No voltage to convergence chips

First is consider what the issue is: nothing moves convergence wise or only one color etc.

Also follow if needed the voltages from the pico fuses involved---one will be a negative voltage and the other a positive one--follow them from the diodes for each voltage to the chips---"Got Voltages?"

Some simple advice---if resistors are smoking one of the chips is shorted----The set has two voltages that go to them--one a positive voltage and one a negative voltage.

If either chip is shorted you can replace the resistors all year and not get anything. The resistors are protection in case one or both chips short----

Remove all old heat grease and install two new chips and replace the resistors at the same time.

Note that the set may have pico fuses on the power board also.

Three blinks is short protection.

97% of the time it means one or more of the 2.2 ohm blue resistors around the two convergence IC's is OPEN.

There should be 8 or 10 of them: light blue in color and will have 2.2 printed on them ------look for any that are slightly discolored or white in the middle.

What happens here is if one opens====one of the two convergence chips got it----they can be tested in place like testing a fuse===no reading across any of them and it is gone-----set detects no voltage reaching the chips(Usually STK-392-110---black in color and on metal heat sinks with fins side by side.)

DO NOT JUST REPLACE THE RESISTOR IF YOU FIND ONE BAD=ONE OF THE CHIPS GOT IT.

I have start to finish, step by step instructions showing what is needed and the best way to replace the chips etc.

FIRST: LOOK TO SEE IF any OF THE RESISTORS ARE GONE. (BAD)

If you want the instructions let me know and I will post them here for you.

Regards, SD TECH


FYI= Whoever told you to replace the output transistor does clearly not know these sets very well as it will produce a 5 blink error code.

57h82 uses two STK-392-110 CONVERGENCE chips---you need to replace both and check all the resistors around them---an open resistor means one of the chips failed.

You can buy both chips on Ebay for less than 12 dollars plus shipping--they are black--about 2 inches wide, 1 1/2 inches tall with 18 pins each and the STK number will be printed on the face of them in white letters; You need a good soldering iron, solder, a desolder braid, liquid flux, heat sink grease, denatured alcohol, and the ability to get at them: they are mounted to two side by side metal heat sinks with fins.

Once you locate them and unsolder them and the heat sinks from the board--replace both after cleaning the bottom of the board with denatured alcohol--removes any flux and solder particles---apply liquid flux before you unsolder them--these sets use lead free solder and the flux makes it easy to unsolder them. Once they are removed check all the resistors around them---one open resistor and the repair will not fix your problem---install the new chips with heat sink grease on them and install each chip/heat sink back into the circuit board.

Apply more flux to all the pins on each chip and solder them in----good idea to clean with denatured alcohol again and take a close look to make sure all pins are soldered and not touching each other.

If you get this far and the set now seems to work you need to use the original remote for the set and adjust the convergence--either in the customer menu or access the tech menu and adjust it there.


A service manual will not do you much good for this type of repair--it is a hands on repair.

I do this here for free, so if this has helped you take a moment and give me a vote here.


If you have any questions or need help contact me by replying to this posting.

SD TECH

Usually in these sets the 2-2 error code is a shorted convergence IC----they are protected in most models (don't know your exact model number) by two pico fuses(they do not look like glass fuses and are usually in the power supply--little green parts that look like small resistor--amperage is marked on them and usually they are 5 amp) the fuses can be checked like any other type of fuse---if one or both of these are open the set will detect no voltage to the convergence chips and shut the set down. If you locate the convergence chips look for any discolored or burnt resistors around them----in most models they are light blue in color and marked 3.9 ohms---if any are white in the middle they are gone---

I do this here for free so if this helps you give me a vote here.

if you need direct help: [email protected]

Your TV most likely a convergence 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 are some photos of convergence problems.




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

You will need to replace the convergence chips and possibly some convergence resistors and pico fuses. Its a fairly easy DIY job or you can call in a pro. If you want to do the repair yourself check the site www.TvRepairKits.com. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, thermal paste, email/phone support, etc.

Did you replace the resistors when you replaced the convgence chips? If one of them was bad you would still have the problem.

Here are some of the most common symptoms and example photos.

• 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


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 email and they will put one together for you. Their kits includes photo instruction guides, original Sanyo STK chips, convergence resistors, pico fuses, etc.

You may still one more resistor opened , samsung most of the time its 2 low ohms but can be 3 it will be same value as other 2. I think they are 2.7ohms or 3.9 How to Enter Service Menu for convergence Turn TV off Press Mute 1-8-2-power now you should be in convergence use vol- and vol+ to select an item Use mute and menu to adjust when done Press ADD to save adjustments made.

replace ic chips pt# stk392-120 or stk392- 150 and there are 12 resistors located near ic clips pt# 6r8 ( color code blue - gray - gold - gold ) board location no#s 3149 thu 3160 if you look close you may find two resistors discolored as i found on my convergence circut board , also use heat sink compound on new ic chips , take your time to mark all wire connectors going to board from tv , also use .022 dia gage rosin -core solder and a 15- 25 watt soldering iron you may have to adjust the red - blue convergence afterwards my tv set is 3 yrs old also ( thanks holbert )

There are black in color circuit protectors in the set that have blown because of the bad convergence IC's. You will need to measure the voltages on the ICs and make sure you have the correct plus and minus voltages. There should be about + and - 24 volts on each IC. I'm afraid the only way you will know what voltage are what and where they should be would be to get a service manual. i am sorry i do not have this model to share with you. Good Luck.