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Can a TV repair technician fix a dead pixel and backlight bleed?

post #1 of 9
Thread Starter 
Hi guys,

I bought an LG 42LN5300, and this TV has some bad backlight uniformity and a dead pixel. I'm out of the return period from the store I bought it from, but still in warranty. So I contacted LG, thinking they would ship me a shipping box to send it to their factory. Instead they made an appointment for a technician from a local electronics repair company to come to my house and fix it. I guess that does make more sense cost wise. But since they'll most likely have to replace the panel, would this technician have the exact panel type and size my TV uses? This is my first experience dealing with a TV repair technician coming to my house, so I'm not sure, the LG rep didn't know, and the repair store is now closed. I'd imagine they'd have to, or else they can't fix it! But it is a very specific part, and I don't want them replacing it out with another panel that isn't the same quality as my IPS!

My post may sound a little ignorant, so hope someone has had a similar experience and can chime in. Thanks!
post #2 of 9
I highly doubt it. Both the backlight and the transmissive "stained glass" panel for the LCD are self contained in a single panel unit. You would need a clean room as well as specialized equipment to the extreme in order to fix the panel itself.

IF the technician can order a new panel and just drop it in as a replacement, then yes. But, that depends on the technician, the panel, and other logistics.

EDIT: Just reread it again for clarity. You will probably have to ask the technician or the company doing the repairs and double check the model number of the panel you have and the one they are dropping in there.
post #3 of 9
Thread Starter 
Quote:
Originally Posted by Avexrion View Post

I highly doubt it. Both the backlight and the transmissive "stained glass" panel for the LCD are self contained in a single panel unit. You would need a clean room as well as specialized equipment to the extreme in order to fix the panel itself.

IF the technician can order a new panel and just drop it in as a replacement, then yes. But, that depends on the technician, the panel, and other logistics.

EDIT: Just reread it again for clarity. You will probably have to ask the technician or the company doing the repairs and double check the model number of the panel you have and the one they are dropping in there.

That's what I thought, I doubted it too. Actually I was wrong when I said it was IPS. Got myself confused. I did some digging around months ago and found out that my TV has a panel lottery; it either comes with an S-IPS panel made by LG or an A-MVA panel made by AUO. Unfortunately my panel is the A-MVA one. You can tell by the service code on the box. But this is a perfect opportunity. If I can find the S-IPS panel name is it possible for them to order that and put it in the TV, since the TV is compatible with either it seems? Since I am not paying for this (it is covered under LG warranty) I wonder if I'll be able to do this, since the service code on the sticker matches the A-MVA one but then I'd have an S-IPS panel.
post #4 of 9
Quote:
Originally Posted by apav View Post

That's what I thought, I doubted it too. Actually I was wrong when I said it was IPS. Got myself confused. I did some digging around months ago and found out that my TV has a panel lottery; it either comes with an S-IPS panel made by LG or an A-MVA panel made by AUO. Unfortunately my panel is the A-MVA one. You can tell by the service code on the box. But this is a perfect opportunity. If I can find the S-IPS panel name is it possible for them to order that and put it in the TV, since the TV is compatible with either it seems? Since I am not paying for this (it is covered under LG warranty) I wonder if I'll be able to do this, since the service code on the sticker matches the A-MVA one but then I'd have an S-IPS panel.

Sadly I've never used a technician to replace my panels so I can't speak from experience. BUT, I would assume you could at least talk them into it (or perhaps even find a better panel than either the S-IPS or A-MVA which is compatible which you can make them order). Panelook has a great database for that.

Really, in your case, you'll just have to ask. The sheer fact that you know the difference between the panel and the TV itself should at least make them listen. I'm sure they'll be willing to work with an educated customer (aka a picky one that checks behind their work).

They shouldn't have too much of an issue since LG Warranty picks up the cost and it just comes down to them tracking down the right panel.
post #5 of 9
Thread Starter 
Quote:
Originally Posted by Avexrion View Post

Sadly I've never used a technician to replace my panels so I can't speak from experience. BUT, I would assume you could at least talk them into it (or perhaps even find a better panel than either the S-IPS or A-MVA which is compatible which you can make them order). Panelook has a great database for that.

Really, in your case, you'll just have to ask. The sheer fact that you know the difference between the panel and the TV itself should at least make them listen. I'm sure they'll be willing to work with an educated customer (aka a picky one that checks behind their work).

They shouldn't have too much of an issue since LG Warranty picks up the cost and it just comes down to them tracking down the right panel.

Thanks, I've heard of panelook before, but sadly I can't really narrow down the search besides this:
http://www.panelook.com/modelsearch.php?order=panel_id&by=desc&production_state=1&brand_family=LGD&panel_size_inch=42&resolution_pixels=19201080&production_state=-1

I'm no expert, I know it's Direct LED, S-IPS, 1080p and 42" but I don't really know any of the abbreviated terms in the search bars (maybe if they weren't abbreviated I would be able to tell).

How else would you know what panels are compatible with the TV? I don't know what panels would be better than an LG made S-IPS, I just know that IPS beats VA in almost every way besides blacks. Wouldn't LG care if you put another panel in the TV it wasn't originally designed with? They are paying for it after all, and I thought the technician's company would be ordering the replacement panel from LG.

Thanks for the help, I'm just trying to understand the process so I know what to say to them. smile.gif
Edited by apav - 2/26/14 at 3:09pm
post #6 of 9
Quote:
Originally Posted by apav View Post

Thanks, I've heard of panelook before, but sadly I can't really narrow down the search besides this:
http://www.panelook.com/modelsearch.php?order=panel_id&by=desc&production_state=1&brand_family=LGD&panel_size_inch=42&resolution_pixels=19201080&production_state=-1

I'm no expert, I know it's Direct LED, S-IPS, 1080p and 42" but I don't really know any of the abbreviated terms in the search bars (maybe if they weren't abbreviated I would be able to tell).

How else would you know what panels are compatible with the TV? I don't know what panels would be better than an LG made S-IPS, I just know that IPS beats VA in almost every way besides blacks. Wouldn't LG care if you put another panel in the TV it wasn't originally designed with? They are paying for it after all, and I thought the technician's company would be ordering the replacement panel from LG.

Thanks for the help, I'm just trying to understand the process so I know what to say to them. smile.gif

Well, that's where it gets tricky. If you can, you can try to find the datasheet on yours and make note on the data/lighting connections and try to find another, better panel with the same connections/voltages and connector positions. You are probably better off though asking for the stock IPS panel which usually comes with the TV.
post #7 of 9
Thread Starter 
Quote:
Originally Posted by Avexrion View Post

Well, that's where it gets tricky. If you can, you can try to find the datasheet on yours and make note on the data/lighting connections and try to find another, better panel with the same connections/voltages and connector positions. You are probably better off though asking for the stock IPS panel which usually comes with the TV.

I'd rather play it safe since I don't know what I'm doing tongue.gif As for finding the S-IPS panel this TV uses, I was just randomly clicking links and I came across this page:
http://avnetexpress.avnet.com/store/em/EMController/_/N-4294609491?action=products&storeId=500201&langId=-1&sel=M

Searched the page for "42" and I got 4 entries, but they were the same panel just repeated. LD420DUE-SFR1 and LD420EUB-SDA1. That's the closest I've gotten to finding the name of the panel, but I'm not sure if it is actually one or either of these.

Using the specifications from those panels, I narrowed the search down to this:
http://www.panelook.com/modelsearch.php?pagesize=50&order=panel_id&panel_type=a-TFT&product_composition=LCM&brand_family=LGD&panel_size_inch=42&resolution_pixels=19201080&brightness=400&gray_depth=8&viewing_angle_function=&lamp_type=WLED&signal_type_category=LVDS&rohs_compliance=&button=Search

Also I just had a thought. Wouldn't it be more likely if the repair technician they'll just tell LG that they can't, so LG will want me to ship it to them? In that case, they'll replace the panel with the same exact one that's in there, and I doubt they'll swap it with the S-IPS panel if I ask them too. So I'll be sure to call the repair place tomorrow and ask them what happens if they can't fix the TV, and if they can order the part for me.
Edited by apav - 2/26/14 at 3:49pm
post #8 of 9
Thread Starter 
Here's an update. The technician called, and I explained to him what the problem is. He then told me they're not going to come because obviously they can't fix it without replacing the panel, as expected. Surprisingly though, he wanted to get the information of the TV and some pictures of the defects so he can order a new panel. So, I'm about to email him and include the service code of the S-IPS panel (not the one I have), but I just need to make sure of two things before I do:

1.) I did a lot of research to confirm that it comes in two panel types. If this TV can be found with either an A-MVA or S-IPS panel, does that mean it's compatible with either? I should ask this question in a more broader sense. A lot of TV's have a panel lottery, but usually are those TV's compatible with all of the panels in their lottery, or is there a difference in the actual TV itself besides the panel?

2.) S-IPS is overall more superior to A-MVA correct? I also did a lot of research, but I read a post earlier of something stating that MVA has improved so much that it's superior now. But from the information I gathered, IPS (particularly S-IPS) is just all around better (colors, viewing angles, and response time) except for blacks and the IPS glow.

Appreciate the input!
Edited by apav - 2/27/14 at 1:14pm
post #9 of 9
The sheer fact that you know the difference between the panel and the TV itself should at least make them listen SShln1
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