How to replace a lopt on an LG TV. Three wires from the lopt connect to the crt socket. The socket is a molded type with no apparent way of diconnecting the three wires. I have a new lopt to replace the old one. I dont want to aatempt to open it by force incase the socket gets damaged.
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Re: Replacement of LOPT on an LG TV
You will have to cut solder /splice the 3 wires Be sure to dress the splices after soldering with electrical tape. That's the only way if the CRT socket is sealed. Just don't mix up your wires, They should be color coded. Let me know if you need any additional help.
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This is the HT leak from the LOPT . You can remove the back panel after switch off and on switch on - in a dark condittion- will be able to see the sparks shorting. If so switch off and let the HT drain off. There will be high voltage on the CRT and so care must be taken not to touch the anode as HT might flow. Use a dry cloth to clean ,use petrol to clean all dirt and static dust, clean the LOPT.
clean the HT leads. Use some insulation if the leak is more specially from the transformer. If the clicks are still heard without switch on then it is internal leak within the LOPT and it must be replaced,
This sounds like the OPT or LOPT has blown or weak ( OPT = Line output transistor. LOPT = Line output transformer.)
This job should only be carried out by a professional engineer. I would take it to your local TV repair person.
Hope this helps.
CAPACITORS Argh. the worst component in anything...LOL..
Right u sound like you know what u are doing.
I would suggest you change your LOPT, or even the lopt.
LOPT = Line transformer .
lopt = line transistor. usually a au808
If you do not understand this, u should not be in the back of this tv.
if one point hits the power before the other it will cause a strike that can burn out circuits in the unit frying them to the point of total shutdown this is called lopt striking. these components will need to be found and replaced by a servcie tech
there is no quick fix in regards to this problem sorry.
always remember no matter what your plugging into a wall socket always make sure the switch is turned to off first to stop lopt striking
The service person who told you so is correct. EF series LOTs are of old National Kit, and is not available now. If you have a chance to get it from somewhere, it will cost more that RS 800/= ie about $18, and with that money you can purchase a new kit for your TV, provided your TVs picture tube is good. Just do as you like in this case. Todays TV kits are assemled and aligned, comes with more than 250 channels and includes all accecories, like remote handet, fitting material and so on. OK.
Yes require sodering iron lopt is the Line output transformer large cylindrical plastic item on circuit board that has a thick wire that connects to the CRT (tube) with cap on the end. Do Not Touch as 24
check for fly back transformer
but remember that before you replace any thing in eht section check for power supply output to be ok.
also check for diodes,capacitor connected to flybacktransfomer.
also check for mica sheet is not cracked or h/output is not touching to chassis.
If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service. Even when plugged out, TV's can store very high voltages.
Generically speaking anything in the horiz deflection, hv development area will cause a no pix symptom, also a problem in the signal processor section, video river and output section as the crt/socket assembly.
I would also check the lopt transistor and probably the fuseable resistors around the lopt.