasemble the TV to see the leds and the backlight inverter board. This issue often happens from what I readed after the tips here and some diyers try to fix it themselves. Working cost will be the same than a new TV today for the screen size I have (40").
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Old 19th February 2019, 03:12 AM   #16
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by thimios View Post
Probably you have some burned led.
Google, led t.v bars, and you will see how they looks.
These are behind to lcd screen. Disasempling the lcd isn't an easy work.
You must be very careful! It is very fragile!
Led are in series, one is burned all are dark.
Use a battery to test one by one.
First of all!
Use google to find the cost of your bars.
May be cheaper to buy a new t. v.
If you find one burned LED just bridge it with a resistor.
Saves stripping out the lot for the sake of one duff LED.
The LED's should all have same resistance using a diode checker on your DMM.
The bad one is most likely open circuit.
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Old 22nd February 2019, 04:34 PM   #17
RJM1 is offline RJM1  United States
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Good place for LCD TV parts if you are in the USA.
TV Parts: LCD TV Parts, Plasma TV Parts, TV Repair | ShopJimmy
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Old 22nd February 2019, 04:42 PM   #18
diyiggy is offline diyiggy
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Thanks,


Yup, saw their Youtubes as well.
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Old 1st March 2019, 01:16 AM   #19
popilin is offline popilin  Argentina
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Quote:
Originally Posted by diyiggy View Post
Hi,

I need a tip please. Don't know if it's the good section of the forum, sorry if not.

My 8 years Philips edge leds TV has no more image. At least there is one in the background on the dark screen: one can see it when very close from the screen.

Leds are around the screen (edge led TV) but I have sounds, no problems to lock on different channels. It's "just" the screen.

I thought about caps on the main smps board and I removed the back of the TV. Samwa capacitors have perfect flat top... all seems good, although I didn't measure yet their capacitance. Btw the main smps caps are 3x Long Life 68uF/450V.

Have you any experience of such thing. Could it be something else like active parts, leds, whatever ? I haven't removed the further metal back towards the screen, perhaps there are some smps lytics there ?

Have to said I had a little dark shadow area on an edge of the screen for some weeks, but still an image behind till yesterday. This area had also appeared on area to disseaper and comme back elsewhere till today ! That's why I think about the power supply without knowing if it's the main or perhaps a local cap elswhere (which I wouldn't fix in this last case).

Many thanks if any idea, well I can still listen to music on my hifi anyway
Most likely you have some LEDs open, sadly you must to disassemble the display, check them one by one with a low voltage PSU and change the bad ones.

Maybe youtube has an instructive video which can guide you through the process.

Some tips

i) The LCD panel is extremely delicate, put a piece of about 4mm plywood (or similar) under it to not curve it. If your display is e.g. 40" the piece of plywood must be a little larger, say 42".

ii) Take the plastic sheets (Under the LCD panel) all together with some adhesive tape in one or two corners, so the order does not change and be cautious because big plastic areas can create big electric charges and high voltages in the order of tens of KV, do not worry it won't kill you, but it hurts, believe me.

iii) Remove the white paper, which is normally fixed with plastic clamps and now you can see the LEDs.

iv) With a low voltage PSU (say 12V) and a 1K series resistor you can search for defective LEDs, carefully remove the plastic optic and change the respective LED.

If you live in the first world maybe you can buy all the LED strings and put them all new, easier but costly.

v) Carefully glue the plastic optics again, silicone adhesive works very well. Warn you that you must check again one by one (with plastic sheets on) the diffused light of all LEDs. Worst case you must re-glue a couple of plastic optics until the light cover the whole display area more or less uniformly.

vi) Reassemble the display panel, and be gentle with LCD panel edges.

vii) If everything goes right, put the backlight intensity on 50% and enjoy.


Good luck!
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Old 1st March 2019, 01:22 AM   #20
Shawnstium is offline Shawnstium  United States
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Albeit this isn’t a tv this could be helpful to someone. DK LABORATORIES
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