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Louie I have a power switch which doesn't turn on. Please

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Louie I have a power...
Louie I have a power switch which doesn't turn on. Please advise.
Submitted: 1 year ago.Category: Home Theater-Stereo
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Answered in 2 minutes by:
1/5/2016
Technician: Louie, Technician replied 1 year ago
Louie
Louie, Technician
Category: Home Theater-Stereo
Satisfied Customers: 12,874
Experience: Have been in the business 25+ yrs., down to component level.
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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?

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Customer reply replied 1 year ago

2 resistors

Technician: Louie, Technician 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.

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Customer reply replied 1 year ago

Louie did you get a look at q1?

Technician: Louie, Technician replied 1 year ago

Unfortunately, could not make out the numbers.

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Customer reply replied 1 year ago

How about now?

Technician: Louie, Technician 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.

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