I agree, probably in the horz circuit. And yes, they should be repaired. No need to replace an entire circuit board, that a little solder and a hot iron will restore. The horiz ckt is the one with the large transformer(ID#5445)with a large red wire at the top, going to the picture tube(located at the rear of the circuit board). Close to the h-v transf will be the horz output transistor(ID#7560), about the size of a postage stamp, but much thicker, that is clamped to the metal shield. The horizontal driver transformer(ID#5461), located in front of the high voltage transformer. The legs of horz dvr tnsf 5461 is the part that usually gets defective connections. There are 4 legs. It's best to remove the old solder and apply fresh solder. Of course you always examine the circuit trace for any indications of any other bad connections, while you have the bottom of the ckt bd exposed. good luck, pw

yes slowing the speed will most certainly affect the whole house cooling and heating. But it may be an easier and less costly option to try first before going to the mess and expense of adding in retrofit dampers. If you haven't done so already, see if some of your individual room vents can be closed off somewhat. Closing them on the lower level may help force more cooling upstairs. Is there a problem with the heating being uneven, or just when cooling? If it is really only with the cooling, then the solar heat gain from upstairs windows and skylights is probably what is the source of the problem. Additional window coverings can make a difference to reduce solar gain, especially on east/west glass.

My AC Isn't Providing Enough Cooling. Portable air conditioners are ideal for cooling small areas, such as bedrooms or living rooms, or for providing supplemental cooling in places central AC systems can't reach. Because they're small units, the two primary reasons for inadequate cooling are incorrect sizing and extreme ambient temperatures. The size of an air conditioner refers to its cooling power, not its physical proportions. Portable ACs are sized according to their BTU ratings, and if your portable AC has the wrong BTU rating for the size of the room you're trying to cool, its efficiency will be affected. A unit with too many BUTs will cause the unit to cycle off too quickly, while a unit with too few won't be powerful enough to affect the ambient temperature. To find out whether your portable air conditioner is the right size for the room it's in, measure the length and width of the room. If your room is oddly shaped, try breaking it up into smaller shapes like squares and triangles. Calculate the area of a triangle my multiplying the base by the height and dividing in two. Once you've calculated the area, consult our portable air conditioner sizing guide to see what size air conditioner will work best in that space. If you're on the cusp of two different sizes, always choose the bigger one. It's okay to have a little more BTU than you need, just so long as it's close to the correct size. On the other hand, if the ambient temperature is too high, it can also cause insufficient cooling. As portable AC units release cool air out into the room, they vent hot air from the compressor outside. This constant venting causes a pressure imbalance that pulls in warm air from the other areas, including adjoining rooms and the outdoors. Normally, if the room is properly sealed and all the doors and windows are closed, the air coming is never enough to overwhelm the portable AC unit. If there's a leak, or if the outside temperature is extremely high, the air conditioner may not be able to generate enough cold air to cool the room. Sunlight can also heat a room faster than your portable air conditioner can cool it. If temperature keeps rising, check for leaks and close the blinds. It may be enough to swing things the other way.

It's most likly to be restricted airflow. Cause can range from dirty filter,dirty evap coil,collapsed return to blower not moving suffecent air. Did ambient outdoor tempature in your location drop recently? While waiting for tech to return I suggest raising temp setting to highest point at t-stat and setting fan to ON/CONT. After 6 or more hours set temp for normal operation but leave fan set ON/CONT. Carfully test volume of air flow at the start and each hour or two.