Re: LG 37LC2D No picture, believe bad power supply
Hm theres not any BGAs components.
godzzila
Senior Member
Last Activity: 01-28-2025, 10:32 AM
Joined: 03-09-2013
Location: Jablonec nad Nisou
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Re: LG 37LC2D No picture, believe bad power supply
Problem was that TV was freezing on RGB input after some time... so it was working but freezing I think that because low 3,4V rail.. so the friend bring it to me but I had a problem with screen lines and no picture (because moisture)... and now TV not work on RGB or HDMI... -> NO SIGNAL
So may be ICs (or something else WHAT?) become damaged because low 3,4V rail?... If I inject 3,4V and got it stable nothing changed still no signal.Leave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
Yes its main video chip as well as drive audio too. So what could be bad? No RGB and no HDMI.Leave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
All works ok except RGB and HDMI... TV says NO SIGNAL on these inputs.
RGB go to VCT-IP directly and HDMI go to AD9381 and then to VCT-IP.
VCT-IP is a main one with small heatsink...
So how can I check VCT-IP if its bad?...Leave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
all 5 pin regulators and stabilizators work ok checked good acording to datasheetsLeave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
didnt test that ones yet.. which should i test first.. i think that I need search for datasheet on each for verifie?Leave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
yes tested all are okLeave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
[url]http://flattvparts.co.uk/bmz_cache/d/de46bebeb4bb000f504e803622978221.image.530x520.jpg[/url]
bigger [url]http://flattvparts.co.uk/bmz_cache/4/4050c40373c18e061d7c99807f6dfcd2.image.1000x982.jpg[/url]
i will do better laterRe: LG 37LC2D No picture, believe ba...x982.jpg[/url]Last edited by godzzila; 05-25-2013, 05:51 AM.Leave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
finaly have got screen working ok looks like there was some humidity that cause problem on screen (friend bring it to me in rainy day only TV in towel)
ok.. so I have picture and sound working ok, but the first problem is still there, HDMI, RGB (VGA) inputs are not working.. TV show no signal only.
scart and analog, and TV antenne works ok picture and sound....
With 3,4V injected and working ok no change still HDMI and RGB no signal.Leave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
So the injected external 3,4V it doesnt to be 100% ok? It looks stable and ok real 3,4V I tested with multimeter for proove.Leave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
ok thanks... but I still have to fix that lines problem.. so I will assembly whole tv and check LVDS signals on T-con.§
If I have sound ok but on screen half black and half lines its not related to low 3,4V rail even when i boost it with external power supply to 3,4V ok. So?Leave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
Anyone can help pleaseLeave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
So today I received controllers for 3,4V.. I replaced and NO CHANGE!!! Rail is still low 2,7V!! So thats not a problem with controller of that two mosfets!!
And another problem that lines I still have...
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Re: LG 37LC2D No picture, believe bad power supply
I have got some news.. after little play with remote control that friend bring me today i have sound working from external scart dvd player. So the problem really will be display or T-con isnt it?
Still have color lines on half display but sound works ok.Leave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
here it is...Leave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
yes I have itLeave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
so how can I test if t-con has good signals from motherboardLeave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
I tried power up TV firstly in my cool room.. around 12°C and nothing changed... Still half screen black, half screen colored vertical lines.Leave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
heh yeah I tried that... even heat whole board on my BGA machine nothing changed
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Re: LG 37LC2D No picture, believe bad power supply
my friend bring it to me... tv was freezing and sometimes suddenly go blackscreen etc.. he said that he replaced that 16V 1000uF cap (as was said here) that was bulging and then he said that TV was working fain... he let it play around 2 houres and then he said that was blackscreen again....
so he bring it to me I plug it power up and it show only that lines as i take photo... nothing else since that... so I found that +3,4V is low around +2,4V so I though that is the problem.... so I ordered new controller for that two mosfets......Leave a comment:
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