SAMSUNG BACKLIGHT FAULTY but audio ok

[lanada]

I have a Samsung 32'' model:LE32A430T1 with a faulty backlight, after switching the power on the backlight presents for 1 second and then backlight switch's off, but the audio works fine.

I checked for fuses and capacitors on the inverter board (CMO E74060) but they are fine,

Can some one guide me ?

Thanks
Lanada

[budm]

Re: SAMSUNG BACKLIGHT FAULTY but audio ok

Pictures of the whole backside of the TV that shows all the boards so we can see what we are dealing with?

[lanada]

Re: SAMSUNG BACKLIGHT FAULTY but audio ok

Thanks for you replay

Attached you can find my panel at the back

Regards
Lanada

[budm]

Re: SAMSUNG BACKLIGHT FAULTY but audio ok

OK, it uses CMO inverter board.
I need the straight shot pictures of the inverter board so I can tell you which pins on the inverter transformers you need to check the high Voltage winding resistance to see of the inverter transformers are OK or not.
Also provide the P/N as printed on top of the inverter transformers.
BTW, there are more than one versions of the inverter board I315B1-16A:
http://www.shopjimmy.com/catalogsear.../?q=i315B1-16A
So please indicate which one that you have, they all look the same but the P/N are not the same.

[ReeceyBurger123]

Re: SAMSUNG BACKLIGHT FAULTY but audio ok

Probably the transformers.

[dick_barton]

Re: SAMSUNG BACKLIGHT FAULTY but audio ok

There is a thread on the site which could be useful for testing the inverter.

https://www.badcaps.net/forum/showth...ghlight=oz9966

[lanada]

Re: SAMSUNG BACKLIGHT FAULTY but audio ok

Hi to all

Attached you can find the p/n of inverter and a closer pic of a high voltage transformer

Thanks
Lanada

[budm]

Re: SAMSUNG BACKLIGHT FAULTY but audio ok

OK, I see at least 5 fuses (F1 ~F5) and may be more, you need to check and see if they are showing <1 Ohm or so.
Here is the pinout of the transformers, check the resistance of both windings (S1 & S2, S3 & S4) of each transformer, they all should be within 3% from each other.
http://lcdparts.net/TransformerDetai...ProductID=3497

Pictures provided by LCDPARTS.NET

[lanada]

Re: SAMSUNG BACKLIGHT FAULTY but audio ok

the fuses form f1 to f5 are all good. About transformers I checked with ohm meter and they are approximately with the same value of 1kohm.

checked also Tubes with an external ccfl tester and they looking good, I think their was a problem with the IC OZ964??

Is their any disable pin for the error on IC OZ964???

Thanks
Lanada

[martino]

Re: SAMSUNG BACKLIGHT FAULTY but audio ok

check U10,U11,U12 etc for shorts.... The transformer side you can see all legs connected,the other side goes to a few things,put multimeter on beep mode(so it beeps when probes touch)and put one probe on transformer side of those IC's and run other probe over the other side legs,you should not hear a beep,there will probably be one group of IC's that do beep,take one IC off and measure the others,you will find the defective one

[dick_barton]

Re: SAMSUNG BACKLIGHT FAULTY but audio ok

the fuses form f1 to f5 are all good. About transformers I checked with ohm meter and they are approximately with the same value of 1kohm.

checked also Tubes with an external ccfl tester and they looking good, I think their was a problem with the IC OZ964??

Is their any disable pin for the error on IC OZ964???

Thanks
Lanada

Post #22
https://www.badcaps.net/forum/showthread.php?p=648896