Re: Lg 60pz250n-zb
I'm going to invest in a soldering station and some resistors, and I will post here again once I've performed the tests suggested.
Also, as the solder is wouldn't melt with my 30W soldering iron, I'm curious what solder I should repair my board with. Any tips?
Also, what is dead solder?
Joepeff
Member
Last Activity: 10-02-2022, 05:51 AM
Joined: 11-28-2018
Location: Helsingborg
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Last edited by Joepeff; 11-30-2018, 02:37 PM. -
Re: Lg 60pz250n-zb
Yes, I am sure. I shorted the M5 with Va using my positive test lead of my DMM.
I'm quite sure the negative lead was grounded as I was testing voltages....Leave a comment:
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Re: Lg 60pz250n-zb
Indeed each of the three rings have a ring on one joint.
Bad in what sense?
I'm going to re-solder those joints now.
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Edit: turns out my soldering iron wont go hot enough for that....Last edited by Joepeff; 11-30-2018, 05:43 AM.Leave a comment:
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Re: Lg 60pz250n-zb
Since I don't have any resistors at the moment I can't run Andrews tests.
Having all boards disconnected, including Ctrl Bd, I tested M5V on J54.
With no load it read 7.3V.
I can't find Q353, and I can't find a schematic for my board in order to locate it. Could you highlight on the board where I might find it?
I searched for zener diodes to help me locate Q353 to no avail.
Only ZD101 and Q101 were next to each other, and ZD101 is the only zener diode I can find.
F302 is fine.Leave a comment:
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Re: Lg 60pz250n-zb
I see.
Well when running only the PSU (no other boards connected) the PSU will not go into protect mode. Perhaps the voltage climbs due to no load. I don't know.
To be clear: Vs and Va were both off by about 1V prior to testing, so I fixed that. I then shorted M5V and Va while testing the voltages on the power input of the Ysus bd.
1) Should I leave Zsus bd plugged in?
2) Should I leave ctrl bd plugged in?
I need to get my hands on some resistors before I can do this.
Here is an...Leave a comment:
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Re: Lg 60pz250n-zb
As I've mentioned, the pots no longer help lower the voltages. The Vs and Va pots are on minimum. Vs rises until a peak of 256V
Besides that, I'm curious as to why I should use 120Vac lightbulbs and apply 120Vac to the PSU, since we use 230Vac in Sweden..
If I should use our mains line voltage (230Vac) instead, should I still do two 230Vac lightbulbs in series?...Leave a comment:
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Re: Lg 60pz250n-zb
Here are some photos of the PSU and connectors along with an overview shot of all the boards.
I'm not sure which is the Asus board. I only see the Ysus and Zsus boards.
Thanks for the response!
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Edit: Sorry about the flipped images. They're cropped and fixed now....Last edited by Joepeff; 11-29-2018, 06:35 AM.Leave a comment:
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Re: Lg 60pz250n-zb
Any pointers would be appreciated, even if it's pointing me in the direction of giving up.Leave a comment:
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Re: Lg 60pz250n-zb
I suspect the power supply might be done for.
I disconnected all the boards, and the voltage on Vs keeps going up even though the pot is set to minimum...Leave a comment:
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Re: Lg 60pz250n-zb
After plugging in the AC cord again to do some testing, i found that Va and Vs was lower than I'd left it. After adjusting to the correct value I heard a click from the PSU and the voltage was steadily dropping.
I could sure use some help here
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So, as it turns out, I can't set Va/Vs to the correct values. Va=55 and Vs=201.
Vs is currently at 210 and wont go under 208 as I lower the pot. It just ends up shutting off the TV, which is the click I heard.Last edited by Joepeff; 11-28-2018, 12:26 PM.Leave a comment:
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Lg 60pz250n-zb
I'll start off with saying that I'm very new to tv-repairs.
With that said, I have an LG 60PZ250N-ZB in my home, which I happened to find in the garbage room.
The TV worked just fine, but I noticed some grainy noise, going mainly horizontally across the screen, in certain lighting. Could be bright or dark, mostly bright.
After some searching I figured it could be what's known as "mal discharge" so I got myself some documentation from LG for this.
Then I found this site, and Topcat wrote about the "sparklies".
I decided...Last edited by Joepeff; 11-28-2018, 12:01 PM. -
Re: New Members - please post your introductions here
Hello everyone! I'm quite glad I found this place.
Anywho, a bit about myself.
I love tinkering with things, and aim to learn more as I break things along the way.
The plan is to get a degree as an electrical engineer so that I can pursue my goal of understanding how things work on a base level.
Alot of my time is spent on forums and youtube, passively learning how things work.
But my knowledge is limited when it comes to electronics, so here I am.Leave a comment:
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