Re: LG 55LB6500 - Dim Logo - Getting Ready for New Backlights
I appreciate that.
My thought was investigating compatible new strips, and not getting hung up on delivery times.
The way these guys have been failing, I don't feel like playing the risk with pre-owned.
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From my other work I have a fairly complete line of solvents. I'll start out with the light stuff and move up the column.
Renovator
Member
Last Activity: 03-24-2024, 04:10 PM
Joined: 06-17-2019
Location: League City, Texas
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LG 55LB6500 - Dim Logo - Getting Ready for New Backlights
From my reading, this LG looks like so manty others, with the slightly visible logo at power on.
I'm pretty sure the metal back is coming off so I can replace ailing backlights.
I thought I'd go ahead and post up, since this model didn't search here.
Here's the 20 pin voltages:
GND
11.8
11.8
GND
23.8
GND
3.4
3.4
3.3
Evens
GND
23.9
11.8
23.9
2
3.4
2
3.3
The big cap is 395 VDC.
There... -
Re: Samsung UN55E7100F Tcon Fuses
Woot Woot.
Third board's a charm.
The latest board showed a smooth set of gamma points and the picture looks very nice.
(I do have a 'clouding' issue, that may well be a crushed diffusion stack. I'll do the brussel sprout trick after It's warmed up.)
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I tried to freeze the last boards procs, but didn't see any volts change. With those sinks, and their less than stellar adhesive interface, you may need plenty more spray than I would throw at a proof of concept.
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...Leave a comment:
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Re: Samsung UN55ES550F Tcon Fuses
Hmmpf,
Another freeze spray application. (Half joking, I was considering using it on a 20 year old lawn mower starter troubleshoot this morning, but a bag of ice is just as handy for those.)
Point noted.
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Lord Knows I could be off base here, but I can't find a familiar looking IC like a AS19.
I think the traces run under that sink or both, and they are what may be, probably are, BGA packages. I'm not there yet, skillfully.
But that doesn't mean we shouldn't try...Leave a comment:
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Re: Samsung UN55ES7100F Tcon Fuses
Lovely:
VGMA 1 16.3
VGMA 2 13.8
VGMA 3 13.0
VGMA 4 12.5
VGMA 5 12.0
VGMA 6 11.6
VGMA 7 11.3
VGMA 8 11.0
VGMA 9 9.0
VGMA10 7.9
VGMA11 5.2
VGMA12 3.9
VGMA13 5.9
VGMA14 4.9
VGMA15 3.0
VGMA16 5.6
VGMA17 4.9
VGMA18 0.5
(When I get a better gamma curve from a future board I'll let you know.)Leave a comment:
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Re: Samsung UN55ES7100F Tcon Fuses
I decided to wander out further on the diminishing return limb, and obtained another Tcon, with heatsink seated.
It made a significant change, but there is more to be done.
The boot screen with 'Smart TV' has always been fine and still is.
Now, the OSD menus are also displayed properly. (Previously they also showed the dark posterization.)
Now I have what more nearly looks like other solarization examples about the net. (These seem less to moderate in intensity.)
It is not...Leave a comment:
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Re: Samsung Plasma PS60E530 no image, slow blinking green led
I'm always here asking for advice, so realize with my post count I may only be giving you a bump.
That aside, you'll see different examples of fixing similar problems, but maybe not with this specifc Y main.
You may want to try and get better resolution shots, so the component ID's can be seen.
Otherwise it goes like this:
On your Y main, there is a Yellow wrapped transformer coil. Not far away is the Vscan pot.
I have had a very similar issue...Last edited by Renovator; 10-01-2019, 04:30 PM.Leave a comment:
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Re: Samsung UN55ES550F Tcon Fuses
I was wondering where you were going.
That's very thoughtful.
And I was looking for an acknowledgment that we are now in wonky processor land and give it a rest.
I've had that one in a cart, their ship starts at 14 dollars.
As you probably saw in your board search, darn near all pix show a skewed black flat aluminum heatsink on the proc nearest the test points.
That's not unusual maquiladora hand work. Could be anywhere, but that and the uninstalled other heatsink, means...Leave a comment:
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Re: Samsung UN55ES7100F Tcon Fuses
I never caught that typo.
I am absolutely sure it is not a 550. Looks like I stuck a sister search string in the title.
It's a ES7100.
UN55ES7100F.
(This Tcon is associated a lot with the 46.)
Nice Catch... Thank You...Leave a comment:
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Re: Samsung UN55ES550F Tcon Fuses
The list:
VGMA 1 11.26
VGMA 2 9.53
VGMA 3 8.96
VGMA 4 8.55
VGMA 5 8.28
VGMA 6 7.99
VGMA 7 7.78
VGMA 8 7.58
VGMA 9 6.23
VGMA10 5.43
VGMA11 3.63
VGMA12 2.66
VGMA13 [COLOR="DarkRed"]4.05[/COLOR]
VGMA14 3.35
VGMA15 2.09
VGMA16 [COLOR="DarkRed"]3.85
[/COLOR]VGMA17 3.04
VGMA18 0.37
There was no input connected, so it auto shutdown during...Last edited by Renovator; 09-28-2019, 04:48 PM.Leave a comment:
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Re: Samsung UN55ES550F Tcon Fuses
Thanx.
I'm on it.Leave a comment:
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Re: Samsung UN55ES550F Tcon Fuses
Oh well.
The panel has some 'clouding' in both lower quadrants. it's pretty irregular shapes, but you can see the pixel intensity differences, so that's that.
This image quality thing is consistent on all the screen real estate.
There is a bunch of information missing. That's as bright as it gets. And looks better in the photo.
Everything is seems posterized, and looks like whole areas of the color gamut are just gone or real weak.
I'm just begging the question for info purposes, what...Last edited by Renovator; 09-27-2019, 02:48 PM.Leave a comment:
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Re: Samsung UN55ES550F Tcon Fuses
Boys... and ladies, I believe we are [B]fixed[/B].
Or at least the big pieces. I have no input signal, or specific remote, and I don't have a support frame, so I just slide a few inches off the edge to peak, but the snow looks damn good..
(Yeah checking a Kuro that way is tricky. It's all black.)
So, what I did.
I replaced the shorted CO46 with the one that seemed right or close from the parts house.
I replaced CO45 to it's original pre-test pads.
I fashioned...Last edited by Renovator; 09-27-2019, 12:07 PM.Leave a comment:
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Re: Samsung UN55ES550F Tcon Fuses
Rodger that.
I was on a manufacturer's site trying to understand sizing and I saw all the installation and handling recommends... including no metal tweezers.
Then when I removed the mlcc it stuck to my tweezers like that resistor did.
Anyway, I have a better strategy going forward. And a half dozen 47 picofarad JIC.
Leave a comment:
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Re: Samsung UN55ES550F Tcon Fuses
budm,
I did make it to the parts supply. I came to that conclusion after visiting with a fellow there.
While they didn't have smd's that size, there were conventional resistors at 0 or .11 or 1 ohm.
His comment was, something about treating it like a fuse.
Now, if that is probable, and they had a reason for placement, do I need to look harder at the readings I have at RD106 and RD108 ?
They sure seem to be open to me. I can't get a reading on any of the three meters.
At...Last edited by Renovator; 09-26-2019, 08:05 PM.Leave a comment:
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Re: Samsung UN55ES550F Tcon Fuses
I omitted the label, sorry.
RD10 and also RD25 (this side of DD1) are both reading about the same as each meter's short output : 0.2 or 0.1 ohm.
With either style meter, ranging or 200 ohm.
Quickly after probe contact they are about an ohm, then steady drop if I stay pressed.Leave a comment:
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Re: Samsung UN55ES550F Tcon Fuses
I'm going to try to get some resistors and replacement cap today.
I looked at other small small resistors in the immediate area to RD03:
I used three meters, and they all reported that the resistance was just about what they each would read if I held both probe tips together. About 0.2 ohm or 0.1 ohm going to zero if I held it.
The resistor over at RD121 is showing 100 Ohms consistently.
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I didn't look closely at the trace but that pair of itty bitty ones RD106/108 I...Leave a comment:
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Re: Samsung UN55ES550F Tcon Fuses
I'm adding the better resolution Tcon photo to complete the record.
It also shows the CO46 removed and the processor w/o heatsink.
Those little spots are the only bit of heatsink adhesive from where the minor contact occurred.
From the side elevation you could clearly see a half mm air gap between the plate and the processor.
Essentially, it was a thermal umbrella, with a bit of sympathetic convection of the air gap.
The underside of the sink shows the goo in near pristine...Leave a comment:
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Re: Samsung UN55ES550F Tcon Fuses
Great. I'll need to chase down a wee resistor to finish the rest of the reconnect on this board.
That's my RD03 issue.
In passing, is something like Artic Silver or an Antec paste suitable for reinstalling, well actually installing, the bigger proc's heatsink on the Tcon?
This heatsink was never in contact with the processor. The adhesive in the sink has only a teenie spot were there was less than casual contact.
It's just a bad match between the standoffs and the pushpins.
...Leave a comment:
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Re: Samsung UN55ES550F Tcon Fuses
Sorry. There is an error in Post 21
It was/is CO4[B]6[/B].
I was heating CO45/46 and I moved and then removed [B]CO46[/B].
Now all the larger tan caps and all the previous points tested on that line are now at 2.76 kOhm.
I just tried the resistance across the removed tan cap and after it raises through a transient, it then steady's down to 0.5 Ohm.
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Yes on the pix, my best bet is with natural light; so it'll be several hours.Re: Samsung UN55ES550FLast edited by Renovator; 09-24-2019, 10:04 PM.Leave a comment:
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