Question about Toshiba 51H84 51" Rear Projection HDTV-Ready Television

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Blinking red light

The set just blinks red light i foud in the furom that the convergance chips could be bad but what fuses do i chech to make sure or can they go bad and not blow a fuse

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  • lucked Apr 11, 2008

    oz i have checked the one and only glass fuse and i have checked the small black fuses on the boards are their any more glass fuses hideing that i may have missed?

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Dear Lucked

I would say that you should start by checking your internal fuses that will be located usually nearest the power cord input on the PCB. You will know these fuses because they look like normal plug socket fuses but only are glass. Look for either the bridge recifier (if on a DC signal PCB) or the power transformer that either steps up/ down the voltage to a more manageable median. When you find either of these components, the glass fuses should be fairly close by.

In addition to your question, yes these fuses can blow, but they are designed to save your components from being blown to bits by surges or spikes, even general wear and tear from thermal pressure on the glass can break the fuses.

If the internal glass fuses blow, not all of the time the fuse at your plug socket will blow, but in severe cases this is possible. In order to prevent this from happening in the future, make sure your lekky bits are on a surge protector and you maintain correct gapping/ spacing of your consumer electricals from furniture. On TV sets, you should leave at least a 45mm spacing from your set to furniture. Personal computers should be at least three times this.

If you are good with electronics and are confident that your knowledge is sufficent to overhaul/ replace the convergence chips, then make sure your DISCHARGE ALL COMPONENTS THROUGHLY BEFORE WORKING ON THE SET and ensure you use the correct IC extraction tool and tools for the job, in addition to this, an anti static wrist strap will be of good use in order to prevent you damaging your components by electrostatic discharge. Always place your components on antistatic bags (get these from computer shops) and remember TELEVISION SETS CARRY VERY HIGH VOLTAGES. so treat every component as carefully as your life, and do not attempt to rapid discharge electrolytic capacitors by shorting the terminals, the same applies for the tantalum type. If in doubt, leave the unit for 2 days to thoroughly discharge all mains electricity (unplugged from the wall, and remove the plug so nobody accidently plugs the unit in).

Last of all, GOOD LUCK, AND I HOPE IT GOES WELL FOR YOU

SShould you have a comment or a question, then im on hand here all of the time, so drop me a loggy and i will respond. :)

best wishes

oz

Posted on Apr 10, 2008

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I would suspect the problem is in the convergence circuit---only one simple way to know---get at and un-solder all 18 pins on both the STK chips it uses.

Once they are free try to turn set on--if it comes on one of the chips is bad and both will have to be replaced.
12_6_2012_12_54_51_am.jpg

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If the thermal fuse is bad the set will not operate but will have a specific blinking code of the red light----it will blink a sequence of blinks like 5 blinks, a pause and repeat it over and over.

Model number? Blink code?

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3_30_2012_2_06_25_pm.jpg

convergence chips used in this set look like these

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Your TV most likely has one of two possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
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  • Colors don't line up
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Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

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TV set after fluid change

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2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc

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