Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old February 2nd 21, 04:31 PM posted to sci.electronics.repair
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Default Samsung HW-E450 Soundbar


This unit appears dead, main fuse T4A has not ruptured but unit will not
power up, Any advice on what to check on the saps gratefully appreciated
,thanks


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Old February 3rd 21, 01:14 AM posted to sci.electronics.repair
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Default Samsung HW-E450 Soundbar

On Tuesday, February 2, 2021 at 9:31:12 AM UTC-6, David Barnicoat wrote:
This unit appears dead, main fuse T4A has not ruptured but unit will not
power up, Any advice on what to check on the saps gratefully appreciated
,thanks

Does it use a wall-wart transformer/power supply?

I'd start with that.
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Old February 3rd 21, 04:14 PM posted to sci.electronics.repair
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Default Samsung HW-E450 Soundbar

wrote:
On Tuesday, February 2, 2021 at 9:31:12 AM UTC-6, David Barnicoat wrote:
This unit appears dead, main fuse T4A has not ruptured but unit will not
power up, Any advice on what to check on the saps gratefully appreciated
,thanks

Does it use a wall-wart transformer/power supply?

I'd start with that.


No it does not use a wall wart, internal power supply with soldered in fuse
which is not open circuit.

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Old February 5th 21, 04:32 PM posted to sci.electronics.repair
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Default Samsung HW-E450 Soundbar

In article 351969505.634057982.756000.dave.barnicoat-
,
says...

wrote:
On Tuesday, February 2, 2021 at 9:31:12 AM UTC-6, David Barnicoat wrote:
This unit appears dead, main fuse T4A has not ruptured but unit will not
power up, Any advice on what to check on the saps gratefully appreciated
,thanks

Does it use a wall-wart transformer/power supply?


No it does not use a wall wart, internal power supply with soldered in fuse
which is not open circuit.


Have you got the service manual? If not, it's downloadable he
https://elektrotanya.com/samsung_hw-.../download.html

The troubleshooting flowcharts in the manual assume you're going to be
swapping out entire boards, but at least there are schematics to help
track things down to component level.

If you've confirmed that the fault is on the SMPS board, I'd check the
electrolytic capacitors (be sure to discharge them before touching
anything on the board) and high-wattage resistors (RS801, RA808) first,
as these are possible failure points that could be tested without
working on a live circuit.

The safety guide in https://www.repairfaq.org/sam/smpsfaq.htm is
extremely useful, particularly if you do end up having to investigate
the SMPS while it's powered up.

R
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Old February 7th 21, 12:36 PM posted to sci.electronics.repair
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Default Samsung HW-E450 Soundbar

Rayner Lucas wrote:
In article 351969505.634057982.756000.dave.barnicoat-
,
says...

wrote:
On Tuesday, February 2, 2021 at 9:31:12 AM UTC-6, David Barnicoat wrote:
This unit appears dead, main fuse T4A has not ruptured but unit will not
power up, Any advice on what to check on the saps gratefully appreciated
,thanks
Does it use a wall-wart transformer/power supply?


No it does not use a wall wart, internal power supply with soldered in fuse
which is not open circuit.


Have you got the service manual? If not, it's downloadable he
https://elektrotanya.com/samsung_hw-.../download.html

The troubleshooting flowcharts in the manual assume you're going to be
swapping out entire boards, but at least there are schematics to help
track things down to component level.

If you've confirmed that the fault is on the SMPS board, I'd check the
electrolytic capacitors (be sure to discharge them before touching
anything on the board) and high-wattage resistors (RS801, RA808) first,
as these are possible failure points that could be tested without
working on a live circuit.

The safety guide in https://www.repairfaq.org/sam/smpsfaq.htm is
extremely useful, particularly if you do end up having to investigate
the SMPS while it's powered up.

R


Thanks very much for the info re service manual/schematic and the repair
faqs. I will check them out, I know I have 380 volts dc at the bridge
rectifier output.
D



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