Can anyone identify these two smd diode?

 

Top one is likely a Zener diode. Many "WN" devices are, and the Z81 on the board solkscreen indicates Zener diode as well. However, cannot find any reference to Zener voltage.
Bottom is also labelled Z82, likely a zener as well, and likely a different voltage (a guess)

EDIT: found one reference that says WN is a 22V Zener, WY is a 2.0V zener. Strange values...
http://www.s-manuals.com/pdf/datasheet/b/z/bzt52c2v0-bzt52c51_r37-2_diodes.pdf
D5 and EN may be the date codes

 

Perhaps this zener diode is BZX84C18.
http://www.s-manuals.com/pdf/datash...51cw,_bzx84c2c4-bzx84c75_20130830_taitron.pdf

 

Perhaps this zener diode is BZX84C18.
http://www.s-manuals.com/pdf/datasheet/t/z/tzt2v4aw-tzt51aw,_tzt2v4cw-tzt51cw,_bzx84c2c4-bzx84c75_20130830_taitron.pdf

Wrong form factor. His diodes are 2 terminal devices, not SOT-23

 

I didn't see well. Then maybe yours, or this one.
http://www.s-manuals.com/pdf/datasheet/b/z/bzt52-c2v4_series_r03_panjit.pdf

 

I didn't see well. Then maybe yours, or this one.
http://www.s-manuals.com/pdf/datasheet/b/z/bzt52-c2v4_series_r03_panjit.pdf

Yes, that is another viable one. In fact, the voltages on that chart seem more realistic than the one I linked to before. Too bad different vendors use the same codes for different zener voltages. Too bad this sheet does not explain the date codes.

 

@neet, Lets get back to basic questions. Why are you looking at these diodes in the first place? They do not look blown. While they are in circuit, no multi-meter reading will be significant, you can't tell if they are good or not with a simple meter diode test. With power on, you can measure the voltage across the Zener, see what the voltages are. They should be fairly constant. Then, what are the rest of the reasons why you are looking at this section of the board, what is not working?

 

While they are in circuit, no multi-meter reading will be significant, you can't tell if they are good or not with a simple meter diode test.

A digital multimeter in diode test mode should be able to check them in-circuit normally. I even did comparison tests with the LCR Pro1 Plus tweezers, no difference.

 

This reference points to BZT52C22 (Z81) and BZT52B43S (Z82)