Re: LG 42LB650V Screen dark
Thanks for the replies friends. Too much for me. Don't know the cost to repair in the UK.
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Re: LG 42LB650V Screen dark
I have the following pics. Thanks for your help[ATTACH]237793[/ATTACH]
[ATTACH]237794[/ATTACH]
[ATTACH]237795[/ATTACH]
[ATTACH]237796[/ATTACH]Re: LG 42LB650V Screen dark
I have the following pics. Thanks for your help[ATTACH]237793[/ATTACH]
[ATTACH]237794[/ATTACH]
[ATTACH]237795[/ATTACH]
[ATTACH]237796[/ATTACH]Re: LG 42LB650V Screen dark
I have the following pics. Thanks for your help[ATTACH]237793[/ATTACH]
[ATTACH]237794[/ATTACH]...
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LG 42LB650V Screen dark
Hi I have a LG42LB650V 3d tv around 5 years old. The picture now is darker from the top right corner 2/3 across the screen. It is watchable but infuriating. I have tried every setting in the book, dismantled and cleaned the ribbon cables on the main board to no avail. Any help very much appreciated....
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Re: LG 42LC46-ZC picture off sound ok
Solved and TV working again. Finished up buying a replacement Main Board for £30. Could not pinpoint the problem with the original. Thanks for all the help from the people on this site. I'll be back I'm sure.
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Re: LG 42LC46-ZC picture off sound ok
On tips picked up from this site I nicked my wife's hair drier and a cooling fan. It seems to be the main board that is the problem. Using the hair dryer technique on the main board the picture goes off after three minutes. Putting the cooling fan on the picture returns after 20 seconds. Now i haven't been around the PSU board with the fans and as I have changed this board before I can safely rule it out.
Now on the main board I can only see one large capacitor and it is around this area I put the hair drier. Could this be the...
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Re: LG 42LC46-ZC picture off sound ok
Thanks for all your help Vinceroger. Will get to the bottom of it one day.
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Re: LG 42LC46-ZC picture off sound ok
Thanks Vinceroger. Tried the test as you suggest. Around that area I only get voltage on the vgl which is 6.01v. The other two read as 1. It has to be something else as I have tried another T-Con board today. Could there be a loose joint to the CCFL tubes.
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Re: LG 42LC46-ZC picture off sound ok
Thanks for the replies. Then chip details are:- LG Philips LCD, R8RD 1028 FP, 01H1L - D068A, 705108
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Re: LG 42LC46-ZC picture off sound ok
Ok. Voltage on T-Con Fuse. TV working OK. 12v one side and 12.01v the other. TV picture off and sound Ok. 12v one side 11.98 the other. Yes only the picture goes and the backlight is on.Last edited by Jimbo555; 10-27-2015, 11:10 AM.
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Re: LG 42LC46-ZC picture off sound ok
Great I see that but where do I put the negative.
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Re: LG 42LC46-ZC picture off sound ok
Sorry Vinceroger can't see a fuse on the T-Con board. See pic in post 12.
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Re: LG 42LC46-ZC picture off sound ok
More readings:
13 pin connector PSU to main board Voltage readings.
Picture fine - Picture off/sound ok. Backlight still on
3.4V 3.43 - 3.43
ON
GND
6.5V 6.34 - 6.34
A-DIM 3.4 - 3.25
GND
ST5V 4.84 - 4.84
BURST
-DIM 3.27 - 3.28
ERR
INY 4.69 - 4.69
CTR 3.01 - 3.00
GND
ST5V 4.84 - 4.84
ON/OFF 2.74 - 2.75
ACD 4.92 - 4.93Last edited by Jimbo555; 10-27-2015, 08:57 AM.
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Re: LG 42LC46-ZC picture off sound ok
13 pin connector PSU to main board Voltage readings.
Picture fine Picture off/sound ok. Backlight still on
3.4V 3.43 3.43
ON
GND
6.5V 6.34 6.34
A-DIM 3.4 3.25
GND
ST5V 4.84 4.84
BURST
-DIM 3.27 3.28
ERR
INY 4.69 4.69
CTR 3.01 3.00
GND
ST5V 4.84 4.84
ON/OFF 2.74 2.75
ACD 4.92 4.93
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Re: LG 42LC46-ZC picture off sound ok
No but I will tomorrow.
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Re: LG 42LC46-ZC picture off sound ok
Anyone any ideas with these readings. Thanks
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Re: LG 42LC46-ZC picture off sound ok
Voltage readings from two connectors from PSU boardm to Main board.
10 pin connector PSU to main board Voltage readings.
Picture fine Picture off/sound ok Backlight still on
GND
12V 12.12 and 12.09
GND
3.4V 3.42 and 3.41
GND
6.5V 6.34 and 6.34
19V 19.24 and 19.24
13 pin connector PSU to main board Voltage readings.
Picture fine Picture off/sound ok. Backlight still on
3.4V 3.43 and 3.43...Last edited by Jimbo555; 10-18-2015, 10:23 AM.
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Re: LG 42LC46-ZC picture off sound ok
Got some voltage readings. Attached pdf file. Thanks hope someone helps....
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Re: LG 42LC46-ZC picture off sound ok
Sorry been working a few days. Back to the tv now. On further investigation the back light stays on when the picture goes and sound is ok. Hope the pics are ok and someone can point me to where to check the voltages. Last pic is the connector from the PSU to the main board. Thanks for any help...
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Re: LG 42LC46-ZC picture off sound ok
Will post more pics on Mon afternoon but here's the PSU board. As for volt readings I've a little more to learn yet. Thanks for everyone's help...
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Re: LG 42LC46-ZC picture off sound ok
If I turn it off after the picture goes and back on after two or three minutes it is perfect again for a couple of minutes.
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