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Jepree replied to LG 50PZ550-ua no picture, has sound.

in Troubleshooting TVs and Video Sources

12-21-2015, 12:01 PM
Re: LG 50PZ550-ua no picture, has sound.

Again thanks for all your knowledge and help HAMIE! After doing more tests and following the service manual you were right it was that board that was faulty. Purchased a new Control/Logic Board and now she works beautifully again. Again thanks much HAMIE all the help and insight was very appreciated! ...

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Jepree replied to LG 50PZ550-ua no picture, has sound.

in Troubleshooting TVs and Video Sources

12-16-2015, 01:49 PM
Re: LG 50PZ550-ua no picture, has sound.

Curious as to where i would be able to get a Main Board for this unit if needed? Everywhere i look its all sold out or out of stock. Is there a comparable board from another unit i could substitute?

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Jepree replied to LG 50PZ550-ua no picture, has sound.

in Troubleshooting TVs and Video Sources

12-13-2015, 03:46 PM
Re: LG 50PZ550-ua no picture, has sound.

Hi Alastar. I get excited time and time again so I just jumped on the Control Board, and because it was in stock as well as cheap lol.

Where is a good place for test points on the PSU to check for 12v? Vs and Va were both within limits, I assumed thoes were the test points.

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Jepree replied to LG 50PZ550-ua no picture, has sound.

in Troubleshooting TVs and Video Sources

12-13-2015, 12:09 PM
Re: LG 50PZ550-ua no picture, has sound.

Ordered a new Control Board and will post when installed so hopefully that rectifys the problem. Was scared it was going to be the Main Board which no one seems to stock anywhere!

Thanks again Hamie, will keep you posted. And if there were any other tests I could do please let me know.

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Jepree replied to LG 50PZ550-ua no picture, has sound.

in Troubleshooting TVs and Video Sources

12-12-2015, 09:37 AM
Re: LG 50PZ550-ua no picture, has sound.

Yes when I had my DMM in diode mode it did light up the LED. Would that mean the the CTRL Board was slowly failing in which the unit would progressively take longer to power up?

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Jepree replied to LG 50PZ550-ua no picture, has sound.

in Troubleshooting TVs and Video Sources

12-11-2015, 05:55 PM
Re: LG 50PZ550-ua no picture, has sound.

Hamie first and foremost thanks for being so helpful, youre awesome!

So I tested the a couple pins on the ribbon cable off the Control Board like you asked in the picture. Im getting about 3.3v on average for the majority of pins.
As for the Main Board, is there any good places to check for voltage?

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Jepree replied to LG 50PZ550-ua no picture, has sound.

in Troubleshooting TVs and Video Sources

12-11-2015, 07:55 AM
Re: LG 50PZ550-ua no picture, has sound.

Ill try it again when I get home from work but I believe when I tried it was at 8v but ill have to double check.

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Jepree replied to LG 50PZ550-ua no picture, has sound.

in Troubleshooting TVs and Video Sources

12-11-2015, 05:47 AM
Re: LG 50PZ550-ua no picture, has sound.

No its actually reading 0 volts. Thats on the very first pin on the ribbon connector above the triangle.

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Jepree replied to LG 50PZ550-ua no picture, has sound.

in Troubleshooting TVs and Video Sources

12-11-2015, 12:40 AM
Re: LG 50PZ550-ua no picture, has sound.

-Voltage is permanent.
-Screen is completely black in a dark room.
-No humming noise from Ysus.
-I do not have a blinking LED on the control board, am I suppose to?
Am I suppose to take my voltage measurement after a rough amout of time after power up?

And haha yes I ment fuse sorry!

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Jepree replied to LG 50PZ550-ua no picture, has sound.

in Troubleshooting TVs and Video Sources

12-10-2015, 08:26 PM
Re: LG 50PZ550-ua no picture, has sound.

Thanks for the tips. Here were my numbers.

Va=55.1(55) Vs=201.8(201) Vy=190.2(190) Vsc=150.3(150) Vzb=114.9(115)

I also tried unplugging the ribbon cable for Zsus herd sound plugged it back in and unplugged Ysus herd sound as well.

3 things that concerned me were:

1. Disconnected the ribbon cable from the CONTROL BOARD to the MAIN BOARD jumped R51 ato R52 to try the "Test Pattern" but the screen was still blank.

2. On the Ysus Board the resistor FS203 was...

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Jepree started a topic LG 50PZ550-ua no picture, has sound.

in Troubleshooting TVs and Video Sources

12-10-2015, 03:25 PM
LG 50PZ550-ua no picture, has sound.

Hello, im new to this world of TV sets and troubleshooting. I have read though post to diagnose the problem myself but with my limited knowledge im not sure where to go from here.

The Plasma started taking long for the picture to appear, about 5 min sometimes, 10 min sometimes, 15 min sometimes but now the screen does not power on at all but has had sound without the picture. When i turn it off i do hear a loud pop.

- Va and Vs measure as posted on the sticker.
- Tried jumping R51 and R52 with no test signal present on screen.

I was going to...

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Jepree replied to New Members - please post your introductions here

in Announcements & Related News

12-10-2015, 01:57 PM
Re: New Members - please post your introductions here

Well im Canadian with a decent amount of electrical through my AME (Aircraft Maintenance Engineer) experience but dang televisions seem to be a different beast altogether haha. This site seems to be very informative and will be asking qiuestions soon. Please bear in mind I am an amature in this department so no laughing haha.

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LG 50PZ550-ua no picture, has sound.

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