The diode is protecting the IC from overvoltage.
Here is the datasheet for the IC:
[url]https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MPQ2315/[/url]https://The diode is protecting the ...MPQ2315/[/url]
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https://[URL]https://www.vlab.%73u/v...atasheet[/URL][URL]https://www.vlab.%73u/viewtopic.php?f=178&t=32576&p=1044796[/URL]
[B]AWVxyz = SY8286BRAC[/B]Last edited by truclacicr; Today, 10:24 AM.
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I haven't been able to find a datasheet. I just know from experience that HDDs have two TVS diodes (5V and 12V) at the power inputs.These can usually be replaced with SMAJ12A/SMAJ5A, SMBJ12A/SMBJ5A or SMCJ12A/SMCJ5A, depending on dimensions.Also be aware that there is often a 4A smt fuse (marked "S") in series with each diode.
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BBM = SMBJ30CA, 30V 600W bidirectional TVS diode
[url]https://www.st.com/resource/en/datasheet/smbj58ca.pdf[/url]https://BBM = SMBJ30CA, 30V 600W bid...58ca.pdf[/url]
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"5Y=" is RT6575CGQW
[URL]https://www.richtek.com/assets/product_file/RT6575C=RT6575D/DS6575CD-04.pdf[/URL]
[url]http://markingcodes.com/search/c/5y%3D[/url]https://"5Y=" is RT6575CGQW<br /> <b.../c/5y%3D[/url]"5Y=" is RT6575CGQW
[URL]https://www.richtek.com/assets/product_file/RT6575C=RT6575D/DS6575CD-04.pdf[/URL]
[url]http://markingcodes.com/search/c/5y%3D[/url]"5Y=" is RT6575CGQW
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https://[url]https://static.chipdip....ergy SM80593L)[url]https://static.chipdip.ru/lib/430/DOC043430777.pdf[/url] (Silergy SM80593L)...
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Too many candidates:
[URL]http://markingcodes.com/search/c/ts[/URL]
[URL]http://markingcodes.com/search/c/fs[/URL]
[url]https://pl.aliexpress.com/item/1005004756587472.html[/url] (photo of 2SA1037[B])[/B]https://Too many candidates:<br /> <...SA1037[B])[/B]Too many candidates:
[URL]http://markingcodes.com/search/c/ts[/URL]
[URL]http://markingcodes.com/search/c/fs[/URL]Last edited by truclacicr; 06-20-2024, 01:24 PM.
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https://[url]https://de.farnell.com/...ikey.de/[/url][url]https://de.farnell.com/[/url]
[url]https://www.mouser.de/[/url]
[url]https://www.digikey.de/[/url]https://[url]https://de.farnell.com/...ikey.de/[/url][url]https://de.farnell.com/[/url]
[url]https://www.mouser.de/[/url]
[url]https://www.digikey.de/[/url]https://[url]https://de.farnell.com/...user.de/[/url]
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9B* = PMMT591A
[URL="https://www.mouser.com/datasheet/2/916/PMMT591A-2938678.pdf"]https://www.mouser.com/datasheet/2/916/PMMT591A-2938678.pdf
https://www.amazon.ca/pcs-Transistor-PMMT591A-SOT-23-SOT-23-3/dp/B0973VVTWT[/URL] (photo)9B* = PMMT591A
[URL="https://www.mouser.com/datasheet/2/916/PMMT591A-2938678.pdf"]https://www.mouser.com/datasheet/2/916/PMMT591A-2938678.pdf
https://www.amazon.ca/pcs-Transistor-PMMT591A-SOT-23-SOT-23-3/dp/B0973VVTWT[/URL] (photo)9B* = PMMT591A
[URL="https://www.mouser.com/datasheet/2/916/PMMT591A-2938678.pdf"]https://www.mouser.com/datasheet/2/916/PMMT591A-2938678.pdfLast edited by truclacicr; 06-09-2024, 06:47 PM.
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See [url]https://www.hpinfotech.ro/SED1530.pdf[/url]https://See [url]https://www.hpinfot...1530.pdf[/url]
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https://[url]https://rozetka.com.ua/...4228.jpg[/url][url]https://rozetka.com.ua/388889691/p388889691/[/url]
You can see a small DC blocking capacitor in this photo:
[url]https://content2.rozetka.com.ua/goods/images/original/353514239.jpg[/url]
[url]https://content1.rozetka.com.ua/goods/images/original/353514228.jpg[
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I think the OP has an amplifier on the antenna. This antenna is powered by a power supply, mounted either in the roof, or plugged into a wall outlet. The output socket of the PS connects to the RF input of the STB tuner via 75 ohm coax. The STB decodes HDTV channels, down-converts them, and feeds the content to the SDTV via HDMI.
There should be a blocking capacitor in the RF out of the PS....
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Can you show us the power supply for your masthead amp? Is it possible that you have switched the Antenna and RF Out connections???
I would have thought that the tuner in your STB would have a DC blocking capacitor, but perhaps not???
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This is a typical masthead amplifier setup.
[url]http://sm0vpo.altervista.org/antennas/preamp-0.htm[/url]https://This is a typical masthead a...mp-0.htm[/url]
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Have you tried repairing the board? What is the fault symptom? That PCB has several ESD protection components which can be removed if they are shorted (DS1, DS2, DS22, DS23).Last edited by truclacicr; 06-02-2024, 06:48 PM.
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