How to discharge tube

Hello
Absence of green is the problem. You see mixing of red and blue, which will look like pink.
the fault must be of its video output card. This card can be located at the neck of the picture tube. Check this card, for any loose solder. This is a common problem seen in most CRt based Sony TVs.
Just resolder all the suspected solder points on this board, by applying a little more solder, without making any solder bridge short in between adjecent solder terminals.
images of two models of sony trinitorn TVs, [back cover opend] has been attached here. you can see the boar under suspection, along with the picture tube neck. [See the rectangulat printed circuit board attached to CRT base]

There are three things you should try. If you can safely pull the back cover out safely, do so. First thing to look for,is the suction cup attached to the picture tube securely? Be sure that it is. Make sure the TV is not plugged in, when you check for a good ground to the Tube (suction Cup). Then plug the TV in and power up. Still no pic? If you feel that this is not the problem, next, pull the board out of the TV. Be sure to discharge the picture tube before you remove the suction cup. Unplug the TV. A wire taped to a flat screwdriver, the other end of the wire connected to the silver braid that surrounds the picture tube. Now slip the screwdriver under the suction cup, you will hear a snap, you have discharged the tube, you may remove the suction cup. And you may pull the board completely out of the TV. Find the vertical IC and resolder the 7 or 9 pins. Do not use excess solder and short the pins together. Each pin must soldered individually and not together. Check for bad solder grounds on the horizontal transformer. This transformer is usually a small square box with five or six pins. When not soldered with a good ground, it will crate the problem you describe. Next, solder the pins on the Flyback Transformer. Resolder any and all power resistors. A power resistor is one of two watts or more. I do not believe your horizontal transistor is bad in this case, you resolder this as well. A bat transistor would hand you a dead TV. Do go over the rest of the board and really look close for any and all bad solder grounds, solder as necessary. Last be sure you have good solder grounds on the back of the small board that connects to the picture tube. I'm sure you will get your picture back, try all of the above and let me know how things go. Thanks for asking and show all hands of support!

Hello
This is a typical fault symptom. Your TVs Line Output Transformer [otherwise called LOT], is shorted. To replace it you should open your TVs back cover. Locate the LOT . It is easy to find out since it is largest component inside. One of its thick wire will be connected to the final anode of the picture tube, at the top side, which will seem as it is sticked to the picture tube with a rubber boot.
The LOT along with that wire is compact, and can be get from electronic spare part shops.
To replace it, you should resolder it out from your TV after opening its back cover. Care must be taken when detaching the rubber boot side, because some storage voltage will be there even after switch off the set. It will retain there for hours. So you must discharge it before detaching it. Go for the same type and number. Sony's LOTs are typical types and you should insist on original.
Replace the horizontal output transistor, which drives the LOT, whcih can be located very near to the LOT , screwed into a metal heatsink. Replacing both at the same time is good.
Take precautions that we must, when working with an electrical equipment. Plug out the TV from wall socket and do the work. Ok

The tv CRT( picture tube) have a radiaton posion infected in ur tv picture tube.This is how u discharge the CRT(picture tube) get the posion out.Take the tv back cover off.Take video board that connected to the CRT(picture tube) out.Plug it in,so u have a live current to the CRT(picture tube).Find a wire like an AV cable,should be find.One side of the metal,grounded to the metal frame somewhere.Take a long needle plier grab the other side of the AV cable wire,not the metal,(Caution high voltage live current).Come very close to the open CRT(picture tube).U will have a live current arc,than u,will hear a big "POP".U,just discharge the CRT(picture tube).The tv now the CRT(picture tube),now it good,it clear of posion infected in ur tv picture tube.Now,unplug ur tv.Put ur tv,back together.Hook up ur tv signal cable and plug in ur tv,now ur tv picture,will be clear,completely.I do this many times to dicharge fuzzy CRT(picture tube).When i was a tv Tech.for the SONY TV Corporation.

get a good magnifier and soldering iron
open thw back cover set unplug leave it discharge for a while and flip over the pc board and try to fin any cracked solder on the espescialy on the right side near the hig voltage transformer and near the power
supply and regulator you may find the bad one
hope that will help.//watch for not speel soldering betwen component pin .regards A S
good luck...

yes they can hold a bit of voltage so a high voltage probe will discharge them nicely, something you might not have but can get from ebay if you are going to do this alot. you don't need to be concerned about this though as you won't be doing anything with them so don't touch..
just be carefull when desoldering these stk's use solder wick and patience even a pro can take an hour to desolder these so be carefull not to lift the trace or the situation will quickly get worse. don't adjust these tubes as they are set to the correct alignment already.

First, understand the dangers of high voltage and charged capacitors inside a TV set! Discharge all capacitors and the picture tube in a safe way before proceeding.

What kind of IC is it?
If SurfaceMounteD:
1. Heat the IC pins and use a solder wick to remove ALL solder tin.
2. Use a sharp screwdriver or a knife to gently lift the IC from the PCB. Pay close attention if any of the pins is still attached to the PCB, if so, repeat step 1. Be careful, if you break the PCB, the Sony is ready for the dumpster...
3. Put the new IC in place, begin to solder pin 1, and then the pin most far away from pin 1.
4. Solder the rest of the pins, as quick as possible to not overheat the IC. Don't care if solder short circuit the pins.
5. Use a solder wick to remove all eventual short circuits that was the result of 4.
6. Inspect one more time to be 100% sure no short circuits remain.
7. finished.

If mounted through holes:
Same as above, with following additions:
1. a possible addition of a solder sucker.
4. The speed is still important, but since the pins are not so close, you should be able to do it without shorting.

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

• Screen looks 3D
• Colors don't line up
• One or more colors can't be adjusted when using the convergence menu.
• Screen is bowed or warped.

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.

Solution #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.


TV set after fluid change



Solution #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.

I could be wrong, but, from your description it looks like a cold solder, most probably in the Filament Heater circuit. If you are well versed in Solid State Electronics, I suggest you look for a loose solder or joint. Shut OFF the TV, Open the rear cover and chech for any dry dolder or loose coonections. Start with the CRT Neck PCB. Follow the tracks from the two Heater Pins (Marked H H) on the base). Also, gently remove the Neck PCB gently from the Picture tube, and (very carefully, mind you!) clean the Picture tube Contact Pins. Again, very slowly and gently, replace the PCB. Try your TV again. Let me know if the problem is solved. As for the second problem, ( less brightness) how old is your TV? Over time the emission from the Picture tube Electrodes becomes less, and picture quality detoriates. If set is over 6-7 yrs old, or if you are a heavy user - that is, you have your TV switched on for 6-8 hours a day, it is time to go for a trade-in. But, if you are very attached to the TV, you can always take it to a service shop, where they will re-condition the Picture Tube for a modest amount. It's life will get extended by a couple of years.

a tap on the side tells me that it's a solder connection broken loose, most likely in the horizontal section. if you have experience with electronic soldering, you can fix it, otherwise take it to somebody that can fix it. thermal expansion and contraction(from turning the set on and off) eventually produces metal fatigue in solder connections, and the connection breaks loose, just enough that it sometimes works, and sometimes doesn't.