Insignia NS-LCD32 powers on but blank screen & no sound, need help troubleshooting

[budm]

Re: Insignia NS-LCD32 powers on but blank screen & no sound, need help troubleshootin

We will still need to know if you get the power to the T-CON or not.

[omegastrm]

Re: Insignia NS-LCD32 powers on but blank screen & no sound, need help troubleshootin

I checked each end of the F1 green fuse on the T-Con board and its getting 5 volts on each end.

[budm]

Re: Insignia NS-LCD32 powers on but blank screen & no sound, need help troubleshootin

I wonder now if the main board is sending any signals to the T-CON, or the new T-CON is not good. You will have to use the Oscilloscope at this point to look at the LVD signals feeding the T-CON to see if there are any activities at all.

[omegastrm]

Re: Insignia NS-LCD32 powers on but blank screen & no sound, need help troubleshootin

can I just check the voltage on the cable wires going out from the mainboard into the tcon board?

[budm]

Re: Insignia NS-LCD32 powers on but blank screen & no sound, need help troubleshootin

The LVD signals are high frequency in the Mega Hertz range that you AC meter does not have the bandwidth to be able to measure. You can try to locate the LCD panel model number to look for the spec sheet to show us what the pins are on the T-CON board, then you can try using the meter to see if it may or may not show any action on the meter.

[omegastrm]

Re: Insignia NS-LCD32 powers on but blank screen & no sound, need help troubleshootin

I will try to find out the panel model number tomorrow. I think I have to unscrew a couple of bolts to take off the boards and reveal it.

On a side note, I measured voltage going in from the power supply to the main board and there were two wires that were getting a lower amount of voltage (11.55v) rather than the 12v that it stated on the board, versus others wires that were getting a little more than the recommended voltage i.e. a 24v wire was getting 24.3v, which seems ok.

is that .5v deficit a possible problem or no?

[diodo49]

Re: Insignia NS-LCD32 powers on but blank screen & no sound, need help troubleshootin

I want to know...

[budm]

Re: Insignia NS-LCD32 powers on but blank screen & no sound, need help troubleshootin

No, the 12 will be fed to a bunch of voltage regulators and regulated switching power supplies on the T-CON board, the 12v power supply is also used for Audio amplifiers which can tolerate voltage variation.

[omegastrm]

Re: Insignia NS-LCD32 powers on but blank screen & no sound, need help troubleshootin

alright so I got me another main board and currently returning the first one i purchased. It turns out the first mainboard that i got had two end digits off even though it was advertised as the board that I needed with the correct pn.

Thats my fault so my lesson is learned: NEVER RELY on others to be accurate. Even if it looks identical and most of the numbers match up. Make sure that that it is the EXACT one that you need!

Once installed I got a picture, however I encountered a new problem with this next main board: the screen is grainy and has a weird color distortion to it as shown in the pictures. Now i can return it or if anyone has a solution as to any possible component failure inside the main board thats causing this, i'd love to hear it.

[beamus]

Re: Insignia NS-LCD32 powers on but blank screen & no sound, need help troubleshootin

so bottom line is after all purchasing the "t-con board" was the best bet. I have the same problem with this type of TV. The power goes on, but nothing shows on the screen. It was given to me that way.

I am thinking on taking it to be fixed, but it not too sure.

Don't have all the equipment for testing...