Samsung hw-j355 Soundbar Not Powering On

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Soundbar

Repair information and disassembly guides for standalone TV soundbars.

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zack lore @zacklore

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发帖于: 2025年2月27日

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Samsung hw-j355 Soundbar Not Powering On

Bit of a rookie here...

I have a Samsung HW-J355 Soundbar that no longer powers on. I have fixed small obvious things in the past but there are no obvious faults and I am trying to diagnose this problem. Anyone out there who can guide me to anything that would help me (a beginner) diagnose a power issue on a board where I do not have schematics or anything of that nature? Or does anyone have specific experience with this Soundbar that can help?

Images:

UIC1 Images

UIC1 Images 2

UIC1 Caps Image

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oldturkey03 @oldturkey03 声誉积分: 813.9千 1.2千 920 2.4千 · Answer 1 · 2025-02-27T20:51:51-07:00

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oldturkey03 @oldturkey03

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@zacklore time to open it up and to check a few things. Main part to check is the power supply and the main board but we will have to see your board. Post some good (large and well focused image) with your Question. Here is the guide for that 在已经存在的问题里加入图片

I do have the manual for the Samsung HW H355but to make sure that the contacts and IC's to check are at least close to the same as on your board, we will have to see it.

@zacklore thank you for those images. Looks like the boards are identical to the one in the manual. Nothing obviously damaged from what I can see so go ahead and follow the No Power flowchart. Let us know what you find out.

@zacklore

What happened to that corner? How come it's all chewed up :-)

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Thanks for your help. I have added a few images (hopefully they are clear enough). If you need more or something specific, please let me know.

由 zack lore 完成的 2025年2月28日

@oldturkey03 I checked the PCN1 voltage and that seems to be okay. I am now trying to check pin #62 of the UIC1. I added 2 more images... assuming that is the correct chip we are looking at, can you help me find pin #62? This is still very new to me and I tried looking it up but I did not get much helpful info. Thanks again for your help so far, I appreciate it.

由 zack lore 完成的 2025年3月2日

@oldturkey03 Ha ha... the corner just has gray/silver marker on it, from the manufacturer I imagine. This is the first time I have opened up the board this far.

I am only getting 2.6V on that pin not 3.4V. Does that mean that chip needs to be replaced?

由 zack lore 完成的 2025年3月2日

@zacklore check that particular trace and see if there are any components that look damaged.

由 oldturkey03 完成的 2025年3月2日

@oldturkey03 I added 2 more images. The trace leads to that hole (a via?) so I checked the other side. I don't see any visual evidence of damage. I tested the caps near there and got beeps from them so they seem to be okay. Any other ideas on where/what to check?

由 zack lore 完成的 2025年3月3日

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Soundbar

Samsung hw-j355 Soundbar Not Powering On

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Update (02/28/25)

Update (03/02/25)

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