Hello, hoping someone can chime in and assist with this one. Have a 50" plasma LG that turns on when you push power button. Light in front turns blue and you hear the click on the power supply. I also see a green led on the T-con board, so Im assuming that means both the T-con and the mainboard are fine? Tried unplugging the Y main and z-main, one at a time but no difference. I get no backlight, no menu's no sound nothing. Would you suspect the Y-main being bad? I also see no blown caps on any of the boards. Tested all fuses and none of them showed OL. Any help would be appreciated, thanks!
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
Pictures needed of y and z sus.
You'll need to check voltages,
Vs & va located on power supply.
Vsc and -vy located on y-sus
Zbias located on z-sus
There may be test points etc or they may be measured across a resistor. -
Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
pictures attached, let me know if that helps any.Attached FilesComment
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
Ive also attached the service manual for this tv as wellComment
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
bump, anyone? I'd really like some help on this to get it fixed asap
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
Bump, update.
Plugged tv in and tested voltage on both plugs that go from power supply to y sus and z sus. All voltages are normal on both. Also I get a green power light on the t-con board. Again no visibly blown or burnt parts.
Anyone else have input for the next step?Comment
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
As requested by Hamie, check -Vy, Vsc and Vzbias. These are marked on the Y-sustain and Z-sustain. The Y-sus has -Vy and Vsc, the Z-sus has Vzbias. Usually, there are components you have to test across.
If you're still unsure give me the "PDP model number", this is the model of the internal display panel assembly and will be something like PDP50K90000, marked on a sticker marked "LG Electronics Korea" or similar and I will get you a guide.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
The only thing I was aware of was the 5v, Va, and Vs which all tested good. No idea how I would test what you mentioned. The model is pdp50h30022.
If you have ideas on what to do that'd be great!Comment
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
OK search for "50H3" in this document
[SM].pdf.pdf&mfg=LG-Zenith
It tells you the steps for testing.
DO NOT adjust anything yet... we need to see if there is an obvious fault, since this does not cover troubleshooting.
You can ignore the oscilloscope stuff too.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
try copying this into your browser URL
Code:http://www.toms-service-manuals.com/getfile.php?mode=viewpdf&req=LG_Plasma_Panels_42G1_42G2_42T1_42V7_42X2_42X2A_42X3A_42X4A_50G1_50G2_50H2_50H3_50R1_50T1_50X2_50X3_50X4_60H1_60H2_60H3_60R1_60X6_60X7_71H2_panel_alignments_[SM].pdf.pdf&mfg=LG-Zenith
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
Alright vsc and vy are right on. Vzb is 115 and sticker says it should be 105. Does that mean the z board is bad?Comment
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
Thats OK for now.
Do you have a faint glow from the screen?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
Hey tom is there a way to reach you faster than on this forum? I really appreciate your helpComment
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
Sorry for late reply. Your-vy is ok.
You positive that the panel isn't glowing. You may need to darken your room to confirm.Comment
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
If you unplug the z-sus do you get an image?Comment
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Re: LG 50" Plasma 50PS30-UB powers on, no picture, no sound
No I do not on either of those questionsComment
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But it seems they didn't get too far and just left it.
When I first took a look I was amazed at how pristine the inside looked.
Its as if the TV had been in a time capsule.
Caps looked like they were just pulled off the self.
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Hi all
I was just given a Samsung TV with the issue. I read various threads and videos and attempted the ribbon tape method to gain an image, but no luck.
Symptom:
No picture no sound.
When I plug in the power cord, Backlight LED turns on for a half second and then turns off. The red LED next to the power button located center bottom flashes 2 or 3 times. When the power button is pressed after, it does the same thing.
No sound at all.
What I tried:
1. I tried unplugging the left or right ribbon...
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