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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

03-11-2016, 03:46 AM
Re: Lg 50pk750 help!!!!

Update,

Im sad to say that the first board I put in the oven didnt make it out alive.. While using gloves to pull it out I managed to literally wipe off the tiny resistors soldered to the bottom of the board...

On the second go around I learned from my mistake and didnt remove anything, however, it made no difference

So, Im still without a TV and am thinking I should just part it out and buy a new one...

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

03-08-2016, 12:20 PM
Re: Lg 50pk750 help!!!!

2Old2,

Im going to have to try this out!

I have 2 main boards so hopefully ONE of them works!

Ill update after trying this

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

02-15-2016, 12:48 PM
Re: Lg 50pk750 help!!!!

Really, need help here

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

02-13-2016, 04:51 PM
Re: Lg 50pk750 help!!!!

Hello Vince,

I did purchase a main board and after installing it nothing changed. The ebay seller I bought it from had a 0 return policy because I could not prove to him it was faulty, thats the reason for asking for help to troubleshoot it so I could prove to him it was faulty. He stated that it wasnt and Paypal/Ebay will not refund you your money...

I need to know how to test (using a multimeter) to see if the main board is bad as well as the control board...

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

02-13-2016, 03:31 PM
Re: Lg 50pk750 help!!!!

Hello, anyone?

Anyone?

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

02-11-2016, 11:32 PM
Re: Lg 50pk750 help!!!!

Bringing this back from the dead, can anyone help me troubleshoot the main board? I have a multimeter and can follow directions

I want to be 100% the Main board I purchased is bad before trying to source yet ANOTHER one!

Thanks!

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

11-04-2015, 09:46 PM
Re: Lg 50pk750 help!!!!

I have a question, could it be the AC Det? This is posted in the manual I downloaded

d Note: If the AC Det line is Missing, the TV will not turn on. (Relays will click, then no functions).

^^^ This is exactly what its doing, it clicks then no functions...

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

11-04-2015, 05:03 PM
Re: Lg 50pk750 help!!!!

This board was purchased as refurbished from a seller on ebay... I dont believe I can receive a refund. If I cannot Id prefer to troubleshoot this board to fix the problem.

Hamie, can you help me thru the steps I need to take to troubleshoot this board if I cannot get a refund?

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

11-03-2015, 05:30 PM
Re: Lg 50pk750 help!!!!

UPDATE!!!!

I just received the board, installed it and...... STILL NOTHING!!! :/

I unplugged the LVDS and shorted the two jumpers and the test patterns still work... WHAT COULD IT BE? I HATE TROUBLESHOOTING BLINDLY

HAMIE?

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

10-25-2015, 09:35 AM
Re: Lg 50pk750 help!!!!

Ok, so pop off the board and check for bad points? I regards to the voltage regs no Im not 100% sure but am confident I can look it up... Or if youd like to link a video and or describe what to do thats fine as well.

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

10-24-2015, 07:57 AM
Re: Lg 50pk750 help!!!!

Anyone care to guide me in the right direction?

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

10-23-2015, 11:57 PM
Re: Lg 50pk750 help!!!!

Im not afraid to troubleshoot, with a little help

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

10-23-2015, 11:28 AM
Re: Lg 50pk750 help!!!!

Hamie stated that the board is hard to come by

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

10-23-2015, 11:23 AM
Re: Lg 50pk750 help!!!!

Only question is, which one is the "Main Board"? Its the board with all of the inputs on it correct? If not then I take it its the board in the center that has P31 on it?

Thanks again all!

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

10-23-2015, 11:14 AM
Re: Lg 50pk750 help!!!!

Never mind Hamie,

Im an idiot and unplugged the wrong cable... Luckily the unit didnt power up when I jumped the two lol...

UPDATE:

After jumping the R51/52 together while P31 was unplugged I DID GET THE TEST PATTERNS! Looks like im sourcing a MAINBOARD!

...

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

10-23-2015, 10:25 AM
Re: Lg 50pk750 help!!!!

Ok removed the LVDS cable and jumped the R51/52 holes and nothing happened. With the cable disconnected the LED on the front panel doesnt even light up.

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

10-23-2015, 10:18 AM
Re: Lg 50pk750 help!!!!

Never mind I got it, P704 cable is the LVDS cable.. Just remove that cable and test by jumping the two stated earlier?

EDIT: Just saw your post Hamie, thanks!

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

10-23-2015, 10:14 AM
Re: Lg 50pk750 help!!!!

Will do, not to sound stupid but which cable is the LVDS cable?

Also, given the two scenarios if the test patterns work then whats next?

If the test patters dont work then whats next?

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

10-23-2015, 09:26 AM
Re: Lg 50pk750 help!!!!

Yes, I stated that in my initial post... It flashes 1 long then 1 short (11)

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LGinMD replied to Lg 50pk750 help!!!!

in Troubleshooting TVs and Video Sources

10-23-2015, 09:14 AM
Re: Lg 50pk750 help!!!!

Nothing on the screen... Again, regardless of what button I push on the front panel the screen remains the same (Nothing)..

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