Makita DC10WA charger - R2 and R3 resistors, replacement for MIP3E5MY transistor

Question

Hello
Makita DC10WA charger (7.2V - 10.8V Li-Ion) designed to charge Makita screwdriver batteries. Mosfet - MIP3E5MY was damaged. Please help me choose a replacement for the above. transistor. I guess you can only buy the original directly from China? Moreover, the SMD resistors R2 and R3 on the high voltage side are illegible and therefore I am asking you to provide their values.

Anonymous · Accepted Answer

This is not a MOSFET but a converter (a series of converters of different power in different housings): MIP3E4 is weaker - less powerful than MIP3E5.

pawlik118 · Accepted Answer

You probably need to draw a part of the diagram of this converter with these illegible resistors and select them based on the documentation of the converter controller.

pawlik118 · Answer

Show me a photo of the entire board, maybe I have one that works.

linek27 · Answer

Here you are.

Anonymous · Answer

MIP3E5MY - surely such a marking? What housing?

linek27 · Answer

T-220 housing. Marking according to photos. I found MIP3E4MY for purchase, but it has slightly different parameters. Would work?

linek27 · Answer

Thank you for your help. Unfortunately, the original can't be obtained. I will try MIP3E4MY and possibly MIP2E5DMY. Only those illegible resistors. Maybe some hints?

linek27 · Answer

I`ve already done that. The only problem is that the MIP3E5MY element in the executive diagram does not include these resistors. This means there is a direct connection to ground without any resistance. And be smart here.

pawlik118 · Answer

As for the repair - it is difficult to help without a piece of the diagram with the circuit with these resistors.
As for your last entry, having basic knowledge about the operation of FLYBACK power supplies, you can more or less determine what resistors are supposed to be there. Without a diagram drawn from the board, it is difficult to guess the values. Show the diagram you drew.

linek27 · Answer

Schematic please. Sometimes it`s nice to fix something yourself and learn something else. What about these resistors?

pawlik118 · Answer

Also send a view of the board from the elements side. The diagram shows that the resistors are mounted differently than usual.

linek27 · Answer

Exactly different. Picture please. 20170227_2..625.jpg Download (1.23 MB) 20170227_2..639.jpg Download (4.18 MB)

linek27 · Answer

Hello
Charger repaired. For posterity, the MIP3E5MY converter chip was replaced with MIP3E7MY. It is available in good electronics stores. Resistors R2 and R3 have values of 1 ohm and are connected in parallel. I guess that`s it. Topic to be closed.

Makita DC10WA charger - R2 and R3 resistors, replacement for MIP3E5MY transistor

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