Question about Philips Magnavox 51MP392H Rear Projection Television

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Where is the aluminum heat sink at!!!

Where

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Its on the large signal panel. The vertical IC has 9 pins on it with the numbers TDA36540 stamped on it. your model may not have a heatsink. It could just be mounted on the circuit but look for the TDA number and you will have found the right component when you find those numbers

Posted on Jun 01, 2008

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Can you tell me where the 2 Convergence IC's and the 12, 6.8 ohm 1 watt resistors are located in the Magnovox 51MP329H TV


When you remove the rear cover you will see the large green board on the left side. Note the two large aluminum heatsinks with the fins? The 2 Convergence Ics STK392-120 are attached to that heat sink the 12 6.8 ohm resistors are at board location 3149-3160 they are all the 6.8 ohm 1watt metal film resistor located near the Heat sink which has the two ICs.

Aug 25, 2011 | Philips Magnavox 51MP392H Rear Projection...

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When you try to turn the tv on, all you get is a blinking red light, if you unplug for awhile, sometime it will come on.


Symptom: tv turns on, tv clicks once, red light comes on. Then, tv either works for a while, followed by a click, no video, normal sound and flashing red light; or, tv immediately clicks, no video, no sound, red light flashes. If that is the problem, you need to replace the convergence ICs. I had to do this twice. The two convergence ICs are mounted on palm-sized aluminum heat sinks. The heat sinks are soldered to the main circuit board. There are 4 pins soldered to the board for each heat sink, and 18 pins soldered to the board for each IC. Some of the heat sink pins are a bit difficult to desolder. The pins for the ICs are not difficult to desolder, but you must be careful not to overheat them. The heat sink and the IC come out as a unit, after all pins are desoldered. The IC is screwed to the heat sink. The correct replacement IC is a Sanyo STK392-110. I got mine from B&D Enterprises. They were not expensive. The new ICs need to be mounted to the heat sink with a heat transfer paste. I used Arctic Silver from my computer processor heat sink. Installation of the heat sink/IC assembly is a bit tricky, since you have to align all 18 IC pins and the 4 heat sink pins. When all the pins are visible through the holes in the circuit board, resolder everything. The TV should now work. Be sure to replace both ICs. My first repair was done by a technician, who obviously only replaced one. That repair only lasted a couple years, before the problem returned.

Mar 22, 2011 | Toshiba TZ55V61 55" Rear Projection...

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After a while the screen flickers and then shuts off and won't restart. Especially in hot weather


Thomas,
I am not sure if this is what I experienced, but it won't hurt to take a look at what I did.

I had a similar problem.
My TV started to flicker and I put a new bulb in. The new bulb did not help, even if it is good to replace after a couple thousand hours.
I found out that my heat sink, which is sitting on the CPU with the mirrors came loose and the unit overheated and shut off after flickering a while.
Try to take the lower back panel off and you see a heat sink which is sitting in the center of a aluminum sheet metal piece. Disconnect the wires which are attached to the circuit board behind the sheet metal. Then take off the screws holding the sheet metal and pull it gently off. It will take a little force, but it does not damage anything. Now you see the heat sink on the circuit board held by a latch going across the heat sink.
On the upper right corner you will find the handle to open the latch. Once you did it , you can take the heat sink off and see the main CPU (as I took the latch off, my heat sink fell off).
On my heat sink the Heat Sink Compound Paste creating the connection between the CPU and the heat sink dried out and became brittle, son there was no connection anymore and the heat couldn’t be transported out through the heat sink, which is cooled by a fan on the left.
I took the brittle Heat Sink Compound Paste off and applied a generous portion of the one that I bought at Radio Shack. I used a Silicone-Base Heat Sink Compound which ran $4.99 excl. tax.
After applying the paste put the heat sink gently in and when you do, you will feel like a suction indicating that you have a connection between the CPU and the heat sink.
Now you need to put all parts back together.

If you are not familiar with electronics and those wires or wouldn’t hurt or would be wise to mark the connectors and to make pictures before removing them. This will save you a lot of frustration.

I hope this helps you and brings your TV back to life. My TV was cutting out after 25 minutes and runs now like a charm.
Good luck.

PS: If you experience a black screen with vertical stripes (mine were white and green) then most likely the light engine needs to be replaced, I had this after 9 months and got it fixed under warranty

Jun 23, 2009 | Vivitek V37655 56" DLP TV

1 Answer

Replacing the ic's on a samsung hcm5525w. ic's are stuck


The aluminum plate is a heat sink, there should be solder joints to the board on it. Unsolder them and remove the heat sink to make it easier to remove.

Feb 16, 2009 | Samsung HCM5525W 55" Rear Projection...

1 Answer

Samsung HC-P4752W 47 in. Rear Projection bigscreen TV


You dont have to remove the aluminum heat sink. The ICs are attached with screws and then just unsolder the ICs from the circuit board and then replace the new ics into the pin hole locations after applying heat sink compound onto the back then screww the new ICs to the heat sinks then solder the pins. Very easy repair.

Jun 19, 2008 | Samsung HC-P4752W 47" Rear Projection...

1 Answer

Convergence


Okay thats the P51A chassis that should have a small PC board on the extreme right hand side with two large black ICs mounted onto a large aluminum heat sink. they should be stamped with STK392-040 on them. can you locate the board on the right? Does it have the two large heat sinks on the baord?

Jun 07, 2008 | Projection Televisions

1 Answer

57H81Toshiba Blue Line not straight


You have a bad convergence output IC in the blue vertical circuit. On the bottom side of the chassis you will see a " V " printed by the heat sink. You will need to unsolder the heat sink and the 20 pins on the IC to remove it. Replace with STK 392-180 (sanyo) if possible or STK 392-150. Looking from the rear the heat sinks are big aluminum finned rectangles. There are 2 heat sinks one marked H and one Marked V. Even though you have a horizontal line your problem is in the vertical IC. Be sure to use a liberal dose of heat sink compound.

Mar 21, 2008 | Toshiba 57H81 57" Rear Projection...

1 Answer

Akai pth 5498


Your Convergence amp ICs are bad. Heres how you fix It.
they are located on a huge heat sink inside your set. Just look for the largest aluminum heat sink inside your set. You will notice them they are large black ICs with about 16 pins on them. Just unsolder the old ones and solder in the replacements. just be sure to put some heat sink compound on the back of the new ICs where they contact the heat sink. You can get a de-soldering iron at radio shack with a rubber bulb to make the de-soldering alot easier and you will also need a low wattage soldering Iron to solder in the new ones. Just mark any wires you remove to get the convergence module out. That way you will know where the wires plug in when your finished. It will need a convergence adjustment when your finihed. Be careful not to bridge any of the pins with excess solder. Inspect the pins with a magnifying glass when your finished to make sure the solder from any adjacent pins arent touching each other.

Jan 06, 2008 | Akai PTH5498 54" Rear Projection...

1 Answer

Rca model r52wh74


You need to re-solder the circuit board that contains the STK convergence modules. They're on the center circuit board attached to an aluminum heat sink that's about 8" long and 6" tall, about dead center in the circuit board. You may be able to recreate the problem (hour glass effect) by gently moving the heat sink (which the modules are connected to). This gives the hour glass effect on the picture and the advanced convergence screen. This is an indication that the modules pins aren't solidly connected (meaning soldered) properly. Remove the circuit board and clean the old solder off & resolder the modules pins to the circuit board reconnected the board and then retest by again pushing on the heat sink. This is a caused by a minimum effort (a.k.a. minimum cost) solder job, probably done in some 3rd world sweat shop. The "factory" job was good enough for 3-4 years but the heat (and these modules do create a lot of heat) and stress created from repeated use eventually takes it's toll, weakens the pin connections and our problem occurs. take the appropriate cautions working around the high voltage of the set & use a non-conduting piece of wood to push the heat sink when we doing tests. Best of luck, hope ya fix it.

Jan 04, 2008 | RCA HD52W56 52" Rear Projection HDTV

1 Answer

Convergence intermittently bad


Are you talking about the heat sink?  The chips normally screw on to this "board" you're talking about? (silver, aluminum looking?)  I dont want to speculate here but did you use heat sink compound (also know as thermal grease)on the chips?  If so, the answer to your question for a known fix would be: you have a heat problem and all you might need to do is get some 5 dollar heat sink compound and get a quick fix.  Meaning, apply some of that stuff between the chips and the heat sink.

Oct 19, 2007 | Panasonic PT-47WX42 47" Rear Projection...

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