Question about Toshiba 57H81 57" Rear Projection Television

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Toshiba 57 H81

My screen started out being wiggly for the first 10-15 minutes it was on and then cleared up, not it is that way all the time.... I have read there are parts I can order and replace myself! Which sounds a lot cheaper than paying someone else $600 Anyone that could tell me what parts to order and where to order them from would be greatly appreciated!

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  • rectherp Feb 12, 2008

    Are you anywhere near the chicago area? The repair shop I talked to wanted $400 to repair it $150 to bring it to there store, or I could bring it there myself! I am going to ask my brother if he thinks he can take the problem on! Thank you!!!!!

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The problem sounds like the capacitors in the horizontal circuit. Replacing these capacitors will require knowlege in using a soldering iron and discharging capacitors. A capacitor is a device that will hold a DC voltage charge (direct current) If not discharged properly they will hold the charge and you could wind up being the path in which they discharge. This discharge can and usually does hurt. Also TV's do have lethal voltages in them and if not careful you could wind up in real trouble. After you discharge the caps, unsolder them you need to be sure to put the new ones in the proper way as they are going to be electrolytic capacitors and need to be put in properly (or they will blow up... trust me!!) After installed, the capacitors should be charged back up slowly. This is done by hooking the TV to a variac and power being brought up slowly when the TV is turned on. Some techs don't do this process but should be done to protect the new capacitors. After all this, you may have to tune the horizontal circuits again since the new caps could make the circuit no longer in tune. Not a common issue but may still be a issue. Anyway, you should be able to find a reputable repair shop who would do this job for about $100.00 If you still want to do this repair yourself, you can get the manuals needed at www.servicemanual.net. You can order the capacitors from mouser.com, digikey.com, alliedelectronics.com, matelectronics.com or a local electronics part store. A reputable repair shop should also warrant their work. For example, my company offers 30 days after repair on what we do. This way you have a little insurance on the repair job.

Posted on Feb 12, 2008

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I would suspect your power supply deflection board is failing. Normally these tvs have a problem with the hyper board in which the image is scrambled and then clears up. Your problem is just the opposite and indicates a part is heating up on the power board. A good visual look at the board will be your best starting point. Look for burn marks, a capacitor that is rounded on top or leaking. Also look carefully to ensure your CRT bulbs have not leaked fluid onto one of the boards.

It's a starting point.

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This model uses a "HYPER" BOARD to process all signal from all inputs.

These sets have a history of tiny surface mounted capacitors on that board failing with age---they dry out inside.

Usually it will clear up as the caps get hot but over time it will take longer and longer to clear up.

The board is no longer available from Toshiba and the only way to fix is remove the board and send it out for rebuild---last one I did cost over 200 for the rebuild.

I have had a few on this site with this problem who were able to do the repair themselves, it involves getting the board out and real skill at soldering.

If this told you something you did not know, rate this solution as very helpful as I do this here for free.

SD TECH

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65H81 along with several other models has a problem--I have the Toshiba Service bulletin that explains this.

Basically the set you have and others like it use what is called a HYPER board (circuit board) that processes all signal for the set from all inputs---the way the problem usually begins is lines/noise for the first few minutes and then it clears up---as time goes by the length of time to clear up becomes longer--at some point it will not clear up at all.

The Hyper board is Soldered in in most of these sets and not a do it yourself repair---yes--I had one other person who was on this site with the same set and problem and with directions and the photo of the board from the bulletin he was able to repair the board himself.

What is happening here is this board uses several surface mounted filter caps that begin to dry out and fail---caps that have lost value tend to try to function better after they get hot--hence the delay until the problem goes away.

This board is NO LONGER AVAILABLE FROM TOSHIBA--only two choices if you want it fixed--send it out to a company called PTS ELECTRONICS and they will repair it for you--last time I checked cost for them with shipping was over 200 dollars plus someone has to be able to get the board out safely and install it back after it is repaired.

Second choice is to find someone who can replace the 10 caps indicated in the bulletin (there is a photo showing which) which should cost under 25 dollars parts wise--Understand--most sets use filter caps that have two leads---the leads go through the circuit board and are soldered to the bottom of the board--these sets use tiny caps with little tabs soldered to the TOP of the board--you have to be very careful removing them not to damage the board.

If you want I will try to post the bulletin for you to look at--it is acrobat reader and may or may not post well.

If this information has helped you rate this solution as I do this here for free.

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http://servicemanuals.vstore.ca/

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Hire a skilled,senior tech willing to rebuild your board....
replace all bad caps.......good as new.................T.

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