Question about Hitachi 61HDX98B 61" Rear Projection Television

3 Answers

Video blanks out, power light turns off, power supply shut down

TV comes on and displays the OSD menus. If left alone, power will stay up on the TV. All leds and power supply voltages check correct. When an antenna connection is selected, the video will display for 10 to 20 seconds without any audio then the video blanks out and the power on light goes out. All of the power supply and deflection chassis leds stay lit. A few seconds after that, the power supply crowbars and shuts down. Using the audio test function in the OSD menu (no video input), there is no sound and after a few seconds, the shut down sequence occurs. The DM-1 control module should blink the power led twice when AC power is plugged in, but I do not see this. I removed the main chassis and power supply, checked both with an ESR meter, checked for shorts on the deflection board, used a lighted magnifier to check for cold/cracked solder joints, re-soldered any that even looked dull and repaired a solder bridge on the -13V drive transistor. Any help would be greatly appreciated.

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  • 4 more comments 
  • Rick Corey Jun 27, 2007

    The repair manual only shows a block diagram for the DM-1
    control module, no schematic or parts list. The manual refers to the DM-1 as a "non-repairable front end module" and it contains the main microprocessor, the ntsc & atsc decoders, the osd generator and video and audio demodulation. I made a visual check and there is no fluid leak evidence on any of the circuit boards below the CRTs.

  • Rick Corey Jun 27, 2007

    I had clicked on the "another solution" before I added my comments, sorry.

  • Rick Corey Jun 27, 2007

    Removed the front control panel module, checked the caps with my ESR meter, all checked good. Ohm checked the diodes and transistors in circuit, no shorts. Remote control functions correctly, panel switches function correctly. Scoped the power on signal from the DM-1, it goes low at the same time the video blanks out. Appears that the DM-1 is not working properly or is detecting some other problem. Had a similar problem with this set while still under warranty and the service guy that Hitachi sent out replaced the activation plug-in card.
    Have been trying to scope blanking and shutdown signals, but it is very difficult to get at connector pins to see what is causing the shutdown.

  • Rick Corey Jun 27, 2007

    I have full screen video when the antenna is selected, but no sound. When the problem first started, I had sound and video for a few minutes before it blanked and shutdown. Will scope the 130V B+ and other voltages to see if any are dropping when the video is selected.

  • Rick Corey Jun 28, 2007

    Monitored B+ while switching from OSD to video, no change in value (130V DC). Monitored other voltages with the same result. All leds remain on (not blinking) as described in the service manual until the power supply shutdown occurs.

  • Rick Corey Sep 07, 2007

    Dyllan,
    I determined that the problem had to be coming from the DM-1 tuner assembly. Sent it to PTS for testing and repair. They got the same symptoms that I was seeing and, after working on it for 2 weeks, declared it unrepairable. Rather than invest another $700 or so to replace the module and be stuck with 10 year old technology (no hdmi, no component video, etc.), I decided to replace the set. Thanks for checking back on this.

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Are you still working on this one? It's been more than 2 months, so I thought someone should check in. If it still isn't working after the last advice given here, can you give us an update of the current status, so we can see if there's any other suggestions to be made?

Posted on Sep 07, 2007

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  • Master
  • 934 Answers

If your PS waveform drops out it could be your 130v regulator (photo coupler) IP05 Hitachi p/n#2000465... The load would change when simply displaying an OSD to then creating a full screen raster. And something beyond that could be loading it - like the vertical IC601. Do you have a full vertical deflection when you select antenna?

Posted on Jun 27, 2007

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  • 3,130 Answers

There are bad capcitors in the control board, there are bad tact switches on the control board,or the CRTs are leaking fluid onto the printed circuit boards Good Luck

Posted on Jun 25, 2007

  • 1 more comment 
  • Larry  Dillon
    Larry Dillon Jun 27, 2007

    How did you check what I wrote for you. There is no way to fix it magicly. You will need to check what i wrote .

  • Larry  Dillon
    Larry Dillon Jun 27, 2007

    Unplug the front control boardwith the front panel control switch on it, and make sure the remote sensor is disconnected.

  • Larry  Dillon
    Larry Dillon Jun 28, 2007

    Check and/or replace the opticoupler

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Tip

Diagnosing video problems on TVs and monitors


The first thing to always check is the MENU (osd - on screen display)

Push menu or display on your tv or monitor

- if the menu is clear, the problem is in the early stages of video or outside your device (could be the source (dvd, cablebox) or input connections

- if the menu is distorted, the problem is definitely a malfunction with your device the osd is generated from (tv menu distorted = 100% tv is problem)

* you can also use other OSD signals to troubleshoot - if the volume bar or display info (input label, info bar) is clear, problems are earlier in the circuitry or outside the device. don't be fooled by translucent menus or cablebox menus.

** osd is inserted in the picture in the later stages of video processing. if your osd is distored, suspect the circuitry after the video switch. this could be a bad LVDS cable, TCON or Logic board, or even a bad lcd panel, plasma panel, crt.

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pete

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