Question about Hitachi 51F500 51" Rear Projection HDTV-Ready Television

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Red gun goes off and loose red color. Once and a while it will come back on. suspect a cold solder joint

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Quite possibly but it could be intermittant heaters in the red tube. Check when faulty!

Posted on Dec 31, 2010


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Ive used the picture control to get the redness out but its still really red what can i do

Check the video output section circuit board for any loose solder joints. This board can be located at the neck of the picture tube, plugged directly to it at its back. It is best to re-solder all the suspected solder joint there, by applying little more solder, without making any solder bridge short in between adjacent solder terminals, as it will be very difficult to locate loose solder terminals, as they might be microscopically small.

Jul 20, 2012 | Sylvania CD202SL8 TV

2 Answers

Color balance is off. Colors change between over saturated red, blue or green

you color wheel may be going out or it may be as simple as a loose conenction on the back or a loose port connection?

Jun 22, 2008 | Sony Grand WEGA KF60WE610 60" Rear...

2 Answers

1999 Panasonic CT-3269SW No picture; just a colorful horizontal line through the center of the screen... tilting & tapping used to pop the picture back. No longer responds to this method; just stuck...

Sir the problem of your unit is the thermal intermittent caused by cold solder or dry joints in the solder part of your unit specially the vertical section of your tv.

It is much better if you use a magnifying glass to determine the cold solder joint or dry joints. To fix this just resolder this cold solder using a soldering iron, soldering lead, desoldering pump, Note be sure not to connect separated pin if accidentally connected may caused much damage to the unit hope this help good day and best regards.

Sep 23, 2011 | Televison & Video

1 Answer

Green comes and goes. Red and blue work good.

There is some loose soldering joints in the green base card board. Open it and locate the board, resolder most of the suspected joints by applying a little more solder, will solve your proble. You must have a good quality soldering Iron, solder wire, concept of soldering and more patience. OK.

Mar 24, 2011 | Hitachi 57F500 57" Rear Projection...

1 Answer

I have a Mitsubishi WS 55908 and is has lost its ability to show the color green. What could be the problem?

Hi jazz836,
You're unit has three color gun inside, the red/blue/green gun, since you haven't a green color, green gun is dead. This is caused by faulty resistor, tube, transistor, bad solder joints. If you have necessary tools and test instrument look first for bad solder joints in the neck board, re-solder all cold/dry joints, unplug then re-insert all cable connected. Test the parts in that board and also the tube.
If you can't do the job yourself I would advice you to look for a technician to isolate the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Mar 10, 2011 | Mitsubishi WS-55908 55" Rear Projection...

2 Answers

Hi my name is jeremy snow and i have recently had problems with my sony trinitron xbr 1997. lately the picture like scrunches up into the top of the screen and the tv just goes black and now like sometimes...

This is typical with many sets when it goes old as there is a high possibility that the components over a period of heating and cooling , tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs.

Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points. Please find below a links for tips on poor start ups.

It is possible you need to check the soldering at the deflection circuits/audio sections as the picture/sound comes back due loose joints which contacts when the circuit is lifted. Solder all the suspected joints with a good light to assist and make sure there are not solder bridges.

Feb 05, 2011 | Sony Televison & Video

1 Answer

My screen has no red color. I assume the red color gun has gone bad. Is this it? How expensive to fix? Is there a do it yourself cheap fix?

Its most likely a problem with the Red CRT drive board. If the tube were to fail you would have either a red screen with lines, or the set would shut down. Often its as simple as a bad solder joint on the CRT socket on the Drive Board. I would check the board very carefully for signs of bad solder such as dull ( Indicating Cold solder ) or actual cracks in the solder. If all solder looks good I would try replaceing the Drive board.

Jul 02, 2010 | Sony KP-46WT510 46" Rear Projection HDTV

1 Answer

Quasar 33 inch tv model number sp3136k

You more than likely have a cold solder joint, and moving the tv caused the hair line joint to crack open just enough to prevent current from flowing. But before you start soldering, give it a good inspection inside for a loose connector and/or wire. If no luck, take a solder gun and lightly hit the largest joints first, which are part of the largest component on the circuit board. It has a thick red wire coming out of it that goes to the tube. (Do NOT touch this red wire or disconnect it from the tube. It can still shock you, EVEN WITH THE TV OFF. This is a very high voltage with low current and probabliy will not kill you, but it will hurt very badly, so just be careful and stay away from the big red wire coming out of the tube.) Then resolder all the larger chips, transistors, and capacitors. If still no luck, then resolder the hundreds of smaller joints.

Mar 03, 2008 | Televison & Video

1 Answer

No Red- Intermittent


A short answer, YES. I suspect a cold solder on the red drive transistor. That transistor is one of 3 identical components (one for each of the blue & green). They are normally found in a small squarish PCB that is connected to the rearend of the picture tube. In some instances, they are also heatsinked. More often you need to remove the shield/screen protecting the foil side of the PCB. This has to be done gently since it can easily crack the glass holding the pins.

Cold Solders are corrected by applying heat from a soldering iron and probably a dab of solder lead. Solder joints should be shiny (not dull gray) with no air bubbles.

If your concern has not been corrected after completion of the above procedures, you may need to replace the red drive transistor. it might also be worth your while to check for any other component that may suffer from cold solder and/or any loose connection(s).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FIXYA.

Feb 15, 2008 | Zenith A27A11D 27" TV

4 Answers

Redless screen

If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's and CRT monitors are very hazardous to service. Even when plugged out, they can store very high, deadly voltages. How old is the picture tube? If there's lots of phosphor burn on it, chances are the red gun inside the picture tube is out. A sure-fire way requires an oscilloscope. Check the voltages on the three color guns at their corresponding pins on the CRT's neck board. You can see their levels change as you tweak their adjustment pots on the neck board. If the red voltage is present and at the same levels as green and blue, then the gun inside the tube is shot. If the red voltage is NOT there, then you can work backwards and find out where you're losing it. It could be a bad buffer amplifier (transistor or I.C.), bad solder joint, or even a broken wire in the cable harness. check for cracked solder joints where the RGB, Grd Sync connector is. check the pins on the molex power supply connector, could be that the pin for the red is pushed back and is not making contact. Try swapping the red and green inputs if you see red on your monitor and no green, then it is NOT the tube. If you see no red still but still get a green where red should be I would suspect a bad chassis.

May 28, 2006 | Samsung SyncMaster 551 15" CRT Monitor

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