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Equipment Repairs => LCD TV forum => Topic started by: t1412 on December 07, 2013,10:09:54

Title: 42lg3000za
Post by: t1412 on December 07, 2013,10:09:54

hi fella's has anyone got service manual for this tv 42lg3000za, thanks for your time

regards
shaun

Title: Re: 42lg3000za
Post by: jordan on December 07, 2013,15:27:51

It is this-chassis LD84A
SM Iam send on your email

Title: Re: 42lg3000za
Post by: t1412 on December 07, 2013,17:38:14

much appreciated jordon

shaun

Title: Re: 42lg3000za
Post by: t1412 on December 07, 2013,21:55:28

the problem with this is, it switches on no back light but shine a torch on the screen  with lights off i can see an image, have got 24v going to inverters 12v is 12.45 5v and 15,5v have tested fuse on tcon board whiches ok also the inverter fuses are ok, thats where i am at the minute. any info would be great thanks for your time
ps,sorry i forgot to mention i do have sound

regards
shaun

Title: Re: 42lg3000za
Post by: Tidosho on December 18, 2013,16:33:45

If you've verified all voltages and fuses, the next step is the backlight itself. It is a fluorescent tube, they do burn out, your average TV will ship from the factory with the brightness on full. The higher the brightness, the hotter the tube runs, the quicker it burns out, the anodes on either end turn black, so the reaction between them and the mercury gas doesn't occur.

I fix TV's as well as laptops, so I simply connect a standard laptop backlight to it if I'm troubleshooting one. If it lights, the original screen backlight is at fault. If it doesn't light and you know the CCFL lamp is good, something else is wrong. If you determine the screen backlight has gone, replacing it can be tricky, as the screen has to come apart, any fingerprints on the layers inside the screen or diffusers and you'll wreck the screen, so if you're not sure, take it to someone who replaces backlights in panels.

Failing that, if you see a replacement screen, and it's worth the cost, replace the screen as a whole, and have the old screen fixed for a spare to keep safe :)

Title: Re: 42lg3000za
Post by: watteau on December 19, 2013,03:41:04

Hi,
Isn't this the model where the LCD panel's internal PCB contained
pulse ceramics capacitors that used to burn-up?, and if really bad,
would damage the PCB.
Regards

Title: Re: 42lg3000za
Post by: t1412 on December 19, 2013,08:28:51

oh that don't sound to good, i'll have a check thanks fella's

shaun
 

Title: Re: 42lg3000za
Post by: marky mark on December 19, 2013,13:22:25

At the side of the screen there are a couple of holes,when the caps burn,  theres a slight trace of smoke damage, they also smell burnt a bit