Question about Toshiba 43H71 43" Rear Projection Television

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43h71 flashing power light

I know its been posted already but befor i go and spend the time and money on convergance chips can any one tell me a sure fire wayof telling if thats whats wrong for sure?

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  • lucked Nov 04, 2008

    Is there anything elese that can cause the red blinking light problom a bad horz output maybe?



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Remove ic's and see if it fires up..

Posted on Oct 20, 2008


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I got this set from a friend. I know it needs convergence ic's. It doesn't turn on, power light blinks three times. At the first attempt to turn on, high voltage circuit powers up, then resistor in...

I would prefer you stay with the original STK number but spending extra cash for unproven "better product" isn't safe in my book. Just change the 2.2ohm resistor you saw glow but carefully test all others. It's nice of them to put a kit together but not necessary. The last convergence job I did was more about getting the board out nicely than soldering the packs in. Worked great and saved loads of money. Hope yours goes as well. I didn't need any of the resistors I purchased.

Dec 19, 2010 | Panasonic PT-53WX42 53" Rear Projection...

1 Answer


I think I already tried to help you.

2,2 is short protection--98% chance one of the two pico fuses that protect the convergence circuit are bad.

This means the fuses and both STK-392-570 chips need to be replaced.

If you reply to this post I can post step by step instructions and photos of the fuses and the chips.


sd tech

Jun 10, 2010 | Mitsubishi WS-55819 55" Rear Projection...

1 Answer

43H71 flashing power lamp

I am going to give you a general idea of what to look for.

First: the set has several pico fuses on the power board--green or orange and look like resistors--check all them first.

Second: the most common problem these sets develop is a short in the convergence circuit--if it is bad enough fuses will or will not blow and the set will shut off just blinking--If I was working on it I would locate the two STK-392-110 convergence chips which are usually in the middle of the set on heat sinks--not real easy to get at but what I would do is UNSOLDER all 18 pins on each chip and then see if the set turns on.

If it does come on convergence will be awful but you will know your trouble is there. Two of the fuses I mentioned protect this area--usually 5 amp. I will attach a photo of what they look like (for a different brand but same kind of part) so you know what to look for.

If this is not your problem you would need a schematic to troubleshoot by checking for physical shorts or missing voltages etc.

While the chips are not easy to get at---they are the second thing I would look at.

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


First pix shows what fuses look like and second what chips look like.

Dec 18, 2009 | Toshiba 43H71 43" Rear Projection...

1 Answer

The red can not be adjusted, the center area is ok, but the bottom and upper can not be alligned, it is out of range when we tried the multpoints convergence

If red or blue will not adjust in some direction you need to replace both of the two STK-392-120 convergence chips this set uses.

Clearly I do not know what level of skill you have, but I can give here pretty good instructions on how to do it--I have repaired hundreds of sets with Convergence problems.

First--they reason the chips fail is they are Black in color----about 2 1/2 inches wide X 1 1/2 inches tall and each has 18 pins. They are mounted to identical metal heat sinks on the left side of the set as you look from the back. They will each have the STK-392-120 printed on them in white letters.

When they are attached to the heat sinks--they use a metal band you can pop off from one side--they apply a white grease to the back of each chip--it is there to move heat fast from the chip to the metal it is clipped to====after several years it dries out and one of the chips cannot stay cool enough and fails.....

You can buy a pair of chips on Ebay for less than 14 dollars plus shipping--I can tell you the seller to look for as I buy all mine from them. About the only other part that fails is there are pairs of resistors that are light green in color around them--they are all 6.8 ohm and if any are burnt or discolored in the middle they are bad--you can look inside the set at them and usually see if they are bad--best way is to check all of them--like checking a fuse---

You need to have certain skills--you will have to gain access to both chips and the resistors and be able to solder---I can tell you the best way to approach this if you have soldering skills

If you replace both chips and or resistors and then adjust the set with the original remote--the set will not have the same trouble for 5-8 years--there is after the repair is done a TECH menu that I can tell you how to get into with an original remote to completely adjust convergence.

Considering that most shops get at least 300 for this kind of repair, if you are able to do it yourself--you save a lot of money and do not have to replace the set with something that costs a lot more---total parts cost should be under 25 dollars!

If you think you can do this yourself--I will assist you--once someone gives me a vote here on my solution--I keep helping them until they either have it fixed or decide not to attempt it--I am here to help people.

Do you know how to solder? If I tell you how to get at the Chips and resistors can you do it?

if you cannot repair it yourself 300 may in these times not be worth your while--which way would you like to proceed?

I HAVE REPAIRED HUNDREDS OF SETS WITH CONVERGENCE PROBLEMS--I DO KNOW HOW TO DO IT AND WHAT I AM TALKING ABOUT---I know what it means to not want to spend a ton of money if I can fix something I already own.


KEEP IN MIND I AM IN CALIFORNIA--possible difference in time from where you live.

Regards, SD Tech -------Steve

Oct 17, 2009 | Televison & Video

1 Answer

Tv was blurry them turned off and wont come back on and the red light on front blinks

The blurry must be defined as out of convergence or out of focus,If there is a lines of color on the pictures edges, its convergence, if the picture is not sharp the focus is the problem.The common cause of convergence problem is the convergence drive chip(stk) and might be the cause of shutdown too.The focus problem is commonly contributed by the projector lenses, in most cases the coolant liquid leaks and drip on the board, this causes shutdown too.The lenses must check first for any leak before the replacement of IC(stk).

Sep 23, 2009 | Toshiba 43H71 43" Rear Projection...

2 Answers

Flashing green light when i hit power button

2 blinks and two blinks is short protection for this model---most likely one or both of the fuses for the convergence chips are bad--FAo4 and FA05--set detects this and no voltage to the convergence chips and shuts down instantly---this model uses 2 STK-392-570 convergence chips--both with the fuses and any of the blue resistors in front of the chips(they are blue in color and marked 3.9 ohm) that are bad need to be replaced and the set adjusted. I can send you photos of a simular board if you want to know what the fuses look like and the resistors All these parts are located on the middle board(set has 3 main boards) I have detailed instructions for a step by step start to finish repair of this set--if you are able to do the repair yourself you can buy both chips (and the fuses etc) On Ebay--a pair of chips for this set costs about 14 dollars plus shipping.

If you cannot do this repair yourself--look in your area for someone who has done this before--almost any good tech can do it in your home in a hour---some shops charge 300-400 for this kind of repair--I have done hundreds of them here for 200-250 total. If a shop tells you it has "to go to shop" keep looking----now is the slow time of year for TV repair shops--The other person who suggested here it is a problem on the DM board did not read your post --he is speaking about a DLP set made--does not apply to your set--200-250 is a good investment and you cannot replace a set like this for that kind of money--once the chips are replaced the set should not have a convergence problem for 5-8 years.

If you have any questions or need the instructions :

I do this here for free so if this has helped you take a minute and give me a vote here.

unlike some other people here--i know what I am talking about

regards, SD TECH

Sep 05, 2009 | Mitsubishi WS-55809 55" Rear Projection...

1 Answer

Convergence Board (I hope)

check this out I have the same problem check your solder spot make sure the solder points are not touching one another, that could be one of the reason is doing this or just to make sure you can desolder the stk chips clean the holes where the pins go trough the board and power the tv with board and if the tv start fine if could be bad stk chips be very careful when desoldering or soldering good luck about another is not worth it they cost too much around 350-450

Oct 06, 2008 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Flashing power light on JVC 48W TV

Tri to remove the concergence pcb assy and start the Tv.If the TV is working just replace the convergance IC.

Feb 11, 2008 | JVC AV-48WP74 48" Rear Projection...

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