LCD monitor VT17W7X not powering on

[Welchs101]

Re: LCD monitor VT17W7X not powering on

See enclosed pic.

Basically when the button is pushed you get a short between 1 and 2. But what i cant figure out is how the LED lights up? I would have thought that by pressing the button this would allow a voltage to go through to the led but i am thinking this is wwrong.

Also, if anyone has a datasheet or ideas when i can get a replacement part (see enclosed pic).

[Welchs101]

Re: LCD monitor VT17W7X not powering on

note: replacement part i am looking for has the marking of "BS17P" on it.

[alexanna]

Re: LCD monitor VT17W7X not powering on

See enclosed pic.

Basically when the button is pushed you get a short between 1 and 2. But what i cant figure out is how the LED lights up? I would have thought that by pressing the button this would allow a voltage to go through to the led but i am thinking this is wwrong.

Also, if anyone has a datasheet or ideas when i can get a replacement part (see enclosed pic).

I hooked up negative lead of voltmeter to a ground screw, The positive lead was used to probe each pin on the front panel switch

[Welchs101]

Re: LCD monitor VT17W7X not powering on

I finally got around to making the measurements.

See enclosed pic for reference.

I may have changed the nomenclature for the pins sorry about that.

Pin5 shorted/connected to "a"
Pin8 shorted/connected to "b"
Pin3 shorted/connected to "c"
Pin8 shorted/connected to "d"
Pin2 shorted/connected to "e"
Pin8 shorted/connected to "f"
Pin1 shorted/connected to "g"
Pin8 shorted/connected to "h"
Pin8 shorted/connected to "j"
Pin6 shorted/connected to "k"


Pin5 measured 5.06V
Pin8 measured 0V

Pin3 measured 5.06V
Pin8 measured 0V

Pin2 measured 5.06V
Pin8 measured 0V

Pin1 measured 5.06V
Pin8 measured 0V

"note how j and k are different than the other push buttons"
Pin6 measured 5.06V
Pin8 measured 0V


Note: Pin 8 is connected to Pin "m" and is connected to the cathode of the LED. Not sure where the annode (pins "p" and "s") is connected.


Not sure what all this means?

[Welchs101]

Re: LCD monitor VT17W7X not powering on

So do you think if i replace the regulator this will correct the problem?

[alexanna]

Re: LCD monitor VT17W7X not powering on

So do you think if i replace the regulator this will correct the problem?

I wish I knew the answer to that question.
All I can tell you is what I measured on my monitor that was working. Sometimes you have to take small steps to repair a problem.
Did you ever find the pin on the front panel switch with 2.1volts that should change from a high voltage to a low voltage as the power button is pushed?

[Welchs101]

Re: LCD monitor VT17W7X not powering on

no i did not find the 2.1V. But in post #44 i did try and make some measurements that i thought you would like to see. If there other measurements you want me to make just let me know.

[alexanna]

Re: LCD monitor VT17W7X not powering on

I don't know of anything else for you to check, If you don't see 2.1v on
pin 11, I think the problem is on the logic board