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Author Topic: Yamaha HTR-5990 Screen/Diag Mode issue  (Read 788 times)

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Offline ALearningLadTopic starter

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Yamaha HTR-5990 Screen/Diag Mode issue
« on: January 30, 2022, 03:12:53 am »
All segments of the display come on and stay on, nothing on the HDMI output. This is in Diag Mode, fixed all issues I can humanely find. Any thoughts?
Name a few test points if you want me to probe them, I'm just lost at this point. https://manualzz.com/doc/22983407/yamaha-htr-5990-service-manual < Service Manual
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Offline ALearningLadTopic starter

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Re: Yamaha HTR-5990 Screen/Diag Mode issue
« Reply #1 on: January 30, 2022, 03:32:42 am »
Also some segments are brighter then others. I'm assuming the displays attempting to boot but stopping. Also it gets darker over time.
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Offline ALearningLadTopic starter

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Re: Yamaha HTR-5990 Screen/Diag Mode issue
« Reply #2 on: January 31, 2022, 04:48:17 am »
What i would really appreciate it a test point/data line/whatever the hell you want to call it to the display. Hook my scope up and see if it's working. Any ideas on where that test point would be?
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Offline mzacharias

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Re: Yamaha HTR-5990 Screen/Diag Mode issue
« Reply #3 on: February 01, 2022, 11:19:22 am »
If it does this whenever power is applied, and not just in Diag mode, I'd be suspecting the display driver IC itself.

You obviously have the -30V and +5V supplies.
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