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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?
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?
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.
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.
tschw...@aol.com <tschw10117@aol.com> 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.
tschw...@aol.com <tschw10117@aol.com> 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.
In article <351969505.634057982.756000.dave.barnicoat-
btinternet.com@News.Individual.NET>, dave.barnicoat@btinternet.com
says...
tschw...@aol.com <tschw10117@aol.com> 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 here:
https://elektrotanya.com/samsung_hw-e450_sm.pdf/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
In article <351969505.634057982.756000.dave.barnicoat-
btinternet.com@News.Individual.NET>, dave.barnicoat@btinternet.com
says...
tschw...@aol.com <tschw10117@aol.com> 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 here:
https://elektrotanya.com/samsung_hw-e450_sm.pdf/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