samsung smd part number

[attainteddragon]

if anyone can help, im trying to locate a part number for a samsung ps50b550t2fxxxy, power board number p0850a rev 1.2
location number dm 806 and dm 807, underneath the relays rl801s and rl802s.
if anyone can help or point me in the right direction for these smd diodes, i will be forever grateful!

[tw2005]

Re: samsung smd part number

if anyone can help, im trying to locate a part number for a samsung ps50b550t2fxxxy, power board number p0850a rev 1.2
location number dm 806 and dm 807, underneath the relays rl801s and rl802s.
if anyone can help or point me in the right direction for these smd diodes, i will be forever grateful!

Not giving us much to work with. photos, part # of PSU? Are these diodes still identifiable, markings on the casing?

I don't know what part the board is , could be BN44-00274B.

Found this schematic for an "A" version which might be close enough or maybe grab a magnifier and look for some marking. Can't be sure the schematic is correct but may help.

I searched the doc for diodes numbered 806,807 plus the one in the cct connected to the relays kds181. maybe you can trace what they're connected to on the schematic and work it out.


DP805 & 806 on this board?

[attainteddragon]

Re: samsung smd part number

thanks for the info tw2005. ill have a look through it tomorrow.
found a marking on one of these from another board and all i can get from it is a2x on these smd's, and my suppliers cant seem to help me with this one! :/

[tw2005]

Re: samsung smd part number

thanks for the info tw2005. ill have a look through it tomorrow.
found a marking on one of these from another board and all i can get from it is a2x on these smd's, and my suppliers cant seem to help me with this one! :/

Sounds like fun, just like the numerous hours it took me to decypher some SMD on panasonic SC.

Even harder when you don't know the brand but if the schematic looks right around that part of the cct?

I don't like guessing much either. good luck

http://www.s-manuals.com/smd/a2 I don't trust what I saw for A2*

KDS184 is common cathode, these agilents are in series for A2*?

[tw2005]

Re: samsung smd part number

Maybe more pieces of the puzzle in this list I copied from what was listed for sale here

http://www.electronicsmarket.com.au/...page=4&sort=3d

DIODE-RECTIFIER;S1G,400V,1A,DO-214AC,TP 0402-001614

DIODE-SCHOTTKY 0402-001207

DIODE-SCHOTTKY;BAT721C,40V,200MA,SOT-23, 0404-001404

DIODE-SWITCHING;1N4148WS,75V,150MA,SOD-3 0401-001099

DIODE-SWITCHING;KDS184,80V,100MA,SOT-23, 0407-000114

DIODE-SWITCHING;LS4148,75V,150MA,SOD-80, 0401-001049

DIODE-SWITCHING;MMBD4148SE,100V,200MA,SO 0401-001056


DIODE-TVS 0406-001200

DIODE-TVS;RCLAMP0524P,6/-/-V,150W,SLP251 0406-001271

DIODE-ZENER;BZX84C6V2,5.8-6.6V,350MW,SOT 0403-001180


DIODE-ZENER;VLZ5V6B,5.45/5.73V,500MW,SOD 0403-000002

[tw2005]

Re: samsung smd part number

MMBD2836, A2X common anode?

KDS181 is common anode, DT851,853, DB851, could be an equivalent.

Edit: got a little lost on the board, DB851(KDS181) is the closest to the relays, maybe this it it?

[budm]

Re: samsung smd part number

"location number dm 806 and dm 807" I do not see them in the pictures of POST2. Do they tested bad? If the Diodes are in parallel with the relay coil for spike suppression, then it will read both direction due to DC relay coil resistance.
Photo and P/N of YOUR board?
By the way, the two relays as shown in post 2 are setup as power on/soft-start for inrush current limitter.

[tw2005]

Re: samsung smd part number

Ok, Here's the "B" rev, CCT is a little different, shows those diodes and location idetifiers you mention.

I think this will sort it LMBD2836LT1G , marking A2X which is also the same as MMBD2836 I had mentioned. Different manufacturer.

[budm]

Re: samsung smd part number

That is what I thought, they are just for relay coil back E.M.F. suppression diodes. I bet it shows conduction in both directions, since they are in parallel with the relay coil. I doubt that they are bad.
What is the problem with the TV? Pictures and more details of what it is not doing will help.