lg 42px5r no picture with sound

**tom66** · 02-19-2012, 05:39 PM

Re: lg 42px5r no picture with sound

Originally posted by nalle077

Yes I think so, it is not much but I think it is the same as the z-sus

I'm drawing a blank now. I think your buffers are dead, but I'm not sure. I'll see if anyone else has any input, I wish I could help more.

**nalle077** · 02-20-2012, 04:02 AM

Re: lg 42px5r no picture with sound

Originally posted by tom66

I'm drawing a blank now. I think your buffers are dead, but I'm not sure. I'll see if anyone else has any input, I wish I could help more.

I am grateful for all the help so far. I think it is strange that the fuse and some capacitors blew and it works with a New fuse. Could it be that the fuse blew due to the capacitor breakdown and some problems with the power occured than. But now that I have changed the capacitors the power is normal but something else (maby bufferboard) broke along the way ?

**nalle077** · 02-20-2012, 03:43 PM

Re: lg 42px5r no picture with sound

Are there anyone else who have a suggestion about this?

another strange thing is I found the service manual with the exact some modelnumber but in that it says I have y-sus board "6871QYH053B" 42”HD 42X3 VER.B, but I have Y-sus board "6871QYH051P" 42X2. Does anyone have a diagram for that board?

**cmj21973** · 02-20-2012, 07:57 PM

Re: lg 42px5r no picture with sound

Post an overall pic of all the boards connected.
Post front and back of Y-buffers, Y-SUS, Z-SUS

Here's what a burnt Y-buffer IC looks like

Attached Files

**nalle077** · 02-21-2012, 02:32 PM

Re: lg 42px5r no picture with sound

Originally posted by cmj21973

Post an overall pic of all the boards connected.
Post front and back of Y-buffers, Y-SUS, Z-SUS

Here's what a burnt Y-buffer IC looks like

Here are the photos, note that all buffer look the same as the buffer close up photo.

Attached Files

**cmj21973** · 02-21-2012, 06:25 PM

Re: lg 42px5r no picture with sound

Here is how to test Y-SUS IPM.

http://blog.coppelltvrepair.com/2011...s-ipm-for.html

**nalle077** · 02-22-2012, 11:27 AM

Re: lg 42px5r no picture with sound

Originally posted by cmj21973

Here is how to test Y-SUS IPM.

http://blog.coppelltvrepair.com/2011...s-ipm-for.html

Thanks.

I have measured according to the site and I found 1 thing that might be wrong. On my IPM (not the one on the picture I have 4921QP1027Q) there is no "ERout" I have "ER_I0", "ER_LOW", "ER_HIGH", "ER_DN" and "ER_UP" I have short between "ER_I0" and "SUS_OUT" and that is of course because I have it on the board ( if "ER_I0" and "ERout" is the same?) but I have 293 ohm between "+VS" and "ER_I0" if I have black probe on "+VS" and red probe on "ER_I0" the other way around I have almost Infinite.
What to think?
Does anyone have the same card and can see if it is the same on that?

**tom66** · 02-22-2012, 01:26 PM

Re: lg 42px5r no picture with sound

This may indicate a fault with the IPM. It certainly doesn't seem right.

I happen to have a 42PX5D, but I don't know if I'll be able to remove the board (as it's not really mine.)

**tom66** · 02-22-2012, 01:37 PM

Re: lg 42px5r no picture with sound

Just a thought: if you tell me where the IPM pins that are shorted connect to on the top side, I can check those. Like a big capacitor or something.

**nalle077** · 02-22-2012, 04:59 PM

Re: lg 42px5r no picture with sound

Originally posted by tom66

Just a thought: if you tell me where the IPM pins that are shorted connect to on the top side, I can check those. Like a big capacitor or something.

Ok nice, test black probe on fuse FS152 an red probe on one of the little (What are those) FL22 or any of those sitting to the right just below the big heatsink directly over the 2 capacitors C99 and C100.

by the way, also test black probe on same fuse and red probe on ground and see what you get there.

best regards

**nalle077** · 02-25-2012, 02:10 AM

Re: lg 42px5r no picture with sound

Originally posted by nalle077

Ok nice, test black probe on fuse FS152 an red probe on one of the little (What are those) FL22 or any of those sitting to the right just below the big heatsink directly over the 2 capacitors C99 and C100.

by the way, also test black probe on same fuse and red probe on ground and see what you get there.

best regards

Have you had the time to test this yet? Maby anyone else has the same board and can test this.
I have board "6871QYH051P"

**tom66** · 02-25-2012, 04:12 AM

Re: lg 42px5r no picture with sound

Originally posted by nalle077

Ok nice, test black probe on fuse FS152 an red probe on one of the little (What are those) FL22 or any of those sitting to the right just below the big heatsink directly over the 2 capacitors C99 and C100.

by the way, also test black probe on same fuse and red probe on ground and see what you get there.

best regards

Sorry, I won't be able to get to it for a couple of days. I should be able to test it Monday. (It's in the office.) I'll report back then... PM me if I forget (I tend to forget important things!)

**tom66** · 02-26-2012, 06:52 AM

Re: lg 42px5r no picture with sound

Okay, I've got access to the TV today to fix the Y-sustain timings. Here's the read outs you requested (from a TV that works reasonably well):

Fuse to FL22: Around 7.5 meg-ohms
Fuse to GND: Around 5 meg-ohms

So it would seem your board has a problem if you are getting hundred ohm readouts.

**nalle077** · 02-27-2012, 12:25 PM

Re: lg 42px5r no picture with sound

Originally posted by tom66

Okay, I've got access to the TV today to fix the Y-sustain timings. Here's the read outs you requested (from a TV that works reasonably well):

Fuse to FL22: Around 7.5 meg-ohms
Fuse to GND: Around 5 meg-ohms

So it would seem your board has a problem if you are getting hundred ohm readouts.

Ok great then I atleast know that it is a fault, you have the same board right?

I have some solderskills so I think I will try to change it myself, I have read the post in other threads and I belive I will be able to fix it.

**tom66** · 02-27-2012, 12:32 PM

Re: lg 42px5r no picture with sound

Originally posted by nalle077

Ok great then I atleast know that it is a fault, you have the same board right?

I have some solderskills so I think I will try to change it myself, I have read the post in other threads and I belive I will be able to fix it.

I think I have the same board. I had no difficulty finding the components in the places you specified.

I'll try and check the model # tomorrow.

**nalle077** · 02-28-2012, 01:31 PM

Re: lg 42px5r no picture with sound

Originally posted by tom66

I think I have the same board. I had no difficulty finding the components in the places you specified.

I'll try and check the model # tomorrow.

Did you have a chance to check the board today?

You did measure with the probes the way I discribed right ( black probe on fuse) ?

best regards

**tom66** · 02-28-2012, 01:56 PM

Re: lg 42px5r no picture with sound

Originally posted by nalle077

Did you have a chance to check the board today?

You did measure with the probes the way I discribed right ( black probe on fuse) ?

best regards

Agh! I forgot. Sorry, I'll check tomorrow, I think I'm in the office tomorrow.

**nalle077** · 02-29-2012, 11:58 AM

Re: lg 42px5r no picture with sound

Originally posted by tom66

Agh! I forgot. Sorry, I'll check tomorrow, I think I'm in the office tomorrow.

Any luck with the memory today

**tom66** · 02-29-2012, 12:13 PM

Re: lg 42px5r no picture with sound

6870QYH002P

for PDP: 42X2A

**nalle077** · 02-29-2012, 02:00 PM

Re: lg 42px5r no picture with sound

Originally posted by tom66

6870QYH002P

for PDP: 42X2A

Yes that is the same board, I read on the little sticker on I have on my board, but I saw that 6870QYH002P was printed directly on the board

But you did the measuring withe the black probe on the fuse right ?

lg 42px5r no picture with sound

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