Need help finding IC PLEASE!!

[rmoody]

Hey guys, been a while since I've been here but I have a Hitachi 42" tv here that I'm not getting standby voltage on. I found a chip on the board that that was cracked and I believe this may be my issue. From what I found on another post on here, this chip controls the standby voltage and PS_On voltage. The numbers on the chip are ICE380565

TV Model: Hitachi L42N03A
PS board : JSK4267-022C

[budm]

Re: Need help finding IC PLEASE!!

That IC is commonly used in standby power supply section, you should be able to buy that IC on Digikey, Mouser, or EBAY.
ICE3B0565
PS-ON is generated by the MAIN board.
You should upload good clear pictures of the board so we can see what we are dealing with.

[rmoody]

Re: Need help finding IC PLEASE!!

Thanks, Bud. The chip was cracked across the top of the "B" and I thought it was an 8. Hard to see this shit without a magnifying glass! I believe you were the one who mentioned this chip was the 5v supply on the other post I found. I'll look for a replacement chip.
Oh and i'll get pics when I go outside and get my camera.

[rmoody]

Re: Need help finding IC PLEASE!!

Bud, is there a way to test the IC with a DMM?

[budm]

Re: Need help finding IC PLEASE!!

If the top is crack then there is no need to try to test it, what you need to find out if there is any fusible resistor used for feeding the B+ to run that IC or not.
Right now we need good clear straight shot pictures of the TOP and BOTTOM side of that power supply board.

[rmoody]

Re: Need help finding IC PLEASE!!

I have uploaded pics of the board and the Infineon datasheet as well.

[rmoody]

Re: Need help finding IC PLEASE!!

Are there any consumer stores left in the U.S. that sells components or is everything basically order online? I have a Fry's a couple hours away but I don't want to drive there unless I know they have it.

[rmoody]

Re: Need help finding IC PLEASE!!

So, You got me thinking about the resistor now. I checked the resistor in the attachment below and found it open. According to digi-key resistor calculator, it should have 1.2 Ohms. The resistor seems to have been very hot and some of the ceramic has fallen off. Is it possible this is the root cause or am I chasing my tail here?

[rmoody]

Re: Need help finding IC PLEASE!!

This resistor traces to pin 3 (Current Sense Pin) on the SMPS. This pin on the SMPS appears to have suffered the most heat damage.

[budm]

Re: Need help finding IC PLEASE!!

This resistor traces to pin 3 (Current Sense Pin) on the SMPS. This pin on the SMPS appears to have suffered the most heat damage.

When the MOSFET inside that IC shorted out, it will take out that current sensing resistor with it too.
That resistor is 1.2 Ohm 5% flame proof resistor.

[rmoody]

Re: Need help finding IC PLEASE!!

When the MOSFET inside that IC shorted out, it will take out that current sensing resistor with it too.
That resistor is 1.2 Ohm 5% flame proof resistor.

Okay, I'll search for a resistor as well. Any clue on wattage? I looked earlier and was seeing 1w,2w, and 3w.

[budm]

Re: Need help finding IC PLEASE!!

Okay, I'll search for a resistor as well. Any clue on wattage? I looked earlier and was seeing 1w,2w, and 3w.

You have to check the dimensions and compare it to the spec of the resistor you found on the web, it looks like 1W.

[rmoody]

Re: Need help finding IC PLEASE!!

Thanks. I actually filtered it down earlier on mouser.com to a 2 watt. Got my order in, hopefully they will ship fairly quick. I'm only 160 miles from the factory right now.

[rmoody]

Re: Need help finding IC PLEASE!!

Bud, Parts arrived and installed. My only question is, is it necessary to replace the rubbery silicone material over the leads? Will it arc if I don't? If necessary, what is this material?

[budm]

Re: Need help finding IC PLEASE!!

Electronics grade RTV Silicone. You can run the test just to see if the problem is fixed first.

[rmoody]

Re: Need help finding IC PLEASE!!

Electronics grade RTV Silicone. You can run the test just to see if the problem is fixed first.

You the MAN, Bud! Thanks so much for sharing your knowledge.