NEC 50 mp1 half screen problem

[ahelfer]

I am hopeful that someone in this forum can help me. I have 2 plasma monitors (50 mp1) I bought a year ago that are both displaying only the bottom half of the screen with bleeding color. They both went out 2 weeks apart which makes me believe that this is a design limitation. I have called NEC without resolution, and the local repair shop is wanting 2500 dollars to repair the TV's (to replace the scan boards?).

I read in the archives that another person was advising that the problem may just be a couple of capacitors, on the scan board, that have leaked and it may be a somewhat simple repair. I am not afraid of board level repair before and am wondering if it is that simple.

Thanks in advance

[Dooney]

[bp100a]

I too am having the 1/2 screen problem. Could you please supply more information, such as what & where to fix?

I'm an EE and not afraid of soldering, but I'll need some orientation to know what to fix.

/harry

[TIGG]

Harry,

Have you had any luck fixing the problem. I too have the same half screen (top half black).

Thanks, Rob[/list]

[nhoy]

the problem of your screen just a capacitors..yes,as Doony said it is..it is located aruond the Vertical(IC) output..
_________________
joheuf

[TIGG]

nhoy,

Thanks for the reply.

I can't find the caps Dooney mentioned. There are two boards with 4 large heat sinks an 8 caps (nichicon 120uf 2 220V) next to them, one on the left and one on the right (rear view). Not sure which board is for the top half or if I'm looking at the right board.

any help to identify the board and caps on the 61MP1 woulb greatly appreciated.

Thanks,
Rob

[William]

I seem to be having this problem too. I can do the board level work, but need a helping hand in identifying the board and the caps. Any direction would be great!!!

Thanks
William

[Guest]

William I got mine fixed. I will try and walk you through the process.
I recommend having a power screw driver (not a drill driver) lots of screws, bag and tag in ziplock bags. All References are REAR VIEW of set.
1. Remove the rear cover 2. remove the perforated large shield on the main board housing (almost in center). 3. Unplug the right top fan and temp sensor plugs ( two small plugs at the top of the main board). 4. Remove screwsthat secure the main board housing, there is also four screws by the video inputs. Do not unplug the board, just gently pull it away 6 to 8 inches. 5. Remove the cover with the Top fan attached (more screws). 6. Now the scan board for the top half of the screen is exposed. The board has four large heat sinks with two large Electrolytic aluminum caps next to each heat sink. 7. The problem caps are at the very top right side of the scan board C192 Nichicon 220 uf next to the IC, the other cap is C120 100UF on the lower side of the IC next to a heat sink. I replaced them without taking the board out. C192 is the one that failed, the other one tested OK but I replaced both.
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.
Reassemble the unit in the reverse order and you are done. Note if you test it without closing everything, make sure you have the main board shield back on, otherwise the screen will bleed due to the noise from the board. good luck! mine has been working fine.. just like new.. If you have an email address I can send you a photo of the scan board.. I'll check the posting the next few days.

[veazeyg]

I need - help can you send pictures to [email protected]

[pav]

Hi there - I'm in the same place - a faulty MP1 which switches on with a backlight but gives no picture whatsoever - any chance you can send me the cap location pictures to [email protected] thanks so much!