Question about Toshiba 52HMX84 52" Rear Projection HDTV-Ready Television

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Toshiba 52hmx84 shutting off

This is my second bulb on my toshiba 52hmx84 while watching it shuts off and try's to start back up. I try to start up but no picture but sound. Shut off again' turn on picture works for awhile what's up with it piece of junk just did it again

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  • elliott6969 Nov 22, 2008

    and plays again

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When the bulb on one of these Toshiba DLP units burns out, the unit will show a blinking green and a solid red, and restart itself 8 times, then show blinking green and red lights. A replacement bulb costs about $200 and is very easy to replace. If you replace the bulb and the symptoms continue, the problem is probably the ballast. The manual and Toshiba support will direct you to an authorized service center, but if you are ambitious and want to save the expense, here are instructions for replacing the ballast yourself. First, many thanks to those of you who have done this before me and posted elsewhere. There was a request for pics of the ballast board install, so here it is.

FULL DISCLOSURE AND WARNING: YOU ARE ON YOUR OWN AND I WARRANT NOTHING FROM THESE PROCEDURES. I AM NOT A TV TECH. THERE ARE SOME VERY HIGH VOLTAGES IN THE BACK OF A TV BECAUSE OF THE LARGE CAPACITORS. BE CAREFUL. THERE ARE ALSO MANY DELICATE CABLES AND CONNECTORS IN THE BACK OF A DLP TV. PROCEED AT YOUR OWN RISK! IF YOU ARE UNCOMFORTABLE WITH ANY OF THE STEPS, CONTACT A TV TECHNICIAN IN YOUR AREA TO DO IT!

You will need:
1. A slightly long standard head Philips screwdriver.
2. A leatherman or small pair of pliers.
3. The Toshiba service manual. Refer to it often if you get lost. - download it here.
4. The ballast board (Toshiba Part Number: 23122468). I got mine from Conn's in Flordia here.
5. Some tape or a marker to label some of the cables so you don't forget what went where.
6. Patience. Lots of it. toshiba 52hmx84 shutting off - smile.gif

The Steps

1. UNPLUG THE TV! Put the TV somewhere so that you can easily get to the back of it. You'll need at least 3 ft of room behind the TV. REMOVE THE LAMP ASSEMBLY NOW.

2. Remove all of the screws on the lower part of the TV. Set the cover aside. It should look like this:

fc5ad1b1.jpg

3. To get an idea of where we're going, as you look at the back of the TV, just behind the fan and lamp assembly is the ballast board, looks like this:



4. Next, remove the screws from the silver brace arm in the middle and the bronze screws that hold the light engine assembly. This brace is attached to the ribbon cable by a Zip tie; you do not have to cut the Zip tie if you don't want to. Refer to the service manual if the pic below doesn't show the screws clearly, but it will be obvious when you are looking at the "ltoshiba 52hmx84 shutting off - 9b694bf2.jpgsled".

9b694bf2.jpg

5. Remove the bronze screw holding the plastic shield that angles down to the lamp. This screw is kind of hard to see just looking at the back of the TV, it is located up and abovetoshiba 52hmx84 shutting off - 18abb633.jpgcable attached to the back AV board.

18abb633.jpg

6. Using a small pair of pliers, squeeze the plastic nipples in and push the cable hangers out of the pltoshiba 52hmx84 shutting off - e7e5f5a9.jpg. Remove the shield carefully from the back of the TV and set aside.

e7e5f5a9.jpg

7. Slowly and very carefully, remove the copper ribbon cable as shown. This copper ribbon cable was the hardest thing to put back in during reassembly, I kid you not. I hate that ribbon cable with all of my soul. Next, remove the yellow, blue, and red connectors as shown. Itoshiba 52hmx84 shutting off - fd248cd9.jpg where they went, the connectors are different lengths and only go to one and only one receptacle.

fd248cd9.jpg

8. Slowly and carefully, pull out the light engine assembly. There are 2 yellow leads that power the lamp assembly that you can remove if needed. To remove them, slide the rubber footing off, and you will see a very small clip, push the clip back while pulling on the lead and it will come off. If you do take the leads off, be sure to label them with a marker or some tape. Mine were quite stubborn in letting go (I didn't see the clips under the rubber footing before this posted), so I left them on. If you do leave them on, be carefull of the stress on the cable going around the letoshiba 52hmx84 shutting off - 8ed15863.jpg I removed the cables from the plastic do-hickey holding onto them and moved the yellow cables to the front of the lens assembly.



9. Next, slowly pull out the light engine sled and turn it so that ytoshiba 52hmx84 shutting off - smile.gifccess to the ballast assembly, like so:



10. Noticing how filthy your ballast board probably is , remove the two screws holding the ballast board.

13f0edf4.jpg

11. Now, remove the 2 connectors attached to the ballast board like so:

e2e3539a.jpg

12. Next, gentoshiba 52hmx84 shutting off - 8d8ac6b6.jpg plastic tabs holding down the ballast board to the light engine assembly and gently push up the ballast board to loosen it from the plastic tabs grip. There are two other tatoshiba 52hmx84 shutting off - ee3d4539.jpgher side. Now you'll now be able to remove the ballast assembly entirely to install your new board.

8d8ac6b6.jpg

13. Now, on the ottoshiba 52hmx84 shutting off - a92acb87.jpgthe ballast assembly is the lamp connector. Remove the screws as shown.

ee3d4539.jpg

14. Gently turn the lamp connector towards you to remove it; notice the orientation of the connector so you install it correctly when you put the new board in.

a92acb87.jpg

15. Now, install your new board and put everything back together in reverse order. This would also be a good time to take some compressed air and blow out all of the dust in there. Take your time during reassembly and be very, very, very carefull connecting everyting back together.

16. Be sure to put the back cover on, and re-install the lamp assembly before connecting your inputs and powering back on.

17. That's it! If you did everything carefully enough, you should be enjoying your Toshiba again and just saved about $350! Congrats!

Posted on Dec 16, 2008

  • JoeSGriffith Dec 16, 2008

    Sorry, FixYa removed the pictures from the solution after I posted it, so the instructions are not very useful.

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