A Professional TV Repairer
In certain cases when the picture problem is caused by a faulty receiver due to a storm or power surge, your provider can reset it remotely and correct the problem. If the low voltage comes instead from a switching regulated supply and you can’t readily determine the normal output voltage, check for a bad filter capacitor on the feedback winding. A dried up main filter capacitor or other filter capacitor in the low voltage power supply that is producing an out-of-regulation condition until it warms up. Check your standby voltage @ collector of horizontal output transistor, should be approximately 140 volts. Now with the help of this simple UC3842 IC Tester, you can test whether the IC is good or bad.
The real question at this point is whether or not the inside viewing screen was also damaged. If it produces a snowy picture there also, you know there is a problem with that cable. Also Red and Blue Horizontal & Vertical Adjustments work sometimes when TV is first powered then quit when it warms up.
The customer was unhappy that this set was repaired at a component level instead of having the entire board replaced. The volume of business and number of transactions may have a bearing on the number of complaints received by BBB.