westinghouse LVM-47w1
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fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully! -
Re: westinghouse LVM-47w1
there could be a a boarder line resistance short happening ,can you do a resistance test to ground on the +rails on the inverters?,you should see lots of of kohms,if there is a few ohms,that could indicate a short somewhere,and will have to check the transformer drivers for shorts,passives etc
a short would filter back through the feedback circuits ,and cause some reverse voltage,and that may be the sound your hearing from that capacitor under more load,and the mainboard shuts the psu down and so on
i think it is the picture but will reflow anywayComment
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Re: westinghouse LVM-47w1
no not those,i mean the on the inverter,you have all the connectors from the psu/mainboard bringing in the voltages to the inverter yes?,
well those would be your +rails to check for low ohms to ground,in other words there maybe a low ohm short there that is shutting of the psu etc.
if the inverter isnt happy it will send back a signal through the feedback circuits,and that will tell the psu to shutdown.fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: westinghouse LVM-47w1
okay with the plug disconnected ohm meter set to 200M
master board
VBL 1.3
VBL 1.3
VBL 1.3
VBL 1.3
VBL 1.3
GND 1.0
GND 1.0
GND 1.0
GND 1.0
GND 1.0
VSEL 2.0
E_PWN 2.0
L_PWN 2.0
BL_ON 1.6
Slave board
VBL 2.2
VBL 2.2
VBL 2.2
VBL 2.2
VBL 2.2
GND 1.0
GND 1.0
GND 1.0
GND 1.0
GND 1.0
NC open
NC open
VBL is where the 24V are coming in from the power board, VSEL down is connected tot he main board
i just checked them again the master VBL are all 1.1 and the salves are 1.6Last edited by smai; 01-16-2014, 03:25 PM.Comment
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Re: westinghouse LVM-47w1
okay with the plug disconnected ohm meter set to 200M
master board
VBL 1.3
VBL 1.3
VBL 1.3
VBL 1.3
VBL 1.3
GND 1.0
GND 1.0
GND 1.0
GND 1.0
GND 1.0
VSEL 2.0
E_PWN 2.0
L_PWN 2.0
BL_ON 1.6
Slave board
VBL 2.2
VBL 2.2
VBL 2.2
VBL 2.2
VBL 2.2
GND 1.0
GND 1.0
GND 1.0
GND 1.0
GND 1.0
NC open
NC open
VBL is where the 24V are coming in from the power board, VSEL down is connected tot he main boardfixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: westinghouse LVM-47w1
those readings dont indicate a short then...going to have a read back through thread againfixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: westinghouse LVM-47w1
have you re-solderd the inverter transformers,and what looked like cold joints on that capacitor in earlier post?fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: westinghouse LVM-47w1
do the transformers,they can suffer with cold joints toofixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: westinghouse LVM-47w1
not really ,could do more damage then good without the right gear
hand-draulic im afraid...fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: westinghouse LVM-47w1
when i was talking the board off i thought i would try powering it on with the bulbs disconnected interesting result
on the slave side when any of the bottom 4 bulbs are connected the cap makes that noise with everything else is connected and those 4 are unplugged no noise, the backlight still shuts off in any situationComment
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Re: westinghouse LVM-47w1
so it could be tube failiure then,do you have a spare set of good ones and plug those in?they would definatley cause your symptomsfixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: westinghouse LVM-47w1
no spares, since this monitor has 2 inverter boards would it have 12 tubes or 24? i can move a tube to another spot and see if the problem moves with it right ? where would i even get a new tube ?
or cani i move he inverter board down and plug the bulbs into a different plug and see if the problem is still thereLast edited by smai; 01-16-2014, 05:21 PM.Comment
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Re: westinghouse LVM-47w1
could be either 12 or 24,moving a tube to a different position wont make any difference,if there is a bad tube,the feedback circuits will know and shut down.
i keep tubes from tv's for testing stuff like this,makes it easier if you do a lot of tv repairs.fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: westinghouse LVM-47w1
so if i plug number 9 into the 8th spot (no noise with 8) and i get the noise that will tell me the tube is bad right ? if i dont get the noise then something on the inverter board is bad right ?Comment
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Re: westinghouse LVM-47w1
if they are starting to fail they will draw more current,which is overloading everything,it mite work what your asking.
if you had a spare one,you could swap one at a time,until the inverter stays onfixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
----------------------------------------------
please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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