Question about Honeywell Programmable Thermostat Heater

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T8411r1028 honeywell thermostat

No pwer blank screen

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  • volkerchrist Dec 17, 2008

    the thermostat is blank and it tripped we think the breaker in the garage any suggestions please

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Also check the water sensor in your drain piping if you have one. If it's sensing water backing up, it will blank that display.

Posted on Oct 06, 2009

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Check in the heating unit itself for an automotive style fuse.

Posted on Dec 18, 2008

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Posted on Jan 02, 2017

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1 Answer

When testin a power supply or led board on tv do i test dc or ac with multimeter?


Your power supply board is working if you get audio and imgaes.

You test AC only the AC side of the transformer before the Rectifier Diodes. Everything after the Diodes will be in DC.

did you get to see any spec of backlight as shown in
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Reasons for a Blank Screen on a Honeywell Thermostat ...

homeguides.sfgate.com > ... > Real Estate Rental & Lease Basics
Honeywell and other brands of programmable thermostats typically show a blank ...and the batteries can no longer provide power to the screen, it will go blank. ...electrical system, a blank screen indicates there is no power going to the unit, ...

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My RCA L32D10 screen comes on but then black horizontail lines appear and then goes blank, the picture then reappears and slowly degrades with black lines and becomes fuzzy. This has happened twice ,


If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

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No video signal to pc monitor


does the pwer light come on? might be the internal bulb has gone dead. if you look really close can you see the screen just barely? if so then its that, if not then its not that hope this helps..

Jul 12, 2012 | HP Computers & Internet

1 Answer

The TV screen goes blank and there is no sound...if we wait for awhile...the picture reappears.


you should bring your unit to a qualified service pesonnel, problem like this is not a DIY act unless your a professional serviceman.

here are the check points
power supply,
X or Y sustain board,
bad screen (PDP panel),
logic board,
buffer boards

these sections of your TV are replaceable board.
the least you can do is just replace first the bulging/deformed capacitors.
begin with the power supply section..
after replacing try to pwer on again

good luck!

Feb 08, 2011 | Sony KDF-E55A20 55 in. LCD Television

1 Answer

The thermostat worked correctly for months then


Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need

May 10, 2010 | Honeywell Programmable Thermostat Heater

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