Toshiba TP48C90 Convergence (replaced ICs, worked for 2 days)

U know how to use a multimeter right?Check and replaced all the resistors near the 2 convergence ICS.Most resistors are big and blue core in colors.

It could be that this time the convergence module went. I have replaced many convergence ICs and don't believe I have ever had any go out within 6 months. That does not mean that they can't. Remove the leads from the convergence area to isolate the ICs as you said you were told. Now remove the digital convergence board which should be nearby and probably will be in a metal box for noise protection. If you can I would unsolder the convergence ICs to totally take them out of the circuit and just in case one or both shorted out. Once everything I talked about has be removed try the unit. If your problem is in the convergence only your set should work but have an ugly picture. Let me know what you find and we will go from there.

hardrocko

Same problem. Replaced both convergence ICs about 5 months ago. Worked fince since then and just recently no sound, no video, blinking red on front panel and clicking sound. I suspect that the ICs went bad again and blew a resistor or two. I used cheap Chinese ICs instead of the Sanyo ones and thing this is why. I'll be looking at it again and post solution.

Bad chips...There are a ton of cheap fakes out there....Or bad resistor...

Projection TV sets have several common problems listed below.

Problem #1) Convergence

Symptoms:

• Screen Looks 3-D
• Colors wont align
• Screen may look distorted
• No Audio/Video - makes a chirping sound.

Example Photo:

Problem #2 CRT Fluid has clouded over.

Symptoms

• Dull Video, Washed out
• White/Bright looking video
• Halos around objects
• Red/Orange looking

Example Photo:


You can see more examples and find a fix here...

http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

You need to replace both convergence ICs numbers STK392-570 this is an easy repair which requiresasic soldering skills. you can get replacement ICs that come with free step by step instructions with pictures so you can do the repair yourself, they also provide free on line tech support in case you have any questions . Heres the link
http://servicemanuals.vstore.ca/

Green isnt controled by the Convergence ICs that is controled by electrical settings programed into the service menu. You will no doubt need to troubleshoot your set. I work for a site that sells service manuals that are emailable and will provide free unlimited support to help you do the diagnosing and order any parts you need. If you would like me to post a link, let me know.

good job

If you did not use heat sink compound then you probably have not hurt the new IC's yet but you should remove them and add the heat sink compound NOW. If the convergence IC's are bad then you will have access to the convergence menu but the adjustments will have no effect. The fact that you switched the IC's and got the same results shows that the IC's are good. If your red convergence is still way out when the new IC's are installed then the old IC probably burned out the low value resistor associated with the Red Vertical (RV) channel.

Toshiba 57H81 57 in. Rear Projection Television Go to above under solution for tip on fixing your problem.

need to replace 2 stk392-110 convergence ics