Question about Toshiba 61H71 61" Rear Projection Television

3 Answers

How to replace STK392-100?

I have a 61H70 and am trying to replace the two STK392-110's. After I opened the back cover, and removed the panel/board with all the video connnectors, there are several vertical boards with metal case on the bottom green PCB where the STK392-100's are. How do I remove these vertical boards with metal case?
Thanks a lot.

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  • yq01 Jul 07, 2008

    One of the boards has a plastic socket like what you described. But I cannot see any socket for the other two boards as their metal cases go all the way down to meet the bottom PCB. I will take a careful look. Thanks so much.

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Look at the very bottom of those boards they should have a plastic socket that they slide in. If they do you will notice a little plastic tab that has to be bent back for the panels to be removed from the socket.

Posted on Jul 06, 2008

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I had the same problem with trying to remove the heatsinks (they were soldered and couldn't remove the screws) so i cut the connectors as much as I could and after removing the screws pulled vertically up on the STKs and rocked them back and forth until I was able to snap all of the connector legs. Using a soldering iron bottom side and a mini pilers topside I was able to heat and pull each leg out. Now to replacement of both and see if that solves the problem.

Posted on Nov 23, 2008

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I am dealing with the same problem (Toshiba 61H71). I believe the vertical metal-cased board may be a tuner, and is firmly soldered (with many pins) to the PCB- blocking access to the screws that attach the STKs to their respective heartsinks) I am thinking the only way to remove the STKs is to remove the heatsinks as well (they are soldered on at only 4 points.

.... unless you found a better way :)

Posted on Sep 08, 2008

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1 Answer

Power tv on and then it clicks and turns off


Most of the time there are one or more 5 amp pico fuses open on the power supply. The cause of them opening is the +/- 30 volt line shorting from the convergence circuit. If you take this repair on yourself and are familiar with a ohm meter, you can check the small green pico fuses in the power supply. Remove the power from the set, take the back off. The board in the center is the power supply and convergence circuit. In the center of the you will a transformer. Just to the left of the transformer you will small green fuses that look like resisters. They are marked on the board but are sometimes hard to see. If one is open for the 30 volt line, the convergence IC's need to be replaced. They are mounted on the back of the large heat sink and the board must be removed to replace them. When you remove the board, be sure to remove all the screws not only around the edges of the board but also in the center too. There are also screws on each end of the heat sink and on the blind side center foot securing a ground wire. On each side of the board there are plug clips that must be lifted. At the front of the board there are plug connectors that need to be unplugged. Once the board is removed the IC's are easy to replace. Remove them from the heat sink, Unsolder them from the board using solderwik. The Convergence IC's should be STK392-570. If there is only one, it is a STK393-110. When replacing them, I recommend using heat sink compound on the back of the IC's where they contact the heat sink. solder in the new IC's then attach the heat sink to them.
Replace the small pico fuse or fuses, they should be rated at 5 amps. Once all the parts are replaced, remount the board making sure the heat sink holes align with the board holes. Reconnect the plug connectors, Plug clips, and reinstall all the board screws.

I hope this helps,
Skyassoc

Dec 12, 2010 | Mitsubishi WS-55809 55" Rear Projection...

1 Answer

Dear SIR Please send me the number part of Convergence Module for JVC Model AV-48WP74. THANKS FOR YOUR ASSISTANCE


I WOULD DOUBT THE BOARD IS AVAILABLE and you if you have convergence problems can have it repaired for 1/10th of what it would cost.

Only Two IC's and or one or more resistors fail on this board.

It is easy to actually get the board out of the set.

See attached photos of the board:

It uses two of the STK-392-110 chips ( A pair can be purchased on EBAY for about 12 dollars!) If one or more of the resistors are bad they are easy to locate and replace---generic part and each part on this board has a location number printed next to it.

Less than 20 dollars in parts, about 40 minutes to remove board, replace parts and put back--all you will need if it works is the JVC remote to use to adjust convergence.

If this told you something (or the photos helped you) rate this solution as, very helpful as I do this here for free.

Regards, SD TECH


view of board from back removed from set


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view of board removed from set from front



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view of back side of board--two stk-392-110 chips and in front of them the protection resistors



Aug 13, 2010 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Red convergence will not line up on my jvc 56 inch i art projection tv model # AV-56WP74. PLEASE TELL ME WHERE CAN I BUY THE KIT SO I CAN FIX IT MYSELF!!!


You need to pull the front grill cover/panel off the front of the tv. Remove screws (4) from back that hold it on, also 2 small ones behind front video input door. Then remove access panel. The ckt board closest to you is the convergence amplifier board. You should replace both amplifiers (stk392-110 or 120) and any burnt/open resistors you find near the amps.(use the same value resistors as the corresponding resistors in the blue amp ckt)

Jul 08, 2009 | JVC AV-56WP30 56" Rear Projection...

1 Answer

Tv won't come on


Mine is Toshiba 55 TZ, have it since 98', shutdown and red light blinking problem, search the ned and found out, generally a Convergence IC (stk392-110) problem. bought 2 for $15 at suburban-elect.com (ebay). replaced following direction from http://www.casiasfamily.com/repairlog/tp50h15.html

Open back cover, 9 screws and wirings (pls mark), removed(soldered) a electronic board infront of convergence ic. removed IC (stk392-110) (screwed and soldered).

Replaced everything and voila...! it is now working again..
no more shutsdown and red blinking light. Saves mo $400 for a repariman. of course just be careful with static and stuff.

Feb 29, 2008 | Toshiba 50H81 50" Rear Projection...

1 Answer

5 year old tv


Mine is Toshiba 55 TZ, have it since 98', shutdown and red light blinking problem, search the net and found out, generally a Convergence IC (stk392-110) problem. bought 2 for $15 at suburban-elect.com (ebay). replaced following direction from http://www.casiasfamily.com/repairlog/tp50h15.html

Open back cover, 9 screws and wirings (pls mark), removed(soldered) a electronic board infront of convergence ic. removed IC (stk392-110) (screwed and soldered).

Replaced everything and voila...! it is now working again..
no more shutsdown and red blinking light. Saves mo $400 for a repariman. of course just be careful with static and stuff.

I don't know how to solder, so I ask friend to do it for me. But I did the rest. Just to give you an idea that it can be done even if you don't know much about electronics. This in no way a recommendation but just stating my experience. Follow at own risk.

Feb 16, 2008 | Toshiba 50H81 50" Rear Projection...

1 Answer

Toshiba 50h81


it happens to my toshiba.. once in a while and gradually shutsdown every minute during the last 2 mos..

Mine is Toshiba 55 TZ, have it since 98', shutdown and red light blinking problem, search the net and found out, generally a Convergence IC (stk392-110) problem. bought 2 for $15 at suburban-elect.com (ebay). replaced following direction from http://www.casiasfamily.com/repairlog/tp50h15.html

Open back cover, 9 screws and wirings (pls mark), removed(soldered) a electronic board infront of convergence ic. removed IC (stk392-110) (screwed and soldered).

Replaced everything and voila...! it is now working again..
no more shutsdown and red blinking light. Saves mo $400 for a repariman. of course just be careful with static and stuff.

I don't know how to solder, so I ask friend to do it for me. But I did the rest. Just to give you an idea that it can be done even if you don't know much about electronics. This in no way a recommendation but just stating my experience. Follow at own risk.

Feb 05, 2008 | Toshiba 50H81 50" Rear Projection...

1 Answer

SD-P50A5-K convergence board replace STK392-110


Unplug chassis from front and back,remove chassis from back.Replace Ic's w/OEM or better quality only.Be sure to remove solder from all four reg. pins and clean/resolder.Replace 4amp fuse in power supply.

Sep 16, 2007 | Pioneer SD-P50A5-K 50" Rear Projection...

1 Answer

Convergence problem


This is by far the easiest TV to replace the convergence ic's - you don't even have to take the back off! Remove the front panel by removing the screws on the back edges secured to the front to the cabinet,also remove the small screw behind the front control door - the front comes off - remove access panel,there you will see the convergence board right in front - unplug the connectors to the board - pull it out and replace the ic's (2)part# STK392-110. Also check for any burnt or discolored resistors near the ic's - they may need replacing

Aug 20, 2007 | JVC AV-48WP74 48" Rear Projection...

2 Answers

Toshiba 43H70


The Toshiba 43H70 has two RGB driver chips (p/n: STK392-110) responsible for aligning the RGB colors, one of them went bad. Instead of throwing the TV away, I decided to try and replace them, and fix the TV. I did, and it works great! I ordered two STK392-110?s online from Electronix.com, it cost about $18 including shipping. Each STK392-110 is about 2? in length, and 1.5? in height, and is an 18 pin device. The tools I used were all purchased at Radio Shack, and are: a soldering iron with a stand, solder, de-soldering tool, thermal grease, and a digital camera (yes, a digital camera). First, make sure the TV is unplugged! On the back of the TV, take the back wooden cover off. You?ll see a bunch of wires going everywhere, a power PCB board (probably brown), and a green PCB system board. The two STK392-110?s are on the green PCB system board attached to two big heatsinks. You will have to remove the green PCB system board to get to the two STK392-110?s and replace them, there?s no way around it. To remove the system board, you?ll have to remove the board with all the video jacks on it, and will have to disconnect all the wires going to the system board, as well as disconnect the power board from the system board. The power board and system board lie right next to each other, and are connected by two connectors. You have to be careful with those two connectors, and I used a small screwdriver, got it between the mating connector, and gently pried it open. It?s like an old mechanical switch, but instead of one contact, there are several. While taking everything apart, this is wear the digital camera comes in, take a picture of everything you disconnect and remove, and play the pictures backward so you know how and where to put everything back together. The system board is held down by several screws that will need to be removed. Once the system board is removed, you can see the two STK392-110 driver chips, however, you will have to remove several vertical boards and heatsinks to get to them freely. The STK392-110?s are attached to two heatsinks by two screws each. The heatsinks are soldered on the system board, so you?ll have to desolder them to remove them. Once you have them removed, Now that the old STK392-110?s are freely accessible, go ahead and use a pair of wire cutters, and cut them off at the leads (the 18 pins). Now desolder the 36 pins left in the board. Use the desoldering tool to get as much solder out of each hole so you can easily put the new STK392-110?s back in. (Make sure you put them in the same way as the old ones!) Put the two STK392-110?s into the holes, put the thermal grease on the metal side of the STK392-110, then attach the heatsinks to them, line up the two mounting screws that hold the STK392-110 to the heatsink, and start soldering everything back together. Make sure you use enough thermal grease between the heatsinks and the STK392-110?s, too much is better than not enough. It will look like the 18 pins are all connected together on the PCB system board, but they are not, make sure you individually solder each of them to the PCB board, and do not let solder from one pin touch solder from the pin next to it!! Use the digital pictures you took and play them backwards so you can put your TV back together correctly. Attach your TV cable to the TV, plug it in, and use the remote to turn it on (stand back just in case you crossed some wires), it should work, and the picture should be perfect.

Aug 13, 2007 | Toshiba 43H70 43" Rear Projection...

1 Answer

Power Problem


Most often this problem is caused by convergence ic's. STK392-110. Sometimes cause is vert. i.c. Also, many times it is from bad solder connections on circuit board. In any case, short of unplugging unit to reset, there's not much you can do without help from repairman.By(1)removing rear cover,(2) unscrewing 2 screws holding chassis in and(3) undo all clips and wire ties holding wiring in place. Small board on (R) side is conv. Slide entire chassis towards you. Remove 3 screws from small conv. board.Remove and mark 5 plugs and 4 black jumper plugs to free board. Look at bottom of board for rings around solder joints at pins of main amps.(STK392-110). Resolder or replace amps and reinstall board. Reconnect 4 jumpers and 5 plugs in same order. Power up unit and hit magic focus. This is most common repair.

Mar 06, 2007 | Hitachi FDX Series 43FDX10B 43" Rear...

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