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Duet GWH9100LW0 CCU squeeling noise  Rate Topic 
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 Posted: Sun Jan 22nd, 2006 09:21 am
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markcm
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First of all, this forum is great and has been very helpful. Thank you to everyone here!

Here's a breif intro to my project: I just got a very lightly used but abused Whirlpool Duet GHW9100 LW0 front loading washer with broken door latch, cracked plastic door cover, and missing knob; the unit was a store return (someone had pulled the door open while it was locked) and I got it dirt cheap from a liquidator. I quickly located the latch and knob with help from you folks and replaced them.

The washer fired right up and runs through the diagnostics with no issues, this is a good start :)

The issue remaining is a high pitched noise from the CCU, when the unit is in standby the CCU emits an electronic high frequency noise- once I push the ON button the high pitch component goes away although there is still a noise emitted. This noise is observed with the metal top off the machine although I don't suspect putting the top back on will hide the noise or fix the issue.

I popped the top off the CCU and the noise seems to be coming either from the small yellow transformer in the rear just near the center or one of the 2 capacitors next to it- see the picture I attached.

Before I dive in with my solder iron and start changing capacitors, do any of you warriors have some input? I can provide additional details or pictures if needed.

Thank you in advance, your help has already been invaluable.

-Mark

Attachment: GHW9100ccu.jpg (Downloaded 12 times)

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 Posted: Sun Jan 22nd, 2006 09:44 am
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markcm
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Dammit!

I read the 10 commandments and still botched it, isn't there a clause for working on your washer at midnight and pressure from your wife to get her washer fixed? Okay, enough with the excuses.

Any ways, my washer model from the post above (for some reason the edit feature is not working) is a GHW9150PWO

That is:
    GHW9150PWO

    GHW9150PWO

    GHW9150PWO

Another note: the frequency of this noise changes a bit when the door is opened or closed, so I am assuming when the original owner ripped the door open while it was locked it put some electrical strains on one of the componantes which I circled in the picture attached to my first post.

Please let me know if these symptoms are familiar to you or you have ideas on testing/ repairing it.

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 Posted: Sun Jan 22nd, 2006 08:13 pm
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markcm
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I changed the capacitors adjacent to the transformer this morning and now change. I am now checking into what the two IC's next to the transformer are TNY255P and 817B.

Any advise is appreciated.

If I don't find the source of this sqeal, is there anywhere to get used CCU's so I don't have to drop $250 on a new one?

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 Posted: Sun Jan 22nd, 2006 08:50 pm
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markcm
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I have just researched the TNY255P 8pin IC located at the source of my mystery noise and it is a switching device commonly used for stand by modes in electronics. As my noise changes from Standby to ON, this may be narrowing in on the cause of my audible noise. I have attached a diagram equivalent to the circled area of the picture I posted in my first post.

The 817b looks to be an optical isolator used in conjunction with the switching tny255p, I don't suspect it is the cause.

Here is the .PDF to the TNY255P IC

http://www.powerint.com/PDFFiles/tny253-255.pdf

This .PDF clearly describes the operation of this chip with the capacitors and the transformer also discussing audible noise if the circuit is not tuned properly with the transformer or capacitors. I a reading more now, if you have ideas this document seems like a very likely source for resolution to my issue.

My next plan is to test/ replace the components associated with this TNY255p switch circuit.

Attachment: (Downloaded times)

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 Posted: Wed Jan 25th, 2006 05:16 am
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markcm
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Yikes,

I can't find a distributor to sell me just one TNY255P chip.

I did find a very friendly fellow ebay store ApplianceJunk http://stores.ebay.com/ApplianceJunk who had the whole control unit at a very good price and have purchased it. Very friendly and he has other used appliance parts.

I will continue the hunt for the TNY255P anyways, just not as urgent.

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 Posted: Mon Mar 31st, 2008 01:15 am
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volleyball
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Did you ever fix this? I am also trying to repair my ccu on my sears

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 Posted: Mon Mar 31st, 2008 01:23 am
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volleyball
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How did you make out with this?

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 Posted: Mon Mar 31st, 2008 01:47 am
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markcm
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Hi,

I put the complete replacement "used" controller in that I got off the ebay store mentioned above and it hasn't missed  a beat. It's been a great washer for the past 2 years.

The replacement actually made a bit of a squeal too, i'm not so sure there was anything wrong with the first one other than the noise which may have seemed worse that it was at the time due to the fact that I had the top off the washer and the ecu open. Once the cover is on the washer I don't really hear the replacement unit I put in there unless I listen real closely.

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