Question about Toshiba 42H81 42" Rear Projection Television

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Remote control will not work

The Remote is sending the signal, but the TV is not reading. Maybe the Sensor went bad

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  • Lucretia May 24, 2008

    The TV works but the remote wont work it.  The remote has new batteries and will light up.  My Toshiba has a split screen that I dearly love but I can only access it with the remote.  Since the remote lights up, I wonder about what reads it in the TV.  My Toshiba is a 42H83 42 inch.

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Sensor part # 23000852..mounted on PC board behind screens.
Remove lower speaker grill cover,then remove screen/frame assembly.....replace sensor...reassemble...............T.

Posted on Feb 07, 2008

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Since it works when close, more likely the battery in the remote is running low, or you have some dust over the remote sensor on the front of the tv panel.

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Here is your manual

Someone else with same problem

Seems like they you may have sensor problem, remove board and check solder connections and/or replace IR sensor bad pic below of toshiba sensor board below.

7151e29.jpg It should be hidden behind the smokey plastic cover in the right corner of set,

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Try another remote control, if it is also not working that means remote sensor in tv got bad and become unable to receive remote signals, replace remote sensor in tv.
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Two things are involved to cause that problem, tv remote control and remote sensor in tv.
Upon verification of remote working, it would be confirm that remote sensor in tv is defective and need to be replaced.
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1 Answer

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Hi I am Vortash , Its possible the IR detector has gone but unlikely , it is more likely that due to a low battery in a remote the signals have corrupted the remote processor this used to happen a lot with the old EMI and Bush sets and sometimes it is just a fact that the remote has given up the ghost . You can check to see if your remote is working with your Iphone or any phone camera . Put the phone on record and place the remote in front of the lens , if it is working you should be able to see the infrared diode flashing in the phones viewscreen . If it is working you will need to find out the de- corruption proceadure for your model of set hope this helps regards Vortash

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need nmore info then that. are u saying that the remote control is not working with the tv or are u saying that the controls on the set is not working . ok lets say the remote is not working 99 times the problem is the remote control unit. the best way to find out is. if your tv is a newone 1 -2 years old u could take the remote to best buy and see if it will work on a nother tv set there. if not it is your remote problem solved.if it does work then i could be the sensor but u need a scope to see the rf signal from the sensor i have only change 2 sensers in my 30 years working in electronice service field. let me know marty

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1 Answer

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The sensor is not the only fault that can cause the remote control to not work. The sensor is only one part of the circuits involved.

Between the sensor, there may be buffer amplifier stage, and then there is the main uPC.

What we do is send a remote IR data signal to the sensor, and on the circuit board in the set I follow the data signal along its path using a scope in reference to the service diagrams to see where the data loss is.

Personaly, I would not blindly buy a new sensor based on a guess without doing the proper tests.

Jerry G.

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Sounds to me like a problem in the tv, not the remote. A short maybe, or a bad connection somewhere.

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The TV does not pick up the sensor from the remote control. The remote control works fine with the other Sony TV. I try to replace the remote sensor on the TV, but I don't know how and where to buy.


Yeah! ... After extensive digging around, I found the service manual at the following location. You have to create an account to get the DL (9.3 Mb) and the site is in Spanish, but the manual is in in English. The remote sensor is on board HC and should be a simple fix:
http://www.clubdediagramas.com/archivo/tv-proyeccion-a224/sony-m838/kp-61v90-pdf-f7920.html

pxsdaemon

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