update on this lg telly

[terry681]

lg 32lcd2 symptoms are no picture or sound i have checked the caps and noticed one bulging replaced it

c208=680uf.16v still same symtoms.
i have tried all the scart plugs with xbox etc but to no avail even linking the laptop to the rgb connector still

no picture.
the screen shows a blue screen with a no signal logo moving around the screen. can not use the remote to turn tv

off really nothing as it wont function at all now i olso have done some voltage measurments on the psu p201-

p202-p203.
after reading wrogs posts regarding this set and done the things he was asked to do and this is what i came up

with.

p201---no. 1)3.4von=2.00v
2)gnd=
3)6v=6.05v
4)DIM=2.83v
5)gnd=
6)st5v=5.06v
7)ERI=2.77v
8)ERR=the voltage i get on this pin starts to drop and what does the ERR STAND FOR ERROR MAYBE
9)i-c)4.8V
10)GND
11)ST5V=5.06V
12)ON=3.16V
13)acd=5.10V

P202---no. 1)gnd
2)12v=11.92v
3)gnd
4)3.4v=1.08v
5)gnd
6)6v=6.05v
7)gnd
8)gnd
9)16v=19.25v
10)16v=19.25v

p203---no. 1)gnd
2)gnd
3)12v=11.92v
4)12v=11.92v
5)gnd
6)gnd
7)6v=6.04v
8)6v=6.04v
9)gnd
10)gnd
11)3.4v=1.08v
12)3.4v=1.08v


i olso checked Q123=23.5v .
im not sure if i checked the smd that runs across the relay and i get these reading using my dmm in the diode

setting=d160=.486-one way and 459 the other way d161 shows 1.540 and 587 and can a bad relay give these symtoms as

it looks like a bunt mark on the component side of the pcb.
im sorry ill try and get some decent pics up for yous to look at as i keep failing in loading pics on my post ty

all for looking. and hope iv done this correct.

[netdent]

Re: update on this lg telly

Sounds like it could be the main av board if no response from buttons

Ronnie

[terry681]

Re: update on this lg telly

the av board im right in thinking that the av board is the board with the scarts on it.
ill post some pictures as can a bad relay give the same problems as i can see what looks like a hole on the pcb of the psu near smd d160 diode and 161 looks like solder is missing and from the component side the relay shows a burnt sign on the board

[terry681]

Re: update on this lg telly

ive removed the relay and tried to get resistace or continuty on it but nothing was using a dmm and i think the burnt mark on the pcb i dont think is meant to be there as i was thinking it didint look right but i could be wrong.
and where would i get in the uk or the net the right smd diodes and the relay from as i cant seem to find the right one or im searching it wrong again ty all for looking at my problem .
and is there anything i can do to be sure that the problem could be as the other fella stated the av board could be bad.

[netdent]

Re: update on this lg telly

If you put 5volts across the coil of the relay (2 tabs on the right of pic) the relay should click on, then check the other 2 contacts, should be closed when power applied.

Ronnie

[delaware74b]

Re: update on this lg telly

netdent - that relay needs 18 volts for the coil. Refer to the second photo in post #4.

[netdent]

Re: update on this lg telly

netdent - that relay needs 18 volts for the coil. Refer to the second photo in post #4.

Oh right! well spotted, jumped the gun, I tested one today, must have been smaller voltage, would think 12volts will power the coil enough to test, sorry

Ronnie

[terry681]

Re: update on this lg telly

well im not sure in testing it would this be right that i use a dc volts supply say a adapter with either 12 v or 18 v preferibly and atach the pos+ and neg- to the 2 pins u pointed out in post 5 so i will see if it clicks.
but i could hear it click when ac plug is pluged in the tv makes 3 clicks that sound fast compared with my other 2 tv a samsung and a old samsung they sound to be slower in ticking if that makes sense.

[netdent]

Re: update on this lg telly

well im not sure in testing it would this be right that i use a dc volts supply say a adapter with either 12 v or 18 v preferibly and atach the pos+ and neg- to the 2 pins u pointed out in post 5 so i will see if it clicks.
but i could hear it click when ac plug is pluged in the tv makes 3 clicks that sound fast compared with my other 2 tv a samsung and a old samsung they sound to be slower in ticking if that makes sense.

If you power it as you said you can check to see if the switch is closing with your multimeter on the other 2 contacts, should be open when not powered

Ronnie

[Krankshaft]

Re: update on this lg telly

I had a Panasonic set with a fried main relay. There was a charred spot on the board and the contacts were stuck in the on position.

Occasionally I got a nasty arcing sound from it along with the smell of burning plastic. The funniest thing was when I hit the power off button the video drive was cut off but it still had deflection .

If the coil registers as an open circuit when you perform a resistance test the relay is bad. That along with the burnt plastic on the coil contacts signifies it's fried.