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Search: Posts Made By: Biruslapio
Forum: Troubleshooting TVs and Video Sources 08-12-2022, 12:41 AM
Replies: 1
Views: 192
Posted By Biruslapio
Re: LG 50PB690 power supply terrible noise

It was some residue on one of the transformers. The one connected to the STR had absolutely corroded, TV was working still, even after fixing that and touching up the board a lot, it was still doing...
Forum: Troubleshooting TVs and Video Sources 08-11-2022, 05:45 AM
Replies: 6
Views: 270
Posted By Biruslapio
Re: Black screen LG 43UK6300PLB

I've been seeing more and more LG K series having panel problems, the most common fault is just a black screen, no image at all.

Like their F, H and J models, all have garbage panels that last 3...
Forum: Troubleshooting TVs and Video Sources 07-13-2022, 12:46 PM
Replies: 1
Views: 192
Posted By Biruslapio
LG 50PB690 power supply terrible noise

I bought this TV with really bad oxidation on the power supply and bottom X boards, it was working but during pickup there was a lot of background noise so I don't know if it had this problem before....
Forum: Troubleshooting TVs and Video Sources 06-21-2022, 06:00 PM
Replies: 50
Views: 3,883
Posted By Biruslapio
Re: Lg 60pa6500 black spots on tv

You're looking for something like this:
https://pt.aliexpress.com/item/4000348824214.html
Now I do not know if this one fits, but it's a connector very similar to this one in the pictures.
Forum: Troubleshooting TVs and Video Sources 06-02-2022, 09:15 PM
Replies: 17
Views: 798
Posted By Biruslapio
Re: LG 50PA4500 Plasma Troubleshooting

I circled what I could see in the image, not all those components are suspicious or fail regularly, the opto model should be 155E and the most suspicious resistors are 1.0, 2.2, 10.0 and 100 OHMs...
Forum: Troubleshooting TVs and Video Sources 05-28-2022, 04:54 PM
Replies: 5
Views: 318
Posted By Biruslapio
Re: Interesting tv screen restoration

Very well done in the video, almost perfect except for one edge.

The TVs where this layer is bubbling or peeling off are at least 13 years old, so they are worth nothing, or at least not worth the...
Forum: Troubleshooting TVs and Video Sources 05-28-2022, 09:02 AM
Replies: 6
Views: 303
Posted By Biruslapio
Re: Lg 60PZ550 no picture

Do the auto_gen test by removing the LVDS cable and shorting two pads on the logic board, the tv should start by showing test patterns, if the image is good and stable the fault lies on the main...
Forum: Troubleshooting TVs and Video Sources 05-25-2022, 07:09 AM
Replies: 17
Views: 798
Posted By Biruslapio
Re: LG 50PA4500 Plasma Troubleshooting

Ok, I'll go into more detail, check these circled components.

On the Y-SUS these 5 pin optocouplers drive the IGBTs, they cannot be shorted, also there are some 2.2, 10 and 100 OHMs SMD resistors...
Forum: Troubleshooting TVs and Video Sources 05-25-2022, 06:52 AM
Replies: 17
Views: 798
Posted By Biruslapio
Re: LG 50PA4500 Plasma Troubleshooting

When IGBTs fail often their gate resistors and some 2W resistors go open from the current surge.

I thought the boards were blackened from the heat, it's actually smoke, that must smell.
Forum: Troubleshooting TVs and Video Sources 05-24-2022, 04:33 PM
Replies: 17
Views: 798
Posted By Biruslapio
Re: LG 50PA4500 Plasma Troubleshooting

Ok. Are you replacing 30F126 with RJP30K? What happens is that the transistor's pins in Panasonic boards have less length, they may not reach the holes all the way, solder them well.
Forum: Troubleshooting TVs and Video Sources 05-20-2022, 07:33 AM
Replies: 17
Views: 798
Posted By Biruslapio
Re: LG 50PA4500 Plasma Troubleshooting

It won't, the heatsink and hole spacing are different, replace IGBT with the same model, be caureful of fake parts.
Forum: Troubleshooting TVs and Video Sources 05-19-2022, 11:53 AM
Replies: 5
Views: 252
Posted By Biruslapio
Re: Schematic or datasheet for Plasma TV buffer chip

ST also has very useful datasheets, I had no luck finding any Panasonic or Renesas.

https://category.alldatasheet.com/index.jsp?sSearchword=plasma&list=150&cate=4
Forum: Troubleshooting TVs and Video Sources 05-19-2022, 04:12 AM
Replies: 5
Views: 252
Posted By Biruslapio
Forum: Troubleshooting TVs and Video Sources 05-18-2022, 10:44 AM
Replies: 17
Views: 798
Posted By Biruslapio
Re: LG 50PA4500 Plasma Troubleshooting

All plasma sustain boards use IGBTs, and they're the worst part about the repair, hard to find original parts, so if you run into a RJP63F3 or 30J127 compare it against an original, if the label has...
Forum: Troubleshooting TVs and Video Sources 05-17-2022, 11:18 AM
Replies: 9
Views: 510
Posted By Biruslapio
Re: Borderless TV screens (without bezel)

I know this won't help but..

What a god, this man had no internet acess and managed to remove a glued panel without destroying it.

In phones the procedure is either a very thin double sided...
Forum: Troubleshooting TVs and Video Sources 05-17-2022, 09:00 AM
Replies: 34
Views: 1,012
Posted By Biruslapio
Re: LG 50PC56 keep burn Buffers Boards

Doesn't look like it, the horizontal lines are the cables not properly inserted or the buffer boards being damaged, the bad image is from the Y-SUS, something is damaged.
There's a single vertical...
Forum: Troubleshooting TVs and Video Sources 05-17-2022, 04:05 AM
Replies: 34
Views: 1,012
Posted By Biruslapio
Re: LG 50PC56 keep burn Buffers Boards

That's it, shorting the AUTO_GEN pads on the logic board with the LVDS cable disconnected, the TV will start on with a black screen the jump between colors and patterns each 2 seconds or so.
Forum: Troubleshooting TVs and Video Sources 05-16-2022, 03:42 PM
Replies: 34
Views: 1,012
Posted By Biruslapio
Re: LG 50PC56 keep burn Buffers Boards

When a plasma panel is shattered while running it shorts internally and sometimes kill the buffers, y-sus and/or z-sus, also if it is powered on while the screen is broken.

That said, always test...
Forum: Troubleshooting TVs and Video Sources 05-16-2022, 07:17 AM
Replies: 34
Views: 1,012
Posted By Biruslapio
Re: LG 50PC56 keep burn Buffers Boards

The exact same image? but buffers not shorted this time? have you tested them before installing?
Forum: Troubleshooting TVs and Video Sources 05-13-2022, 07:42 AM
Replies: 4
Views: 276
Posted By Biruslapio
Re: Plasma Panasonic TC-P42C2

Yes, that will require magnifying lens, hot air and patience, you have to compare the two boards side by side and check every component, some of them are different.

Or you can look at this .pdf,...
Forum: Troubleshooting TVs and Video Sources 05-12-2022, 03:58 PM
Replies: 4
Views: 276
Posted By Biruslapio
Re: Plasma Panasonic

Wrong variant of the board? If your original board was for example TNPA5066AB and you replaced with AC the voltages are tuned differently and will change how the plasma panel operates, causing these...
Forum: Troubleshooting TVs and Video Sources 05-07-2022, 07:25 PM
Replies: 34
Views: 1,012
Posted By Biruslapio
Re: LG 50PC56 keep burn Buffers Boards

There are some buffer chips on the Y-SUS that bridges the signal from logic board to the Y-buffers, very rarely they fail, but let's focus on the buffer boards first.

If the IC is getting abormaly...
Forum: Troubleshooting TVs and Video Sources 05-07-2022, 01:59 PM
Replies: 34
Views: 1,012
Posted By Biruslapio
Re: LG 50PC56 keep burn Buffers Boards

By ribbon it means the cables that goes from Y-SUS to buffer and top to bottom boads, or the panel contacts?
Edit: a quick search reveals that it's those small cables, they do not look properly fit...
Forum: Troubleshooting TVs and Video Sources 05-07-2022, 09:44 AM
Replies: 34
Views: 1,012
Posted By Biruslapio
Re: LG 50PC56 keep burn Buffers Boards

You still did not test the buffers with the multimeter.

Put all 12 screws, there's no going wrong with that.

Looking at that latest photo, first try a buffer board swap, then if it still has...
Forum: Troubleshooting TVs and Video Sources 05-06-2022, 09:29 AM
Replies: 34
Views: 1,012
Posted By Biruslapio
Re: LG 50PC56 keep burn Buffers Boards

Test the buffers before anything else like I've sugested.
The panel is fine, it's very resilient to damage.
Showing results 1 to 25 of 365

 
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