Question about RCA HDLP50W151 50" Rear Projection HDTV

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Hd50lpw175x7 Hey, It's not the power board. Replaced power board with new one still has the same symptoms. Do you think it could be the ballast? How can I check my old ballast to know for sure? Joyce

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  • RCA Master
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Ballast Verification Process
1. Short out door switch (SP001)
2. Apply AC power and wait till DM module boots
3. Press power switch and observe spark gap on ballast
4. If spark gap arcs, suspect Lamp. If color wheel starts but ballast won’t strike
lamp, go to next step.
5. Measure BP252 on AC IN CBA for +300Vdc. If missing check door switch, cable
from AC IN CBA to switch and AC IN PCB. If correct go to next step.
6. Monitor pin 2 of BT251 for Ballast ON command from Light Engine. If present
suspect Ballast. If missing suspect Light Engine. Pin 5 of BT251 starts at 3.3V
after power switch is pressed and drops to .18V when the Light Engine sends the
start command. No change on pin 5 indicates Light Engine is suspect, change
on pin 5 with no ballast start, ballast is suspect.

Note: Lamp may arc but not start. Pin 5 of BT251 is "LAMP LIT" and goes to 1.48V
when lamp is lit. If ballast strikes lamp but lamp won’t stay lit, suspect Lamp.

Posted on Jun 09, 2008

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WD- 60738 Just replaced bulb Sept 9, 2011 Unit turns on green flashing timer light, No statis Light, no lamp light. I can hear audio but bulb does not come on. After a few minutes unit shutsdown. The buld...


Hi W Bloom,


First of all, thank you for contacting Fixya.com regarding your TV problem.


My first advice is to do system reset by pressing the "Power" button key at the front panel and hold it for 10 secs.


Please check also if you can access the "Error Code Log" by pressing the "Menu" "3" "5" "6" "4" in sequence before the unit gone to shutdown.


You've mentioned that the bulb has been replaced just last Sept and now it won't come on. The lamp can't be test using the multimeter but you can make a visual inspection to determine its condition. Most of the faulty lamp has an obvious burnt mark. There's a possibility that the symptoms is caused by busted lamp but in your case, if it is a genuine lamp replacement, then high chance that the fault is not the bulb.


You need to check the ballast board but not the high voltage output of it feeding the lamp. No voltage coming out from the power supply board to the ballast board can produced the same symptoms. You have to check the this voltage at connector CJ1, you must get 325V to 340V. Check also the lamp enable at connector CJ3(pin 4) you must get a low voltage upon turning on the set to confirmed that the mainboard giving a signal.


If there's no voltage at CJ1, then the fault is on the power supply board.

If the readings are normal, and still the ballast won't ignite (you can hear a slight snap sound when the ballast board trying to ignite), then you have to replaced it.


Click the link below to order online.


http://bigtvsale.blogge.rs/2011/05/31/discount-replacement-mitsubishi-oem-pwb-ballast-938p178010/


http://www.shopjimmy.com/mitsubishi-938p178010-lamp-ballast.htm


Please let me know if you need further assistance.


Good luck and take care!


Kind Regards,


Mjsazon

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Flatron w1934s display problems; symptoms are black screen after 2 sec's of power up. i have tried wiggling the monitor cable/nothing, did notice if i unplugged the monitor cable you can see the screen...


hi good day
before you come up that the main board was the problem lets verify first to narrow down where the problem came from. now as you said you have been tried to put a backlight just to know if their is a problem with the backlight but still you have black screen so which mean the inverter ballast is possibly good as will as the backlight. ok here is on how will you trace the main cause you need to turn on the tv unit then check if their is a INV_ON voltage around 3.3V coming from processor going to inverter ballast, now if do not have voltage turn off the unit then disconnect the connector going to the ballast board and turn on the unit check again the INV_ON if still no voltage come out you have bad processor from the main board. now if the case is the INV_ON voltage is present their is a shorted component at the ballast board that is why the screen is going black after you turn on. if their is an error detected the main board will cut off. hope this will help you thanks for consulting through fixya god bless.

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hey there it sounds like the problem is coming from your ballast board, the ballast board is the power source to the lamp. with time this part starts to wear out and get weak your old lamp is already burning out there for it does not need that much voltage to turn on but the new lamp has not been worn out or used there for it needs the ballast to be working at 100%

hope this solution helps

Sep 03, 2010 | Hitachi UltraVision CineForm 55VG825 55"...

1 Answer

I have the 50hm66 tv, replaced the main power supply board, and then the aux. power suppy board, still no lamp (lamp is good), 15 yellow blinks What you think ???


U hear alot of clickings,few mins tv is on?The board call the Ballast board is dead.This Ballast board help to ignite the projection lamp.

Aug 13, 2010 | Toshiba 50HM66 52" Television

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The power swith will turn it on and off by itself. Won't stop


This tv have a colors wheel.U hear grinding noises? Picture flickers black&white.That the indication the colors wheel is dead,need a new colors.U have Lamp LED front Lit up or flashes?That mean the projection lamp life is over,require a new projection lamp.U hear alots of clicking sound?That mean the Ballast board is dead,this board help to ignite the projection lamp.

Jul 10, 2010 | Samsung DLP HL-P5663W 56" TV

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Replaced lamp and reset timer, I think as the


It depends on how much the new ballast will cots, new or used that is another question. Do you see any burnt parts, bad capacitors in the ballast board?

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Aug 06, 2009 | Samsung Televison & Video

1 Answer

Hd50lpw175x7


it should either be secured with screws or plastic clips that need to be pressed in to release the board

Jun 04, 2008 | RCA HDLP50W151 50" Rear Projection HDTV

1 Answer

Hplpw175x7


I would try the power supply first as the ATC336 has a history of the bad power supply boards.If the power supply doesnt fix it then I would think it may possibly be the ballast

May 30, 2008 | RCA HDLP50W151 50" Rear Projection HDTV

1 Answer

Hd50lpw175x7


The power supply is what provides all the standbye voltages that get routed to the various other boards. The capacitors have to be unsolderd and the replacements solderd in.

May 29, 2008 | RCA HDLP50W151 50" Rear Projection HDTV

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