Question about NEC PlasmaSync 42MP3 42 in. Television
My nec tv has been turning off 5 seconds after turning it on and the power indicator button is blinking green please help
ive only been using tv for two weeks
Hi - first check that all the fans are rotating - the set will shut down if they are not.
***** WARNING potentially FATAL voltages (up to 400V DC) exist on the PSU boards - if you don't know exactly what you are doing don't ! *******
Unfortunatly the fault could be on a) PSU b) CPU board, as this monitors the PSU voltages and will shut down the set if the measured voltages are wrong c) plasma drive circuits - if these are drawing excessive current, or someother fault exists the fault feedback signal to the CPU board will activate and the set will again shut off.
Check the PSU voltages, the standby power must be OK otherwise the set wouldn't work at all !. The +5V switches on first followed by the +70V and +170V (about 1-2 secs delay.)
If the 70 and 170 dont come up try removing (with the power DISCONNECTED) the two large double row connectors on the PSU board near the 70/170 V test points - these supply the plasma drive circuits - the set will still switch off as there is a fault feedback line from the drivers, but it should stay on long enough to check the voltages.
Posted on Mar 03, 2008
Tips for a great answer:
Oct 30, 2016 | Sharp Flat Panel Televisions
The front panel Status LED provides an indication of
the set's operation and the possible cause of a malfunction.
If an abnormal condition is indicated, perform the
Self Diagnostics procedure.
To activate, press the front panel <ACTIVITY> &<CH
??> buttons at the same time and hold for 5 seconds.
The STATUS LED will then flash denoting a two digit
• The number of flashes indicates the value of the
MSD (tens digit) of the Error Code.
• The flashing then pauses for approximately 1/2
• The LED then flashes indicating the value of the
(ones digit) of the Error Code.
• The Error Code is repeated a total of 5 times.
Example: If the Error Code is "23", the LED
will flash two times, pause, and then flash three
Table 2-2: LED Indications
Error Codes, descriiptions and the most likely cause of
the error are listed in Table 2-3.
Note: The TV must be in "Shut Down." The LED
will probably be indicating an abnormal
condition. If the TV is switched Off, AC is
removed, or a System Reset is performed, the
code automatically resets to "12" No Error.
See the Error Code Log to retrieve a history of
Note: Use the front panel buttons, not the remote
Note: If there is no response, the front panel may be
locked by a V-Chip setting. To unlock, press
and hold <ACTIVITY> on the front panel for
LED Indication Condition
Off Off (standby)
Green Power On
Slow Blink Green Power Off with Timer Set
Fast Blink Green (80 seconds) > Off Power Off (Cooling fan still working, 80 sec)
LED Indication Condition
Red Lamp Failure
Yellow TV Too Hot
Slow Blink Red TV May Require Service
Slow Blink Yellow Lamp Door Open or No Lamp Installed
ABNORMAL INDICATIONS (For details perform Self Diagnostics Procedure.)
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Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
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