Working on a Vizio 320E that has issues with the main board. The main IC U12 gets extremely hot. Wondering if anyone else has had this same problem? How can I confirm it's the main IC. Also has anyone else ever tryed to change this IC? Saw them on eBay for $15.50.
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Re: Vizio VO320E main board
Since you post no pictures and I don't have clairvoyance have no clueI assume no responsibility for any stupid suggestions I might post.Comment
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Re: Vizio VO320E main board
https://www.badcaps.net/forum/attach...1&d=1496523291
Sorry about that. Let me know if you need better pictures.Attached FilesComment
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Re: Vizio VO320E main board
Looks like main processor. Surprised you can buy it. What are issues? How hot? Is that why you removed heatsink? Did it have thermal pad on it?I assume no responsibility for any stupid suggestions I might post.Comment
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Re: Vizio VO320E main board
I did remove the aluminum heatsink because I wanted to see the part number on the main IC. It gets very warm.
With in 50 to 60 seconds you can't touch it. I first thought it was U2 voltage regulator because the voltage reading on the output pin was .17 volts and it was also very hot, I change it but nothing changed. I'm thinking that's because something else in the circuit is shorted.Comment
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Re: Vizio VO320E main board
Might want to remove U2 and check for short on output trace. See where trace is runningI assume no responsibility for any stupid suggestions I might post.Comment
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Re: Vizio VO320E main board
I have already change U2 voltage regulator and it still gets hot because something else in circuit is shorted. Does anyone out there have a schematic for this TV?
I realize this TV isn't worth much money.Last edited by shadetreetrader11; 06-03-2017, 04:39 PM.Comment
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Re: Vizio VO320E main board
Reread my postI assume no responsibility for any stupid suggestions I might post.Comment
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Re: Vizio VO320E main board
I'm sorry I miss read your post. Yes output pin to ground is 0 ohms dead short.Comment
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Re: Vizio VO320E main board
You will need to run that trace and check components for short. If it runs to main processor with no shorted components between then I hope you have good soldering skills.I assume no responsibility for any stupid suggestions I might post.Comment
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Re: Vizio VO320E main board
I ordered a main board off ebay because we're getting pretty deep here. So just for fun I took my hot air gun and removed the main IC and the short to ground remained. (which really surprised me because that IC was getting so terrible hot) So then I removed IC U39 and then the short to ground was gone. It now reads 270 ohms to ground. So at this point I guess I really don't know what to say.Comment
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Re: Vizio VO320E main board
U39 looks like hdmiI assume no responsibility for any stupid suggestions I might post.Comment
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Re: Vizio VO320E main board
Well new board should fix itI assume no responsibility for any stupid suggestions I might post.Comment
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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... -
Hi everyone,
Iām looking for help with a persistent issue on an LG TV model 55NANO77SRA, which uses the main board EBU66792103 (also used in LG UQ80 and NANO75/NANO80 series).
š§© Problem Summary:- The TV keeps scrolling through the menu or selecting items by itself.
- I removed the physical button board (the entire panel with power and volume buttons) and also disconnected the flat cable (CN202) from the main board.
- The remote control is not in use (batteries removed), and the TV still shows the same behavior.
- I
07-28-2025, 08:34 AM -
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"... -
ONN 100012588
Issue: No Power, Then Rebooting After Main Board Change
Short answer: replace main board and power board
Technical answer: replace main board and Q306 & Q307 on power board.
Long answer:
TV wouldn't turn on. Power switch was fine which means the main board isn't processing the power on signal. Replaced main board. TV turns on now but randomly reboots. Bad main board? EEPROM? Tried to pull main board and got a shock touching the corner of the board. That's weird. C334 (450V 10uf) capacitor is still holding a high charge.... -
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...
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