Question about Hitachi 43UWX10B 43" Rear Projection Television

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Thermal grease I replaced the resistors and ICs, but there is thremal grease on some of the leads on the ICs. Is this OK? or do I need to pick it out?

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  • AveoRob Nov 14, 2008

    I thought thermal grease or compound did not conduct electricity.



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If the grease is connecting 2 leads at the same time, then this is not ok.

Posted on Nov 14, 2008


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I have a green line converge issue i can't get it to line up, i get it close then th red line moves out of wack. The right side of the picture starts to look 3D. What can I do

Convergence issue, if you cannot fix it by convergence adjustment, is un-doubtedly due to malfunctioning STK amplifier ICs. There are two of them that need to be replaced . They are located behind large aluminium heatsinks as shown in the image below.
The ICs can be purchased on ebay by using the IC numbers in your set as search keyword. You will have de-solder the old ones, apply silicon based thermal grease to the replacements and solder them into the board. Note that you have to make sure that they are making good contact with the heatsink when you replace them. You will also need to test and replace any resistors that the ICs may have taken out when they have gone bad. I hope you know how to use a multimeter(or ohm-meter) and can read resistor color codes. color code chart/Live4soccer7/360fullres/resistor_color_code_chart.jpg
If there is any thing else you would like to know, please let me know.
PS: Bad rating = No further help

Sep 16, 2011 | JVC AV-56WP74 56" Rear Projection...

3 Answers

60"marantz /philips rear ICs not working.

try to stick to original part number if possible Pioneer uses this on the PRO-530 / PRO730 models . MCMELECTRONICS has the originals as STK392180 .Also you might want to check capacitors near those ICS for leakage .When these go out they will affect amplification from IC given you not enough adj room .

Dec 07, 2007 | Televison & Video

3 Answers

I have an rca r52wh77 it is bowed in the top and bottom. it also is way off in convergence and i can not seem to get the crosshatches to come together. i have changed the fl123 part that was sent in my kit...

Does the kit have a pair of convergence ICs? That is what you will need to fix the convergence problem. The kit should also contain thermal grease(a white paste that should be applie to the ICs before you solder them) and resistors that may also need to be replaced. When a convergence IC blows its usually due to failed resistors.

May 26, 2011 | Televison & Video

1 Answer

My Blue convergence circuit went out. What parts need to be replaced? What is a ball park price for parts and approx. labor time? Thanks. Jack

STK393-110 is the IC that in your set. You are going to need two of them and thermal grease that has to be applied to the ICs before soldering them to the board.Should cost you about 15$ per pair
click here to buy
You are also gonna need a multimeter to test the resistors in the circuit and replace them if they read abnormal resistors. You will also need to know how to solder . Type of solder is lead free 1mm. I would say this is a rather complicated fix for someone without prior experience if you have never worked on electronic circuits before. The circuits also hold residual voltages for several days after the set is un-plugged. If you would still like to do if yourself, then let me know and I will give you more detailed instructions.

Dec 05, 2010 | Mitsubishi WS-65711 65" Rear Projection...

1 Answer


Panasonics will usually need the 2.2 ohm 2watt resistors replaced with the ICs , as usually at least one will blow possibly two when the ICs fail. If you didnt replace the resistors you will also most likely need to replace the ICs again as a bad resistor will ruin new ICs usually

Jan 05, 2010 | Televison & Video

1 Answer

Panasonic (PT-56HX41PF) rear-projection tv with no picture

The three blinks indicates a convergence IC fault. The convergence ICs must be replaced with the manufacturer replacement part. Use only the original replacement part. Your set uses STK392-110 convergence ICs.
These ICs are mounted on a large heat sink. Yes, you can replace it yourself and save few hundred bucks. But you must be knowledgeable enough on how to solder, resolder and use a multimeter.
You will need:
  1. Convergence ICs
  2. Heat sink grease or thermal compound
  3. Soldering iron
  4. Solder lead.
  5. Digital multimeter
  6. Solder pump
  7. Small side cutter
Feel free to inform me if you decide to replace the ICs yourself

Dec 03, 2009 | Panasonic PT-56HX41 56" Rear Projection...

1 Answer

How to replace convergence ICs in samsung

You will need:
  1. Convergence ICs.
  2. Heat sink grease or thermal compound.
  3. Soldering iron.
  4. Solder lead.
  5. Digital multimeter.
  6. Solder pump.
  7. Small side cutter.
  1. Unplug the unit from the AC outlet.
  2. Remove the screws and take the back panel off the TV. The convergence ICs are located behind a large heat sink.
  3. Remove the board that the ICs are on.
  4. Check all the big resistors on the board using the digital multimeter. Some resistors are connected in parallel so they read half of their nominal resistance.
  5. Check the board for cracked solders and tracks.
  6. Cut all the legs of the ICs and unscrew them from the heat sink to take them out.
  7. Remove all the legs by applying soldering iron on one side and pulling on the other side.
  8. Clean the holes for the new ICs with the soldering iron and solder pump.
  9. Clean the heat sink from the old thermal compound or grease and apply the new one to the ICs.
  10. Fit the new ICs legs on the holes and screw them to the heat sink. Wipe excessive grease. Make sure they are making good contact with the heat sink.
  11. Cut excessive length of legs. Leave about 2mm and solder it in.
  12. Clean solder points with lacquer thinner or even alcohol.
  13. Make sure no solder is going to two legs at the same time.
  14. Put all back together.
  15. You may need to readjust the convergence on the menu.

Oct 24, 2009 | Samsung HCN653W 65" Rear Projection...

1 Answer

TN50X81 - one convergence IC runs hot...TV powers off after 5min

What was the STKs that was in set ? If 110s always upgrade to STK392-180s. If they were 392-560s go back with the same. they worked differently then the 110s 150s 180s

Nov 27, 2008 | Toshiba TN50X81 50" Rear Projection...

1 Answer

Philips 46pp9302 blue convergence not adjusting

Look in the back for large black ICs that are attached to a heat sink. They will be marked STKxxx. First try resoldering the pins on these ICs. If that failes to resolve the problem, replace the ICs. If you can post the exact markings here, I'll detail the possible fuses or resistors that should be checked as well.


Jul 29, 2008 | Philips 46PP9302 46" Rear Projection...

1 Answer

Colors all over

did you check to make sure none of the IC pins are bridged with solder? Also did you check the resistors that power the ICs in this model usually 1 or 2 of those resistors will go open with the ICs.

Mar 20, 2008 | Panasonic PT-47WX53 47" Rear Projection...

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