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You can try replacing the resistors. They are available using part number: ERDS1FJ100 from tritronicsinc.com for $1.10 each. Typically though, the reason for the silence is a defective output amp-pac. This too can be purchased from tritronicsinc.com using part number: RSN3305-P for $65.73. This is the amp for the front speakers. The rear and center speaker5s use part number: SVI3205B which is listed as no longer available.
If the resistors were blown, the power amp which is either transistors or an amplifier package has been shorted out. The resistors are very low resistance, and used really as slow blowing fuse. The value is probably a fraction of an ohm (eg. point two ohms)
I have the same problem, but it is open. The color code Brown - Green - Brown - Gold. If it is a resistor, the value must be 150 ohms +/- 5%. To confirm the value, I open the working trimmer and remove one leg from the circuit and measure resistance. The meter reads only 4 ohms. Therefore, I think it is an inductor (150uH +/-5%), not resistor.
long time since i worked on one of those chassis but if i remember right there both 250k ohm 1/2 Watt carbon in series
but its more common for them to go open circuit if there burned you better check out the rest of the circuit around the LOPT stage
There is a service bulletin for this problem:
No Horizontal Deflection and RL06 is Burning. FOUND CL05 OPEN
RL06 = 680 ohms 2 watt resistor
CL05 = .39 UF 250 volt poly capacitor