As stated on the title it kicks on then no screen or backlight but has sound. Can't find a service manual on it also.. thinking it's either the t-con or signal board. Thanks for the help
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Re: LT-42EM59 sound no picture no flickering blue light
Brand of the TV?
Also:
https://www.badcaps.net/forum/showth...257#post487257
https://www.badcaps.net/forum/showth...299#post290299Last edited by budm; 10-11-2014, 08:34 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809 -
Re: LT-42EM59 sound no picture no flickering blue light
jvc. and i'll take some pics tommorow.. i figured it was something a bit simpler it's cool thoughLast edited by jdoncouse; 10-11-2014, 08:41 PM.Comment
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Re: LT-42EM59 sound no picture no flickering blue light
if u dont have backlight, then its more than a tcon problem, if its even a tcon problem at all. can you see the picture when u shine a bright light at the screen and look closely?Don't fear the repair...Comment
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Re: LT-42EM59 sound no picture no flickering blue light
No i can't see any picture nor backlightComment
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Re: LT-42EM59 sound no picture no flickering blue light
hmm usually when i get sound and no backlight, i can see some picture when i shine a bright light at the screen and look very closely. its possible both your backlight and your tcon have gone out at the same time, though seems unlikely. check voltages at all connectors in on and off mode and write them down. check that fuses are good, regular and surfacemount on the motherboard, inverter, and tcon also check the voltages at both ends of each fuse while the tv is on and write them down. wish i knew more, but u gotta start with the basics!Don't fear the repair...Comment
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Re: LT-42EM59 sound no picture no flickering blue light
There's some images.. finally found a service manual and some weird stuff after browsing through it. for one if i put my black prong for my multimeter anywhere on the chassis which i'm sure should be the ground it starts reading voltage without the red prong being touched anywhere. I used another torn apart tv's chassis for the ground and got the voltages from that. The fuse is 100~101v when the tv is off. when it clicks on it's goes down to anywhere 30~40v. The biggest thing is i tested the pins that goes to the master and slave inverters and from what my service manual says pins 1-5 on both of them should be 24v *is reading 17~18* and 5-10 should be gnd *also reading 17~18 for some reason.. The person who is having me look at the thing says that it played sound when the screen went out *havn't tested inputs to figure out if that's true* but i wonder if the power board is borked and that's why everything isn't powering on right Screen/inverters for backlight and yes i can't see anything on screen at all too to answer previous question.Comment
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Re: LT-42EM59 sound no picture no flickering blue light
well u should never take the clients word for anything. you should verify if you can get sound, i use a n64 for my sound tests because it turns on and just starts playing the music of the game right away. plug a known source of sound and video into one of the inputs, turn on the tv and try to cycle the inputs and turn up the volume until you hear sound coming out.Don't fear the repair...Comment
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Re: LT-42EM59 sound no picture no flickering blue light
gonna try *lol good thing to try too haha* also. looking at the manual again.. there is a live and isolated ground... maybe thats why the chassis ground isn't working how i expected? never dealt with that before.. -_-Comment
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Re: LT-42EM59 sound no picture no flickering blue light
yea me neither...not sure what that means. maybe wait for someone with more knowledge to chime in...
are u saying theres 2 separate grounds? one live and one isolated? whatever that means?Don't fear the repair...Comment
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Re: LT-42EM59 sound no picture no flickering blue light
well the power board has a isolated *neutral side* and a live ground side. that's what i'm understanding from itComment
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Re: LT-42EM59 sound no picture no flickering blue light
oh and in the future when posting images, use the image uploader thing instead of posting them inline...Don't fear the repair...Comment
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Re: LT-42EM59 sound no picture no flickering blue light
and it wouldnt hurt to post the service manual here tooDon't fear the repair...Comment
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Re: LT-42EM59 sound no picture no flickering blue light
"The biggest thing is i tested the pins that goes to the master and slave inverters and from what my service manual says pins 1-5 on both of them should be 24v *is reading 17~18* and 5-10 should be gnd *also reading 17~18 for some reason.."
Any one worked on this TV before? Re-seat the cable between the power supply board and the inverter boards, make sure all the board mounting screws are tight then take the reading on the 24V pins again using black probe on the chassis.
Are these the inveretr boards?
http://www.shopjimmy.com/cmo-27-d011...verter-kit.htm
BTW, when making DC Voltage measurement in the primary (HOT, DEADLY SIDE) you will use the negative leg of the main filter cap as the circuit ground ref. point for your meter. The chassis can be used as the ground ref. point when making Voltage measurement in the secondary (cold side) of the circuits.Last edited by budm; 10-12-2014, 04:42 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: LT-42EM59 sound no picture no flickering blue light
i'll do that right now
https://mega.co.nz/#!JocUDCSS!taVcUy...jvzKguoNzODTv0Comment
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Re: LT-42EM59 sound no picture no flickering blue light
i meant use the "manage attatchments" feature in "advanced" to upload the manual hereDon't fear the repair...Comment
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Re: LT-42EM59 sound no picture no flickering blue light
whatever budm says, u read twice (maybe 3 times to be sure u know what hes asking) then do and report. guy knows his stuff
Don't fear the repair...Comment
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Re: LT-42EM59 sound no picture no flickering blue light
Yeah that's them. I've tried to reseat the cables on them and tried again. same thing but give me a little bit and i'll go try again and this time test the soundComment
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Re: LT-42EM59 sound no picture no flickering blue light
haha sorry there ya go . didn't even think about itComment
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Re: LT-42EM59 sound no picture no flickering blue light
but yeha let me go grab my nes and head downstairs again to test some things i'll be backComment
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