Question about Toshiba 50H71 50" Rear Projection Television

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Replacing Convergence IC's, I found a bad resistor needing replacment

I found an open resistor R7711, not sure of the value because it's slightly discolored from the heat. I was looking for the service manual with the part descriptions. Do you have a manual or download? Other resistor values I was looking for are R7716 and also R7721.

Your help would be very appreciated, thank you, Rick

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They are both 1.8 ohm 1watt fusible resistors. Metal film 5% 1.8 ohm 1watt will substitue them

Posted on Aug 08, 2008

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Looking for resistor value on Toshiba PB7243 Power convergence PCB Resistor is R7731 part of bias for convergence IC I think.. but looks burnt


R7711, R7721,
R7116, R7726, R7736, and R7731. are MF, 1.2 ohm, 2W resistors--MF means metal film or metal oxide--check all of them if you are replacing the two STK-392-110 CHIPS---

They are protect resistors in case some part of either chip shorts--if even one is bad--you need to replace both chips at the same time and adjust.

If you need help or advice let me know--I am here to help.

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

SD TECH

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Jan 02, 2010 | Toshiba 55H70 55" Rear Projection...

2 Answers

Color convergence


find the change value capacitors and resistors in the convergence section!

Oct 08, 2007 | Toshiba TP50G60 50" Rear Projection...

3 Answers

PT53wx53g. green & blue convergence don't respond


You may need to check the two small resistors on the front of the baord as well. They are the power connections to you Convergence IC's, I have seen these charred and open. Just check them with a DVM or an Ohm meter to see what value they read. If they are close to 2 Ohms they most likely will be OK. But the other blue resistors will need to be replaced if they do not measure around 2.2 Ohms.

Please rate both solutions, as we are here to help you with the most information that you can get.

I hope this information allows you to resolve this issue.
If you need further assistance please comment to this post and I will try to help you further.

Thanks for using FixYa
asnowman

Nov 04, 2009 | Televison & Video

2 Answers

JVC AV56wp74 convergence. Resistor before ICs?


It's recommended to replace all the defective parts first because if you only replace the defective resistor, it might burnt again if the convergence IC is shorted internally. I would also suggest to measure the other low value resistors with multimeter.

Oct 30, 2009 | JVC AV-56WP74 56" Rear Projection...

1 Answer

I have mitsubishi model#WS55315 55 inch. get double exposure with red and green colors


Your symptom sounds like a damaged convergence IC.

There are two and large IC’s that control the convergence in a big screen set. Some of the newer sets (I think that this appies to yours)only have one. They are secured to a very large aluminum heat sink. They will have a part number stamped on them that will start with an STKXXX-XXX, like STK392-110, and they are located on the signal board (on the left as you look into the back of the set).

Along with the convergence IC’s there will also be some associated components that will need to be replaced as well. There are some resistors that are part of the convergence circuit that will be open and need to be replaced. Most likely these will appear charred in the center. If you have an Ohm Meter or a DVM, check all the resistors that are close to the IC’s and you should be looking for either ones that have opened or have changed values.
There are also two resistors on the front of the board located in the middle that are fusible link resistors, these should be checked for opens and replaced if they are found so.

If one of the convergence IC’s are found to be bad, I would replace them both, if one has gone bad the other may go soon. I usually order my parts from Andrews Electronics in California, they will have the OEM components that you will need.
Their site is http://www.andrewselectronics.com/welcome.aspx
And their phone number is a 24-Hour Order Desk: (800) 274-4666
I recommend the phone order so you can talk to the person about the different types of IC’s that are available.

I would also advise that the convergence IC’s be OEM or better, just because they are cheap does not mean that they are a good deal. I have seen the cheap IC’s fail after a short time, even though they look exactly like the OEM IC’s. I think that the bottom line is that you will get what you pay for when it comes to the parts.

You can also try http://www.tvrepairkits.com/ , I have not tried them yet, but they do carry OEM or better parts.

I hope this information allows you to resolve this issue.
If you need further assistance please comment to this post and I will try to help you further.
asnowman

Oct 09, 2009 | Mitsubishi WS-55315 55" Rear Projection...

1 Answer

My Mitsubishi vs-50111 has green, red arced line at top and bottom with double vision like suddenly. Any ideas?


Your symptom sounds like a damaged convergence IC.

There are two and large IC’s that control the convergence in a big screen set. Some of the newer sets only have one. They are secured to a very large aluminum heat sink. They will have a part number stamped on them that will start with an STKXXX-XXX, like STK392-110, and they are located on the signal board (on the left as you look into the back of the set).

Along with the convergence IC’s there will also be some associated components that will need to be replaced as well. There are some resistors that are part of the convergence circuit that will be open and need to be replaced. Most likely these will appear charred in the center. If you have an Ohm Meter or a DVM, check all the resistors that are close to the IC’s and you should be looking for either ones that have opened or have changed values.
There are also two resistors on the front of the board located in the middle that are fusible link resistors, these should be checked for opens and replaced if they are found so.

If one of the convergence IC’s are found to be bad, I would replace them both, if one has gone bad the other may go soon. I usually order my parts from Andrews Electronics in California, they will have the OEM components that you will need.
Their site is http://www.andrewselectronics.com/welcome.aspx
And their phone number is a 24-Hour Order Desk: (800) 274-4666
I recommend the phone order so you can talk to the person about the different types of IC’s that are available.

I would also advise that the convergence IC’s be OEM or better, just because they are cheap does not mean that they are a good deal. I have seen the cheap IC’s fail after a short time, even though they look exactly like the OEM IC’s. I think that the bottom line is that you will get what you pay for when it comes to the parts.

You can also try http://www.tvrepairkits.com/ , I have not tried them yet, but they do carry OEM or better parts.

I hope this information allows you to resolve this issue.
If you need further assistance please comment to this post and I will try to help you further.
asnowman

Oct 07, 2009 | Mitsubishi VS-50111 50" Rear Projection...

2 Answers

Panasonic 1080i


Try adjusting the convergence. If it won't move see below- (or hitting Magic Focus for some Hitachi’s)

This sounds like convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually charge between $200-$400 Be sure to vote/rate me if this helped Thanks!

http://www.ehow.com/how_4575598_yourself-projection-tv-repair-convergence.html

Oct 05, 2009 | Panasonic PT-53WX53 53" Rear Projection...

3 Answers

Blue and yellow shadows on my Hitachi rear projection TV


The color has gone crazy on you because your convergence IC's have gone bad.
These IC's operate at a very high temp, and usually only last 4-5 years. 
If you remove the back of the set, you will want to look for the BIGGEST heatsink in there, on that heatsink, you will see 2 lage IC's , probably STK392-110, or STK392-120's or something close...regardless - you can go on ebay to order the new ones, but MAKE SURE they are Genuine SANYO IC's and not counterfiet cheapies. the cheap ones may only last 2 months..
You will also need some "Heat transfer paste" - you can pick this up at radio shack.
Once you remove the old IC's, test all the large resistors near them.. pull one side of the resistor out of the board so you can check it out of circuit. they will usually have the value in Ohms, printed directly on the resistor, but you may have to use the resistor color code to find out what value they are....However, usually if there is any damage, the resistor will look like it has been HOT or fried. replace the IC's and any bad resistors, and you should be good to go.
If after replacing the IC's and any defective resistors, the convergence is still bad, make sure to use a multimeter to check ALL fuses on the boards, --- sometimes when the IC's go, they will take out a fuse to the convergence power supply. If you find any bad fuses, replace them accordingly!
Hope that helps!

Dec 21, 2008 | Toshiba 55H70 55" Rear Projection...

1 Answer

Toshiba 42h82 convergence resistor and pico locations


(6) 1.8 ohm 1watt metal film resistors for R7711, R7716, R7721, R7726, R7731 and R7736 yes the STK 392-150 will work fine.

Sep 24, 2008 | Toshiba 57H82 57" Rear Projection...

1 Answer

Hitachi 53UWX10B 53 convergence color lines dont move w\RC


After replacing IC's, double check the solder connections for bridging or no solder on pin(s). Check all bias resistors (low ohmage). Make sure you have your VCC voltage, should have a positive/negitive voltage of about 24 v on each IC and +38v.Also, make sure all cables are plugged in and fully seated

Note: All bias resistors are very low ohms eg; 3.3, 1.8, 2.2 make sure correct value, very important.
If can't adjust still CPU digital convergence board (near ic's) shielded may be defective.

Feb 23, 2008 | Hitachi 53UWX10B 53" Rear Projection...

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