CurtPalme.com Home Theater Forum

Jeremy112 · Joined: 28 Sep 2006 Posts: 2649 Location: Fond du Lac, WI

Well it appeares my $30 video processor has an issue, which isn't a surprise for the price, lol. I can turn it on, go through all the functions and so on. The problem is, there is a transistor that has a small heatsink on it (3 legged BCE) the heatsink has 6 little fins, that is hot enough to fry an egg when you plug it in... It has been in standby since I plugged it in on the test bench, and does this as well...

I dont know the location name of it either since it does not say on the PCB... but the numbers on the transistor are: JM37AG, LM1085, IT-ADJ

There is also a similar part next to it, only without a heatsink, it gets warm, but not scorching hot like the part above

I think the (possibly?) bad part is a transistor anyway, could be a regulator but I am not a pro techie and do not know!

Could this part getting so hot be why the processor gives an error and turns itself off randomly? My experience with random power downs usually leads to an over heating issue of some sort... and that part like I said gets so hot it can cook some breakfast!

Any Ideas? I need this fixed so I can get my timings set on my XG, then I am DONE working on it (for a while anway Very Happy

)

**AnalogRocks** · Posted: Wed Jan 11, 2012 5:14 pm Post subject: Re: DVDO iScan HD Error..

**Curt Palme** · Posted: Wed Jan 11, 2012 5:17 pm Post subject:

It's most likely a regulator chip that powers the set. I've seen numerous units that run those close to the kill factor, not sure if that's normal or not in a DVDO, you'd have to measure the current running through it. Regulators either fail or are OK, I don't think you'd get an 'inbetween' function..

Jeremy112 · Joined: 28 Sep 2006 Posts: 2649 Location: Fond du Lac, WI

The error code just came up too, it is:

ERR-FD80-98-011F

if it helps Smile

Jeremy112 · Joined: 28 Sep 2006 Posts: 2649 Location: Fond du Lac, WI

Heres pics of the LEDs inside the unit, the LED/ LCD on the front of the unit, and a pic of the suspected part. (sorry for the blur)

Hope these help

**kal** · Posted: Wed Jan 11, 2012 5:32 pm Post subject:

The LM1085 is a voltage regulator. This one has adjustable output. 3 amps max.

Here's the LM1085 info: http://www.national.com/mpf/LM/LM1085.html

The LM1117 is the same (also adjustable) but limited to 800mA max, hence the smaller heat sink. They're using the copper on the PCB as the heat sink.

You could try swapping one or both out (odd that both would be defective). Could also be that something downstream is not working right and actually drawing a lot of power and the LM1085 and possible LM1117 that are getting hot are just doing their jobs.

Was this $30 VP sold "as is"?

Kal

RayN999 · Posted: Wed Jan 11, 2012 5:34 pm Post subject:

That's a low-dropout adjustable regulator, probably set to a fixed value based on the resistors close by. I'm looking now, but I'm pretty sure you could get a replacement from DigiKey, Jameco, Mouser or such.

Digikey part: http://search.digikey.com/us/en/products/LM1085IT-ADJ%2FNOPB/LM1085IT-ADJ-ND/363565

Jeremy112 · Joined: 28 Sep 2006 Posts: 2649 Location: Fond du Lac, WI

**Curt Palme** · Posted: Wed Jan 11, 2012 5:43 pm Post subject:

My guess is that the power supply is bad. Common failure in older DVDOs. A power supply that sends AC spikes through the DVDO would cause that regulator to overheat. If you dare, crack open the power supply and check for burst caps.

Jeremy112 · Joined: 28 Sep 2006 Posts: 2649 Location: Fond du Lac, WI

**Curt Palme** · Posted: Wed Jan 11, 2012 6:14 pm Post subject:

Ahh, gotcha. It could be some other fault in the unit, causing excessive current to be drawn. You might put your finger on all the chips and transistors other htan that regulator to see if they're running hot. I agree, the seller kinda scammed ya... Still, if you can solder, change that regulator for S&G.

Jeremy112 · Joined: 28 Sep 2006 Posts: 2649 Location: Fond du Lac, WI

Jeremy112 · Joined: 28 Sep 2006 Posts: 2649 Location: Fond du Lac, WI

Also.. Related to functionality, before I skim through the lengthy detailed OM for this baby, does anyone know how I would go about adding my own resolution to the video processor... without the remote?

I want to run my XG at 1680x1050, it seems to like that resolution as far as IQ is concerned, and its a nice compromise between 720p &1080p

Jeremy112 · Joined: 28 Sep 2006 Posts: 2649 Location: Fond du Lac, WI

Ok heres an update.

Since I have tried the bigger heatsink on top of the VR heatsink, the VP has been working just fine for hours, no random power downs, no glitching of any sort, so that leads me to beleive the VR needs to be replaced, or something is causing it to get hot, but I dont know what that would be because nothing else smells fried, or hot, and all the functions of the VP that I've been tinkering with work fine...

Boilermaker · Joined: 21 May 2006 Posts: 527

I have a VP50 and have the same issue. I can't believe they use a chassis with almost no ventilation. They should have a small fan on one side and vent holes on the other.
I have the same complaint about many other new consumer devices made today. How cheap can they make them!

Bob

Jeremy112 · Joined: 28 Sep 2006 Posts: 2649 Location: Fond du Lac, WI

Jeremy112 · Joined: 28 Sep 2006 Posts: 2649 Location: Fond du Lac, WI

Well I just wanted to update everyone, I have traded off the iScan HD (non working) to Ray here on the forum for a HD Fury Gamer, I went ahead and bought myself a DVDO VP30 so I can get HDMI and HDCP.

So hopefully Ray here will be able to get it going! Very Happy