Onkyo HDMI board cooling

[lmm...@gmail.com]

Hi, may I ask for some advice? I have an Onkyo 5009 AV Reciever with the very common problem of overheating HDMI board. You can see it just under the grill for cooling in the case. I have an infrared heat sensitive camera and discovered there are several small ic's that get very hot very quickly- i.e. 70-80c. The ICs are very small, 10mmx10mm up to 10mmx16mm and thereabouts but there is space of about an inch above so room for a heat sink maybe? What would you chose to do? Fit heat sinks to those chips(if there are any small enough) or fit fans directly above the board? I'd really welcome your advice.

Steve

[John-Del]

On Wednesday, July 26, 2017 at 2:47:33 AM UTC-4, lmm...@gmail.com wrote:
> Hi, may I ask for some advice? I have an Onkyo 5009 AV Reciever with the very common problem of overheating HDMI board. You can see it just under the grill for cooling in the case. I have an infrared heat sensitive camera and discovered there are several small ic's that get very hot very quickly- i.e. 70-80c. The ICs are very small, 10mmx10mm up to 10mmx16mm and thereabouts but there is space of about an inch above so room for a heat sink maybe? What would you chose to do? Fit heat sinks to those chips(if there are any small enough) or fit fans directly above the board? I'd really welcome your advice.
>
> Steve

The ICs can safely run at those temps, but the cooler they run, the longer they should last theoretically. I wouldn't worry about it unless that receiver is known to have failures on that board.

A surprisingly small amount of airflow will reduce the temps more than you might expect. A small fan could cool the whole board at once. I have a collection of small stick-on heatsinks that were used on plasma scan ICs that I keep for projects. A tiny drop of heat sink compound and a bit of clear RTV on the corners will locate the heat sinks down.

[pf...@aol.com]

>> A tiny drop of heat sink compound and a bit of clear RTV on the corners will locate the heat sinks down. <<

WARNING: Be exceedingly cautious with RTV silicon in any electronic application! Conventional materials use Acetic Acid as the catalyst/curing agent, and releases a good deal of it during the process. Acetic Acid attacks copper and many other metals.

Use an ELECTRONIC (Neutral Cure) RTV.

https://www.alliedelec.com/gc-electronics-19-155/70159837/?mkwid=srzNgXKQF&pcrid=30980760979&gclid=Cj0KCQjw--DLBRCNARIsAFIwR25fLPHRGK1Ekfxi-TwPx_i68BY5GgpTF--jqXtQxu32NH3k6vQjp3EaAicDEALw_wcB


Peter Wieck
Melrose Park, PA

[Mark Zacharias]

On Wednesday, July 26, 2017 at 1:47:33 AM UTC-5, lmm...@gmail.com wrote:
> Hi, may I ask for some advice? I have an Onkyo 5009 AV Reciever with the very common problem of overheating HDMI board. You can see it just under the grill for cooling in the case. I have an infrared heat sensitive camera and discovered there are several small ic's that get very hot very quickly- i.e. 70-80c. The ICs are very small, 10mmx10mm up to 10mmx16mm and thereabouts but there is space of about an inch above so room for a heat sink maybe? What would you chose to do? Fit heat sinks to those chips(if there are any small enough) or fit fans directly above the board? I'd really welcome your advice.
>
> Steve

It's the larger BGA chips that suffer from the heat. Recent vintage Onkyo's are notorious for this.

[Arfa Daily]

As Mark says ...

Over here in the UK, Onkyo have a free repair service when this board
fails due to chips unsoldering themselves. You enter the unit's serial
number into a website, and it immediately tells you if it qualifies for
free repair. If it does, you fill in address details, and they arrange
to collect it and return it fixed, usually within a week.


Arfa

[lmm...@gmail.com]

I have sent it for repair once free of charge, but don't want to have to do it again, and if by keeping it cooler I can prevent it, I'd like to go that route. The dts chips that causes the no sound fault in these machines gets Nearly 80c but not as hot as the big chip to its left, I think this is referred to as the Bits Chip.
I have plotted all the hot chips sizes and ordered a pile of small heat sinks and a couple of 6" PC fans to fit on the top case to blow air over the board silently. Hopefully, I won't have to get it fixed another time with these mods. I will post a you tube video shortly of the thermal imaging of this board.

Steve

[lmm...@gmail.com]

Here's a video of before any mods and after only being on for five mins with no the receiver not doing anything other than being on- https://youtu.be/C6QfmmJzWks