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Class D Switching Power Amplifiers and Power D/A conversion

Please help to identify that resistor
Please help to identify that resistor
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Old 11th May 2020, 05:37 PM   #11
Mooly is offline Mooly  United Kingdom
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Please help to identify that resistor
You are measuring them with one end lifted to isolate it?
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Old 11th May 2020, 05:47 PM   #12
Pass lover is offline Pass lover  United Kingdom
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Visionally check all the capacitors, they are all fine. ( I may be wrong)
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Old 11th May 2020, 06:44 PM   #13
Mooly is offline Mooly  United Kingdom
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Please help to identify that resistor
I'm going to muddy the waters again...

Is the one that measures 16k the one at the left in that last image?

The colour code on that one looks very different to the other... could that second band be blue?
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Old 11th May 2020, 08:01 PM   #14
Pass lover is offline Pass lover  United Kingdom
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Visionally check all the capacitors, they are all fine. ( I may be wrong)
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Old 11th May 2020, 08:14 PM   #15
Pass lover is offline Pass lover  United Kingdom
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Hi Mooly
Thanks for your questions
As you see in the photos, all Resistors were disconnected from the board before testing.
The left one :18,2 K ( it looks older than the right )
The right : 16,3k ( the one near the transformer)
Please look at the photo below . The photo was taken BEFORE I clean them by alcohol. The right resistor looks cleaner. My mistake. It made the colour code fader than it is.
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File Type: jpg 30EA558F-CCBF-4BE1-A299-4C7B2E0133BD.jpg (613.0 KB, 29 views)
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Old 12th May 2020, 07:08 AM   #16
Mooly is offline Mooly  United Kingdom
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Please help to identify that resistor
OK So doubt and confusion reign over what they might be.

Khron mentioned the diodes next to these resistors look like they might be Zeners. I agree, its a classic configuration. If so then you probably have a lot of leeway on what would actually work.

If it really did originally look like the other resistor then is it an 18k that has gone low?

As there is doubt I think all you can do is go off what you believe to be correct, that both were the same visually and assume it has gone low in value (rare situation but not unknown) and replace both with new 18k metal oxides.
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Old 16th May 2020, 01:45 PM   #17
haiqu is offline haiqu  Australia
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Looks to be 18k 1% 2W to me.
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