Question about Hitachi 53UDX10B 53" Rear Projection Television

1 Answer

Ballast So is their multiple ballast? One for each lamp?

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  • kreed13 Apr 24, 2008

    I didn't mean to Refuse yours and accept Jaime. Was reading them all and trying to figure things out when hers got clicked. Sorry.



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  • Hitachi Master
  • 19,396 Answers

Please post the question in the premium thread, where the problem had been described in detail. The expert credited with accepted solution (Fixya) will answer.
here is the link:

Posted on Apr 23, 2008

  • 1 more comment 
  • Ginko
    Ginko Apr 23, 2008

    you can also use Ask me button on Jaime, my solution has been already refused, it is fair enough that the credited expert keep troubleshooting the problem .


  • Ginko
    Ginko Apr 25, 2008

    I donot want to push you in accepting my solution or refusing other expert help, but if you did not mean to refuse go back and refuse or accept right solution. I do not think it is fair that another expert get payed while I am being asked to work at this in his place.

    In your case you have to test boards inside.

    There is one main power board and 3 PWB boards for the lamps (R, G,B) (some seller call these ballast, but this can create a problem). You need to test first the main Power PWB, then if it is not that the test the 3 PWB on the lamps .
    Here is a general troubleshooting diagram for locating the problem with diags etc..

    Here is the diagram for testing the bpoards, start from PSU:

    Here is PSU schematic

    Here are RGBs.

    I Can waste 15 or 20 mins in uploading the whole service manual (worth $15) in regular pdf format, but at this point you really need to decide what expert you are asking to. I am sure other expert will have service manual the same.
    It is your choice.


  • Ginko
    Ginko Apr 25, 2008

    One more thing , if you buy parts buy straight from hitachi , it is safer and less risk to buy wrong part. To find out were the problem is you need to test boards into TV, distance troubleshooting is just bit more than a startup point.




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Posted on Jan 02, 2017

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SOURCE: Panasonic PT-45lc problem

I took the rear bottom off of the set,lots of screws to take off.
On top of the bulb housing is a small yellowish thermal fuse.

I took mine completey out,jumped the black wire together,and bingo.set works perfectly.

Posted on Apr 16, 2008

  • 8617 Answers

SOURCE: ballast replacement

Your set uses the Phillips UPH100W 1.3 100 1amp bulb part number 6912V00006A which uses Ballast EUC 6913V0002A and the actual ballast isMB03CA part number 6871VSMB13F I would contact LG and give them these numbers. Is your ballast bad or is the BallastEUC bad? Let me know if I can help you further.

Posted on May 12, 2008

  • 98 Answers

SOURCE: Mitsubishi WD-52525 Lamp ballast

Contact Mitsubishi Parts themselves, 18005537278. They are very friendly.

Posted on May 15, 2008

  • 1 Answer

SOURCE: Need to buy a lamp & Ballast

Posted on Dec 20, 2008

  • 1 Answer

SOURCE: 52HM84 Toshiba DLP with apparent failed lamp (replaced ballast)

I found R3 on the original board to be open, along with reading an open on CR1, D5 and D6. All the other transistors and the transformer check out. The only thing I have to do now is find out the specs of the diodes. The replacement board also had CR1, D5 and D6 open (R3 was OK). There had been some threads on various locations where remanufactured boards had bad components (the transistors were changed but not some of the other components).

Posted on Jan 18, 2010

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1 Answer

TV Model: Sony Wega KDF-55E2000 Projection lamp warning is on..and today a light red bar appeared at the top of the screen and light blue on the this because the projection lamp needs to be...

There are two possibilities for this fault with Sony Projection tVs. The first is with the lamp itself. The second one is with the lamp ballast baord. Replace the lamp ballast board first. Because, it there is any internal winding short in the inverter transformar of the ballast board this type of fault can occur. you have to replace the ballast baord along with the new lamp anyway. Therefore, replace the ballast board first. If this help you, there is no need ot replace the lamp. Picture of the ballast included here for you to compare.

gopakumarg43_36.jpg If replacing the ballast dis not help you, change the lamp too. OK.

Aug 31, 2011 | Sony KP-57XBR10 57" Rear Projection...

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I have a Sanyo plc-xt25 LCD Projector and when I plug my ac cord in, the fans turn on but no lamp comes on. I changed the lamp and still no picture. What do I do?

Every projector lamp is equipped with ballast. The problem area is ballast. Either the ballast is not getting DC supply or the lamp turn ON signal from the projector main board or the ballast is faulty. Remove the lamp. Connect the projector to the mains supply. Check the voltage at the lamp connector inside the projector without turning it ON. It should be around 65 volts A/C. (Warning: Multimeter will get damaged if the projector power is turned ON due to generation of high voltage) If you find this 65 volts then it confirms that it has DC supply & the ballast is functioning. The ballast receives the the turn ON signal from microcontroller through opto-coupler on the ballast. The ballast opto-coupler can be checked by providing external 5V DC supply between pin 3 (+ve) & 4 (-ve) in turn switches ON the lamp. If this works then there is no problem with your lamp & ballast. The problem lies with the main board. If this does not solve your problem then give me the feedback.

Aug 04, 2011 | Sanyo PLC-XT25 LCD Projector

1 Answer

JVC DLP MOD#HD55G466 what is the voltage from power supply to ballast and into the lamp.I have no voltage to the lamp could it be ballast?

Ballast board gets voltage from power supply connector CN90BL and volts readings are as follows:
Pin-1 = 380V DC
Pin-2 = Ground
Pin-3 = 15V DC
and output of ballast board would be 12,000 volts AC that goes to lamp to generate spark in its electrodes to produce high bright light.

If you get volts on input of ballast board but still lamp does not fire up then ballast board is not working.
Ballast board part number is QAL0765-001 and available with for $125
Hope these info will help you.

Nov 16, 2010 | Televison & Video

1 Answer


Ballast Board Powers Lamp, the 2 plugs on Lamp connect into Ballast
board just follow the wires from where lamp plugs into.
Does Ballast have a ark coming from a componet on board and does the main capacitor Look Vented or puffed up on top?
Remove Lamp turn TV on see if Ballast has a ark coming from a Big Whit/blue writing on it spark cap?

Feb 19, 2010 | Toshiba 62HM95 62" DLP HDTV

1 Answer

Where Is the Ballast.

The ballast is on the other side of the lamp compartment. the lamp plugs into the two short leads that are attached to the ballast. Its a small circuit board.

Jun 13, 2008 | Zenith D52WLCD 52" Rear Projection...

1 Answer


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.

Jun 09, 2008 | RCA HDLP50W151 50" Rear Projection HDTV

1 Answer

Ballast replacement

Your set uses the Phillips UPH100W 1.3 100 1amp bulb part number 6912V00006A which uses Ballast EUC 6913V0002A and the actual ballast isMB03CA part number 6871VSMB13F I would contact LG and give them these numbers. Is your ballast bad or is the BallastEUC bad? Let me know if I can help you further.

May 12, 2008 | LG RU-60SZ30 60" Rear Projection...

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