You gonna sell a tape TV?
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This one was more or less a proof of concept and personal achievement š
The ones I DO sell I've either replaced power supply components, boards, or most commonly, backlights. On rare occasion I get one that has nothing wrong with it at all.. And those are the ones I can't guarantee anything AT ALL.
But as far as used TVs go, they're just the same as used cars. You can put a new transmission in a car and sell it but 6 months later a head gasket goes. I may put a new power supply in a TV but I can't guarantee that the backlights won't fail next week. That's why I will honor my work and my customers for a respectable length of time.. but obviously not forever.
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I don't have a picture of what I did. What I suggest is you find the clock signals yourself and then block them with tape. The way I found them was by looking at the main board and finding the labels near the ribbons. When I found CLK1 thru CLK8 (I believe it was) I followed the trace to the ribbon connector. Using a multimeter in continuity, place one probe on the the pin of the connector and run the other probe along the pins of the opposite side of the ribbon (the end that plugs into the strips on the panel) until you hear a beep. When it beeps you've found where that signal comes out on the other end. All you need to find is 1 and 8 then everything in between those are the remaining signals. Start by putting tape over all 8 and see what happens.
This is assuming your multimeter BEEPS when continuity is found.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... -
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.... -
Schematics for the main board needed please. Sticker on board states BN94-07517A but the silkscreen says BN41-02157B. Cant find here or anywhere on the web.
Backlights work when main boards disconnected. When connected and power button switched, the relay on the PSU board turns on for one second then back off.
While relay is on, all voltage rails are present and steady (scoped) on main board.
I love a good logic puzzle but getting lost without any schematics.
No shorts on ANY capacitor main board.
Thermal camera shows 3.3V inductor getting warm instantly but...10-19-2025, 06:32 PM
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