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LG 21FU1RG CRT TV

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hispeck

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Compliment of the season everyone
I have this LG21FU1RG CRT TV am working on, this tv came with horizontal line as soon as you power it on, and will shut down doesn't stay on and i hear a noise. i need solution pleasssssssssse
Hispeck
 
Sounds like the vertical amp is shot.

Do you have a schematic?
 
No i don't have the schematic, but i change the vertical with a new one still the same, the tv will just power up with single horizontal line and shut down i also need the schematic too.. lg 21fu1rg
 
This is a service manual only. I was unable to find a schematic.
 

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No i don't have the schematic, but i change the vertical with a new one still the same, the tv will just power up with single horizontal line and shut down i also need the schematic too.. lg 21fu1rg

Well CRT sets are long obsolete, so all manuals have been thrown away - but generally simply changing the frame IC isn't going to help, as it's VERY likely if the chip has failed it will have blown the fuse-able resistor that feeds it, usually from the LOPTX.
 
Well CRT sets are long obsolete, so all manuals have been thrown away - but generally simply changing the frame IC isn't going to help, as it's VERY likely if the chip has failed it will have blown the fuse-able resistor that feeds it, usually from the LOPTX.

I concur that the feeder resistor from the LOPTX to the Frame IC will be shot if the Frame IC was originally blown....BTW, we are still fixing stacks of CRT here :eek:.....and there are MANY damn LG's.....I have never seen so many variations of a CRT circuit that LG presents.....

LG CRT here are normally LOPTX gobblers. And ALL the LOPTX's are different even if the chassis "appear" identical...

Crazy stuff. Take a chance when replacing the LOPTX with a LOPTX with not exactly the same part no as the original...and you normally destroy the Frame Stage.

tv
 
I hope your not slagging off my TV's!

LG
 
And then the penny dropped:woot:.....I was trying to work out what you and CRT had in common???

LG=LG :woot::p

How are you these days little Champ?

Regards,
tv
I am good thanks, busy most the time :D, building then rebuilding my lab. I find I dont sleep very much, hard to sleep when you want answers!! So I spend 90% of my freetime on various obscure projects lol. How are you? I have a friend in SA who is a chemist, I am working on a joint project with them.
 
I am good thanks, busy most the time :D, building then rebuilding my lab. I find I dont sleep very much, hard to sleep when you want answers!! So I spend 90% of my freetime on various obscure projects lol. How are you? I have a friend in SA who is a chemist, I am working on a joint project with them.

You are gonna finish school right?

Regards,
tv
 
You are gonna finish school right?

Regards,
tv
I wasnt no, but I have already been offered an early place at 2 universities. So instead I have decided to stay at school then goto uni at the normal time.
 
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