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Louie, Technician
Category: Home Theater-Stereo
Satisfied Customers: 11442
Experience:  Have been in the business 25+ yrs., down to component level.
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Louie I have a power switch which doesn't turn on. Please

Customer Question

Louie I have a power switch which doesn't turn on. Please advise.
Submitted: 11 months ago.
Category: Home Theater-Stereo
Expert:  Louie replied 11 months ago.

Hi and welcome to JustAnswer,

Thank you for the question and your patience. Should you still need assistance for information purposes only...

Initially, there would be both +5V and -5V. What part(s) are inside the heat shrink tubes near the big capacitors please?

Customer: replied 11 months ago.

2 resistors

Expert:  Louie replied 11 months ago.

That these resistors are encapsulated would point to a possibility of potential heat issues. Please check resistances of these resistors and compare to marks/color codes.

Customer: replied 11 months ago.

Louie did you get a look at q1?

Expert:  Louie replied 11 months ago.

Unfortunately, could not make out the numbers.

Customer: replied 11 months ago.

How about now?

Expert:  Louie replied 11 months ago.

Appreciate the clear picture Johnny and it is an N-Channel MOSFET switching regulator.

Proposed preliminary tries (if have not been done):

  • • check the DCV between the 2 legs of the biggest capacitor;
  • • using the negative leg of the biggest capacitor as reference ground, what are the voltages of the 3 legs of the MOSFET.

A friendly reminder: voltage measurements by its very nature requires that the unit/circuit be plugged in and therefore LIVE! Please exercise due care and caution.