Help identifying these diodes

[vinter93]

Hello everyone!
Im trying to fix a device and upon looking into the diodes, I noticed something odd.
Even though they are all marked the same, the flower like symbol and "MG", the values on the multimeter vary quite a bit between the diodes.
Also, even if the symbol and MG are oriented the same way, some of the diodes are measured one way, others the oposite way, and two of them both ways!!
This leads me to believe they are defective and need to be replaced.
Also, for context, this is a cheap chinese clone of an expensive device. It has about 15 of these diodes
Its got some stability issues and also some power issues.

Anyway, TLDR. I need help identifying these diodes, based on the pictures of the diodes and some of the readings. They all measure 4.5mm*3.6mm*2.5mm

Thanks in advance

 

[snowhead]

Are you measuring the values while the components are still mounted on the board or have you removed them?
If still mounted the reading will likely be affected by other components in circuit.

If the components are removed there may be information on the underside, however I think this is unlikely as they will have been supplied on a roll / cartridge for insertion by machine so wouldn't need individual identification, which if was on would add to the cost of production.

You'll need to determine the Surface Mount package code for the size / type, then using a datsheet similar to below, begin a search for your components.

MD Marking, MD Datasheet

Marking: MD. Part #: RP130Q241D. Package: SOT-343R. Datasheet: 510Kb/32P. Manufacturer: RICOH electronics devices division. Description: LOW NOISE 150mA LDO REGULATOR. 1,964 Results.

www.alldatasheet.co.uk

SMD code posssibles

SMD Packages: Sizes Dimensions Details » Electronics Notes

SMT components, SMDs come in a variety of packages - there are several standard packages: 1206, 0805, 0603, 0403, 0201, SOT, SOIC, QFP, BGA, etc. . . details . . . .

www.electronics-notes.com

 

[vinter93]

Are you measuring the values while the components are still mounted on the board or have you removed them?
If still mounted the reading will likely be affected by other components in circuit.

If the components are removed there may be information on the underside, however I think this is unlikely as they will have been supplied on a roll / cartridge for insertion by machine so wouldn't need individual identification, which if was on would add to the cost of production.

You'll need to determine the Surface Mount package code for the size / type, then using a datsheet similar to below, begin a search for your components.

MD Marking, MD Datasheet

Marking: MD. Part #: RP130Q241D. Package: SOT-343R. Datasheet: 510Kb/32P. Manufacturer: RICOH electronics devices division. Description: LOW NOISE 150mA LDO REGULATOR. 1,964 Results.

www.alldatasheet.co.uk

SMD code posssibles

SMD Packages: Sizes Dimensions Details » Electronics Notes

SMT components, SMDs come in a variety of packages - there are several standard packages: 1206, 0805, 0603, 0403, 0201, SOT, SOIC, QFP, BGA, etc. . . details . . . .

www.electronics-notes.com

Thanks for the reply.
Yes, looks like you are right, the other components were affecting the readings.
Also no info on the underside.
Back to investigation I guess or maybe I will just discard the board interelly and buy another one.