Samsung LN52A750R1FXZA Turning on and off

[powerblackout]

Re: Samsung LN52A750R1FXZA Turning on and off

There's one that says it should be 13V but it's only 11.91, is that an issue?

[nomoresonys]

Re: Samsung LN52A750R1FXZA Turning on and off

If thats your only off reading, not positive but I dont think it should be too big a deal its pretty close.

[nomoresonys]

Re: Samsung LN52A750R1FXZA Turning on and off

There's one that says it should be 13V but it's only 11.91, is that an issue?

Ok, so all voltages are there right?

[powerblackout]

Re: Samsung LN52A750R1FXZA Turning on and off

Yes the rails look like they are supplying the correct power. What's likely next, TCON or the main board maybe?

[nomoresonys]

Re: Samsung LN52A750R1FXZA Turning on and off

You also checked the voltage on powersupply goiong to inverter too and was correct?

[nomoresonys]

Re: Samsung LN52A750R1FXZA Turning on and off

Yes the rails look like they are supplying the correct power. What's likely next, TCON or the main board maybe?

Well your getting the blu on from the mainboard, test the voltage on the filter capacitor/s again looking for about 160 standby and 380 with tv on, use caution. Tho I guess its there or maybe you wouldnt have the proper voltage on the inverter side.

[nomoresonys]

Re: Samsung LN52A750R1FXZA Turning on and off

Meter on vdc 200 range.

[freakaftr8]

Re: Samsung LN52A750R1FXZA Turning on and off

I don't know this was alredy asked but do you get a picture during the moments after the back light comes on after the Samsung chime before the TV resets?

[powerblackout]

Re: Samsung LN52A750R1FXZA Turning on and off

Could it be the caps I transferred over from the old power supply?

[powerblackout]

Re: Samsung LN52A750R1FXZA Turning on and off

There is no picture, only the backlight comes on.

[nomoresonys]

Re: Samsung LN52A750R1FXZA Turning on and off

So was there a picture or menu with the flashlight test?

[powerblackout]

Re: Samsung LN52A750R1FXZA Turning on and off

Sorry what should I be measuring for the 160 and 380?

[powerblackout]

Re: Samsung LN52A750R1FXZA Turning on and off

I'm not sure what the flashlight test is. If the backlight is coming on I should be able to see the picture shouldn't I?

[powerblackout]

Re: Samsung LN52A750R1FXZA Turning on and off

I measured one of the large capacitors on the power supply, I get 385 volts when the TV is on. The value starts to drop when the tv shuts off but it doesn't stay off long enough for it to drop to 160.

[nomoresonys]

Re: Samsung LN52A750R1FXZA Turning on and off

Could it be the caps I transferred over from the old power supply?

Uh o, you should have used new caps, unless you have a way of checking capacitance.

[nomoresonys]

Re: Samsung LN52A750R1FXZA Turning on and off

But the boards checking pretty good, where are we on testing that inverter board?

[nomoresonys]

Re: Samsung LN52A750R1FXZA Turning on and off

I measured one of the large capacitors on the power supply, I get 385 volts when the TV is on. The value starts to drop when the tv shuts off but it doesn't stay off long enough for it to drop to 160.

Nice, well you can test it in standby without turning it on, for the 160.

[nomoresonys]

Re: Samsung LN52A750R1FXZA Turning on and off

To me this is pointing to inverter or bad lamp.

[nomoresonys]

Re: Samsung LN52A750R1FXZA Turning on and off

I'm not sure what the flashlight test is. If the backlight is coming on I should be able to see the picture shouldn't I?

You have the backlight on? I thought you had the same condition as before.

[nomoresonys]

Re: Samsung LN52A750R1FXZA Turning on and off

There use to be a rock the connector on the tcon board trick to see if theres any activity, not sure if it still applies.