Lg 32ln530b-ua

[knightdad]

hello all i new here
i have an Lg 32ln530b-ua working on
pb is eax64905001 2.6
main is eax65049107 1.0
my problem is this the stand by led are not working
on the ir card i have the volts going to it 3.5
when testing the pb i get 3.5 an 12 volts
when pressing the on button nothing happens
could this be the main
could be the pb
i replace both from shop jimmy an still same problem
i get the volts 3.5 to stand by but no led light
i have not replace the ir card
how does the dry-on work on pb
thanks brandon

[Hamie]

Re: Lg 32ln530b-ua

It could be the remote sensor and buttons.

You could try jumping on then powersupply and backlight to rule out the powersupply board.

upload some photos always helps.

[budm]

Re: Lg 32ln530b-ua

Good clear pictures of the backside of the TV and the boards needed.

[knightdad]

Re: Lg 32ln530b-ua

pics of set
there is stand by volts going to ir card at bottom of set
3.5 volts the led does not light up
thanks for the help

[newtothis]

Re: Lg 32ln530b-ua

Can you get a closer pic of the label near connector P201 please so we can read it.

[knightdad]

Re: Lg 32ln530b-ua

more pics for yall
let you know volts coming out to
ok nothing plug in to pb i get
3.5 12 the no other ones
the ps-on no volts should i test by putting ps-on to 3.5 right or ps-on to ground
an whats dry-on for

[knightdad]

Re: Lg 32ln530b-ua

i get 3.5 volts all the way just no led there is 3.5 at ir card

[newtothis]

Re: Lg 32ln530b-ua

3.3v to PWR-ON with a ~500ohm resistor then check voltages

DRV-ON - Drive ON for backlights

[knightdad]

Re: Lg 32ln530b-ua

will do now
ok ps-on jump get 3.5 12 volts
the 24 is there for an sec them i remove probe an back its there for an sec then gone
i removed all plug an retest same out come 3.5 12 no 24
i uesd dirffient ground points same out come
thanks for the help ALL OF YOU

[knightdad]

Re: Lg 32ln530b-ua

drv-on use 3.5 to trun on to

[knightdad]

Re: Lg 32ln530b-ua

ok here what i got so far jump ps-on an drv-on
i get back lights still no 24 volts
so what i say is the pb is not working right
now i have to trace down 24 votls to see why
i think this is right

[budm]

Re: Lg 32ln530b-ua

3.3 is generated by Diode D203, C201, LB201, and C209 form the Pi filter for the 3.3V. Please verify.
The 12V output is generated by buckconverter IC202.
Check the DCV on the two legs of the filter caps C203, C204 to see what you have, you should have about 24VDC which is fed to the backlight boost converter circuit to drive the LEDs.
The electronics switch SMD Q201 is turned on by the PS-ON to supply the Voltage to run the 12V buck converter Power supply IC202 and also feed the 24V output connector.
So for you to have 12V out put, switch Q201 must be working to supply 24V to run the 12V switching power supply.
Photo supplied by Shopjimmy.

[knightdad]

Re: Lg 32ln530b-ua

no 24 vdc it there for an sec when i test it it reads13-20 for an sec then goes

[budm]

Re: Lg 32ln530b-ua

no 24 vdc it there for an sec when i test it it reads13-20 for an sec then goes

But the 12V stays on? this done with PS-ON pin stays connected to the 3.3V pin through the resistor and no cable connected to the main board, right?

[newtothis]

Re: Lg 32ln530b-ua

Can you also list the names of each pin and reading please so it makes a little more sense as to where you are testing these voltages.

[knightdad]

Re: Lg 32ln530b-ua

yes 12 stays on with ps-on jump
yes testing with no cables just the powerboard
i get 3.5 12 an 70 for backlights no 24 i get 24 for an sec seems like when load down it goes away

[knightdad]

Re: Lg 32ln530b-ua

p201 i get no 24 volts out

[newtothis]

Re: Lg 32ln530b-ua

Ok this is making no sense to me at all.

Can you list the connector pins P201 like this

GND = 0v
GND = 0v
12v = 12v
N.C = 0v
12v = 12v

etc etc

Looking back at the initial posts.... You say you had the 12v present at P201 before jumping the PS-ON signal with the main disconnected??

How are you testing the voltages?.. Red to pin Black to chassis?

[knightdad]

Re: Lg 32ln530b-ua

C203, C204 they have volts not stady 24 volts i get 20 max an in pulse i test it comes up an sec then goes away rest of volts ok

[knightdad]

Re: Lg 32ln530b-ua

ok
gnd=0
3.5=3.5
12v=12v
24v=none
70v backlight = 70volts
done with ps-on jump
the 24 is there for an sec then gone when i put probe to it it is there but does not stay unload