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Re: STK392-110 Upgrade to STK392-150
Hi and welcome to FixYa,
Offhand, should be none. The resistor should not be upgraded unlike the STKs. Technically, the ohmage/resistance values should still be the same. If you change to a higher wattage, then, what is improved is the heating capacity, meaning it will be more tolerant to the heat but the resistance value should still be the same.
The STK upgrade is actually more to improved heat handling/transfer capacity of the STK ICs. The technically correct description is high power used in low capacity hence will not heat as much as the originally installed.
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you also need to check and replace low value resistors in that circiut.they are all 1 watt,usually they get discolored when stressed.R842 2.2 ohm,R854 and R846 1.5 ohm,R850 2.2 ohm,R858 3.3 ohm,R862 1.8 ohm.they must be the exact value available in MD from surburban electronics.please note stk392-110 upgrade to stk392-150 for future referance.ONCE AGAIN CHECK ALL LOW VALUE RESISTORS
The problem is that the ICs may have been blown because the resistors were bad. Just as a double check before you replace anything else. Please confirm that the STKs are STK392-110. Also, replaceing them with STK392-150 is a valid upgrade, I'm not sure about the 180s, but I'll check. Both the STKs and the resistors need to be changed at the same time.
The hour glass view you reported: Was the bowing on the top and bottom or on the sides?
Yes you need to replace both convergence ICs. They are both STK392-150 you will also need to replace the 6 feed resistors. You will need ( two ) 1.8 ohm 1watt metal film resistors.
( one) 3.3 ohm 1watt, ( 0ne) 2.7 ohm 1watt, ( one) 4.7 ohm 1 watt, and ( one ) 2.2 ohm 1watt . The resistors are all 1 watt metal film resistors. You can get replacement ICs and resistors at the following link with free instalation instructions with pictures, plus free tech support. http://servicemanuals.vstore.ca/
Check the resistors near the Ics especially the 3.9 ohm 1 watt resistors often one or two will be open then when you install the higher wattage Ics which run cooler you can actually wipe out all the convergence resistors which are 3.9 2.7 and 4.7 ohm 1 watt resistors