Need help identifying capacitor value on the Samsung LCD TV inverter.

[newbie1]

I saw on the telly that there are 'deadly storms' in the US. Hope you guys there are fine.

Back to the topic.

Inverter Model : auo 19.26006.108 found in Samsung LCD TV

Fault : Plugged. Pressed the Power switch on the TV. Power LED is red. Blinks 4 times. Goes to STEADY red. Then the TV goes 2-sec to black. Sound can be heard. Backlight is off.

What I did : Measured the output voltage to the inverter. I got 24V. As the power supply board is IDENTICAL with the just repaired & verified working LA32S81B, i swapped them & confirmed that the Power board is not the cause of the TV's 2-sec to black. So now, i am zooming in on either the CCFL or inverter. Unplugged & measure the 5 fuses & found F5 open. I continued further to measure on the surrounding Caps & found C7 having resistance of 118ohms both ways (shorted, rite?).

So now the questions are :
1) How do I identify the value of the SMD capacitor C7? Or does anyone have the same inverter schematic which can identify it for me?
2) IF i could not find an exact SMD capacitor type, can i substitute it with a another capacitor type of the SAME value?
3) Same goes for the fuse. Am I able to replace it with a glass T3.15A 250V fuse?

Please note that I DO NOT have a capacitance meter to measure the IDENTICAL SIZE capacitors on the inverter and my soldering skills are not expertly enough to remove the SMD components WITHOUT damaging them..

Appreciate all your inputs

[Th3_uN1Qu3]

Re: Need help identifying capacitor value on the Samsung LCD TV inverter.

That cap might have a resistor in parallel. 118 ohms is too high to be a short. If the fuse popped then check any transistors after it for shorts before you replace it.

[alexanna]

Re: Need help identifying capacitor value on the Samsung LCD TV inverter.

3) Same goes for the fuse. Am I able to replace it with a glass T3.15A 250V fuse?

From firsthand experience I would not use the glass fuse,If there is a short it may not open up fast enough.
I wonder if the light bulb would be a better substitute for testing?

[jetadm123]

Re: Need help identifying capacitor value on the Samsung LCD TV inverter.

I'm inclined to agree with Th3_uN1Qu3 that it's likely one of the mosfets, Q4 or Q8, has shorted causing F5 to blow. If you don't feel comfortable unsoldering F5, then you can probably solder the new fuse on top of the old one. Or, with a little practice, if you can handle a soldering iron in each hand, then you can heat up both ends of the fuse at the same time in order to remove it.

[newbie1]

Re: Need help identifying capacitor value on the Samsung LCD TV inverter.

That cap might have a resistor in parallel. 118 ohms is too high to be a short. If the fuse popped then check any transistors after it for shorts before you replace it.

I'm inclined to agree with Th3_uN1Qu3 that it's likely one of the mosfets, Q4 or Q8, has shorted causing F5 to blow. If you don't feel comfortable unsoldering F5, then you can probably solder the new fuse on top of the old one. Or, with a little practice, if you can handle a soldering iron in each hand, then you can heat up both ends of the fuse at the same time in order to remove it.

You guys are awesome!!..

I manage to SLOWLY remove the cap without damaging it. Re-measure across the solder pads on the PCB & it still measures 118ohms. So i replaced Q4 (FDD5614P) (took a long while to be delivered, actually), & replaced the fuse with a 3A picofuse. Switch on the TV & its ALIVE!!!.. let's see whether it can withstand my kids 17hours-non-stop-watching-TV routine.. hehe

Big thanks to Th3_uN1Qu3, jetadm123 & Alexanna for your inputs..

[alexanna]

Re: Need help identifying capacitor value on the Samsung LCD TV inverter.

^
Hell my TVs stay on 24/7 my dogs like watching animal planet