Need help with identifying those parts

[LearningToRepair]

Hi!


Can anyone help me to tell what these parts 1, 2 and 3 are on image?


1 and 2 both have Y2 written on them. Would also like to know how to tell if they are healthy or need replacement and what to keep in mind when buying replacements?

Part nr 3 seems to be resistor but I am confused because it has 100 written on it but it's value seems to be 10 ohm not 100 so just asking for confirmation. This resistor has now melted hole in it and smells after plastic/pcb when I power it on.

[petehall347]

Re: Need help with identifying those parts

10 ohm resistor ... 10 then 0 . last zero is how many zeros follow 10 . example 102 1k 1000 ohms .
y2 top of my head might be pnp transistor . might not as well .best wait for the experts .

[LearningToRepair]

Re: Need help with identifying those parts

Thanks, looks like that yes.
http://www.s-manuals.com/smd/y2

At the top this site also lists Zener diodes with code y2. Does anyone know what these pins 1,2 and 3 are for? For example, for PNP transistor it gives names for pins such as base, collector and emitter but for zener diode it doesnt give any names. For exaample in this PDF: https://cdn.badcaps-static.com/pdfs/...6aeaf9bc32.pdf

How do I know in that case what pins 1, 2 and 3 are for? And how do I test these? I mean so far I only know zener diodes with 2 pins. But I dont know what to do with 3 pin version.

Asking it because I seem to have these also and I want to test if they are good.

Update: I would also like to know what does R mean in resistor number?


If I need 10 ohm, do I need to by 10R? And also how do I know if it is right size?

[stj]

Re: Need help with identifying those parts

pin3 is the zener cathodes - the pdf shows the internal diagram

resistors - R is short for ohms

[R_J]

Re: Need help with identifying those parts

Sometimes the `R` marked on a smd resistor is in place of the decimal as in 1R5 which is a 1.5Ω
The Y2 are likely PXT8550 PNP transistor, SOT89 case