Question about Toshiba 43H70 43" Rear Projection Television

4 Answers

Toshiba 43" 43H70 Projection TV - Remote Sensor not working

The remote sensor is not working. New remote and it doesnt work either. Is this something I can repair? I am electronically inclined.
Thanks for any help

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  • 9 more comments 
  • railroadman2 Dec 30, 2007

    I still dont see a reply about how to REPLACE the remote sensor.

    I need to know that.

  • railroadman2 Dec 30, 2007

    where do I find a part number for the remote sensor Toshiba 43" 43H71 Notice the model number is not 4370 but is 4371. Also can I take the front lower panel off the television and find that sensor there?



    Thank you

  • railroadman2 Dec 31, 2007

    Ok, I downloaded the Service Manual, removed 4 screws that are supposed to remove the front panel on the tv where the remote is behind, nothing moves. Its tighter than a lid on a jar of kraut, only Im not afraid to apply pressure to a jar lid. What should I do? I am certain I can remove and replace this, Im no stranger to electronics but have never opened this large a tv. Anyone been in this unit and how can i get it open to get in to the sensor. The manual shows only removing 4 screws, thats not working.

    Thanks for any help.

  • railroadman2 Dec 31, 2007

    This issue was never intentionally marked as resolved. If it had been I certainly would not continue asking questions. A window popped up so quickly when I read the first response to my question and evidently that window rated it, but I tried to cancel out the window. Sorry if anyone is feeling slighted by me not rating anyone but frankly I cant see a way to do that. I paid for the service, it is nice for those who have responded to continue to assist me.

  • railroadman2 Dec 31, 2007

    I remember the voltage issue but dont you have to get the cover off the front of the tv to check the voltage? Please tell me how can I rate any techs here? There seems to be no button for rating anyone.


  • railroadman2 Dec 31, 2007

    The grill removed with some gentle prying but that does not expose the controls. The screw holes you see in the pic on the right is where the Manual indicates removal and those are out. No way is the front coming off by that alone. Yes believe it or not, the picture does not exactly match the tv because if it did those screws would release the front. Wouldnt be the first time Ive witnessed that! Thanks for those who will continue to help me, for you there in Austrailia, forget about it and your attitude is inappropriate.





  • railroadman2 Dec 31, 2007

    Salt56 and others. The front is off!!! Yeah! No help from the manual drawing, there were several more screws on this front to be removed. Now to locate the sensor.

  • railroadman2 Dec 31, 2007

    Guys we are looking at a 8 page manual and at least one page is blank, nothing in this manual lists location of sensor, nor is it in parts list. The drawing that does not show location of ALL the parts either. Nothing showing location of sensor. He took the front of the control panel where the on and off switch is located. Here are 2 pics of what we are looking at:

  • railroadman2 Dec 31, 2007

    Ok. We have not found the remote control sensor yet! The works on the tv are wide open and since the REPAIR manual doesnt show a schematic, maybe I was ripped off on the manual I downloaded for 7.99 from Ebay. Wish I had SOME idea where it is located, the size of it, etc. Can anyone point out what a sensor even looks like, which one of these boards is it on? Well this is the last shot. We are calling in the professionals.


  • railroadman2 Dec 31, 2007

    I will be back at it later today. Sorry but I was worn out from work and confused by this tv last night, gave up. Will try later removing the back. My wife found a schematic now and I see what the sensor looks like but still believe it is not in the front of the tv. Yes, I forgot to tell you earlier, we have tried everything with the remote, even replaced it with one Toshiba brand, we dont use universal. The remote seems to be working with the radio. Thanks Dan

  • railroadman2 Dec 31, 2007

    I believe it is Soul Visitor that put the links up to me, thank you for that and comments. My apologies for the snappy come back. I dont see much to explain the process well regarding rating prior to selling the service. At least it didnt stand out. When I said I cancelled out a window yesterday and ended up rating this and marking it solved, that was so quick that I really saw the screen out of the corner of my eye and cancelled it out or thought I did! No way was this issue settled with the first tech reply. The rest of you worked harder than that to help me with this issue.

    Dan

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4 Answers

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  • Toshiba Master
  • 1,113 Answers

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.

Toshiba 43 It should be hidden behind the smokey plastic cover in the right corner of set,

Posted on Dec 30, 2007

  • 5 more comments 
  • Soulvisitor
    Soulvisitor Dec 30, 2007
  • Soulvisitor
    Soulvisitor Dec 31, 2007

    This problem has been marked as solved.....only us that have answered you in past will see this thread, you have selected AvioriX as having solved this problem.



    I along with the others are unrated, it is not fair for me/us to spend any further time on this issue whilst someone else holds the glory and us other experts are just left rejected/unrated



    Post a pic, can't see why the manual would be wrong, hard to tell you, can't see it myself.



    Salt56 is a TV tradesman but what are the chance of him remembering and knowing your exact tv and changing same component, I would tell you to pull it harder and wisely probally just a little stuck

  • Soulvisitor
    Soulvisitor Dec 31, 2007

    I think there is no ability to rate because It has been done, thanks for trying. The only reason I spoke of it was because it was getting between me and the problem in my head, all is well.



    Thanks..Back to problem...


  • Soulvisitor
    Soulvisitor Dec 31, 2007


    Notes on the Troubleshooting and Repair of Television Sets
    Version 3.26 (4-Sep-07)
    Copyright © 1994-2007
    Samuel M. Goldwasser
    --- All Rights Reserved ---

    For contact info, please see the
    Sci.Electronics.Repair FAQ Email Links Page.

    Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied:


    1. This notice is included in its entirety at the beginning.

    2. There is no charge except to cover the costs of copying.


    Problems with the IR remote receiver
    Although the hand unit is most likely to be the cause of any problems with the remote control, it is also possible for the IR receive module to fail or for power to it to be missing. Microcontroller problems as well can result in similar symptoms.

    First confirm that the hand unit is putting out the correct code. If it is a programmable type, try re-entering the settings for your TV. Install a set of fresh batteries. Try a different remote if possible. Use an IR detector to verify IR emissions (see the section: Revival of dead or tired remote control units).
    The IR receiver is often a self contained module connected to the rest of the TV's circuitry by 3 wires: Power (+12 V typical), Ground, and Signal Out.
    The IR receiver module will be located directly behind the IR window. Test by confirming that DC power is present. A schematic will tell you exactly what it should be but figure on 6 to 12 V if you do not have one. If this is present and you have an oscilloscope, put is on the Signal Out. You should see the demodulated data stream corresponding to whatever key is pressed on the hand unit. It should be a logic level signal swinging between 0 and the supply or +5 volts.
    If there is no power, then a bad cable connection or blown fusable resistor may be the cause. If there is correct power but no signal, a fault internal to the IR module is likely. The internal circuitry may be a combination of special ICs and discrete components. The Sams'' or service manual may or may not provide the details. There may be an adjustment for the carrier frequency but don't be tempted to touch this unless you have exhasuted other possibilities - and them mark it first!
    If the signal is present, then there may be a problem in the microcontroller or other logic on the mainboard. This will require a schematic to proceed further

    Whatever you wish.

  • Soulvisitor
    Soulvisitor Dec 31, 2007

    Thanks for the feedback salt56.





    p.s. It's probably behind the screen, inside the cabinet near the lenses/mirror. You should be able to access by removing the back of the Tv.

  • Soulvisitor
    Soulvisitor Jan 01, 2008

    If you see this post you will notice it seems to be very close to your model and notice that this owner has moved the board, but he speaks of behind the screen as original location and wires going to board are coming from inside tv.

  • Soulvisitor
    Soulvisitor Jan 08, 2008

    In the 66 page service manual from nodevice, we find the missing link









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  • Expert
  • 689 Answers

It might require a qualified hands on tech. But by my experience remote sensor at the TV side wont have malfunction easily. You can still think about the Remote. You can test remote control by your own. How? You need to have a portable AM radio (MW). while pressing the buttons of the remote control you can move the tuning dial (Remote control should be close to the radio within 5inches). If you hear patterned sound it shows remote control is working. The AM radio method is well known and it has over 85% success rate for all kind of IR remote controls fail isolation. You can also try with known working remote control of other devices to understand the method. If remote control test shows that it works contact to service. Please send new posts if you need further assistance.

Good Luck

Posted on Dec 30, 2007

  • ExpressFiX
    ExpressFiX Dec 30, 2007

    Hi again

    Here is the Toshiba Technical support hotline for TV products
    800-631-3811
    They will help you to obtain the parts that you need.

    Good Luck

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  • Master
  • 373 Answers

I can only tell you that the sensor must work with 5 volts DC and if it is not there or too low the remote will not work. If too low there could be a capacitor keeping the voltage down and I couldn't tell you which one. I am assuming the tv turns on manually. The sensor should be located on the keyboard and is usually a dark red in color device. The sensor itself may be at fault. and must be replaced with exact replacement. If you bought a universal remote recheck and do the programing carefully again just to be sure.

Posted on Dec 30, 2007

  • 9 more comments 
  • TV Doctor
    TV Doctor Dec 30, 2007

    To remove sensor use desoldering brad with good soldering iron is best to clear out the two holes for insertion of replacement. can get good desoldering brad at Radio Shack 5 ft roll. It is a meshed copper brad

  • TV Doctor
    TV Doctor Dec 30, 2007

    The desoldering brad will remove the old soldered in sensor as well as clear the holes for the replacement.

  • TV Doctor
    TV Doctor Dec 31, 2007

    Can you remove the speaker grille? Is that what you are trying? Usually after the screws are removed the grille should pry off carefully and if you get it off look for screws up under the bar just below the keyboard buttons closer to the ends. Or there may be screws on the sides at the edge of the grille looking at them from the back of the set. Hope this helps

  • TV Doctor
    TV Doctor Dec 31, 2007

    Congrats to AvoriX However if you need my help I will be glad to assist. Remember the 5 volts? It needs to be on the sensor. If low there could be other problems. But I hope the sensor is all that is wrong!

  • TV Doctor
    TV Doctor Dec 31, 2007

    Soulvisitor: Your post is well written and with links and all. I would like to help this person too and am racking my brain also. Only thing I am thinking now is to remove the screen if the manual will tell how. It should to be able to clean the lense from the dust that does accumulate. Can you try that?

  • TV Doctor
    TV Doctor Dec 31, 2007

    Glad you got the grille off Way to go! It looks like you need to be friends with Soulvisitor if I may ask. He has offered a lot of proper information that is valuable in this repair. If you have a volt-ohm meter find a good ground for the black lead (ground should be on the keyboard) and the power tact switch should have 5 volts dc with red lead and ground close by Keep trying til you read a voltage of some kind. As long as the tv cuts on manually there is not much circuit for the Infra red detector but could require a schematic. Maybe not. the sensor or infra red detector most of the time will be dark red in color behind a small window you can hardly seen through about 1 inch by 1 inch. See if you can find it.

  • TV Doctor
    TV Doctor Dec 31, 2007

    I had to go to the store. Did you read my description of the sensor? It may be mounted back inside the set close to the mirror as I remember some are. Don't give up just yet!

  • TV Doctor
    TV Doctor Dec 31, 2007

    Im sorry you haven't found it but one last try if it isn't on the keyboard then is must be back in the set toward the back and you will have to take the back off the set to see it with a wire going to the chassis. there are so many different types of projection tv's even the same name brand will be different. I will stay up until I hear from you.

  • TV Doctor
    TV Doctor Dec 31, 2007

    Good pictures and a good job troubleshooting. Hope you get it fixed!

  • TV Doctor
    TV Doctor Dec 31, 2007

    i.e. I sincerely hope YOU fix it railroadman2

  • TV Doctor
    TV Doctor Jan 01, 2008

    Hi,

    Glad you will get back at the tv. I have been there and done that with fustrations of working on them. You just have to get away for a while and refresh your mind. I will gladly help you all I can if you need it. I will be watching this post for a while.

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  • Master
  • 2,427 Answers

Yeah you just need to change the sensor ou can take it apart and search for one on line of check your local eletronics shop

Posted on Dec 30, 2007

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