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Convergance issue Philips

Philips 46pp8621/79
I assume it uses the STK392 - 120 chips but which resistors do I need to change.
Would really like to know where I can get these from as I am in Australia

Thanks

Paul

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  • pbross Sep 12, 2008

    Thankyou for your prompt reply.

    I will check out the items

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Yes it uses ywo STK392-120 ICs and there are also 11 6.8 ohm 1 watt resistors. You can get the parts at the following link.
http://servicemanuals.vstore.ca/

Posted on Sep 11, 2008

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I have rerplaced the convergance IC's and resistors but now the picture looks keystone what ealse do I need to change


If its a Toshiba either you did something wrong (set has 3 convergence yoke plugs that are identical but have to be plugged in correct socket) or you missed an open resistor near the chips---most of those are 1.8 to 2.7 ohms and will look perfect---I always check all of them when replacing the chips.

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I have red convergance problem.. This is the second time I have replaced all diodes and the stk chips. they dont have any 110 stk chips so i am using 150 stk chips. I replaced all diods and now RK 62...


Alot of techs recommend using the higher wattage ICs to replace the stock ones, which is never a good idea since the resistors get stressed. Upgrading to the STK394-160 IC is the only upgrade Hitachi recommends but then the values of the resistors need to be changed since the stock resistors will not work with the upgraded ICs

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Have looked at the STK392-120 chips and the 6.8 ohm resistors. The resistors show no signs of damage, heat or otherwise.Could the problem still be the STK392-120 chips?


I assume you are having convergence issues. Have you checked the voltage to the STKs? If you have correct voltage (+ and -) to the STKs then I would go ahead and replace them. 

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Sony projection tv convergance trouble. changed convergance chips, checked 8 pica fuses, checked 30 resistors all good


Replacing the IC's and the checks you did usually solves the problem.

Double check your wires - especially the R,G and B convergence wires going to the CRT necks - I've had them mislabbeled from the factory b4 and that really throws you off.
Was there any change in symptoms once the IC's were changed and do you have the negative and + supplies feeding the IC's (usually around 30VDC)
If you have the manual, have you tried service menu convergence adjustments?

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There is a good reason as to why you are having problems STKs110s most of the time they are no good even NEW!! Replace them with 180s.

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From my experience most people find out their Convergance IC's were the cause and burned out again because of faulty 6.8 ohm resistors or just plain failure to replace the the resistors when they replaced the IC's. sadly if your planning on spending more money I suggest New IC's use 150's instead of 120's ALSO, make very sure you've changed out all 12 resistors and make sure they are metal film resistors.

Great reference link that I posted pictures on, check out page 3
http://www.techlore.com/forum/thread/16736/Magnavox-51MP392H-17-51-quot--TV-has-double-vision/

Where I got my parts that worked:
Suburban Electronics
http://www.suburban-elect.com/
Manual Library you should find all you need here:
http://www.techlore.com/group/2/list_downloads



What you possibly need:
(2) STK392-120 OR STK392-150 IC
chips
(12) 6.8 Ohm Metal Film resistors
15 watt pencil solder pencil, DO NOT use a high watt iron you will fry the surface mounted item.
good leaded solder, and flux

BTW, if you give up on the TV I'm still looking for a Convergance circuit board yours sounds fried but I would mind trying it out its better then nothing, and ther are a few other people on here looking for parts... so you never know...

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you need to replace both convergence Ics. Post the model number of your set and I will post the correct IC numbers as well as alink where you can get replacements with free instalation instructions. Respond to this same post so I will have access to your symptoms when you post the nodel number.

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Put new ic chips in and the problem still exsists


Many times when the convergence modules go bad, they blow some of the resistors that feed it power. Look for little small low resistance resistors right in the vicinity of the modules.
Hope Ya Fix It.

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most like tes thats all your going to have to replace + the silicon as if you dont thet wil not last as long as they should. Also you may have blow fuseable resistors next to the ICs make sure you check them as well.

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