Insignia NS32L450A11

[ivtec]

Hi guys; i picked this tv up and opened it up and found out Fuse and a Scott y Diode short circuit and out of the circuit it's Open,could it be more parts bad? send you Pic of Power Supply,and the Diode Sckoty it's T2D- 02,what other similar can i use?Thanks
http://www.donberg.ie/catalogue/semi...t-tc/t_2d.html

[ivtec]

Re: Insignia NS32L450A11

Hi folks I've red these two threads bellow and does this Diode T 2D 02 will measure open out of the circuit ?and in circuit short ,is it OK?

https://www.badcaps.net/forum/showthread.php?t=23233


https://www.badcaps.net/forum/showthread.php?t=43724

[R_J]

Re: Insignia NS32L450A11

U501 could be bad, look up it's pdf, I suspect the built in fet is shorted, pin 6 will be missing on the ic, check between pins 5 and 7 and see if it is shorted
That should be the standby circuit, do you have standby voltage?

[ivtec]

Re: Insignia NS32L450A11

U501 could be bad, look up it's pdf, I suspect the built in fet is shorted, pin 6 will be missing on the ic, check between pins 5 and 7 and see if it is shorted
That should be the standby circuit, do you have standby voltage?

Thanks R_J; i have no standby volts because the Main fuse is bad, U501 pin 5 to 7 is not short.Should i put the Schotty diode in place and the main fuse in and try?

[R_J]

Re: Insignia NS32L450A11

I guess you could, or use a light bulb in series with the fuse or ac line for some protection. It could be that the standby is ok but as soon as the main power supply is turned on it shorts and blows the fuse.

D501 is in parallel with the transformer winding so it will measure short in circuit
Did you check Q101 and Q102?

[ivtec]

Re: Insignia NS32L450A11

I guess you could, or use a light bulb in series with the fuse or ac line for some protection. It could be that the standby is ok but as soon as the main power supply is turned on it shorts and blows the fuse.

D501 is in parallel with the transformer winding so it will measure short in circuit
Did you check Q101 and Q102?

Thanks J_R; you were right it blew the fuse again,and i checked Q101,Q102 and i think they are OK both measure same ,check the pic attach.

[Relayer]

Re: Insignia NS32L450A11

Hello ivtec,
Measuring the diode in-circuit may be giving you a false reading, as the diode is sitting
across the primary of the switching Xformer.
Have you measured across the tranny with the diode out of circuit?
If you find it shorted, then its more than likely normal, as you'd be measuring the
transformer winding's.
Check ZD503. Lift one leg out of circuit when measuring and ensure you do a punch-through test when you reverse bias it.
Measure across the main filter cap to see if there's any shorts.
If there is a short, you need to check the bridge rectifier.
Please let us know how you get on.
Regards,
Relayer

[R_J]

Re: Insignia NS32L450A11

Check va101, make sure it's not shorted, check the bridge rectifier, make sure it has no shorts, Check R522, if it is ok (less than 1 ohm) then I suspect U501 is ok.

[budm]

Re: Insignia NS32L450A11

You mean the VS101 surge protector that is connected in parallel with the Bridge AC input pins?

[ivtec]

Re: Insignia NS32L450A11

Check va101, make sure it's not shorted, check the bridge rectifier, make sure it has no shorts, Check R522, if it is ok (less than 1 ohm) then I suspect U501 is ok.

Thanks R_J ; i checked VA101 in circuit and it's shorted but out of circuit it's not short, ,R522 it's 2.8 ohms the bridge rectifier it's ok,now the U501 that don't know.

[budm]

Re: Insignia NS32L450A11

How about VS101 (TVS diode), that is also connected between Line and Neutral after the fuse.

[R_J]

Re: Insignia NS32L450A11

If the location of va101 is shorted then there is a short across the ac line somewhere between the main plug and the bridge, like budm said, check vs101 and if it's ok remove cx101 and check it

[ivtec]

Re: Insignia NS32L450A11

How about VS101 (TVS diode), that is also connected between Line and Neutral after the fuse.

Thanksguys ; VS101 is short in circuit and out of circuit,i thought vs 101 was a fuse! sure looks like one ,but looking at it on the other side it has a symbol of a zener diode,i also took out CX101 in circuit it shows short but out of circuit it's not short,

[R_J]

Re: Insignia NS32L450A11

ok, thats good you found it, You should be able to try the power supply, it will work without that part but it should be replaced.

[ivtec]

Re: Insignia NS32L450A11

ok, thats good you found it, You should be able to try the power supply, it will work without that part but it should be replaced.

Thanks J_R;Is there any equivalent part to replace that VS101? i have many power boards in my scrap, maybe i will find one that fits there,thanks in advance

[budm]

Re: Insignia NS32L450A11

No numbers at all on the body of that TVS Diode?

[R_J]

Re: Insignia NS32L450A11

On the S.J. picture I can make out "E2"

[ivtec]

Re: Insignia NS32L450A11

Hi Sorry folks;here VS 101 - SR8K P6KE220CA ,thanks



http://www.littelfuse.com/products/t...p6ke220ca.aspx

[R_J]

Re: Insignia NS32L450A11

P6KE220CA is the number, all suppliers have it https://www.digikey.com/product-deta...CA-CHP/4070001

[ivtec]

Re: Insignia NS32L450A11

P6KE220CA is the number, all suppliers have it https://www.digikey.com/product-deta...CA-CHP/4070001

Thanks R_J; appreciate all your help,will post results.