Question about JVC HX-D7 Shelf System

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Two linear IC

There are two of these black boxes you describe on the heat sink. which one needs to be replaced? the one without the white coating touching the heat sink?

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Depends you need a digital multi meter to check. make sure the plug is out of wall socket, set multi meter to diode check, ( the symbol on the dial will be an arrow head with a line across the point). put the probes on legs 1 &3 then 1& 2 then swap the red & black probes in to opposite hands and do the check again,if any of the readings are 000 then that is the suspect tranny. take it out and test again while its out of the circiut board,if still reading 000 then thats the problem and it needs replacing. shouldnt cost more than a fiver

Posted on Jul 23, 2008

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Posted on Jan 02, 2017

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AV-56WP30 sound cuts out after about 10 minutes after turning the TV on. any ideas?


Hello
The audio output IC has some troube with it. if it overheat, the fault you describes here will coccur. Normally audio output IC will be screwed on to a metal heat sink to radiate heat away from it while working. If the screw that holds the IC to heatsink get loose, proper heat radiation won't take place, IC will overheat with time and will shut OFF by itself. Check the screw first. Resoder all the soldeer terminals of that IC, by applying a little more solder, without making any solder bridge in between the adjecent solder terminals. This process will eliminate if there is any loose soldering junctions to the terminals of that IC. If these does not help you, replace that IC with same type and number. OK.

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Convergence problem


The convergence board is bad in this set. Samsung no longer has this board in stock. You will have to take the board out and rebuild it by replacing both of the STK convergence amp IC's These IC's are soldered to the printed circuit board. They will be standing up against a metal plate, called a heat sink. They are black in color and are about 2" by 3" . They have white lettering on them that start with STK and the some numbers. You get those numbers and go to mcmelectronics.com, enter the exact number of the IC and order two of them. Before you install the new IC's you will need to apply some heat sink compound onm the back of the new IC's. This heat sink compound is avaialable thruogh radio shack. Good Luck

Aug 23, 2007 | Samsung HCL4715W 47" Rear Projection...

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I have a problem with tcl model 2027u. The vertical ic easily gets hot and will explode after several minutes. All the voltages in the vertical circuit seems to be normal. I replaced the def yoke, the...


I don't have the circuit diagram in front of me, but I would suspect a shorted or leaky capacitor in the output circuit. Another possibility is that the heat sink is inadequate or something is amiss with the thermal interface between the IC and heat sink.

Is the vertical waveform normal? Put a convergence pattern up and see if the grid is linear from top to bottom. This could give you a clue.

Mar 11, 2011 | Televison & Video

1 Answer

Changed tracking on vcr and got screen shrunk with black bands on top and bottom. Won't go away and doesn't go away when you unplug and plug back in, or when you disconnect VCR. Any suggestions?


I believe the TV may be at fault here. This aging TV has a vertical problem, The horizontal bans you describe are common on an aging Zenith TV. You need to find an electronic enthusiast to correct this. Tell them to resolder the vertical IC and replace those capacitors that are near and next to the vertical IC. And have them replace the capacitors in the power supply. They will include a 25 volt 100 MF cap and a 35 volt 22 Mf cap. These are located very near the STR 5041 regulator on a large heat sink. Have them replace the high voltage deflection cap that is about 200 volts at 1 Mf, near the flyback transformer. And on the other end of the board near two heat sinks (one of these is the vertical IC heat sink) there is a 25 volt 220 Mf cap that is dead by now. resolder any and all bad grounds. Please save this TV and give it the longevity it deserves. Thanks for asking and show a few hands of support.

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Specs for orion 12" hcca


* Sensitivity: 84 dB
* RMS Power Range : 2000 Watts
* Peak Power Handling: 4000 Watts
* Impedance: 2 Ohm
* Diameter: 12 Inch

Features

* 4" Copper Wound Voice Coil on an Aluminum Former, High temperature PAARC (Polyester Amide, Amide Resin Coated)
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* Dual Flat Conex Spiders with Loop/Stitched Tinsel Leads
* Tall, wide, balanced, Foam (high density expanded polyester foam) surround for linear controlled long excursion using a Tri-Radius symmetrical edge design optimized on non-linear FEA
* Enhanced voice coil cooling system (forced convection ? aluminum heat sinking ? shorting rings to reduce inductive heating)
* Dimensions (in) 11.9 x 10.7

Jan 04, 2011 | Orion HCCA 12D Car Speaker

1 Answer

Distorted picture triple colors warped screen


Your symptom sounds like a damaged convergence IC.

There are two and large IC’s that control the convergence in a big screen set. They are secured to a very large aluminum heat sink.

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.

You will also want to replace the white heat sink2.gif compound that is on the heat sink, just scrape it off, then clean the surface with alcohol. Then apply a thin coating of fresh heat sink compound, if you do not do this important step the new IC's will not last long as the old compound will act as an insulator to the heat transfer.

I would suggest that you contact a service center in your area for a complete diagnosis and repair, as this type of repair can get a little tricky. But if you want to repair the set yourself, just remember to be careful. The capacitors and CRT’s can hold a charge and may shock you.


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 I have helped you, please help me, and rate this suggestion the highest FixYa rating. (Two Thumbs Up)
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Sep 04, 2009 | RCA D52W20 52" Rear Projection HDTV-Ready...

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Adjust RGB guns double vision


Your symptom sounds like at least one damaged convergence IC.


You are correct you can sometimes rework the solder connections on each of these IC’s, although, if the convergence does not fix itself from time to time, you most likely do not have a bad solder connection. You will have a faulty IC. I recommend to replace them both at the same time because the chips legs can fall off due to the heat of the IC.

Please be sure to remove all of the white heat sink compound on the heat sink and apply a even coating over the back of the new IC’s. You should also bolt them down before you solder them in so that you have them at the correct height.

There are two and sometimes three very large IC’s that control the convergence in a big screen set. I believe that your set has two. They are secured to a very large aluminum heat sink. I think that the IC numbers will be IC8001, 80002.


The IC’s are large and black, you cannot miss them. They will usually have an STKXXX-XXX number on them.


There are several schools of thought on the replacement of parts and I firmly believe that you get what you pay for, so don’t buy the cheapest IC’s that you can find. One company I worked for tried this and it only caused more work for the technicians, as we had to replace them with the more expensive ones in the end. I would think that you should be able to find these for around $60.00 each. If you can find the exact Hitachi part, or Sanyo, even though the numbers on the front are the same, and they look exactly like the $10,00 ones, they are better and more reliable.

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.

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 I have helped you, please help me, and rate this suggestion the highest FixYa rating. (Two Thumbs Up)
Please Note: If you can not rate this post with the highest rating, then please do not leave any rating. I am doing this for free and I do not think that any rating other that the best is needed.
If you need further assistance please comment to this post and I will try to help you further.

Jul 16, 2009 | Hitachi 53SWX01W 53" Rear Projection...

1 Answer

Alignment is broken on hitachi hdtv


Your symptom sounds like at least one damaged convergence IC.


You are correct you can sometimes rework the solder connections on each of these IC’s, although, if the convergence does not fix itself from time to time, you most likely do not have a bad solder connection. You will have a faulty IC. I recommend to replace them both at the same time because the chips legs can fall off due to the heat of the IC.

Please be sure to remove all of the white heat sink compound on the heat sink and apply a even coating over the back of the new IC’s. You should also bolt them down before you solder them in so that you have them at the correct height.

There are two and sometimes three very large IC’s that control the convergence in a big screen set. I believe that your set has two. They are secured to a very large aluminum heat sink. I think that the IC numbers will be IC8001, 80002.


The IC’s are large and black, you cannot miss them. They will usually have an STKXXX-XXX number on them.


There are several schools of thought on the replacement of parts and I firmly believe that you get what you pay for, so don’t buy the cheapest IC’s that you can find. One company I worked for tried this and it only caused more work for the technicians, as we had to replace them with the more expensive ones in the end. I would think that you should be able to find these for around $60.00 each. If you can find the exact Hitachi part, or Sanyo, even though the numbers on the front are the same, and they look exactly like the $10,00 ones, they are better and more reliable.

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.

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 I have helped you, please help me, and rate this suggestion the highest FixYa rating. (Two Thumbs Up)
Please Note: If you can not rate this post with the highest rating, then please do not leave any rating. I am doing this for free and I do not think that any rating other that the best is needed.
If you need further assistance please comment to this post and I will try to help you further.

Jul 16, 2009 | Hitachi 51F59 51" HDTV Projection...

1 Answer

Convergence of color with Mitsubishi Model #VS-60707


Your symptoms sounds like at least one damaged convergence IC.


You are correct you can sometimes rework the solder connections on each of these IC’s, although, if the convergence does not fix itself from time to time, you most likely do not have a bad solder connection. You will have a faulty IC. I recommend to replace them both at the same time because the chips legs can fall off due to the heat of the IC.

Please be sure to remove all of the white heat sink compound on the heat sink and apply a even coating over the back of the new IC’s. You should also bolt them down before you solder them in so that you have them at the correct height.

There are two and sometimes three very large IC’s that control the convergence in a big screen set. I believe that your set has two. They are secured to a very large aluminum heat sink. I think that the IC numbers will be IC8001, 80002.


The IC’s are large and black, you cannot miss them. They will usually have an STK-XXX number on them.


There are several schools of thought on the replacement of parts and I firmly believe that you get what you pay for, so don’t buy the cheapest IC’s that you can find. One company I worked for tried this and it only caused more work for the technicians, as we had to replace them with the more expensive ones in the end. I would think that you should be able to find these for around $60.00 each. If you can find the exact Mitsubishi part, even though the numbers on the front are the same, and they look exactly like the $10,00 ones, they are better and more reliable.

I hope this information allows you to resolve this issue.
If I have helped you, please help me, and rate this suggestion the highest FixYa rating. (Two Thumbs Up)
Please Note: If you can not rate this post with the highest rating, then please do not leave any rating. I am doing this for free and I do not think that any rating other that the best is needed.
If you need further assistance please comment to this post and I will try to help you further.

Jul 03, 2009 | Televison & Video

2 Answers

Tv screen shrinks


Looks like some of the Electrolytic Capacitors in the Vertical Output stages have dried out and need to be replaced. If you are conversant with Solid State electronics servicing, then you can make an attempt. I generally do not waste time identifying the faulty capacitor, but replace the entire lot in thre Vertical stages. There are not more than 8-10 of them. Since you are changing them en masse, should not take you more than 30 - 45 mins to desolder the suspect ones, and solder the new ones. And it also saves you the bother of new problems cropping up in the near future, as all potential problems with old capacitors get removed.

Jun 20, 2007 | JVC AV-27530 27" TV

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