insignia ns50d40 dead

[ogtommy]

Hello everybody, I had a really bad experience today. my vga cable was stripped and it touched the metal case of a stereo that apparently wasn't grounded and it arced. before i knew what happened i went to unplug it and it arced again and all 3 tvs/monitors i had went dead. I killed the power and checked them 1 by one. One was dead dead. no power whatsoever. the 2nd one was still on but hdmi wasn't working. i tried vga and it worked. the 3rd one was my insignia tv. A dim little light was on but wasn't bright or off like it does when its on. I opened it up and checked the fuse. its still good. I checked pin 6 and 6 which are stby 5v and they are good. DOnt know where to take it from here. its feeding 5v to logic board but logic board not feeding back the turn on circuit. any way to trick it to check the power board and then i can concentrate on the logic board? anything i should check like test points?
please feel free to ask anything and i will gladly appreciate any help
thank you
tommy

[budm]

Re: insignia ns50d40 dead

We need good clear straight shot pictures of the top and bottom side of the boards and the whole backside of the TV showing all the boards.

[ogtommy]

Re: insignia ns50d40 dead

Ok so i had boards out for testing so i just placed on tv where they go. The pic showing the connector is just to show the pinout incase it didnt turn out good in the other pic.
Btw i read ur troubleshooting guide. Very informative. My tv doesn't have 24v but i guess 2 x 12v =24v?
If any better pics are needed or any specific area i can take alot more
Thank u

[ogtommy]

Re: insignia ns50d40 dead

does anybody know how the logic board triggers the power supply board to turn on the rest of the power suplly voltages? i have a pic of all the labels for the signals going from the power board to logic board

[budm]

Re: insignia ns50d40 dead

https://www.badcaps.net/forum/attach...8&d=1512087801
you need to post the DC Voltage readings of all those pins so we can see what it has and doesn't have when TV is OFF and when Power switch is activated.
You must put down the pin name and follow by the Voltage reading for each pin so it will be easy for us to see the result.
BTW, all the boards will have to be connected back in place.
The power supply only has two power supplies: 5VSTBY and switched 12V.
At this point I suspect the main board.
How do you have 3 TV and VGA cbales, HDMI, and anything else connected together?
The stereo receiver has two prong so it is the double-insulated power system so for it to arc it may have bad Y caps, or since the case is the circuit GND and if it has connection to other component that has safety GND then the fault current will flow through the GND wire of the signal cables to the safety GND which is more likely to be the cause of the problem to take out HDMI chips, etc.

'my vga cable was stripped' Can we also see the pictures of this cable?

[ogtommy]

Re: insignia ns50d40 dead

my tv will not turn on, only a faint dim red led that was bright before. i tried pushing the power button none the less after i tested all the pins but no difference

pin# voltage
1 - 4.093v
2 - 0.025v
3 - 1.535v
4 - 4.575v
5 - 0v
6 - 5.065v
7 - 5.065v
all the rest are 0v

[budm]

Re: insignia ns50d40 dead

my tv will not turn on, only a faint dim red led that was bright before. i tried pushing the power button none the less after i tested all the pins but no difference

pin# votlage

We need to know what the Voltages are. It does not matter if there is no change or not, we need to know what they are period since you do not understand how the TV works so you must provide us the DATA.

[budm]

Re: insignia ns50d40 dead

my tv will not turn on, only a faint dim red led that was bright before. i tried pushing the power button none the less after i tested all the pins but no difference

pin# voltage
1 - 4.093v
2 - 0.025v
3 - 1.535v
4 - 4.575v
5 - 0v
6 - 5.065v
7 - 5.065v
all the rest are 0v

Where are the name of the pins that I request?

[ogtommy]

Re: insignia ns50d40 dead

Sorry bout that, here goes:

1: DIMMING 4.093VOLTS
2: BL_ON 0.025VOLTS
3: PWR_ON 1.535VOLTS
4: ACD 4.575VOLTS
5: DET 0VOLTS
6:5.1V_STBY 5.065VOLTS
7:5.1V_STBY 5.065VOLTS
8:GND 0VOLTS
9:12.5 0VOLTS
10:12.5 0VOLTS
11:GND 0VOLTS
12:GND 0VOLTS
13:12.5 0VOLTS
14:12.5 0VOLTS
15:GND 0VOLTS
16:GND 0VOLTS

[budm]

Re: insignia ns50d40 dead

OK, so you do have PS-ON but the 12V does not come on.
The BL-ON is also not present so the backlights circuit will not come on.
You do have Dimming control signal.
So you have two problems: The main board is not sending the BL-ON, and the power supply is not putting out the switched 12V.
At this point you need to get the 12V power supply working first so it will need in depth troubleshooting down to component level, it is not going to be easy due to no schematic available.

[ogtommy]

Re: insignia ns50d40 dead

reading the guides you posted for tv troubleshooting, would the 12v come on after the logic board recieves the 5.1volt signal that is already present and then tell the powersupply board to switch it on, or am i missing something? are the 12v always present on the powerboard? or does the logic board have to turn them on? I have an oscilloscope and i have a frequency generator and a logic analyzer. it's been a long time since ive used them and an even longer time since i cared to. If someone can explain to me the order of the way things work i can take it from there. What i thought from reading your guide was that the tv powersupply 5volts stays always on and when it recives a signal from the logic board (from power button or ir remote) telling it TURN ON it switches on the rest of the supplies and tv works.
Now, my tv got fried through the hdmi connector as stated in post 1. my vga cable on monitor 3 of 3 was stripped and touched electricity sending current through my video card to 2 other monitors both through video card. 1 works only on vga so im using my buspirate to rewrite the edid but my insignia tv is dead. either way current went through hdmi ground to the logic board? damage done to logic board? anyway to test logic board? i have soldering iron with ir plate and heat gun for reballing. can i fix this or am i wasting my time? i think the logic board is dead but im a newbie at tv's so im hoping the more experienced users like yourself can help.

[ogtommy]

Re: insignia ns50d40 dead

Does anyone know how to mimic the turn on signal ? it seems power_on is kind of low for a ttl level signal but DET (which ill guess means detect) is missing for triggering completely which leads me to believe it triggers the powersupply?
any useful input would be appreciated

[ogtommy]

Re: insignia ns50d40 dead

if the 5.1v_stby powers the logic board and the logic board is broken would it then not trigger the power board from giving the 12v signal and bl_on? instead of worrying about the 12v power missing from the powerboard would i not have to figure out why the logic board is not telling the powersupply from turning on the 12v and the BL_ON? im just guessing here but hoping i stumble towards the right direction with some help

[Relayer]

Re: insignia ns50d40 dead

Hello ogtommy,
Could you please look at your modified picture below:



Can you please check the voltage on the arrows indicated. What volts, if any, do you read?
If there is nothing there, then we need to track back.
But if voltage is present, then you need to check the fusible (safety) resistor shown in the red box. Also check those two zener diodes. You may have to lift one leg to get an accurate reading.
Also, could you please provide the numbers/letters of the IC indicated in green.
Please let us know how you get on.
Regards,
Relayer

[ogtommy]

Re: insignia ns50d40 dead

thanks for help relayer,
i measured all the points but i didnt lift the legs. if needed i will but let me give you voltages first.
measuring vac from Line to ds1 was 202V
measuring vac from line to resistor was 56.8V left side and 62.8V right side
measuring vac from line to zds1 was Anode 62.4V cathode 62.7V
measuring vac from line to zds11 was anode 56.1 cathode 62.3V
The ic is an a6069h heres the pdf https://cdn.badcaps-static.com/pdfs/...ae6914545d.pdf

[ogtommy]

Re: insignia ns50d40 dead

anything else i can do to help shed some light let me know.
thanks again for the help

[budm]

Re: insignia ns50d40 dead

thanks for help relayer,
i measured all the points but i didnt lift the legs. if needed i will but let me give you voltages first.
measuring vac from Line to ds1 was 202V
measuring vac from line to resistor was 56.8V left side and 62.8V right side
measuring vac from line to zds1 was Anode 62.4V cathode 62.7V
measuring vac from line to zds11 was anode 56.1 cathode 62.3V
The ic is an a6069h heres the pdf https://cdn.badcaps-static.com/pdfs/...ae6914545d.pdf

No need to bother with that section because you DO HAVE 5vstby!
And BTW you are using the wrong GND for the deadly primary side of the circuit that is why YOUR dc Voltage readings are wrong in that section, you cannot use chassis GND or Line as the GND point, the GND point fo the primary circuit is the negative leg of the main filter cap.
What ever you do, do not not touch anything in the primary side with your hands or your body!

[budm]

Re: insignia ns50d40 dead

I need straight shot high res. pictures of the whole top and bottom side of the power supply board.

[ogtommy]

Re: insignia ns50d40 dead

comming up in 2 mins. Ill get a better cam with less glare

[budm]

Re: insignia ns50d40 dead

Hello ogtommy,
Could you please look at your modified picture below:



Can you please check the voltage on the arrows indicated. What volts, if any, do you read?
If there is nothing there, then we need to track back.
But if voltage is present, then you need to check the fusible (safety) resistor shown in the red box. Also check those two zener diodes. You may have to lift one leg to get an accurate reading.
Also, could you please provide the numbers/letters of the IC indicated in green.
Please let us know how you get on.
Regards,
Relayer

The 5VSTBY is present! See post #9.