Low Voltage Going To Regulator Input Pin

[Grannyrogers]

Good day all,

I have a tv logic board that has 1.69v going to all regulators except one when the correct voltage should be 5v. The board is receiving the correct voltages from the power supply, which are 5v and 15v respectively, so my question is: what would cause several regulators to receive low voltages? Could it be bad caps?

[Grannyrogers]

Re: Low Voltage Going To Regulator Input Pin

Does anyone have any idea?

[eccerr0r]

Re: Low Voltage Going To Regulator Input Pin

without the device itself in hand, a schematic or even a picture of the device it's hard to tell...of course it's possible, or it could be multiple failure caused by bad caps...

[Longbow]

Re: Low Voltage Going To Regulator Input Pin

I have a tv logic board that has 1.69v going to all regulators except one when the correct voltage should be 5v. The board is receiving the correct voltages from the power supply, which are 5v and 15v respectively

If the logic board itself has +5v, and the input to all regulators is +1.7v....then obviously you have a high resistance somewhere between the input plug and the regulators. Turn the power off, pull the power connector to the logic board. Measure the resistance from the +5 terminal to the input of your regulators. Then follow the power traces back to the power connector.