Question about RCA P46924 46" Rear Projection Television

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Power wen out due to a fuse. Now convergence is out. RGB are out of sync. Any comman failures, procedures, manuals available?

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Projection TV sets are known to have two common problems. The first problem that is common to these sets is convergence failure. When this happens the TV will usually look 3D, Wavy/Distorted, etc. It may also shutdown and blink an error code.

The second common problem with Projection TV sets is dull video, halos around objects, white looking video, or red overpowers the screen. This is commonly caused by the fluid in the lens being clouded overs.

To get fixed either call in a local TV repair company or goto sites such as www.TvRepairKits.com to get a repair kit with instructions.

Posted on Oct 15, 2010

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How do I fix a converence problem?


Hi.


First try using Autofocus. If there is a convergence problem this won't fix the problem.

Try using the convergence alignment procedure from service manual.

Here the procedure that works on most Hitachi rear projection.

Here the grid with convergence problem

7f474c1.jpg


If the procedure does not work, then the two STK392-110 on convergence board must be replaced.

Before replacing the ICs you can test the pico fuses located on convergence boards. Simply read ohms to test if they have continuity.

Better also testing components on convergence board like resistors located at the base of STKs.

After removing the old STK, the new ones must be re-soldered using cooling paste.

Price for single IC can is about $8/$20. I think
STK392-110 on this model can be better replaced with STK392-150. I suggest contacting the seller on this.

The service manual is available here.

Jan 12, 2010 | Hitachi 50SBX78B 50" Rear Projection...

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Hey tech guy. Have a Magnavox ZV450MW8 DVD \ VCR combo. Unit loses all...


One fix to return DVD player to origional setings, is to go in to the menu and find the factory reset option the will return the setings back to fresh from the factory.

Regards Tech Guy

on Sep 07, 2008 | Panasonic DMRES30V DVD Recorder/VCR Combo

1 Answer

Red and blue convergence wont line up. What should i do.


convergance can be tricky and you should follow a manufacturers proceedure from a manual.

most specificaly start with the green H and V Linearity and center , then the Red and Blue

Projection TV's and Component Video RGB have their Horizontal and Vertical Sync signals on the Green Component..

There may be other reasons for their specific order of operations within a calabration proceedure such as your 'RGB convergance alignment'

Jun 16, 2009 | Hitachi 43FDX01B TV

1 Answer

Blue spot on screen


Hi. this is called convergence failure. the convergence board is a circuit board that regulates the RGB(RED BLUE GREEN) streams that make up the color picture. If the convergence board chips are malfunctioning, you will see a distorted view of these RGB streams. This is what you are experiencing at this time.

Simply replacing the convergence board or chips will fix this issue.

Please rate and have a great day:)

May 17, 2009 | Televison & Video

1 Answer

BLUE ON THE MAGIC FOUSCE WILL NOT LINE UP


HI, normally when this occurs, this will signal a malfunctioning convergence chip that is located o the convergence board. this convergence board controls the calibration attempts when syncing the RGB streams.

Simply replacing the convergence board or chip will fix this issue.


May 15, 2009 | Hitachi Televison & Video

2 Answers

My sb 600 fires with the camera but it seems not illuminate


Definately a settings problem. The camera will only syncronize on one specific speed. Youe best bet is to use auto. For manual, you'll have to set the shutter speed at the sync speed.

Flash Sync Speed
  • up to 1/250 X-Sync Speed
  • up to 1/8000 FP High Speed Sync
  • Red-eye reduction
    Red-eye reduction with slow sync
    Rear-curtain sync
    Slow sync
    Front-curtain sync (normal) Flash Sync Modes
  • 1) i-TTL: TTL flash control by 1,005-pixel RGB sensor, built-in flash, SB-800, SB-600, SB-400: i-TTL balanced fill-flash and standard i-TTL flash
    2) AA (Auto Aperture-type) flash: Available with SB-800 used with CPU lens
    3) Non-TTL Auto: Available with Speedlights such as SB-800, 28, 27, and 22S
    4) Range-priority manual flash; available with SB-800 Flash Control
  • Mar 13, 2009 | Nikon Speedlight SB-600 TTL Flash

    1 Answer

    Blue light (RGB) will not converge (Toshiba 50H72)


    Look around the area of the STKs and you should see some low valued resistors. One lead of which will be attached to the STKs. One or more of these is open. Replace it/them and you should be fine. These are current limiting resistors (effectively fuses) for the power to the STKs. One of them is not getting power.

    Dan

    Jan 23, 2009 | Toshiba 43H70 43" Rear Projection...

    1 Answer

    Power problem on Pioneer Pro-700HD


    The failure is not on the power supply but the convergence amplifiers STK ICs have the 24 volts shorted.
    If that fuse is blowing, de-solder the convergence ICs and put a new fuse to power up the TV; you should see distorted video when the TV powers up and the fuse should not blow.
    The service manual migth not help much in this case since the failure is easy to pin point.

    Good Luck.

    Oct 03, 2008 | Pioneer PRO-700HD 64" Rear Projection...

    1 Answer

    RGB COLOR PROBLEM.


    You will need to check the plus and the minus convergence voltages in the main power supply. There are a couple of circuit protector fuses that go bad. Do not replace these untill you replace the convergence IC's or you will cause more problems in the main power supply. Good Luck

    Apr 22, 2008 | Samsung HCM653W 65" Rear Projection...

    1 Answer

    Green Picture


    The problem sounds like one I had. If so, the cause is as follows.

    The Daewoo ouputs synchronisation information on the green channel of the RGB outputs (which are pins in the SCART socket) The Panasonic TV automatically preferentially selects the RGB input in the SCART rather than the composite video signal in the SCART. The video circuits in the Panasonic should ignore the sync on the green channel but instead interpret the sync as green signal information which means the adjustment of the green channel is upset leading to a very green picture.

    Possible solutions:
    1. From the TV, manually select composite video input, not RGB. This may not be possible - I think the TV automatically goes for the RGB if it is present.
    2. Disconnect the wire to pin 16 in the SCART socket. This is the signal from the VCR/DVD to indicate that RGB is available. Disconnecting it means the TV defaults to the composite video. This is what I did.
    3. Connect the TV to the VCR/DVD using component or S-VHS leads only.

    Jan 13, 2008 | Daewoo DV-6T955B DVD Player/VCR

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