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hannesmen replied to 42PT353 ZSUS faulty or the panel???

in Troubleshooting TVs and Video Sources

05-04-2016, 02:21 AM
Re: 42PT353 ZSUS faulty or the panel???

All right, after waiting for nearly one month to get the parts I can report a success story.

I did replace the two IGBTs 30F124 and their two driver ICs FAN73711 on my ZSUS board (EBR68342001).
And this time I did tight all the screws of the ZSUS board firmly. And what surprise: the TV is working again .
I have to say that the solder work was very heavy for someone which soldering times are already long time ago.
Especially to solder the driver IC was very tricky work and I wasn’t sure if...

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Last edited by hannesmen; 05-04-2016, 02:23 AM.
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hannesmen replied to 42PT353 ZSUS faulty or the panel???

in Troubleshooting TVs and Video Sources

03-30-2016, 08:29 AM
Re: 42PT353 ZSUS faulty or the panel???

Folks,
I was really digging for a technical or service document with part lists and error handling but failed to find one.

Does anyone can help with a tech doc for LG42PT353 (or a very similar model)?

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hannesmen replied to 42PT353 ZSUS faulty or the panel???

in Troubleshooting TVs and Video Sources

03-25-2016, 08:17 AM
Re: 42PT353 ZSUS faulty or the panel???

@Receey: Thx & I like your motto. Hopefully I will not give up and get my TV working .

Btw, you always say the Fets can get bad without screws. Is this also valid for the IGBTs? Because the Fets on the board are ok and IGBTs are faulty?

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hannesmen replied to 42PT353 ZSUS faulty or the panel???

in Troubleshooting TVs and Video Sources

03-24-2016, 09:55 AM
Re: 42PT353 ZSUS faulty or the panel???

Sorry don't understand that?...

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hannesmen replied to 42PT353 ZSUS faulty or the panel???

in Troubleshooting TVs and Video Sources

03-24-2016, 08:30 AM
Re: 42PT353 ZSUS faulty or the panel???

I'm one step further

I wanted to desolder RD2004 but failed ... so I took a cutter as I thought it is bad anyway. But to my surprise the diode is working out of circuit .
Anyhow, I need a new as the legs are too short now.

Did the same for the two IGBTs 30F124. And these are bad (lucky me).

I have to ask again, is it really possible that that the missing screws caused to fail the IGBT???

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hannesmen replied to 42PT353 ZSUS faulty or the panel???

in Troubleshooting TVs and Video Sources

03-24-2016, 03:26 AM
Re: 42PT353 ZSUS faulty or the panel???

The Mosfets AUK SMK0825 look good to me. I can measure for all Mosfets a working body diod[B][/B]e.

[B]Btw, does anyone knows what could cause to break the IGBTs and diodes on the original Z board?[/B]

Before I do buy and spend money for a new Z board again I would like to try to replace the faulty parts on it (at least those I discover).
If I would get the parts easy it would be worth a try. But after a first search with Google I'm not really confident to get them easy.

So far I found:...

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hannesmen replied to 42PT353 ZSUS faulty or the panel???

in Troubleshooting TVs and Video Sources

03-23-2016, 07:08 AM
Re: 42PT353 ZSUS faulty or the panel???

Ahhh, if this is true I could hit myself.

The YSUS board is connected from the Z board. I checked the YSUS and measured a high resistance value (0,350 MOhms) between Vs and Gnd. And most of the IGBTs and diodes which I measured look good. So I have still the assumption that the Y board is good. (But I'm not sure of anything anymore.)

But I can't understand why would exactly the same parts fail only because of missing screws? That is why I thought that maybe a faulty panel caused the same parts to break again?...

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hannesmen replied to 42PT353 ZSUS faulty or the panel???

in Troubleshooting TVs and Video Sources

03-23-2016, 06:20 AM
Re: 42PT353 ZSUS faulty or the panel???

Honestly, I have to say that I didn't have used one screw to fix it as I turned it on with the new Z board

Do you think this is the reason and probably the TV would work with a new Z board having all screws firmly tighten?

But somehow the same parts failed as those which are also faulty on the old Z board (which was always screwed before it failed)?

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Last edited by hannesmen; 03-23-2016, 06:34 AM.
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hannesmen replied to 42PT353 ZSUS faulty or the panel???

in Troubleshooting TVs and Video Sources

03-23-2016, 05:42 AM
Re: 42PT353 ZSUS faulty or the panel???

Thanks for your feedback men!

RD2004: I could find a lot of datasheets for RD2004JN, RD2004JS-SB or RD2004LN. But no one dedicated only to RD2004. I have attached pic of the part.

Unfortunately, I have don't have a oscilloscope. But can the CTRL board cause the ZSUS to break in a way that the igbt's get damaged?...

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hannesmen replied to 42PT353 ZSUS faulty or the panel???

in Troubleshooting TVs and Video Sources

03-23-2016, 03:44 AM
Re: 42PT353 ZSUS faulty or the panel???

Is it possible that shorts on a panel cause the zsus board to break? I found some faulty diodes and igbts (30F124) and the part RD2004 where I'm not sure if it is a diode or transistor. And this parts failed already a second time now?

Btw, I should mention that before the TV completely broke sometimes after I turned off the TV (when it should go to Stand-by) the image became somehow bright and the TV did not responded any more. I had to plug off the TV for some time until I could start it again.

Thanks for any...

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hannesmen replied to 42PT353 ZSUS faulty or the panel???

in Troubleshooting TVs and Video Sources

03-22-2016, 08:29 AM
Re: 42PT353 ZSUS faulty or the panel???

Well, with the first faulty Z board the image simply stayed black. After a few seconds I could hear a sort of a fizzling (not a clicking) and then the red light turned on again. Obviously, the TV recognizes a problem and starts the protection mode why the TV goes back into the stand-by mode.
I could locate the fizzling on the Z-sus board. I disassembled and found that it is faulty why I bought a new one.

I assembled the new Z board. For a second I could see a snowing image and they it became black again. Now the TV behaves...

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Last edited by hannesmen; 03-22-2016, 08:31 AM.
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hannesmen started a topic 42PT353 ZSUS faulty or the panel???

in Troubleshooting TVs and Video Sources

03-22-2016, 06:40 AM
42PT353 ZSUS faulty or the panel???

Hello Experts

I didn't want to open a new thread but unfortunately I got no feedback for my posts in an existing thread. Therefore I try to open its own thread and hope for some assistance.

I did already a lot of reading and testing and found a faulty ZSUS board.
I did also measure the YSUS board that is connected from the ZSUS board. Between Vs and Gnd I got a high resistance value why I thought the Y board should be ok.

I did order a ZSUS board and made an initial measurement to get sure the board is ok. Then I assembled the board and what...

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hannesmen replied to LG 42PT353 Z-sus fault

in Troubleshooting TVs and Video Sources

03-10-2016, 04:24 AM
Re: LG 42PT353 Z-sus fault

Hi experts,

does anyone has an input? I don't want to open a new thread as this one fits perfectly?

Regards
Hannesmen

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hannesmen replied to New Members - please post your introductions here

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03-07-2016, 04:16 AM
Re: New Members - please post your introductions here

Hello Gentlemen and Experts

I found this great forum. I have some basic electronics experience and I'm knowledge quite well with electrolytics.
Hope to find some helpful information from the experts. I look forward to interesting discussions.

Regards
Hannesmen

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hannesmen replied to LG 42PT353 Z-sus fault

in Troubleshooting TVs and Video Sources

03-07-2016, 03:48 AM
Re: LG 42PT353 Z-sus fault

Hi Folks

After reading many posts I'm some steps further.

After disconnecting the ZSUS board the TV seems to work again, of course without a picture. But I can turn on the TV and it is communicating with the remote control. And I can turn off the TV again.

I disassembled the board and measured the resistance between VS and GND and got readings between 2 and 5 ohms. I'm really sure but due to my understanding this means a short on the board???

As the YSUS bord is connected from the ZSUS I'm...

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hannesmen replied to LG 42PT353 Z-sus fault

in Troubleshooting TVs and Video Sources

03-04-2016, 04:14 AM
Re: LG 42PT353 Z-sus fault

Hello Gentlemen and Experts :-)

I found this great forum and hope that maybe some of the experts can give me a hint.

I have a similar problem. When I turn on the TV it begins to start. I can see it because the red light turn offs. After a few seconds I can hear a sort of a fizzling (not a clicking) and then the red light turns on again. Obviously the TV recognizes a problem and starts the protection mode why the TV goes back into the stand-by mode.

I could locate the fizzling on the Z-sus board. Could this fizzling...

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