How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Louie Your Own Question
Louie, Technician
Category: Home Theater-Stereo
Satisfied Customers: 11753
Experience:  Have been in the business 25+ yrs., down to component level.
Type Your Home Theater-Stereo Question Here...
Louie is online now
A new question is answered every 9 seconds

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: 1 year ago.
Category: Home Theater-Stereo
Expert:  Louie replied 1 year 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 1 year ago.

2 resistors

Expert:  Louie replied 1 year 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 1 year ago.

Louie did you get a look at q1?

Expert:  Louie replied 1 year ago.

Unfortunately, could not make out the numbers.

Customer: replied 1 year ago.

How about now?

Expert:  Louie replied 1 year 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.

Related Home Theater-Stereo Questions