Question about RCA PHD50400 50 in. Plasma Television

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RCA PHD50400 PLASMA

Shuts down, found short on vcc of driver board right top as looking at back nec on board lifted all vcc points no cap or ic shows short,triple layer board? looking for part numbers of boards and source to order thanks jim s

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  • JIM SAMANSKI Mar 29, 2007

    actually this is one of the brds that drive the panel, has a large white connector that connects to video brd i quess and 3 or 4 connectors which connect to ribbon cables going to the panel itself
    thanks

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Most RCA units are board replacement only. The plasma diplay itself is not made by them. Reference replacement board.

Posted on Mar 30, 2007

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If that board has three connectors going to it (10 pin, 9 pin and 41 pin) then it is the PDP Module but no luck on finding a source for it. RCA is bad about parts supply on thier TV's the past several years.

Posted on Mar 29, 2007

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TV was fine then suddenly no picture, still have sound but no picture.


if is a lcd tv the issue could be the inverter board or one of the lcd bulbs has stop or vcc which is 24 to 30volts that goes to the inverter is not found if its there check the fuse on the inverter if its a plasma the y-sustain board may be out there is a chip called the pmc (power modulator chip ) if is shorted the first sign would be a blown chip on the vcc side 180volt if thats the case the board is shorted needs to be replaced

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Hi. When I switch on my NEC 42" Plasma (PX-42VM3A), the on light changes from red to green but then nothing happens. I have box-loads of spare parts but would appreciate any assistance in pointing me in...


CHECK FUSE AT Y-SUSTAINER PCB. IF BLOWN, DO NOT REPLACE IT! LOOK AT SCAN CONVERTORS BOARDS. THEY ARE CONNECTED BETWEEN Y-SUS AND PLUGS FROM DISPLAY(LEFT SIDE WITH FACE DOWN, BACK OPEN). SCENARIO: SCANS GOT BURNED(LOOK FOR A SIGNS AT THOSE LONG BOARDS: UPPER&LOWER).FIND ANY IMPERFECTIONS: REPLACE ALL 3 BOARDS: Y-SUS, UP/LOW SCANS.LAST THING: IF FUSE IS OK, CHECK POWER SUPPLY FOR BLOATED CAPACITORS(BIGGEST BOARD IN A MIDDLE OF THE SET) SAME SERVICE POSITION.
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1 Answer

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These types of problems are allways hard to diagnose.. If you were to power on the set and preform tests, you would think that everything was fine until the moment it shuts off.

Look on the main power board and see if you cant find the thyristor (thermal switch), those are the things that when heated will cause the set to power off for safety reasons.. They are normally placed where ever a large heatsink is. That may give you a location as to the problem and you can put a meter around its 2 pins with the set off and unplugged a couple of min after failure, if its short (0 ohms) thats not the problem, if its open, it triggered the event.

Second, you can run the set for a while and check the voltages and Ve, Va, VCC, Vsetup etc and compair to the markings on the plasma PDP sticker. If you see one is falling down over time (volts will be lost as heat) then you can isolate that portion of the supply.

Third and allways the best way to go about these problems is buy a thermal gun and moniter various spots for heat.

Its just vary hard to say, resistance could be off somewhere, diodes could be overheating as well as fets and caps. Thats why a good thermal gun can point you to exactly where the problem is.

Hope this info helps, but I would suspect the problem is on the main power supply itself and not the y sus and z sus boards side boards.

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I got the caps from Mouser.com they are 69 cents each, the Mouser part number for the 220Uf is: 647-UUD1C221MCL1GS (Nichicon 220uFm 16V 6.3x7.7 mm surface mount); the 100uF is:647-UUD1E101MCL (Nichicon 100uF 25V 6.3x7.7mm), both are 105 degree C. I bought two extra spares in case I need them for the future.
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