Lg 50LN5600 no video but audio is good.

[dabiscan]

Looking for help on LCD TV problem.

No video but with a flashlight it can be 'seen. When I power the Tv up,the Lg symbol displays for a couple seconds, then disappears. After troubleshooting, I replaced the main board as it was suggested . I still have the same problem.
When it powers up the backup lights glow for a second and then turn off.

Can somebody tell me how to determine what's wrong with a digital multimeter?

[Hamie]

Re: Lg 50LN5600 no video but audio is good.

You almost certainly have an open LED.
Very common is the LN and LA series.

Difficult repair If youve never dismantled a TV before.

[ReeceyBurger123]

Re: Lg 50LN5600 no video but audio is good.

Would you like a link to my video showing how to test the and replace the Leds ?

[johns1mj]

Re: Lg 50LN5600 no video but audio is good.

yes please post the video

[dabiscan]

Re: Lg 50LN5600 no video but audio is good.

I'm a mechanic however I've never replaced the led 's before. Is there a manual?

[dabiscan]

Re: Lg 50LN5600 no video but audio is good.

Yes ...Please post the video. TY

[cliff_hootarski]

Re: Lg 50LN5600 no video but audio is good.

https://www.youtube.com/watch?v=RxwdC7V5Ue0

LED repair stacking method.

By: MrReeceyburger123

And another good watch: https://www.youtube.com/watch?v=RRyhx4D8mcA by Grants Pass TV Repair

From ShipJimmy: https://www.youtube.com/watch?v=NI9wOZKHOVE

Another repair method(didn't work), but shows disassembly and reassembly of LED panel: https://www.youtube.com/watch?v=JA1JCxn1DqY

And one more: https://www.youtube.com/watch?v=Bf5T2wwtydY by norcal715

[Brian_STI]

Re: Lg 50LN5600 no video but audio is good.

Seen it before, I can verify that it's bad LEDs. If you want to test them, after disassembling, the board the input voltage for each strip(two strips connected in the middle) is 24v DC. Half a strip turns on at 10v DC but will only work if you bridge the connector in the middle(It will be two traces that slide into the other board). It's less than 400mA btw.

[budm]

Re: Lg 50LN5600 no video but audio is good.

http://www.shopjimmy.com/catalogsear...?q=Lg+50LN5600
http://www.shopjimmy.com/lg-eay62810...upply-unit.htm
Is taht your wpoer supply LED driver board? If it is, it has two LED driver circuits to drive two set s of LED strings.
You will need to test the Voltages at both LED+ and both LED- pins.
You will leave the black probe on the chassis, then put RED probe on one of the two LED +, THEN turn on the TV to see how high the Voltage goes up to and then wait for 5 seconds to see how low it drops down to, do the same for the other 3 pins and report the readings, we will not be surprised if it is not due to bad LEDs.
BTW, Voltage feeding the LED+ should be around 111VDC (with load).
We also need to see the pictures of your boards.

[ReeceyBurger123]

Re: Lg 50LN5600 no video but audio is good.

https://www.youtube.com/watch?v=RxwdC7V5Ue0

LED repair stacking method.

By: MrReeceyburger123

And another good watch: https://www.youtube.com/watch?v=RRyhx4D8mcA by Grants Pass TV Repair

From ShipJimmy: https://www.youtube.com/watch?v=NI9wOZKHOVE

Another repair method(didn't work), but shows disassembly and reassembly of LED panel: https://www.youtube.com/watch?v=JA1JCxn1DqY

And one more: https://www.youtube.com/watch?v=Bf5T2wwtydY by norcal715

Cheers buddy I didnt see updated thread lol

[dabiscan]

Re: Lg 50LN5600 no video but audio is good.

You guy are awesome TY