Question about Flat Panel Televisions
I have the same old problem, no backlight on lcd tv, it turns on for half a second when I power up the tv.
Now I need to know what to replace in there, if you can give some more detailed infos, maybe a general scheme.
My email address is email@example.com
Warning: this method is not guaranteed to work, and performing it can damage your inverter board. I can't find the post from the guy who actually came up with this solution but it requires soldering in an LED, so here's what I did:
- You need to disassemble the TV to get to the large inverter board on the right side (when viewed from the back). This is a cumbersome process, requires removing all of the plastic housing screws (the speaker grill covers can be pulled off to reveal the screws on the front side), removing the power supply cover and power brick, removing the component connector module, removing the TV tuner module, removing the plastic housing (be careful to remove the power switch circuit on the bottom and the TV control circuit on top), removing the motherboard shield, disconnecting the LCD controller harness in the smaller opening towards the bottom, disconnecting the speakers, detaching the power lines to the inverter board (under the foil shield), then removing the screws on the front side of the LCD panel so that you can pull the shield off.. Do not remove the inverter board.
- On the inverter board there is a 20-pin IC near the power connectors, middle of the left side of the board. Pin 1 is the top pin on the left side of the circuit (small indentation in the carrier), pin 10 is the bottom on the same side.
- I bought a 1.8V red LED from Radio Shack. The hot lead is the longer one, you will need to bend the end of it so that it will hook underneath pin 10 on the IC without touching pin 9. Hook the pin and apply a little solder to secure it.
- Bend the LED leads so that you can ground the free lead to the shield when you put the screw back in. Make sure that you don't let either lead touch any other parts of the circuitry, a little electrical tape should protect things but the leads are stiff enough that if you bend them nicely you can avoid any problems.
- You will then have to partially reassemble everything so that you can connect the power brick and the component and tuner modules. Fire the TV up, you should get a blue screen. If it still only flashes you may have put the LED in backwards, or there is some other problem with the inverter or television.
- Reassemble the TV and enjoy.
Posted on Jan 08, 2009
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