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Old 05-30-2017, 04:53 PM   #1
nalle077
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Default LG 50pc1r-zh Flickering

Hello experts
I have a LG 50pc1r-zh which is flickering when turn on.
I replaced 9 3300mf capacitors and 1 1000mf capacitor.
I did not try it befor I changed them as I got it from a friend and I knew it did not work.
Anyway It turns on and I hear clicking sound and the screen is flickering.
It is exactly the same as this video
https://www.youtube.com/watch?v=LJochQbgncQ
I saw that he also wrote that he replaced capacitors and had the same issue afterwards.
He did not write back if he fixed it or not.
It seems to be the ysus board, but how can I be sure? and is not the ysus board fixable? what goes bad with it?
I want to know for sure when I change things and I want to know what is bad so that I learn something to
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Old 05-31-2017, 04:47 AM   #2
mmartell
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Default Re: LG 50pc1r-zh Flickering

IPM failure most likely.
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Old 05-31-2017, 08:48 AM   #3
nalle077
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Default Re: LG 50pc1r-zh Flickering

Quote:
Originally Posted by mmartell View Post
IPM failure most likely.
How to diagnose it?
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Old 05-31-2017, 02:31 PM   #4
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Default Re: LG 50pc1r-zh Flickering

Is the ysus making a ticking noise?
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Old 05-31-2017, 03:44 PM   #5
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Default Re: LG 50pc1r-zh Flickering

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Is the ysus making a ticking noise?
Yes it does.
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Old 05-31-2017, 05:02 PM   #6
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Default Re: LG 50pc1r-zh Flickering

Flip the ysus upsidedown.
The pin in outs are labelled. But your black probe on the pin marked Gnd. And test the outputs. Sus out etc. See if any are shorted.

Either way that ticking noise is usually the sign that one has failed.
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Old 06-01-2017, 03:36 PM   #7
nalle077
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Default Re: LG 50pc1r-zh Flickering

Quote:
Originally Posted by Hamie View Post
Flip the ysus upsidedown.
The pin in outs are labelled. But your black probe on the pin marked Gnd. And test the outputs. Sus out etc. See if any are shorted.

Either way that ticking noise is usually the sign that one has failed.
On IC201 there is no shorts.
On IC202 there is short between gnd and NC
also between gnd and all pinblock named CH
Attached Images
File Type: jpg IC201.jpg (646.3 KB, 15 views)
File Type: jpg IC202.jpg (555.6 KB, 18 views)
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Old 06-02-2017, 03:28 PM   #8
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Default Re: LG 50pc1r-zh Flickering

Up>
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Old 06-04-2017, 04:23 PM   #9
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Default Re: LG 50pc1r-zh Flickering

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Originally Posted by nalle077 View Post
Up>
up
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Old 06-05-2017, 04:46 PM   #10
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Default Re: LG 50pc1r-zh Flickering

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Originally Posted by nalle077 View Post
up
Anyone with an answer? Is both the IPM on ysus the same? I have read that you should change both to get the same revision
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Old 06-05-2017, 06:46 PM   #11
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Default Re: LG 50pc1r-zh Flickering

all ipm's are the same on x and y boards.
unfortunately i don't have any here with that pin out to get comparative readings for you.
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Old 06-06-2017, 05:04 PM   #12
nalle077
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Default Re: LG 50pc1r-zh Flickering

Quote:
Originally Posted by attainteddragon View Post
all ipm's are the same on x and y boards.
unfortunately i don't have any here with that pin out to get comparative readings for you.
I bought 2 of them now, so I will change both of the Ysus IPM.
Wish me luck
I will get back with the result when I have reseived and changed them.
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Old 06-06-2017, 06:15 PM   #13
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Default Re: LG 50pc1r-zh Flickering

you could of compared the ipm's from the y to the x board. hope it fixes your set though.
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Old 06-07-2017, 12:39 PM   #14
nalle077
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Default Re: LG 50pc1r-zh Flickering

Quote:
Originally Posted by attainteddragon View Post
you could of compared the ipm's from the y to the x board. hope it fixes your set though.
I do not understand this? Please explain. I bought both IPM for ysus board. Ysus IPM and ER IPM. I read that you should change both IPM so that they have the Sam revision. And they were not expansive.
And I read that it is an easy job
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Old 06-07-2017, 01:14 PM   #15
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Default Re: LG 50pc1r-zh Flickering

"Easy job" with the right tools! I use a Hakko 808 desoldering gun and still have difficulty removing them at times. The Ysus are multi-layered boards that disperse heat as well as the IPM's heatsink.

I usually add leaded solder to the IPM's pins, then heat up the bottom (pin side) with a heat gun, and then use the Hakko to suck out the solder from the pins.
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Old 06-07-2017, 04:53 PM   #16
nalle077
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Default Re: LG 50pc1r-zh Flickering

Quote:
Originally Posted by cliff_hootarski View Post
"Easy job" with the right tools! I use a Hakko 808 desoldering gun and still have difficulty removing them at times. The Ysus are multi-layered boards that disperse heat as well as the IPM's heatsink.

I usually add leaded solder to the IPM's pins, then heat up the bottom (pin side) with a heat gun, and then use the Hakko to suck out the solder from the pins.
That was why it was a whisteling smiley.
I know it is a hard job . I have done it ones before and that tv did not work after I did it, but I think something else was wrong with it.
I think I will try to cut the pins with some small tool
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Old 08-08-2017, 11:02 AM   #17
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Default Re: LG 50pc1r-zh Flickering

Hello again. Desoldering is done. But here comes maby a stupid question. Is the er-ipm the same as the sus-ipm? Because I desoldered both of them thinking that it should change both of the as I have read you should change both Ipm the same time. Now I believe that this ment the ysus and zsus ipm. Should I solder the er-ipm again?

Last edited by nalle077; 08-08-2017 at 11:11 AM..
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Old 08-09-2017, 03:07 AM   #18
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Default Re: LG 50pc1r-zh Flickering

Quote:
Originally Posted by nalle077 View Post
hello again. Desoldering is done. But here comes maby a stupid question. Is the er-ipm the same as the sus-ipm? Because i desoldered both of them thinking that it should change both of the as i have read you should change both ipm the same time. Now i believe that this ment the ysus and zsus ipm. Should i solder the er-ipm again?
up
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Old 08-09-2017, 01:51 PM   #19
nalle077
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Default Re: LG 50pc1r-zh Flickering

Quote:
Originally Posted by nalle077 View Post
up
Anyone with an answer?
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Old 08-09-2017, 05:47 PM   #20
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Default Re: LG 50pc1r-zh Flickering

No expert but I believe the x and y are the same and should both be changed. Check part numbers
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