Question about Toshiba 50H72 50" Rear Projection Television

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Resistors on toshiba 50h72

Got great info on convergance issue from u guy' say that a resistor may be blown. will a simple ohm test on the resistors tell me the failed one. can you also push me in the right direction of said resistors becuase with my luck i'll change them all. this is all new to me as i'am not a electornics repair man but have enough knowledge to do the job how do i also determine the 1/2watt resistors as they are rated by ohms ?yes/no.

P.S would a service manual help me out? thanks again you guy's have been great.Also time and money saver for the do it youself kinda guy.

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  • vmarch Mar 02, 2008

    my tv is 5yrs old and had an extended warranty that expired 3 months before problem happened. The blue convergence is out of wack it can be adjusted on 9 diffrent spots but it will not allow me to make any adjustments... I really don't want to put it to the curb yet ,i have pic but blue shadows on images i need help to fix nearest toshiba repairshop is 90 miles from me

    any help is apprecciated



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The resistors are located right next to teconvergence ICs.An ohms meter will check them often you have to lift one leg out of circuit to test as they have to be within 5% tolerance. You cant miss the resistors right next to the ICs heatsink their should be quite a few of them all identical.

Posted on Feb 10, 2008


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1 Answer

Toshiba 50H72, replaced IC's, but colors still not lined up correctly. Did not replace resistors. Manual states to use 1 watt, 1.8 ohm resistors, are these correct or do I need to use something...

The error codes only indicate the convergence circuit is not working.

In this set it is VERY important to check the 1.8 ohm resistors, if even one is open the convergence will look bad.

These sets are not real easy to get at the chips etc, and I learned the hard way a long time ago to check all the resistors, if needed unsolder one end of each of the 1.8 ohm resistors and be sure all are GOOD.


Jan 03, 2011 | Toshiba 50H72 50" Rear Projection...

2 Answers

Need resister

DIgikey should have it. It is a 2Ohm 1 watt resistor.

Feb 08, 2009 | Toshiba 50H72 50" Rear Projection...

1 Answer

Blue light (RGB) will not converge (Toshiba 50H72)

Look around the area of the STKs and you should see some low valued resistors. One lead of which will be attached to the STKs. One or more of these is open. Replace it/them and you should be fine. These are current limiting resistors (effectively fuses) for the power to the STKs. One of them is not getting power.


Jan 23, 2009 | Toshiba 43H70 43" Rear Projection...

1 Answer

The red seems to be out of place on my toshiba 50h72 projection t

Replace both convergence ICs they are stk392-110 you will also need at least the six 1.8 ohm 1watt resistors. You can get replacement ICs and resistors at the following link and they provide free installation instructions so you can do the repair yourself.
heres the link.

Jan 18, 2009 | Toshiba 50H72 50" Rear Projection...

1 Answer

50h72 replaces ic's but still don't work

Did you replace the convergence resistors along with the Ics? Also if you replaced the ics with open resistors you have most likely ruined the new ICs. You can get a convergence repair kit for your model at the following link which has the ICs and the resistors for your model, and they provide free tech support and instructions.
Heres the link.

Oct 25, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

Samsung HCN4226 Convergence.

Did you remove one side of the resistors from circuit to check them? If you leave them in circuit a blown resistor will test good as it will read the resistance from the surrounding resistors. Usually its the 3.9 ohm resistors identified bu the bands orange,white ,gold and red. and also the 150 ohm identified by the bands brown, green, brown and gold

Jun 23, 2008 | Televison & Video

2 Answers

Put new ic chips in and the problem still exsists

Many times when the convergence modules go bad, they blow some of the resistors that feed it power. Look for little small low resistance resistors right in the vicinity of the modules.
Hope Ya Fix It.

Feb 08, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

Convergence problem???

Check the resistors by the STK ic's, should be 2.2 ohms. Under the heat sink, also check the 1.8 Ohm 1W, fusible resistors found around the area as well.
Good Luck.

Feb 05, 2008 | Toshiba 50H72 50" Rear Projection...

2 Answers

Toshiba 43HX70 convergence fix - now no video

I think the hardest to solve problems are those I installed!!
Where do we start==no lecture,but I never change a resistor
unless it has changed (in value!) Use a digital meter and check
the value of each resistor.Toshiba is a bit confusing as to values
of each resistor and location in relation to the IC's.Go over your own work first.Check micro fuses in power supply=F851,F852,
etc. Carefully resolder steel jumper wires at board edge,they feed
B+ to convergence amp circuit.Be sure to verify no shorts in pins
of IC's.(use your meter).........T

Oct 25, 2007 | Toshiba 43HX70 43" Rear Projection...

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