Re: LG 42PW451ZD - Z-SUS Zener Diode 2 Missing
Hi all,
My problem is now solved, I replaced the ZSUS board and the colours are back to normal.
I ordered more parts and will still try to fix my old ZSUS board.
Cheers
Salvatore057
Member
Last Activity: 05-18-2021, 11:51 AM
Joined: 04-02-2018
Location: Alsace
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Re: LG 42PW451ZD - Z-SUS Zener Diode 2 Missing
Hi,
Here are some updates on my issue.
I finally managed to get a picture on my TV with both ZSUS and YSUS plugged but the picture is blurred and purple (see pictures attached).
What I did is to replace Q708, Q709, Q703,Q713 and the IC702 on the YSUS and install the 20V Schottky diode that was missing on the ZSUS.
Do someone know why the picture looks like that?
Is it the ZSUS that is still faulty like described by tom66 in his troubleshooting guide?
[URL="https://www.badcaps.net/forum...Leave a comment:
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Re: plasma TV Lg 42w451 - why is the zsus igbts damaged when the ysus is plugged?
Hi,
I have made some progress, I removed the damaged IGBTs from the YSUS board (they are located on the SUS_UP part).
I plugged back everything including the ZSUS board where I have changed the 30F124 IGBTs (also located on the SUS_UP), and now the TV powers up with a blurred but watchable picture.
I have found a repair guide for the 42PW350 TV and luckily the boards from this TV are the same that the ones in my TV (I have attached a summary page if that can help others).
I...Last edited by Salvatore057; 05-01-2018, 01:13 AM.Leave a comment:
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Re: plasma TV Lg 42w451 - why is the zsus igbts damaged when the ysus is plugged?
Hi, thank you for your reply.
Below is a picture showing the back of the TV with the different boards:
Below is a picture of the Power Board:
The ZSUS Board is receiving VS, VA and +5V from the Power Board. I have checked the voltage when the ZSUS is unplugged and they appear to be fine.
Below is a picture of the ZSUS Board which is directly linked to the Power Board:
The YSUS Board is receiving VS, ER and +5V from the Power...Leave a comment:
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plasma TV Lg 42w451 - why is the zsus igbts damaged when the ysus is plugged?
Hi all,
I am trying to fix my plasma TV which is not powering on due to damaged IGBTs. I have changed two igbts and 2 IC drivers on the zsus and also two igbts on the ysus.
Now everytime I plugged the ZSUS and the YSUS boards to the power board, the two 30f124 IGBT on the ZSUS are damaged and the TV stays in standby mode. When I plug the ZSUS board alone the TV turns ON but I do not see pictures. When I plug the ZSUS board without the two 30f124 IGBTs and the YSUS board, the TV powers on with a picture.
I am lost, should I change the YSUS board? Is the YSUS board damaging... -
Re: LG 42PW451ZD - Z-SUS Zener Diode 2 Missing
Hello,
I did another test to check if the YSUS board was responsible for the ZSUS being damaged.
I removed the shorted IGBTs from the ZSUS and plugged the ZSUS back in the TV with the YSUS... and then miracle I had a picture on the screen.
So the YSUS seems to be ok.
I have now replaced the FAN73711 from the ZSUS and also replaced the IGBTs. I will wait today to see if I get the diode I ordered. If not I will try to mount a larger Schottky diode just to do a test (SS14).Leave a comment:
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Re: LG 42PW451ZD - Z-SUS Zener Diode 2 Missing
Hi,
Did you finally solve your problem?
I received some parts to fix my TV today but not yet the missing zener diode.
I took a chance in replacing the 30F124 on the ZSUS with some 30J124 leaving the space empty where the zener diode should be (because I think that they have a protection diode inside).
I replaced the YSUS shorted IGBT as well.
I first tested the ZSUS w/o plugging the YSUS and the TV turned ON without picture but I had some sound and the voltages were fine. I then plugged the YSUS to the...Last edited by Salvatore057; 04-25-2018, 11:17 AM.Leave a comment:
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Re: LG 42PW451ZD - Z-SUS Zener Diode 2 Missing
Hi,
Are the IGBTs that are getting damaged on the Y-sus the two IRG7IC28U?
Have you replaced the IC drivers? Maybe, they are getting damaged because the IC drivers are bad.
Have you checked solder on the two big coils?Leave a comment:
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Re: LG 42PW451ZD - Z-SUS Zener Diode 2 Missing
Hi,
In order to test the zener diode I removed the 30F124 that was linked to it and then I check for continuity.
Regarding the IC, I did not check it and I am not sure that there is an easy way to check it. But it is recommended to replace the driver IC when replacing an IGBT. If you do not do that, I think that there is a high chance that you will have to replace again the IGBT.
When you say that you replaced both IGBTs and it did not help, is your TV still clicking? Have you only connected the ZSUS w/o the...Leave a comment:
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LG 42PW451ZD - Z-SUS Zener Diode 2 Missing
Hello everybody,
I am new to this forum or at least a new member because I used to read a lot of useful informations since several months.
I am trying to repair on of my TV which the relay is clicking while I try to turn in on.
Thanks to the useful advices I have located the issue on the Z-SUS board and maybe on the Y-SUS on as well (I need to check it later).
The issues I have found on the Z-SUS board were two shorted IGBT 30F124 that I will replace with two 30J124 and also change the IC7 and IC8 on the board. I also noticed a short Zener Diode noted ZD2 attached to... -
Re: New Members - please post your introductions here
Hi everybody, I am Salvatore from France. I am not an expert in electronic but I like from time to time to give a second life to my broken electronic device as a hobby. I hope to find some useful information to fix my broken devices and also help others by solving my issues.Leave a comment:
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