Hiya, folks.
I am in need of just a bit of help. I recently acquired a real nice Samsung LT27B350ND/ZA LED Monotor/TV that has a screen with a bit of "rastering".
Everything functions fine but the picture looks like it is blooming and makes the images too bright.
I have not had this apart yet and I want to see if others here have had a similar issue. You can see what I mean from the screen shots. In the interim I am going to pop the back off of this and check for anything obvious.
Thanx in advance!
Bud...
69sixpackbee
Member
Last Activity: 11-27-2021, 09:36 PM
Joined: 07-28-2014
Location: California
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Help With Screen Issue Samsung LT27B350ND/ZA
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Playing Videos From USB On LG 47LG50
Hi, folks!
I have my LG 47LG50 up and running and was wondering if these series' TV's are able to play movies from the USB stick?
I get it to recognize the files that are anything but a video format
Thanx!
Bud -
Re: Another Issue With LG 47LG50 Half Screen Distortion
Fixed it!
Reseated cables. -
Another Issue With LG 47LG50 Half Screen Distortion
I just thought that I had put this set to bed but another issue has reared its ugly head. I am getting yellow ghosting on the images of the left half of the screen and the border around any letterbox movie is dimly lit blue instead of blacked out.
I am thinking of swapping the ribbon cables on the T-con to see if it swaps sides. If it does then that is a no-brainer. If not, I will try the tab bonds next. Lastly, it must be the T-con I just put on. Is there something else possibly to look at?
Thanx,
Bud... -
Re: Need Some Repair Advice LG 47LG50
It's alive!!! Got the new T-con board and that was it. I had to replace the main board and the T-con both. Thanx again to all of the knowledgeable folks who lent a hand from this great forum!
BTW, I took a chance and got a replacement main board that although was for the exact same model set, the part number was slightly different and it works just fine my main board was an EAX42405502(5) and I put in one with the same # but with a suffix number (11) and it works just peachy.
For a $75.00 investment I've got a pretty...Leave a comment:
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Re: T-con Interchangeability LG 47LG50
Nice!!
Thanx, Guys!
Leave a comment:
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T-con Interchangeability LG 47LG50
Hi, folks,
The T-con board on my LG 47LG50 has a part # on the sticker of 35-D020223 and it is a V420H1-C07 part #silkscreened on the board itself.
There are many different TV manufacturers that use this V420H1-C07 board.
Are these interchangeable possibly?
Thanx,
Bud -
Re: Need Some Repair Advice LG 47LG50
That's what I thought.
Thanx!Leave a comment:
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T-Con Voltage Measurments
I took some reading off of the T-con with my DVD player that was playing a movie and I got the following readings in no particular order:
Gamma
1-9 ~.32V
10-16 .75V
17 .3V
18 0V
SDA 3.2 V
VIN 12.3 V
SCL 3.27 V
TST PGM 0 V
POL 1.62 V
ASTH .003 V
ATP1 .2 V
SIN2 1.63 V
A_STHR .001 V
B_STHR .006 V
VST .4 V
VGL -5 .56 V
VDD 3.2 V
VCOM 5.36V
VGH 17.49 V
VGHP 19.68 V
V33V 3.23 V
...Leave a comment:
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Firmware Update .epk Files For LG 47LG50 ?
I have looked hi and dry for any firmware for an LG 47LG50-UA and I cannot seem to locate any at all. Can someone help me to get the firmware for this TV?
Thanx,
Bud -
Re: Need Some Repair Advice LG 47LG50
Okay...
I attached the screen shots. I took some voltage readings on the header at the PSU that goes to the master inverter cable. I took two consecutive readings. One at 100% backlight and the other at 0%
100% readings:
BR1 = 1.739V
ON/OFF = 3.412V
PWM DIM = 5.09V
ERROR = 3.287V
and at 0%:
BR1 = 1.736V
ON/OFF = .847V
PWM DIM = 5.05V
ERROR = 3.285V
Interesting swing on the ON/OFF voltage
I got a board from...Last edited by 69sixpackbee; 08-19-2014, 02:42 PM.Leave a comment:
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Re: Need Some Repair Advice LG 47LG50
Okay, guys...here's an update on this PITA TV.
I got another main board and plugged it in and, Viola! everything came on. That's the good news...of course it has to be followed by the bad news, right?
The picture is so bright that I can barely see anything displayed on the screen. All of the remote functions work as do the side buttons. I can go through the menu functions and I can make adjustments. I went into the picture sub menu and set the backlighting all the way to zero and while the screen did dim quite...Leave a comment:
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Re: Need Some Repair Advice LG 47LG50
Update:
I pulled all of the CCFL's and they all test good.
Time to start throwing boards at this thing I guess. I'll start with the main board since this seems to be the origin of the initial problem.
Thanx again to all!
BudLeave a comment:
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Re: Need Some Repair Advice LG 47LG50
Okay, I did exactly as you said to the letter and still nothing. I used a new 3.2V button cell battery. Got a good 3.2V to the ON/OFF terminal and fired up the set. After it was good and booted I checked the voltages back at the header on the PSU. The only voltage I am getting now is just the 3.2 that was being fed by the battery. I shut it off, pulled the plug and took the battery off. Fired it up and it is devoid of ANY control voltages now. Just the +24 at the 5 pinouts along with the 5 GND. Now I guess something is awry within the main control...Leave a comment:
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Re: Need Some Repair Advice LG 47LG50
Hi, selldoor,
I can elaborate a bit further. I snipped the "ON/OFF" wire at the cable connector coming from the header on the PSU down to the master inverter board and I snipped the wire from the "ERROR" terminal as well to preven it from sending any erroneous shutdown signal back through (this was my thinking anyway). I pushed the on button and waited until the TV was fully booted (dimly glowing blue LED in the front panel) and the SMD mounted green status LED was illuminated solid on the main board. There was 24VDC...Leave a comment:
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Re: Need Some Repair Advice LG 47LG50
Didn't work. Nada, zip, caput. I tried tying both inverter board "ON/OFF" together and triggered them with a 3V source and with the ERROR lines clipped and not a peep. I then pulled the ribbon cables that connect the master and slave boards and tried it again. Same result. I pulled the ribbon cable from the T-con to the master inverter board....same result.
It should have done something I figured at this point. Not a damn thing! I have good +24 and GND's at each board.
Now I am just unsure at this point what is up. I...Leave a comment:
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Re: Need Some Repair Advice LG 47LG50
Cool!
I'm gonna try it then.
Thanx as usual, BudM!!...Leave a comment:
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Testing Inverter Function With External Triggering Supply?
I have a quick question that might help others with a "general" inquiry about inverters. I am trying to diagnose a possible inverter issue with this 47" LCD television and in the meantime I was thinking of temporarily cutting the BL_ON wire and supplying it with another external 3.3VDC source to see if the lamps illuminate briefly. I will also temporarily disconnect the ERROR line as well for the test. Is this okay?
Thanx,
BudLeave a comment:
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Re: Need Some Repair Advice LG 47LG50
Well then,
I think in the interim I am going to wait on that Chinese CCFL lamp tester I ordered today and then get back to it. Don't really want to rip the thing apart if I don't have to. If you have anything else you can add to this in the meantime please, by all means!
I did pull all of the lamp connectors from the inverter boards and tried firing it up. No difference. Do these inverters need some sort of continuity between the tubes to keep the error logic from happening?
I'll get back to this in a coupla weeks....Leave a comment:
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Re: Need Some Repair Advice LG 47LG50
Here is the panel that's in this TV:
It's a Chi-Mei panel. V470H1-L03
Thanx!
BudLeave a comment:
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