No Picture or Audio on Insignia NS-LCD26

[adlegs]

I have a Insignia NS-LCD26 that has this issue and I have tried reballing the Main Board to see if it would correct the issue. I used a heat gun the first time and the Tv started working but only for a few days... I baked the entire Main Board 3 weeks ago and thought it had fixed it for good but it stopped working today My question is should I replace the Main Board (6HA0086911) or could something else possibly be causing this issue??

Thanks for any feedback!!

[budm]

Re: No Picture or Audio on Insignia NS-LCD26

Voltage output of the power supply should be verified first, if the voltages are wrong, lots of strange/intermittent problem can show up.
http://s807.photobucket.com/albums/y...NS-LTDVD26-09/

[adlegs]

Re: No Picture or Audio on Insignia NS-LCD26

I checked all of the voltage outputs from the power supply and they seem to be good. I can check them again. I also notice a slow startup around 9-10 seconds before the video shows on the screen and also sometimes the TV needs input before it would turn on.
Dont know if these additional symptoms help or just make it more confusing... Thanks for the input I will check the outputs from the PWB again.

[budm]

Re: No Picture or Audio on Insignia NS-LCD26

That is a strange symptom indeed. I have not run into this problem before in this model. The 3 I fixed all have bad caps.

[adlegs]

Re: No Picture or Audio on Insignia NS-LCD26

Thanks for the reply! I will double check the PWB.

[adlegs]

Re: No Picture or Audio on Insignia NS-LCD26

bubm,

Yes t is strange that when I attempt to reball the video chip by heating to to 385 degrees for 10 or so minutes the set works fine for a while. I was wondering about the startup time... is 8-10 seconds before I get a picture normal for thos model?? also is it normal that the TV needs input before it will show video?? what I mean by that is I have a cable box hooked up to a HDMI input and if the box is off the TV video will not come on. I have to turn off the TV then turn on the cable box and then turn on the TV??? Thought that was kinda strange...

[infringer]

Re: No Picture or Audio on Insignia NS-LCD26

Sounds to me like your video board may need a replacement after cooking it in your oven you are not reballing anything by heating it up you are essentially reflowing I suppose but anyone will tell you with these types of fixes in order to get it to work you may need to truely reball the unit rather then hoping that heat magically gets rid of all of your tin whiskers as it rarely works for extended periods of time.

PS I need to know some stuff about your power board if you could help me I have this same TV and the SMT chip on the bottom blew off and I need the part number for this chip if you could help by giving me this info it would be great.

Check out the thread that I started and help if you can.

Thanks!

[infringer]

Re: No Picture or Audio on Insignia NS-LCD26

The thread is located here: https://www.badcaps.net/forum/showthread.php?t=23169

The item I am referring to is on the bottom of the power board.

Looking at the picture it is marked 24v SMPS IC
https://www.badcaps.net/forum/attach...9&d=1350273088

[freakaftr8]

Re: No Picture or Audio on Insignia NS-LCD26

Are you getting back lights? I worked on a Westinghouse 47" that had an intermittent connection failure in the socket for the lvds cable that goes to the tcon. The odd thing is that with the bad connection it killed the 5v from the ps. Thus halting all controls and no picture backlight or video.

[adlegs]

Re: No Picture or Audio on Insignia NS-LCD26

My screen is completely black no lights...

[adlegs]

Re: No Picture or Audio on Insignia NS-LCD26

Infringer.... I am going to take it down and look tonight and I will reply with the number.

[infringer]

Re: No Picture or Audio on Insignia NS-LCD26

Did you get a fairly intense flashlight and shine it on the screen in the center and hit the menu button? You will see the picture if it is there with a good flashlight...

[adlegs]

Re: No Picture or Audio on Insignia NS-LCD26

No but I had the back of the TV off and could see the LCD from the back and it does not light up. When it does I am able to see light from the back. But I will try the flashlight and see. Thx!

[infringer]

Re: No Picture or Audio on Insignia NS-LCD26

shine the flashlight on the front of the screen in a semi lit room and look hard a dark room is better just be careful if you have the back of the TV off not to touch the power boards... Yes I know you can see the LCD from the back we are trying to see if the screen is still functioning here and your backlight is out or just not starting this is just a simple test really and should be done any time your power comes on and you don't have a picture it is always good to know that the screen is still functional before you dump money and time it to it as it is the most expensive part of the unit so if you can confirm this it will be advantageous for you but not all times does the unit have a picture a frozen picture a half of a picture or no picture or lines may indicate a timing control failure. So keeping this all in mind the flashlight check is handy and should be considered as part of the procedure.

Thanks by the way for taking the time to look for them chip numbers ahead of time it'll save me some time.

[adlegs]

Re: No Picture or Audio on Insignia NS-LCD26

I checked the LCD with a flashlight and do not see anything.... it looks totally black. also my PWB does not look like your pics?? what is the number on the board by the chip?

[adlegs]

Re: No Picture or Audio on Insignia NS-LCD26

Here are some closeups

[adlegs]

Re: No Picture or Audio on Insignia NS-LCD26

pic 1170 - 165A
PDLC

pic 1169 - 431AC
(TI emblem) 75M
CJ06 G4

[infringer]

Re: No Picture or Audio on Insignia NS-LCD26

The unit does power up though correct? If so what are all of the voltages at the power connectors take voltages of everything in standby and when powered on and report all of the voltages here like so...

+5v Standby xx.xxv On xx.xxv
+12v Standby xx.xxv On xx.xxv
+24v Standby xx.xxv On xx.xxv
on/off Standby xx.xxv On xx.xxv
psu on Standby xx.xxv On xx.xxv

This will help leave a little better indication.

Also check all your SMT fuses on your inverter board.
Check all your SMT fuses on your TCON
Check all your SMT fuses on your Main Board.

There should be a fairly nice amount of SMT fuses in this TV.

This would be a great starting point for you to fix the problem there needs to be some electronic indication of where it may be coming from whether it is a fuse or voltage irregularities or something but you surely will need to provide more info at this point.

[budm]

Re: No Picture or Audio on Insignia NS-LCD26

Can we see good clear pictures of both sides of the power board? Also, what is the full model number of this TV, Insignia will have the main model number and follow by the - xx for the year.

[adlegs]

Re: No Picture or Audio on Insignia NS-LCD26

The unit does power up though correct? If so what are all of the voltages at the power connectors take voltages of everything in standby and when powered on and report all of the voltages here like so...

+5v Standby xx.xxv On xx.xxv
+12v Standby xx.xxv On xx.xxv
+24v Standby xx.xxv On xx.xxv
on/off Standby xx.xxv On xx.xxv
psu on Standby xx.xxv On xx.xxv

This will help leave a little better indication.

Also check all your SMT fuses on your inverter board.
Check all your SMT fuses on your TCON
Check all your SMT fuses on your Main Board.

There should be a fairly nice amount of SMT fuses in this TV.

This would be a great starting point for you to fix the problem there needs to be some electronic indication of where it may be coming from whether it is a fuse or voltage irregularities or something but you surely will need to provide more info at this point.

I am checking the voltages your suggested now. Did the pics I uploaded help you?
If it was a fuse blown does the fuse reset? I have heated the video chip 3 times in an attempt to reseat the chip and each time the TV works but only for a few days then no video. The TV sounds like it powers on and I get a green power on light but I have to hold the power button for 5 seconds to turn it off. If a fuse was blown wouldn't it stop working for good until the fuse was replaced?