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 Televison & Video

1 Answer

How to change the power supply in a KDL-37XBR6


The repair / replacement procedure is not extremely difficult if you have some basic electrical safety knowledge and some basic electronics / mechanical repair skills.

You will need to unplug the power cord from the unit, lay the TV screen side down on something soft and flat like a bed if necessary, and then remove the rear access panel or the entire rear cover as required in order to access the circuit boards inside.

When you remove the rear cover and access the circuit boards inside, just check the part number that is printed right on your circuit board and confirm that it exactly matches the one provided in the online listing or the replacement part you have. Also make sure that any part you order is labelled "TESTED WORKING" in the condition description. Any part with a condition description of "AS IS" is probably faulty itself as well.

Then unclip and remove the various electrical wire connectors leading to the power supply circuit board. Then remove the screws securing the circuit board to the TV frame and then remove the power supply circuit board. Be sure to avoid touching any large capacitors on the circuit board which can retain a nasty charge even after the unit is unplugged.

Then just screw in the new circuit board and connect all the wire bundles to their appropriate connectors on the new circuit board and then replace the rear cover. Then plug in the power cord and test.

I can't tell from the manual if this particular model has the smaller removable access panel on the back or not. If it does, you will see a few screws around a removeable center section of the rear plastic enclosure. Just remove these screws and the smaller plastic panel should unhook and come off allowing you to access the main circuit boards inside.

Otherwise you will have to remove the entire rear plastic enclosure. This is not exceptionally difficult, it just means you will have to remove many more screws. There will likely be over a dozen small philips head screws all around the perimeter of the rear enclosure holding it to the TV frame. Depending on your setup it may be easier to lay the screen side down on a soft flat surface like a bed to do this, but most times this is not necessary. Just be sure not to press too much on the LCD display panel itself or allow it to get scratched / gouged / bent / poked / etc.

Here is a link to a picture of what a generic LCD TV looks like with the rear panel removed revealing the major circuit boards inside:

http://techon.nikkeibp.co.jp/english/NEWS_EN/20090608/171435/?SS=imgview_e&FD=50422440&ad_q


And here is a link to an interesting Youtube video which shows an LCD TV being disassembled for spare parts harvesting:

http://www.youtube.com/watch?v=uCNEEuVhAWk&feature=related


Although unlike the video shows, you might want to use a manual hand screwdriver to remove the rear enclosure screws if you do this yourself for the first time.

Here also is a link to the SHOPJIMMY.COM parts supplier website which has all the available replacement parts (circuit boards) for your model of TV:

http://www.shopjimmy.com/sony-kdl-37xbr6


Just click on the appropriate part number under the POWER SUPPLY section to show a picture of the board as well as details and price. Unfortunately all those different power supply circuit boards appear to be currently OUT OF STOCK there, but you can probably find the one you need elsewhere online or on Ebay by searching for the exact part number listed on your particular circuit board.

Please comment back here to this page if you have any details to add, have any questions, have difficulty accessing the links, or just require further general assistance and I will respond as soon as I see it.

I hope that was helpful to you, good luck and take care.

Joe.

Sep 12, 2011 | Sony KDL-37XBR6 37 in. LCD HDTV

1 Answer

We have a hitachi l32h01au tv and the inverter is broken in it. is it difficult to replace and how much can i get an inverter for?


Here is a link to a full list of the circuit boards available for your set from SHOPJIMMY.COM:

http://www.shopjimmy.com/hitachi-l32h01u



And here is a direct link to an INVERTER BOARD currently available there for about $39 US:

http://www.shopjimmy.com/samsung-ssi320wa16-backlight-inverter.htm


You may also find replacement circuit boards on Ebay if you search for your TV's model number or for the exact part number printed on the inverter board itself. Prices may vary slightly on Ebay, but SHOPJIMMY is a very reliable sources of spare parts with consistently fair market prices.

The board replacement procedure is not extremely difficult if you are handy with a screwdriver, have some basic electrical safety knowledge, and a bit of electronics / mechanical repair skills.

You will first need to unplug the power cord from the unit, lay the TV screen side down on something soft and flat like a bed, and then remove the rear access panel or the entire rear cover as required in order to access the circuit boards inside. This will require removing 12 or more philips head screws from the rear panel plastic enclosure.

When you remove the rear cover and access the circuit boards inside, just check the part number that is printed right on your circuit boards and confirm that they exactly match the ones provided in the replacement board listing. If you order the part from Ebay, also make sure that any part you are considering is labelled "TESTED WORKING" in the condition description. Any part with a condition description of "AS IS" is probably faulty.

Then unclip and remove the various electrical wire connectors leading to the inverter boards Then remove the screws securing the circuit board to the TV frame and then remove the board. Be sure to avoid touching any large capacitors on the power supply circuit board while you are in there. They can retain a nasty charge even after the unit is unplugged.

Then just screw in the new circuit board and reconnect all the wire bundles to their appropriate connectors on the new circuit board and then replace the rear cover. Then plug in the power cord and test.
Good luck.

Joe.

Aug 28, 2011 | Hitachi Televison & Video

1 Answer

No picture but does still have sound


Most often, this symptom is a result of a failing POWER SUPPLY, but a bad / overheating LCD CONTROLLER BOARD, or a faulty INVERTER BOARD can certainly cause very similar symptoms. Unfortunately, without a donor TV or a dedicated test rig, it can be very difficult to differentiate between these problems.

One way to test this is to remove the rear access panel on the TV and replace the power supply circuit board with a new one, since this is the most often the source of the trouble.

You can usually find a replacement power supply circuit board on Ebay by searching for your TV's model number. If you comment back here to this page with the TV's exact make and model number then I can help you find suitable replacement boards as well.


The repair / replacement procedure is not extremely difficult if you have some basic electrical safety knowledge and some basic electronics / mechanical repair skills.

You will need to unplug the power cord from the unit, lay the TV screen side down on something soft and flat like a bed, and then remove the rear access panel or the entire rear cover as required in order to access the circuit boards inside.

When you remove the rear cover and access the circuit boards inside, just check the part number that is printed right on your power supply circuit board itself and confirm that it exactly matches the one provided in the Ebay listing.

Then unclip and remove the various electrical wire connectors leading to the power supply circuit board. Then remove the screws securing the circuit board to the TV frame and then remove the power supply circuit board. Be sure to avoid touching any large capacitors on the circuit board which can retain a nasty charge even after the unit is unplugged.

Then just screw in the new circuit board and connect all the wire bundles to their appropriate connectors on the new circuit board and then replace the rear cover. Then plug in the power cord and test.


If you want to replace the LCD Controller board (otherwise known as a TCON board), or the INVERTER BOARD, the process is not much different except for the connectors which are usually the flat ribbon type.


Here is a link to another Expert's solution to a similar problem which includes links to his excellent and informative set of LCD TV / MONITOR TROUBLESHOOTING GUIDES:

http://www.fixya.com/support/t10008425-when_turn_tv_picture_flicks_off


These guides will give you some idea of the various problems with LCD monitors and the associated repair procedures.

If you choose to rate BUDMRTN's troubleshooting tips by clicking on the YES THIS WAS HELPFUL icon on his solution page at the above link, then I thank you very much for your time and consideration.


Please comment back here to this page if you have any details to add, have any questions, have difficulty with the links, or just require further general assistance and I will respond as soon as I see it.

I hope that was helpful to you, good luck.

Joe.

Aug 11, 2011 | Televison & Video

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

I have a sharp aquos 37 lcd and one day I turn it on and hear a pop sound and it went dead no power


Normally this is indicative of a faulty power supply circuit inside your TV.

The easiest way to test this is to remove the rear access panel on the TV and replace the power supply circuit board with a new one.

You can find a replacement circuit board on Ebay by searching for your TV's model number.

Here is a link to one currently available for about $100 plus shipping:


http://cgi.ebay.com/DPS-178APA-Power-Board-Power-Supply-Sharp-LC-37D43U-/260814504762?pt=LH_DefaultDomain_2&hash=item3cb9c1833a

Just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information and items at the website indicated.

The repair / replacement procedure is not extremely difficult if you have some basic electrical safety knowledge and some basic electronics / mechanical repair skills.

You will need to unplug the power cord from the unit, lay the TV screen side down on something soft and flat like a bed, and then remove the rear access panel or the entire rear cover as required in order to access the circuit boards inside.

When you remove the rear cover and access the circuit boards inside, just check the part number that is printed right on your power supply circuit board itself and confirm that it exactly matches the one provided in the Ebay listing.

Then unclip and remove the various electrical wire connectors leading to the power supply circuit board. Then remove the screws securing the circuit board to the TV frame and then remove the power supply circuit board. Be sure to avoid touching any large capacitors on the circuit board which can retain a nasty charge even after the unit is unplugged.

Then just screw in the new circuit board and connect all the wire bundles to their appropriate connectors on the new circuit board and then replace the rear cover. Then plug in the power cord and test.

One other thing you can check is to see if there is a fuse fitted on your set.

Some models will have a fuse holder compartment accessible from the rear of the set right where the power cord enters the enclosure. If your set does not have one of these, then the fuse may be located directly on the power supply circuit board itself.

Try testing that fuse for continuity with a voltmeter (with the set unplugged of course). If that fuse has failed, then it will test OPEN. If you are lucky, you may then just need to buy an exact replacement fuse and then install / solder that into place to correct the problem

I hope that was helpful to you, good luck.

Joe.

Jul 17, 2011 | Sharp Aquos LC-37D43U 37 in. LCD HDTV

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 | Televison & Video

1 Answer

A white piece fell out from the spot next to the memory chip of my Nikon coolpix P4 camera, now the camera will not turn on, can you tell me what this piece is for and if my camera can be fixed, thanks


if you feel technically inclined you can open the camera carefully and take it apart to the point where you can remove the upper circuit board ( NOTE 1: make a careful note of every screw you remove since they are different size and need to be used exactly in the same order) and then the small black plastic assembly above the circuit board below, you can see the defective switch on top of the 2nd board, remove the plastic part of the switch until you see the bare 2 contacts on the circuit board, solder a small piece of wire to bridge the contacts, now very carefully reassemble the camera observing the exact order of screws used, see NOTE 1. If everything is back in order insert the battery and the camera should work now.
note: should you not be inclined to do this work and want to sell the camera as is for spare parts I am interested, drop me a note at: cocnutray at yahoo.com. A Nikon repair shop will charge between $80 to $110 FOR THIS TYPE OF REPAIR, THEY WILL ACTUALLY REPLACE THE DEFECTIVE MICRO-SWITCH. HOPE THIS HELPS :-)

Nov 27, 2009 | Nikon COOLPIX P4 Digital Camera

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 | Televison & Video

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...

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