Samsung le37b530 no backlight

[tom66]

Re: Samsung le37b530 no backlight

Remove DP805 to confirm reading out of circuit.
DP804/DP810 aren't shorted but I'm confused by their reading, maybe try again with DP805 out of circuit.

Diode mode is correct for testing.

[hey_monkey]

Re: Samsung le37b530 no backlight

If diodes are good it's probably the IC. .

Are the FAN7529/FAN7530 IC you were talking about are the same as the one just tested (UP801S)? and UB802?

[tom66]

Re: Samsung le37b530 no backlight

Are the FAN7529/FAN7530 IC you were talking about are the same as the one just tested (UP801S)? and UB802?

It is UP801S. But if the diode is bad, the IC may not be causing the fault.

[hey_monkey]

Re: Samsung le37b530 no backlight

ok, the iron is warming up

[hey_monkey]

Re: Samsung le37b530 no backlight

OK, with one leg of DP805 in the air i have:
for DP804 it shows me infinite in one direction and 600 in the other
for DP805 it shows me 002 in one direction and 002 in the other
for DP810 it shows me infinite in one direction and 600 in the other
So i just have to replace DP805?

[budm]

Re: Samsung le37b530 no backlight

"for DP805 it shows me 002 in one direction and 002 in the other" Check this one in Ohm mode and report the reading, make sure to give us the reading if it is in OHM, K OHM, or M OHM.
Oops, TOM got it already.

[hey_monkey]

Re: Samsung le37b530 no backlight

1.8 ohm in each direction

[budm]

Re: Samsung le37b530 no backlight

It is bad, it is no longer acts like semicondcutor.

[hey_monkey]

Re: Samsung le37b530 no backlight

can you advice me on a replcement piece?

[budm]

Re: Samsung le37b530 no backlight

Please see what is printed on DP805. 31GF6L-5705?
Is the print on the body showing that?

[hey_monkey]

Re: Samsung le37b530 no backlight

It is bad, it is no longer acts like semicondcutor.
I would replace both of them, 804, 805.

and not the 810?

[hey_monkey]

Re: Samsung le37b530 no backlight

They (804, 805) are 1N5408.

Mine says MUR360AX / SSG0908I for 805

and 1N5408 for 804 and 810

[budm]

Re: Samsung le37b530 no backlight

OK, MUR series diode, MUR360A.
http://pdf1.alldatasheet.com/datashe...TC/MUR360.html

[hey_monkey]

Re: Samsung le37b530 no backlight

can i replace the 3 with 3 1N5408?

[tom66]

Re: Samsung le37b530 no backlight

can i replace the 3 with 3 1N5408?

No, MURxxx is a high speed (fast recovery) device. 1N5408 are slow recovery devices.

[budm]

Re: Samsung le37b530 no backlight

31GF6 is the sub suggested by SAMSUNG.

[hey_monkey]

Re: Samsung le37b530 no backlight

where to find them?

[hey_monkey]

Re: Samsung le37b530 no backlight

Ok, i found on Ebay for 4 euros shipping included.

I will try and tell you,

Thanks a lot anyway to you two!

[budm]

Re: Samsung le37b530 no backlight

http://www.digikey.com/product-detai...ICT-ND/3711776
http://www.mouser.com/ProductDetail/...%252bQYA%3D%3D

[hey_monkey]

Re: Samsung le37b530 no backlight

hi,

31GF6 is there, it is installed and YES it is working! I have to go watch my tv... thank you guys!

H_M