I have a Samsung PN42C450B1D That has no video/osd but does have sound. All voltages are correct. I've replaced the Main and logic boards but still no picture. The heat sinks are warm on the x and y main boards. Can't even bring up the internal test pattern. Any ideas?
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Re: PN42C450B1D No video or OSD
When you say all voltages are correct are you including VSC and VE? -
Re: PN42C450B1D No video or OSD
I have a set of boards from one of those..in case you need something else..Comment
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Re: PN42C450B1D No video or OSD
Yes. Vsc is -197, Vs is 207v and Va is 54v.Comment
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Re: PN42C450B1D No video or OSD
Is the panel glowing.
Even slightly?
You might need to darken the room.Comment
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Re: PN42C450B1D No video or OSD
Yes.Comment
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Re: PN42C450B1D No video or OSD
Well you've probably bought a faulty control board. Are both control boards not displaying test patterns?
You positive you've applied the jumper to the correct pins?Comment
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Re: PN42C450B1D No video or OSD
I will double check!Comment
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Re: PN42C450B1D No video or OSD
Neither board will bring up test patterns. I replaced the Y-Scan drive (LJ92-01739C) and still had no picture. But did notice the green led on the logic board was blinking very slow (before changing the y-scan drive board, it blinked every second). And I notice the heat sinks on the Y-main and the X-Main are cold with the new Y-scan) I replaced with the old Y-scan and the heat sinks warm up and the green LED blinks every one second. I may sub the Y-main and the X main.Comment
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P15 Gen 1 (type 20ST, 20SU) Laptop (ThinkPad) - Type 20ST needs the main BIOS and video. The client says that after the Windows updates there was a firmware update and after that the device makes the sound of music when there is no screen. Moreover, if you turn it on several times then the picture sometimes appears and it works and passes all tests (wonder)
and may even reboot normally a couple of times
Now he doesn't want it anymore, no matter what I tried
It helped to change the video cable a couple of times, I ordered a new cable, it didn't help
Of course I checked the... -
Hi,
I have confirmed that I have a mainboard problem.
I have tracked no hardware issued on board so might be a software dump required.
I have searched a bit but wasn't able to find anything for my screen:
Here are some more details:
Panel: cy-nn065hgev1h
Main: BN94-14180M P08F
Your help much appreciated!
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Hi and thanks in advance for any input you might provide!
I have a Sceptre U550CV-UMRD8POTV83BB 4K LED (this is a dumb tv) that I bought new in August 2021, so It's just completed 3 years.
Main power board model: TP.MS3683.PC821 T-Con board: N4TP546UHDPU2L_BO
Last Sunday I was watching a dvd and fell asleep for about half hour, when I awoke the tv screen was black and couldn't get the dvd menu to show, so I changed the input to antenna and had sound but no picture, turned it off. I then got online and found this great site! ....read many troubleshooting tips and this... -
I suppose the real question is whether the existing pinouts from ether a 17IPS71 psu are cross compatible with a 17IPS12 psu? If they are then the exchange of the main boards should have no issues providing the screen is compatible with both main boards. Obviously you can change the screen configurations easily enough (providing you have the correct files) for the main board. Why may you ask would I do this? Well a lot of the smart features are no longer working on a Hitachi 48HBT62U main board I wish to give it a new lease of life!
Obviously the same LVDS connector for the screen connection...
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