nodols
Junior Member
Posts: 75
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Post by nodols on Apr 28, 2023 15:40:28 GMT -5
I'm trying to identify a component from Anthem MRX500, I can't any service manual or schematic diagram. They are not selling or issuing as far as I've read. Kind of a bummer especially that they sell really pricey receivers. Any help in identify this component would be a great help. It's a 5 pin surface mounted, with the markings at the top 1v51. Tag is IC459.  I'm thinking this might be a regulator but can't confirm. Any help is much appreciated. Thanks |
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nodols
Junior Member
Posts: 75
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Post by nodols on Apr 29, 2023 12:57:05 GMT -5
Will apparently, I am poking around the dark here, and I'm down to these two components, I've remove the 2 regulators and the ADV7511 in trying to bring back the resistance to I believe normal values. Poking around the QFP ADV7511 I get a lot of low resistances. Ranging from 0 to less than 100ohms.
I have the exact known good model which has obviously higher and known good values.
And yup I'm getting the negative vibes on these two caps.
Taking and break ang posting this as an update.
To recap, I'm trying to get HDMI video output out from this MRX 500 which doesn't have it.
I have removed the ADV7511 in hopes that it was the one thats faulty, somehow it wasn't as low resistances around these caps around 100ohms is still there. Known good sample gives about 5k ohms, ground to plus.
Problem with Anthem again is Zero Schematic diagram for I believe all their AV receivers.
Which is huge bummer. Denons, Onkyos, Pioneers have very good documentation. Even Cambridge Audio has given me the Service Manual I needed when I asked for one over email. Kudos by the way to Cambridge Audio. But Anthem.. tsk!
So yeah here we are now. Down to these two.
Planning to remove one of and hopefully the low resistances returns to normal.
I'm fairly new to electronics repairs but not really familiar with the terminologies.
I'm thinking both of these caps are "decoupling" caps? If I have right, correct me if wrong. Both seems to be in parallel connection as one leg is ground and the other leg are connected together.
So I'm thinking one of them is either shorted or just decided to identify itself as a 100 ohm resistor
The question now is what could be the value of the surface mounted capacitor?
The alum electrolytic is obvious as it is marked, but the smd cap is the problem as I don't have the schematics.
As I've read if these were decoupling caps there are typical values. So I might be able to get away with those values, but just wanted to check with the experts here first.
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Post by tibimakai on May 2, 2023 10:02:54 GMT -5
Did you check those two caps for short?
You say that you have another receiver. Take one cap out, and measure it.
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nodols
Junior Member
Posts: 75
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Post by nodols on May 5, 2023 18:23:56 GMT -5
Did you check those two caps for short? You say that you have another receiver. Take one cap out, and measure it. Yup I did, seems like it's not it. Sort of removing larger components now. Still couldn't find it. I'm thinking it's the smaller surface mounted caps, but I'm kind of bummed at hdmi boards. Fix rate is really low. 1 out of 10 I think. Odds are too low. Manufacturers are making them really tiny that it takes thousands of $ worth of tools to fix a 200 receiver. Sadly, it's a rabbit hole in a manufacturer's disposable economy. |
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