hi everyone i have a problem with this plasma. At any moment the video is no longer visible and only the audio is heard. Is there anyone who can help me? i turned on the tv and noticed a hum on the ysus and the heatsinks are all cold on both ysus and zsus. The voltages vs va are all correct. Disassembling the buffer board there is an integrated in short circuit because it is in continuity. Thanks for the help
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Re: LG 50PH670S no video only audio
Post some photos of the board and also of the area around the component that is short circuit.Willing to help but I'm no expert. -
Re: LG 50PH670S no video only audio
Ok this Is a photoAttached FilesComment
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Re: LG 50PH670S no video only audio
In photo 2 you have the cable disconnected. Are you saying that one of the two buffer IC's shown are short circuit.
Can you post a photo of the panel labelAttached FilesLast edited by dick_barton; 05-24-2021, 07:35 AM.Willing to help but I'm no expert.Comment
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Re: LG 50PH670S no video only audio
I disconnected the flat cable because on the contacts of that flat it gave me continuity so I assume that one of the two buffers is shorted and I tried with the disconnected one if it turned on the screen after which I stopped and asked on the forumComment
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Re: LG 50PH670S no video only audio
If the buffer IC is shorted then you will need to replace the circuit board unless you are able to or have a friend who can replace the faulty IC.
With it disconnected did you have a picture with just the bottom missing?Willing to help but I'm no expert.Comment
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Re: LG 50PH670S no video only audio
Can you measure -VY which as shown in the photo. Your meter leads connect as the arrows show red to red, black to black. Be careful not to short the meter lead on the heatsink.Attached FilesLast edited by dick_barton; 05-24-2021, 09:09 AM.Willing to help but I'm no expert.Comment
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Re: LG 50PH670S no video only audio
I measure 36/37 vComment
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Re: LG 50PH670S no video only audio
It should read 190V. Was the last ribbon cable still disconnected. Can you post a photo of your board. Bright and clear.
Edit
You did put your black meter lead on -Vy and the red meter lead on the +Vy to take the measurement? Your meter leads should be connected to the two points at the same time.Last edited by dick_barton; 05-24-2021, 09:45 AM.Willing to help but I'm no expert.Comment
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Re: LG 50PH670S no video only audio
measurements are made correctly and all cables are properly connected, heatsinks are coldComment
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Re: LG 50PH670S no video only audio
Had you reconnected the bottom cable that connects to the short circuit buffer and then taken the measurement?Willing to help but I'm no expert.Comment
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Re: LG 50PH670S no video only audio
If the bottom buffers are short circuit then I would remove the ribbon cable and make certain that it is clear of any obsticles and then do that check again.Last edited by dick_barton; 05-24-2021, 10:12 AM.Willing to help but I'm no expert.Comment
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Re: LG 50PH670S no video only audio
measured even with the ribbon cables of the buffers disconnected and nothing changesComment
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Re: LG 50PH670S no video only audio
If that the case then it looks as though there is a problem with the Ysus board.
Wait and see what other forum members can advise.Willing to help but I'm no expert.Comment
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Re: LG 50PH670S no video only audio
you know what transformer this is because it's brokenAttached FilesComment
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Re: LG 50PH670S no video only audio
Why do you think the transformer is broken.?
I think it's the one that produces the -Vy but I'm not 100% exactly sure.Willing to help but I'm no expert.Comment
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The Problem: This player has a toggle switch to select between Stereo, Mono R, and Mono L. Regardless of the setting it outputs the sound to both the L&R audio jacks. In the Mono R position, the audio output level is normal (from both the L and R audio output jacks), in the Stereo position the audio output is about half the volume, and in Mono L, it's about 3/4 the volume. Something about putting it into Stereo mode is causing the volume to drop significantly and I can't figure it out.
The player processes the audio signal using two different reference frequencies. The "R"... -
Hi There,
This TV was auto switching off after few seconds with some vertical lines on the screen, so got a new TCON board and replaced it.
After replacing the TCON board it was working fine and i set it up with everything, used for few hours, then had the bright idea to update the software on it. During the update process, TV switched off and now no audio or video. No relay switch sound.
More Details
TV Model - LG OLED77G1PUA
Got the same exact TCON board from TVPartsToday and replaced it. But didnt transfer the EPPROM data (didnt... -
Hey everyone!
I've gotten this TV for free, neither have it seen a TV repair man, neither have it been opened before.
This post describes my entire troubleshooting process of this TV.
When I turn it on using the ON/OFF switch at the side of the TV, the light rapidly flashes green, then it stays on, but it does not react to any of the remote buttons, side buttons, and doesn't play audio.
I've taken the unit apart, and I've started to check some voltages:
- On the P11 connector, there is 15V DC only for a brief moment, then it goes
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Hi,
My barely 3 year old TV has stopped displaying video, although the video output comes for a few seconds after turning ON which displays the manufacturers logo then shows the home screen (all this with some blue flicker) then the video goes blank and the screen is dark blue with the backlight on. The audio output works perfectly and the TV also takes in voice commands(smart TV).
The TCON board has the following Chips -
Samsung VTU63A0
RT6939 - 2nos.
and all these chips are getting real hot within a minute, I dont know if this is normal....
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