Question about Philips Magnavox 51MP392H Rear Projection Television

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Removing circuit board

How exactly did you remove the circuit board so you could replace the chips? Did you unplug EVERYTHING and take out the entire board, or just a section of the board? I'm just wondering as there appears to be a lot more than 10 plugs that I have to disconnect to get the entire board out (the one that covers the entire bottom of the set). Just to clarify, I need to replace the chips in my Magnavox 51MP392H/17.

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You can get Factory Service manuals from www.magnavoxhelp.com
Their manuals cover all projection TV models with Chasis # PTV835, PTV836, PTV840, PTV841, PTV842,PTV843, PTV844, PTV847,PTV853

Posted on Jun 24, 2008

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How do i remove convergence chips unit on jvc av-48wp74


I have some good advice for you---done this on this model several times and I will attach a few photos as well..

The convergence board is at front of set---remove 2 screws on back on either side---two more tiny ones on front where control door is and lift and remove entire grill below screen off.

There is a inspection plate dead center behind where the grill was--remove it also.

Behind it is the convergence board. It helps to take rear cover off also.

there are about six plugs to remove---three are identical for the convergence yokes----make sure you mark them so they go back in the exact same place as removed.

There should be another plug going to (seen from front) left to the power supply board and another small plug to the front left.

The last plug is hard wired into the convergence board and goes back and up to another board where it can (from rear of set) be unplugged.

Board is held in place by plastic tabs at front of set into the black plastic frame--lift it carefully up in case is also screwed in(not usual).

You now can lift the board up and out the front of the set.


If you look at the resistors---in front of the chips I would test all the small ones there and look for any that are discolored--if memory serves me they are 1.8 ohm and 1/2 watt----only the 1/2 watt resistors will fail and usually the set will not come on if this is the case---power light constantly blinks will be the issue.

Let me know if you have not replaced the chips ever and I will give you some pointers etc.

SD TECH

10_30_2012_5_30_17_pm.jpg10_30_2012_5_30_48_pm.jpg

Oct 30, 2012 | JVC Projection Televisions

1 Answer

Um yes I have a HITACHI 43UWX10B and everything on it is fairly new. It does everything it shld it turns on just fine it has my settings...everything, but the screen is the problem I turn it on and it...


If picture is 3d the convergence chips (2) need to be replaced.

With back off (set unplugged) as you look from back on far right side is large metal heat sink with fins; the chips are on far right side of that---either STK-392-110 or the odd version uses -120 chips.

8 out of ten times just the two chips need to be replaced and set adjusted with the remote.

One version of this set has the chips on a REMOVABLE circuit board (6 wide and about 15 deep) and this is the easy version, the other requires entire chassis be pulled back and tilted up so bottom of board faces back of set.

Soldering is involved here and there are a few other things to look at but the chips on EBAY are less than 12 dollars for a pair.

Determine which version you have and before you rate this information let me know your skill level and if you have any questions.

sd tech

Jul 19, 2011 | Hitachi 43UWX10B 43" Rear Projection...

1 Answer

No sound


This is a model that had a lot of problems with the audio.

I worked on a lot of them when they were first made and sold.

What happened was some idiot had the bright idea of placing the entire audio circuit on a single small circuit board mounted on the left inside wall of the set (as you look from the back).

All sound from all inputs and the tuners goes into and out of this board and they mounted the audio output IC chip directly over a number of large surface mounted chips---heat from the chip damages solder connections all over the area around it.

Hitachi did have a service bulletin about this which basically said resolder everything---hundreds of fine connections---surface mounted means most of the fifteen or more chips are mounted on the top or bottom and are soldered to the board---not through the board as is usually the case.

I have seen technicians try to repair them and spend hours and not have success. The board is no longer available from Hitachi and the only way to get it fixed now is to remove it and send it to a national company called PTS Electronics who repairs and rebuilds all kinds of circuit boards.

The last one of these sets I saw was in the shop I work for and we did not fool around as it was under extended warranty---turnaround for the board (you have to remove the one in your set and send it to them) was about 7-10 days and cost was about 150 dollars but you can find their address on the net and ask for a quote---Part number for the Surround Audio board is:

X480233


Let me know if you have questions or need advice.

PS: I have seen two people who got around this problem by getting a surround sound system fed directly for audio from their cable box, this may be a much less expensive way to settle this issue.

SD TECH

May 04, 2010 | Hitachi 61UWX10B 61" Rear Projection...

1 Answer

Red light green light on off all time tv will not turn on


ok if you have just replaced the bulb, first try taking out the bulb unit and putting it back in, if you have already tried this, then disconnect everything from the TV unplug it find a nice sturdy place where you can place the tv, at the back of the tv remove the lower back panel ONLY, the screws you need to remove will have an arrow pointing to them, once removed clean all built up dust, remove cooling fan and clean from dust , check it spins ok, remove silver plate in the middle and remove any built up dust, just to the right of the fan there is a sensor unsrew and remove check it is free from dust, on the left of the fan is a micro switch unplug but do not pull on wires to the far right you will see a retainer bar upright (silver) remove this, gentley pull all the circuit board assembly back it will not come out far, on the back circuit board unplug the top two plugs top left but DO NOT pull on wires pull the circuitry board forward just a fraction more, and behind it is yet another multi plug, pull out the one to the left and plug back in but clear any dust in mean time, gently put everything back and plug all that you have unpluged back in gently, put all bars and covers back on, and re-install equip to tv........ this is what i did to mine when i had this probem today after bulb replacement and it now works fine

Mar 16, 2010 | Sony KDF-E50A12U 50" LCD HDTV

1 Answer

Philips 60 convergence problem


When you take off the back of the TV, you should see a fairly large circuit board with two black chips that are standing vertical. They should each say STK392-XXX (where the X's are typically 100, 110, etc.). The "convergence chips," as they are called, can cost you anywhere from 15-30 dollars depending on where you buy them. You can either go to a TV repair shop and have them order the parts for you, which means there would be a middle man, or you could find some online. www.tvrepairkits.com has a number of kits available to make the job easier. You just plug in the brand, type, and model number of the TV and you can look at the various kits they offer. Last time I checked it was roughly $70.00 for two chips, soldering guide, online support, and some other stuff.

Another option would be to simply type the chips code (STK3392-XXX) into a search engine (google, yahoo, etc.) and then see if you can buy the chips alone. This would msot definitley be a cheaper option.

Once you have ordered the convergence chips, you are going to have to remove the circuit board/wires and anything attached to the circuit board. Once you have the circuit board out, you are going to need to flip the circuit board over and remove the solder using a soldering gun and some "wick" that will soak up the solder. You will have to do this for both chips, flip the circuit board over, remove the clamps, then remove the chips. Next, I would insert the chip, clamp it in, flip the circuit board back over and begin soldering the pins individually. Do this for both chips.

Chances are, you are also going to have to repalce some resistors as well. To do this you will need a multimeter that measures ohms and a chart telling you how to read resistors. One can be found on www.elexp.com under the hints/tips section.

All in all, it should only take about an hour with fairly good soldering skills. So you will need a screwdriver with a "star" shaped head, possibly a philips head screw driver, and a steady set of hands to remove the circuit board. Then you will need some desoldering wick, a soldering iron (I would use a 15 watt iron), some small-diameter flux-core solder (rosin), and some patience. There a PLENTY of youtube videos that go through the repair step-by-step.

It's not as bad as it may seem after reading this article. Soldering is not difficult, however, when working with circuity it can be somewhat easy to screw something up. That being said...a little confidence and a lot of patience should get you through it. Good Luck!!!

REMEMBER: UNPLUG THE TV and BE CAREFUL!!!! A TV HAS LOTS OF VOLTAGE STORED IN VARIOUS CAPACITORS AND OTHER DEVICES!!!

Feb 27, 2010 | Philips 60PP9202 60" Rear Projection...

1 Answer

I purchased the convergence chips for Samsung PCL5415RX/XAA TV. Do I need to remove the entire sub deflection board to R&R them?


Yes, however I would be surprised if changing the two Ics will repair the set, as that chassis should always have the sub-deflection board replaced since most of the resistors will be stressed. Thats why samsung changed the later chassis's by removing the convergence circuits from the deflection board as its almost 98% certain that the deflection board will need replacement when the ICs fail with those chassis designs unless every component in the convergence circuit is replaced which will cost more than the deflection boards do. But you may get lucky but if the ICs dont cure the problem you will need a new deflection board

Dec 23, 2009 | Projection Televisions

1 Answer

How do you replace ic chips on Panasonic 52 inch hdtv projection?


Most IC's on circuit boards these days are of the surface mount variety. You will need special Desoldering Equipment to remove these chips, especially the one wth 100 or more pins, the type of equipment used in this process heats all sides of the chip at once while a small suction that grabs the chip for removal. Now the SIP chips (Single inline package). chips which usually consists of less then 20pins can be removed with a desoldering gun such as the HAko 880 desoldering gun. Or you can use a standard soldering iron and solder Wick, that can be found at Radio Shack under Soldering Braide).. These procedures are common for all IC replacement. I am asuming you are trying to remove the Convergence IC on this model, The two large Black one labeled STK-392-110, the correct and easy way to remove these is to remove the entire board from the unit and remove the two screws holdinf each one in place, Unsolder the pins of each one and remove the IC, reverse this process to reinstall them. Good soldering technique is critical here as you don't want to bridge pins together causing yourself more problems. Double check your soldering and Double check it again.

Thanks :
Delhielectronics@live.com

Sep 28, 2009 | Panasonic PT-53WX53 53" Rear Projection...

1 Answer

Replacing convergence chips


Take a few pictures of the convergence board. You are better off removing the board to make removing the IC's and replacing them much easier since you need to solder them. Here is a link to a page where the procedure is display step by step with pictures. Best of luck.
Greg

http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Jun 06, 2009 | Projection Televisions

1 Answer

JVC big screen t.v.


Not that bad to remove

As long as it is unpluged you won't get shocked

Look to the right of the boards Remove all the little screws from the convergence board
Make sure you mark or notate where the correctors go

Flip up the little connectors to the left of the board
Do not force the board up if you have to force it you missed a screw

use solder wick and remove the parts

make sure there are no shorts and you replace all the resistors in the kit

Good luck




Feb 09, 2009 | Hitachi FDX Series 43FDX10B 43" Rear...

1 Answer

I attempted a repair on my pt-53tw53 by replacing the 110 ic chip ( the one on the diagonal heat sink) but, I think I did a bad job of soldering. When I tested the set when turning the power on the set...


You can repair any of the traces with small wires from the affected pin to the next componnent on that trace. To remove the board label all wires that you disconnect. There are "bridge" connectors that connect the signal bd and main bd. these lift up off the main board and will stay attached to the board youre working on. If you need further info please let me know. Also use solder wick to remove the solder and get a small tip solder iron 30watt from radio shack. The proper way to solder is (1) allow the iron to heat up. (2) touch the hot tip to the pin on one side and then briefly touch the solder to the other side of that pin so the solder flows around the pin. Use the solder sparingly so you dont bridge the pins with solder. (3) always check your work with a magnifying glass to insure the pins arent bridged.

Apr 09, 2008 | Panasonic PT-53TW53 53" Rear Projection...

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