Electronics > Repair

Hantek DSO5102P oscilloscope PSU repair

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punkieys17:

The psu has a problem with all the power rails fluctuating, when disconnected from rest of machine. The oscilloscope obviously  didn't like the fluctuations so various buttons etc were flashing.  A few questions to help me get started please as I am not confident in pwm power supplies. Firstly one of the 3 pin large semis with heat sink is marked NSD618 B2045G - can't find it anywhere. It sits directly after the bridge rectifier and smoothing cap. Thinks it's a high power transistor but can anyone help. As all the power rails were fluctuating I am suspecting that chip. Unfortunately I then managed to incinerate components when my hand slipped. As a result the 3 resistors on the back of the board mounted in parralel are toast. They are marker R2x x3 ( can't read the second digit) and from memory were 1.8 ohms...if anyone can tell me would be grateful. The PSU board is marked for the DSO5000 series. Don't suppose anyone has a schematic....

mushroom:
Google, first answer for hantek dso5000p schematics :

https://www.mikrocontroller.net/attachment/175587/Hantek_Tekway_Voltcraft_DSO_hw1007.pdf

Could the 5000P share the same PSU ?

[EDIT] my 5102P has a different PSU. Yours is v1.1, Mine has no version # ; could be 1.0 ...

tunk:

--- Quote from: mushroom on September 15, 2022, 01:27:59 pm ---Could the 5000P share the same PSU ?

--- End quote ---
Probably not, the components and their numbering are different.
Could you post a photo of the back, showing the burned resistors?
If it's a marking on an SMD resistor, then R2x could mean that it is
a 0.2x ohm resistor.

mushroom:
Found this thread, could help a bit (just a bit !) : https://www.eevblog.com/forum/repair/hantek-dso5072p-power-issue/msg3080305/#msg3080305

definitely not my PSU (all THT components), nor the OP's PSU : PCB is labeled 1.0, but there's a high res picture of the copper side : Rnxm means Rn is made of m resistors in series or parallel.

snoop33:
They are 153 (15k).

Mine is also a "1.0" board, but it has a different bridge diode and I spot an additional transistor N4.

I guess a low level PWM is provided to the big transformer by N2 then isolated feedback by N3 and N1 adjusts it.

N5 on the rear is a 5V buck.

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