LG 37LC7D UK has image has no audio

[tom66]

Re: LG 37LC7D UK has image has no audio

Yep 2V is fine for an on signal. The 3.4V pin needs to measure around 3.4V.

[bleed4me]

Re: LG 37LC7D UK has image has no audio

Ok tom66 I triple checked these numbers and here are the new values


#1
3.4on-2.49
GND-0
6.5-6.54
A DIM-.02
GND-0
ST 5V BURST-5.29
DIM-.16
ERR INV-.85
CTRL-3.25
GND-0
ST5V-5.29
ON/OFF-3.03
ACD-5.17


#2
GND-0
12V-13.1
GND-0
3.4V-3.63
GND-0
6.5V-6.5
now the remaining 4 pins I dont understand the board but here are the values
0
0
.42
.43

[bleed4me]

Re: LG 37LC7D UK has image has no audio

Now riddle me this tom66 tried it again and check out these values


#1
3.4on-2.38
GND-0
6.5-6.17
A DIM-1.6
GND-0
ST 5V BURST-5.05
DIM-3.33
ERR INV-.81
CTRL-3.10
GND-0
ST5V-5.05
ON/OFF-2.88
ACD-4.93


#2
GND-0
12V-12.71
GND-0
3.4V-3.48
GND-0
6.5V-6.16
now the remaining 4 pins I dont understand the board but here are the values
0
0
.45
.45

[bleed4me]

Re: LG 37LC7D UK has image has no audio

Values always change when I turn it off and bring it back up. One question I have is while the tv is off should any of these have a voltage value to them? Another thing is I mentioned a random video earlier I saw and wonder if this could be my problem.

https://www.youtube.com/watch?v=b-bwX8_Ys70

[stj]

Re: LG 37LC7D UK has image has no audio

you really need a full recap.
specially the small ones near the opto isolators.

[bleed4me]

Re: LG 37LC7D UK has image has no audio

Appears a full recap is getting alot of votes so a full recap will be in the works. 2 questions though... This will sound rediculous but is that monster of a cap in the middle included in this recap and are those with what it appears to be some kind of shrink tubing are those caps as well and if so why are they covered like that?

[stj]

Re: LG 37LC7D UK has image has no audio

the high voltage ones can stay.
the plastic cap is so you cant touch the can because they are rated at several hundred volts.

[bleed4me]

Re: LG 37LC7D UK has image has no audio

Just so we are on the same page the 4 small ones on the board with the shrink tubing are high voltage but get replaced?

[stj]

Re: LG 37LC7D UK has image has no audio

i'm refering to the 2 big ones in the center.
the small things your refering to are inductors if they are marked with "L"before the number on the board.

[bleed4me]

Re: LG 37LC7D UK has image has no audio

OK perfect...I wondered what those were and now I know...thank you for sharing your insight! I will get the ball rolling on doing a full recap...

[bleed4me]

Re: LG 37LC7D UK has image has no audio

OK riddle me this that last photo is a stock picture of my board on shopjimmy and has 2 monster caps on it...if you look at the pictures I posted earlier of my actual board there is only one monster cap...what's that about?

[vinceroger69]

Re: LG 37LC7D UK has image has no audio

The difference with two capacitors maybe one board is for 110 volts maybe the other board is for 240 volts im not 100% sure.

[vinceroger69]

Re: LG 37LC7D UK has image has no audio

please ignore you have already checked what i was going to say in post 1

[bleed4me]

Re: LG 37LC7D UK has image has no audio

Just wanted to give an update on how the recap went... 18 caps total replaced and after an undisclosed amount of time has passed I know have a working tv WITH SOUND!!!! I just want to thank every single one of you for your knowledge and help. I could not have done it without you and it is much appreciated. You guys nailed it to a T...thank you so much. Im couldnt be happier that I found this forum.