Sharp 4P-B43EJ2U wont turn on

[thetonywarren]

Sharp TV/Display, wont turn on. Brand new, used for maybe 30 minutes. Possibly heard pop then set went dead. I took a look at the boards, no visual damage to boards. The led power indicator is ON, remote will not turn on. I verified that backlights do come on when powered with separate power supply/LED tester. I also

[thetonywarren]

[R_J]

If it is Brand New, just return it under warranty

[thetonywarren]

Did that already. Got replacement. Trying to repair this one, since supplier told us we could keep it or dispose. Would be nice to have an extra display on hand.

[nomoresonys]

Try this test, meter in vdc mode, neg. probe on chassis ground pos. on ps-on>check voltage in standby, now leaving probes where they are try powering on tv with power button on tv while keeping an eye on the meter, does voltage change at all even momentarily? Next do the same for the bl-on, then pwm.

[thetonywarren]

Ok, thanks for helping out.

Running your test as described. I have 2.22vdc on ps-on, when in standby. when I try to power on the set, meter does not move at all, not even momentarily.

AS far as bl-on, there is 0.07vdc at standby, also doesnt move when trying to power on.

pwm, 0.00vdc at standby, doesnt move at all when trying to power on.

Appreciate the guidance......

[nomoresonys]

Try unhooking cable from powerboard to mainboard and check all the pins on there standby, ps-on, 12 v etc. For tv safety do all connect and disconnect of cable with tv unplugged from power.

[thetonywarren]

ok, so are you saying to remove power, disconnect cable from powerboard to mainboard and then reapply power and check the pins on the powerboard? Sorry if that's a dumb question. Thanks!