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Toshiba 42HM66 Support Question

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Question posted by kayjay691123 on December 11th, 2011

What The Ballast Looks Like On A 42hm66

I am not sure if the issue is the lamp or ballast. Can you help?

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Answer #1: Posted by TVDan on December 11th, 2011 4:39 PM

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The ballast is the circuit that's located next to the lamp assembly behind the plastic (located toward the front of the set) with the wires from the lamp connector going to it).

This could be very difficult to isolate without having the optical unit removed in the service position, or without a known good lamp. remember the ballast will not get the power on signal until the color wheel spins up to the needed 1800 rpm within a couple seconds first. so if you hear a sound like a loud fan going bad, then the color wheel is the problem and a new optical engine is needed (it will include a new ballast).

If there is no bad fan sound then remove the lamp cartridge, replace the lamp door, and power the set on. Listen next to the lamp door for arcing sounds just after the color wheel spins up. If you hear this arcing sound then you know the DMD board is activating the ballast and the 5000 volts is being developed. Then reinstall the lamp and do the same test. If you still hear it arcing then the problem is either the lamp is cracked or the ballast circuit is arcing.

TV Dan

Related Toshiba 42HM66 Manual Pages

Printable Spec Sheet - Page 1

...L I M I N A RY S P E C I F I C AT I O N S S U B J E C T TO C H A N G E 42HM66 42" (measured diagonally) INTEGRATED 720p DLP® KEY FEATURES VIDEO Texas Instruments 5th Generation DLP® Chip 3DYC Digital Comb Filter 135 Watt Lamp AUDIO 20 Watt Audio Output Bass and Treble Controls CONVENIENCE ATSC/QAM Digital TV tuning (with NTSC Analog Tuning) HDMI™ Digital Input Dual ColorStream®...

Printable Spec Sheet - Page 2

AUDIO New Two-Tone Bottom Speaker Cabinet Design - Incorporates 5th generation DLP technology from Texas Instruments for our best 720p picture yet. New sleek design looks great, yet gives wide a 16:9 42" HDTV with a smaller footprint than a conventional, analog 36" picture tube set, allowing a fit into many of today's armoires ( 42HM66 TECHNOLOGY & BENEFITS VIDEO 5th Generation DLP® -

Owner's Manual - English - Page 1

.... OWNER'S MANUAL Integrated High Definition DLP™ Projection Television HIGH-DEFINITION TELEVISION Note: High definition programming is required to these numbers in the spaces below. Record these numbers whenever you communicate with your TV. All rights reserved. Please contact your cable or satellite provider. 42HM66 Owner's Record The model number and serial number...

Owner's Manual - English - Page 2

... and/or brightness of resulting in the triangle tells you should replace the lamp unit; If the lamp ruptures, the TV will help you use the lamp beyond its service life: • you may fall over . Note: The lamp unit contains mercury. THIS TV IS NOT INTENDED FOR USE WITH A PC. Copyright © 2006 TOSHIBA CORPORATION. 1 Important...

Owner's Manual - English - Page 3

... avoid possible electric shock or fire. • To prevent personal injury, never handle the damaged television. • ALWAYS contact a service technician to project the picture, and requires special safety precautions: • See pages 32-33 for your TV: 17) Never modify this equipment. Install in cabinet, or any time it exits the apparatus...

Owner's Manual - English - Page 4

... the approved method for 6 to 7 hours to allow the condensation to evaporate. 38) When the TV reaches the end of its service life: The lightning symbol in the lamp will • Use extreme care to make sure you use only replacement parts specified by the approved method for long periods of time. For...

Owner's Manual - English - Page 5

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Owner's Manual - English - Page 8

... twin-lead 300 ohm twin-lead COMBINER (Not supplied) IN OUT or 75 ohm coaxial cable Cable TV (CATV/DTV) connection • A 75 ohm coaxial cable (F-type) connector is necessary for easy... hookup. This type of the scrambled channels. VHF/UHF Combination Antenna Cable TV lead-in VHF, UHF or VHF/UHF combination antenna 75 ohm coaxial cable (round) or 300-...

Owner's Manual - English - Page 9

... , S-Video, ColorStream HD-1, ColorStream HD-2, HDMI. 6. Receives infrared signals from the remote control. 7. LED indicators for lamp and power (see "Side panel controls," above). Opens and closes the menu system. 2. IR sensor - Note: The TV's INPUT key is on -screen, change the channel. When no menu is on -screen, function as up...

Owner's Manual - English - Page 10

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Owner's Manual - English - Page 11

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Owner's Manual - English - Page 12

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Owner's Manual - English - Page 13

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Owner's Manual - English - Page 14

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Owner's Manual - English - Page 29

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Owner's Manual - English - Page 31

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Owner's Manual - English - Page 32

... injury. 5. All rights reserved. Allow thTeHlISamPpROtoDcUoCoTlYfOorUaRtSlEeaLsFt. one (1) hour before opening the lamp unit door. The lamp has a limited service life that varies depending on page 33). 1. however, if the lamp unit is warranted only for this TV is provided with all projection TV's that use and user settings. Required tools: Manual Slotted screwdriver. STOP...

Owner's Manual - English - Page 33

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