Guys thanks for the help...especially to tom66
I think I'll buy new one, cause this is way to much or damaged or just one stupid thing but I can't figure out what...
TNX
p.s. see U on the forum
swen_blueneon
Member
Last Activity: 08-08-2019, 04:57 AM
Joined: 12-30-2011
Location: Osijek, Croatia
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Re: LG 1919s no power
Guys thanks for the help...especially to tom66
I think I'll buy new one, cause this is way to much or damaged or just one stupid thing but I can't figure out what...
TNX
p.s. see U on the forum
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Re: LG 1919s no power
yes, it is TL431 (K1A 431A 628)
BTW tried with 10Ohm 10W resistor and everything is the same.
The noise didn't change even if I connect monitor and CCFLs..just ''crc crc....''...Leave a comment:
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Re: LG 1919s no power
Recaped with some Chemicon and some Rubycon and still got the same issue..
Really don't know what else to do?!
Leave a comment:
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Re: LG 1919s no power
U201 is a three-terminal adjustable shunt regulator, it's near D202 and all 1000uF caps
This sound is occuring 2-3 times in a second, but when I have powered up LCD and saw OSD, it was a continous sound.
p.s. you can hear the ''crc'' sounds in my video just few posts above
I'm just looking at datasheet of FAN7601..but voltage on Vcc pin is 9-9.5V, startup voltage havent mesured right now, but if I remember right, it was 11V.Last edited by swen_blueneon; 12-30-2011, 06:27 PM.Leave a comment:
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Re: LG 1919s no power
Voltage on diode is 9-10V
Also tested FAN7601 Vcc is 9V (pin 7+ and 5-)
Just supid question to ask, but...can U201 cause trouble in 5V line?Leave a comment:
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Re: LG 1919s no power
I'll try to get caps you have mentioned...maybe tomorrow, or after NY.
Hmm...+12V when LCD is not connected, and not working (no picture) voltage is +17.5V, but when LCD i connected and still not working it +16.3VLeave a comment:
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Re: LG 1919s no power
Tnx for the help
I have recaped with noname caps, then with Jamicon..
BTW, when I plug VGA cable in and try with push power button and plugin in power cable, again nothing happens...no picture, just this irritating ''crc'' sound..
I really have no ideas what else can it be..
The guy in electronics shop tells me that LG/Philips have trouble with PSU, and the are tricky to fix...he has Philips LCD and he says that he have changed twice all the caps and ICs and God knows why monitor at first wasn't working, and then...Leave a comment:
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Re: LG 1919s no power
@selldor - here's the pic from above
[url]http://img823.*************/img823/6336/igp4867.jpg[/url]
this schematic is newer I think..
Here caps start with 20, except those two near mains they are 103 & 105
202- 1000uF 25V
203- 680uF 25V
204- 1000uF 25V
205- 1000uF 25V
206- 1000uF 25V
207- 470uF 25V
some of them (1000uF) were 16V, but to be safe I've used 25V
@tom66
I've mesured D201 and D202
D201
RED->BLK
12- rising...Last edited by swen_blueneon; 12-30-2011, 03:02 PM.Leave a comment:
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Re: LG 1919s no power
Just tried once again putting the power chord in socket and I saw for a little bit orange light on LED, and than goes off.
Can't figure out how to stabilise 5V...maybe new caps again? :$
Tried connecting LCD without backlight, but no picture was displayed...same problems...Leave a comment:
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Re: LG 1919s no power
This one axial cap is replacement, but same as the original 0.47uF 50V
I have mesured D102 you've highlited, RED->BLK=528; BLK->RED=1, so I think it's ok.
Capacitor replaced with new one 33uF 63V, nothing happend, still the same mistery
BTW can you tell me what values are used for this general purpose capacitor?
here's the link for service manual:
[url]http://www.eserviceinfo.com/downloadsm/61808/LG_LG%20L1919S.html[/url]
here's the link on YouTube...my 5V output and misterious noise...Leave a comment:
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Re: LG 1919s no power
Images are fixed now..they are just links, because pics are big so you can see details
I'll check the diodes, and caps again, and let you know what happend!!
p.s. it is mains fuse,..i'll go to store for new 3.15ALeave a comment:
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Re: LG 1919s no power
As far as I can see, there is only one fuse, on the mains...I have replaced original with T 2.5A, cause I haven't got T 3.15A, but this can't be a problem.
p.s. I've replaced the X201 14.31818MHZ, but nothing...the step-up is still producing the same wierd sound.Last edited by swen_blueneon; 12-30-2011, 08:09 AM.Leave a comment:
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LG 1919s no power
Hi guys..I've just read the article about bad caps in LG L17NT-A..the PSU PCB is little different than in mine, but it's the same thing.
Ok, monitor was working, and then just go black..
When I have opened the case, i saw bad cap 1000uF/16V, ok, and the main fuse 3.15A was dead too.
I've ordered all the caps, the list is the same as fore the above LCD, and changed them...and when I have connected everything, monitor has powerd up, by itself directly after plugging power chord, for about 3-4 seconds, i saw OSD and again dead..LED was green, and when it goes black LED...Last edited by swen_blueneon; 12-30-2011, 08:44 AM.
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