lcd19-229 stand by light on and off

[tonyuk]

hi got this small tv dvd tv that wont stay on when i switch on the light turns green then goes back to red see pic off layout

[tom66]

Re: lcd19-229 stand by light on and off

common fault on these is bad LDO regulators on main board.

[tonyuk]

Re: lcd19-229 stand by light on and off

common fault on these is bad LDO regulators on main board.

whats that lol how can i test ?

[tom66]

Re: lcd19-229 stand by light on and off

https://www.badcaps.net/forum/showthread.php?t=22231

[multimeter]

Re: lcd19-229 stand by light on and off

if its a technika one,it will be bad output caps also....

[tonyuk]

Re: lcd19-229 stand by light on and off

if its a technika one,it will be bad output caps also....

it sure is technika caps look fine on main and psu ?

[multimeter]

Re: lcd19-229 stand by light on and off

it sure is technika caps look fine on main and psu ?

if i remember correctly the output caps are g-luxon?,these go bad but dont show symptoms,actually they aint bad !.

id rule them out with capacitance and esr test just to be sure

[tonyuk]

Re: lcd19-229 stand by light on and off

pic im still reading up the link tom put but a little lost lol

so far i know mine r 1117 Regulator

[tonyuk]

Re: lcd19-229 stand by light on and off

https://www.badcaps.net/forum/showthread.php?t=22231

3 have 1117 b then under say 33 641

1 has 1117 b then under say ade11u

so im gues the top 3 r 3.3 volts ? and would test left to right

[tom66]

Re: lcd19-229 stand by light on and off

Top are 3.3V, bottom is 1.25V.

The voltages should be tested left to right, in the orientation in which the labelling on them reads the right way around i.e. you don't have to crane your neck

[tonyuk]

Re: lcd19-229 stand by light on and off

Top are 3.3V, bottom is 1.25V.

The voltages should be tested left to right, in the orientation in which the labelling on them reads the right way around i.e. you don't have to crane your neck

ok and says you test on 20v setting yes ? even though i thought 2v would of been the way lol

[tom66]

Re: lcd19-229 stand by light on and off

20V, because that's the maximum range your meter can support. If you tried to read 3.3V on a 2V range, your meter would just show over-range ("OL" or single "1")

[tonyuk]

Re: lcd19-229 stand by light on and off

20V, because that's the maximum range your meter can support. If you tried to read 3.3V on a 2V range, your meter would just show over-range ("OL" or single "1")

ok thanks tom will check them and post

fitting kitchens or building engines is so much easier

[tom66]

Re: lcd19-229 stand by light on and off

Haha, maybe for you, honestly I'd probably fit the kitchen upside down and have half the parts from the engine missing.

[tonyuk]

Re: lcd19-229 stand by light on and off

ok so below is list

1st

=000
=3.31
=5.07

2dr

=000
=3.32
=4.98

3dr

=000
=3.31
=4.97

this is the 1.25v

=0.61
=1.86
=3.38

this is me testing with light stuck on red stand by black lead to screw red to each pin left to right lol

[tom66]

Re: lcd19-229 stand by light on and off

Can you try making the measurements as you turn the set on for the last three? You may have to turn it on and off a lot of times. A close picture of the power supply showing the label would help too.

[tonyuk]

Re: lcd19-229 stand by light on and off

Can you try making the measurements as you turn the set on for the last three? You may have to turn it on and off a lot of times. A close picture of the power supply showing the label would help too.

ok re-done list above with green light on

[tom66]

Re: lcd19-229 stand by light on and off

Hmm, my error on the 1.25V. That is OK, it is just normal adjustable type. doh.
Readings seem good, so there's little more to suggest.
Can you see part U7 near one of those LDOs? What is the part # on it?

[tonyuk]

Re: lcd19-229 stand by light on and off

Hmm, my error on the 1.25V. That is OK, it is just normal adjustable type. doh.
Readings seem good, so there's little more to suggest.
Can you see part U7 near one of those LDOs? What is the part # on it?

yerp u7

[tom66]

Re: lcd19-229 stand by light on and off

Part # printed on device U7 please?