artefacts Lg60PZ550

[pasdebip]

Hi

Excuse my poor English, I'm French.

A friend gave me his TV A Lg 60PZ550_UA .
This one had an image with holes.

Here is one of the flaws

https://img110.xooimage.com/views/0/...9-54825ca.jpg/

By activating the test pattern here is what I found

https://vimeo.com/271719070

I managed to really improve the image by setting Vy to +8v.
But there are still several shortcomings

https://youtu.be/Ockpf6fJa2I

This defect is clearly visible on the whites

https://img110.xooimage.com/views/7/...9-549f0b0.jpg/
On the black background I also notice a swarm of green and white dots.

These defects are almost absent on the TV antenna but very visible on a video via USB.
When I run a white clean the image is perfect during this test

I also rewelded the induction coils without any more success, and changed the ctrl card .

I don't know what to do anymore.

Thanks

Daniel

[Jazzotiti]

Re: artefacts Lg60PZ550

Hello Daniel.
Can you take pictures of different electronic cards.
Power supply.
The Zsus card
The Ysus card.
Control card
What are the tensions noted on the power supply connector.
VS VA ..... and the others.
You must have a label stuck on the slab indicating the main tension that should be present.
It looks like a Z card problem down but you have to tell us much more.
Impossible to advance more without adequate information.
cordially
Thierry

[Jazzotiti]

Re: artefacts Lg60PZ550

Hi see me again
I found the repair technician manual
LG television on the page of this site.

Download it, it's in PDF format.
cordially

Thierry

[pasdebip]

Re: artefacts Lg60PZ550

Hi Thierry

Thank you for your Help.

Here are the voltage readings:
Va 56v
Vs 204v
VZB 112v (adjustment to 107v)
VSC 152v
Vy -186v
M5v 5v

http://zupimages.net/viewer.php?id=18/24/okkl.jpg

Here are the pictures of the cards



http://zupimages.net/viewer.php?id=18/24/j4fh.jpg

http://zupimages.net/viewer.php?id=18/24/1ypc.jpg

http://zupimages.net/viewer.php?id=18/24/hbs5.jpg

http://zupimages.net/viewer.php?id=18/24/pcy4.jpg

http://zupimages.net/viewer.php?id=18/24/k9ak.jpg

Thanks

Cordially

Daniel

[Jazzotiti]

Re: artefacts Lg60PZ550

Hello
Check the fuse on the ZSUS board
Please, I can not read the reference of the ZSUS card.
You must read the reference on the picture you posted, if you can not, I can not see that either.
You must have an EAX type reference .............
Please try again a clearer picture of the zsus.
SInon, the measurement values are in accordance with the label of the panel
cordially
Thierry

[pasdebip]

Re: artefacts Lg60PZ550

Hello

The fuse on the Zsus card is ok.
The card reference is EAX62076601

Cordially
Daniel

[Jazzotiti]

Re: artefacts Lg60PZ550

Hello
Ok, so the fuse is not cut.
What can you find on the P102 connector.
The voltages are shown on the printed map, I am using a photo found on the web to try to help you.
Sorry to say but Z card photos are unusable.
There is a connector at the bottom of your card but we can not see anything exploitable.
Can you tell me if your fault is similar to the video link?
https://www.youtube.com/watch?v=aS9WxoK-Kv8
Sorry for my bad english but I'm french.
Cordialy
Thierry

[Biruslapio]

Re: artefacts Lg60PZ550

Did you try to adjust SET_UP and SET_DN? On the Y-SUS,2 potentiometers close to the heatsink,adjust caurefully and remember their original positions,poor adjusting can cause more image errors and make the panel more susceptible to burn in.

[pasdebip]

Re: artefacts Lg60PZ550

Normally this picture is better.

https://zupimages.net/up/18/24/vv9i.jpg

Va and Vs voltages were taken from this connector.

The defect on the video indeed resembles what I had initially before modifying Vy

Here's what I have now:
almost only with usb port
https://zupimages.net/up/18/24/awwa.jpg

And on all black backgrounds the video was taken near the screen to better visualize the defect.

https://youtu.be/Tm_WiDXazx0

Cordially

Daniel

[pasdebip]

Re: artefacts Lg60PZ550

Did you try to adjust SET_UP and SET_DN? On the Y-SUS,2 potentiometers close to the heatsink,adjust caurefully and remember their original positions,poor adjusting can cause more image errors and make the panel more susceptible to burn in.

Hi
yes but without effect on the fault

Daniel

[pasdebip]

Re: artefacts Lg60PZ550

the defect of pink points is increased on all the sources except the tuner

[Jazzotiti]

Re: artefacts Lg60PZ550

Hello

I thought from the beginning to a failure of the ZSus card.

But, I'm not sure now.
Since the new settings, the picture comes quickly?
Does it take the entire width of the screen or a dark area at boot time?

In case it is defective, there is a repair kit but it is suitable in the case of a cut fuse and short-circuit mosfet transistors

The state of the electronic welds should be carefully checked.
on the Zsus card and the Ysus card

Cordially

Thierry

[pasdebip]

Re: artefacts Lg60PZ550

Tonight I'll take a video of the start of the TV, this one looks a lot for a split second like what you showed on your video.

I ran the Y and Zsus cards through the camera without finding anything obvious.

I didn't specify it but if I don't use the APS image mode on the tuner the pink dots reappear but much less than on the other sources.

Thanks Thierry

[pasdebip]

Re: artefacts Lg60PZ550

Here is a video when the TV is turned on

https://youtu.be/GBVsEefJ3oI

The horizontal stripes are not visible to the naked eye

Daniel

[Jazzotiti]

Re: artefacts Lg60PZ550

Hello Daniel

In view of your video, it is not a problem of ZSus.

But, Something really makes time to settle in the TV.
It would be necessary to seek at the level of the regulation of the various tensions.
Did you gently tap the cards to see if your electrical contact was good?
Check welds on different capacitors, regulators and all that can heat.
Also check all the welds on the connectors of the different cards, also verify that the supply voltage is on the control board and does not vary at start-up.
Be careful when you control the power board, the primary part can keep voltages of the order of 400 volts on the filtering capabilities. check with volt meter.
Normally, a resistance in the circuit discharges the capacitance.
Otherwise, a resistance of 1k about 1 watt can do the trick to discharge the capacitors
Controlled well the nappe of the control board towards the other circuits and their connection

Cordially

Thierry

[pasdebip]

Re: artefacts Lg60PZ550

Hello Thierry,

Thank you for your help

I used a camera already controlled the hot spots without finding anything abnormal but I will start again (it is long....)
Between now and Friday because I am at work I will also look in more detail at the connections and layers of the six maps.
I'll try to control the voltages Vx at startup.

What I can already say is that on the Zsus card a runway is taken off at the foot of a capacitor, without breaking the continuity in the air to be good( ohmeter).
I glued this one back on and ironed a welding film to reinforce it.
This track took off when I took out the capacitor to check it the fault was already present before.

This is the progress of the project

Have a nice day

[pasdebip]

Re: artefacts Lg60PZ550

Good evening
I just dismantled the six cards, I didn't find a bad solder.
Then TV on the USB source to see if my actions changed anything I tapped all the connections as well as the components .

Nothing change...
I still have to control the starting voltages.

Is it worth checking all capacitors by removing them (voltages ok)?

Can the motherboard be the cause?

Thank you

[pasdebip]

Re: artefacts Lg60PZ550

Hello

Here's the latest news,

I checked the voltages at startup except VZB which rises to peak at 127v and then goes down to 107v I found nothing abnormal.

Friday I had a tech from lg who was thinking about an old tile or a filtering problem on the ysus card.

Here is a copy of his email
"Hello,
Top and Bot are the cards to the left of the Ysus.
With use, if poor filtering is performed, the Ysus may be "tired".
It may be another card, but it's no longer available."

I haven't made much progress...

Translated with www.DeepL.com/Translator

[sordids999]

Re: artefacts Lg60PZ550

Have u tried re-flowing the coil solder joints on the zsus ?
Checked the buffers for shorts on the ysus ?

[tvtimmy]

Re: artefacts Lg60PZ550

If they look like this, on the ysus or zsus, they are bad.