LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

[slappala]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

Hi,
It's been a Long time from my last post, but I will let you know that the optocoupler mod has worked to this day , so about 6 years. TV is still working.

Today I got one black horizontal line in the middle of the tv screen and also I have some red dots on black backgrounds sometimes.

I think this tv is going to the recycling plant now. Tried to fiddle with the ribbon cables but no help for the black line.

Happy to hear the optocoupler mod has helped others too.

[err500]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

can someone post a pic of this solder bridge on disable AC detect optocouplers

my TV looks like this one https://www.badcaps.net/forum/attach...4&d=1396268836

[Shipmaker]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

Ok, I take the Backside of again and found this: PDP 42V80201
//DC 5,0 V //Va 60V // Vs 185 V max Watt 250.


Hope this helps to identify the Control Panel !

Nice, to hear from you!

[Alastair E]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

Doesn't quite work like that!

You would need to send me your Control-Board, I update it--and send back to you.....

Be too expensive to send my jig, my PC, the PSU for control-board and all the wiring/software to you to do it yourself!

---

Let me know the panel-number inside, and if you can get it--The Control-Board numbers, (small board under the metal chassis holding all the AV and Mainboard stuff) I have a spare control-board, maybe its the same type/version....

[Shipmaker]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

Thank you again!

yes now I understand the praxis, and you a right, because if i wanne make a upgrade it s better to do nothing with the pottis.
while my familie look tv I was searching for the panel number on the backside of the tv but maby i must opening the backside again to find it!

When I find the panel number I tell you and you can send me the upgrade!

Buy!

[Alastair E]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

Here you go--

http://www.slashdocs.com/mhqsvt/plas...-for-cd-1.html

[Alastair E]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

No--Not done by USB or anything like that.

The Control-Board has a socket that you plug the special jig into attached to the PC and directly re-new the firmware.
You dont even need the set to do the job, just the control-board, the jig, computer and the software and firmware files.

Altering the pots will only give a partial cure I found.

[Shipmaker]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

First at all the bridge works since two hours

I read my service manuall and found nothing of firmware update.
Than go to LG Homepage and found only the manuall to downloud, than I walk to the television and look if there is an usb connection, but there is none!
So I think there is no way to update the firmware, but I found in germany a page who is discriping how to take of any pixelsnow with working on the Pottis(
Vsetup etc.)Here the Linkhttp://www.hifi-forum.de/viewthread-141-2177.html
My TV is the LG42PC1RV build in 2006.

Again Thanks!

[Alastair E]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

According to my data--its updateable, Its the Control-Board firmware that needs doing, not the mainboard or the set itself.

Tell me the numbers written on the back of the banel metal-work, be something like 42X3####

[Shipmaker]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

Thank you for the fast reply,

now i try out to fix my tv with an solder bridge!

I dont now if this kind of Modell LG 42 PC 1 RV is able to update on software side
but i will take a look on my service manuall and tell you if it s possible.

But again Thanks a lot!

[Alastair E]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

You can bridge the opto with blobs of solder done carefully this is fine.
--But,--As Tom says--Only bridge the one side of the optos.

The green spots can be adjusted out sometimes but the official cure is a Software Update to the Contol-Board.
--Let me know if you want control-board update, I have the complete kit to update lots of LG sets--including the PC1 series....

[Shipmaker]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

Hallo everybody I m new on this board!

Thank you for your solution, because i v got the exactly same powersupply in
my LG42PC1RV and in nobody could help me, but now!
I also recogniced while I looking tv that a little green snow apperes, to see
in black parts of tv picture and while changing programm.

But my Question is : How do you bridge with solder or with a wire?

(Please, forgive me my bad english, i am german)
Thanks!

[tom66]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

This has to be the tenth TV with this issue so far fixed. Glad to hear, enjoy your TV!

[er_rusty]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

Pin 4-3 on BOTH optocouplers. i.e. 2nd choice.

Only bridge the devices which have 4-3 on the SECONDARY (isolated side.) Do NOT bridge them on the primary.

It works!!
Thank you again!!

[tom66]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

Not relevant to your model unfortunately.

[benfinland]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

What are these optocouplers? And where? I was wondering about bridging them to see if the tv will fire up

[er_rusty]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

Pin 4-3 on BOTH optocouplers. i.e. 2nd choice.

Only bridge the devices which have 4-3 on the SECONDARY (isolated side.) Do NOT bridge them on the primary.

Thank you!

[tom66]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

Pin 4-3 on BOTH optocouplers. i.e. 2nd choice.

Only bridge the devices which have 4-3 on the SECONDARY (isolated side.) Do NOT bridge them on the primary.

[er_rusty]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

Okay, pin 4 on the optocouplers is on the phototransistor side.

They're the only signals coming FROM the primary to the secondary, normally the signals go to the primary side from the secondary.

Need a closer pic of under these devices.

You will probably need to place a solder bridge between pins 4-3 on both optocouplers. That's how I fixed mine.

Hi to all!! I'm new, I have a LG 42PC1RV-ZJ plasma TV that had the same symptoms slappala TV. I think that the solution can be the same.

Please, i don't understand very well what i have to do:
Maybe I have to place a solder bridge between pins 4 of one optocoupler to pin3 on the other???
Or I have to put a solder bridge between pin 4 of a optocoupler to pin 3 on the same in booth optocoupler?

TOM66 help me please!

Thanks a lot!!

[tom66]

Re: LG 42PC3RA SMPS power_ysus problems on/off/on click and fixes

Great, so there is no issue. Yes, it only happened on mine when power is unplugged, and only then on bright scenes. Dark scenes caused no click. I figured this was due to the standby supply lasting longer than the main supply so the TV could recognise a power failure and cut off the speakers.