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Re: Lg 50pk950 turns on by itself (stumped!)
Here are the results:
pin1: 2.858v
pin3: 3.159v
pin4: 3.304v
No fluctuation found within several minutes, but I'm not standing there for 20 minutes or whenever the TV turns itself on by itself to see what happens. I suppose I could rig up something and leave it there using min/max?Comment
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Re: Lg 50pk950 turns on by itself (stumped!)
Key1 or key2 pin carry signal to turn on. I would find which key and monitor it in min/max to see if the turn on signal is coming from key/sub circuitI assume no responsibility for any stupid suggestions I might post.Comment
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Re: Lg 50pk950 turns on by itself (stumped!)
I think the problem has been found. After doing all the monitoring of the key1 pin on the SUB board and finding that the voltage would randomly dip I checked the 3.3v stby pin on the SUB board, which was also dipping randomly. Then I checked the 3.3v stby at the power supply itself and found it is dipping there, too, and logically would be the source of the aberrant voltage issue, which in turn is causing the SUB board to think it should turn the TV on. So, the answer: bad power supply board. I'm going to see if the board has bad caps or a problem with it's controller IC, since these boards are scarce and/or a little spendy.Comment
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Re: Lg 50pk950 turns on by itself (stumped!)
Hope you've nailed it.
Willing to help but I'm no expert.Comment
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Re: Lg 50pk950 turns on by itself (stumped!)
In case this helps anyone else, this case was solved! Ended up being C305 on the power supply board (22ufd@450v) electrolytic capacitor causing the 3.3v stby to be unstable and intermittently trigger self-turn on when it dipped too much and returned to normal. Replaced it and all is well!Comment
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Re: Lg 50pk950 turns on by itself (stumped!)
Glad it's fixed. Thanks for feedbackI assume no responsibility for any stupid suggestions I might post.Comment
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Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
All left and right refers to looking from rear of TV (or looking from front with TV upside down)- TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
- Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
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 guys great forum glad to have found it. I bought a Sony XBR 65X900C cheaply because it didn't work. No signs of life at all not even a light/led. All I hear is a brief high voltage sound when I throw the power to it.
Didn't see any obvious signs of damage so right away started checking voltages. This is what I see:
Power Board Connector that goes to Main board
CN6401
Pin 01 NC
Pin 02 NC
Pin 03 "BL_ON": 0V
Pin 04 "N/C"
Pin 05 "STBY 3.3V": 3.5V
Pin 06 "GND": N/C
Pin 07 "AC_OFF"...
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