I'm considering buying a QYT KT-980 Plus from a fellow ham and while it seems to meet my needs and wants for a simple FM dual band radio giving me an option for higher power if needed, I'd like to be able to turn down the power some to avoid the radio's fan turning on, or reduce the fan's use at least. It has a 2" square fan in the back that sounds like a swarm of angry mosquitos when it runs up to full speed, which it does after several moderately long QSOs / exchanges. I looked up the specs on the fan (model HD-3010H12S) and no wonder it makes noise, it can run at speeds up to 12,000 RPM. One might expect it to sound noisy if it gets up close to full speed, huh? I think the radio is operating normally, it is being used out in the open on a desk so it has good air circulation, it has a near 1:1 SWR so there is minimal reflected power heating up the radio, and the entire external heat sink that takes up the entire underside of the radio seems to be heating up evenly and significantly with this sort of use so I know the transistor has a good thermal connection to the heat sink. It sounds like thermal issues are common with so-called CCRs (cheap Chinese radios). I don't think it's necessarily a poor design if one is aware and prepared to work with it. A smaller, lower-power-rated unit might struggle more to reach its rated power or even put out on low power for extended QSOs, I've read of many cheap, smaller CCRs that burn out finals due to overheating for various reasons and I think I'll be less likely to encounter that with a bigger radio that I will usually run at low power. I may add a larger fan below the unit at some point but I'd rather for now just turn the power down some, as it seems to be able to hit all of the repeaters in my area fairly easily even at low power. We measured with 13.8 volts in at low power the radio is putting out about 40 watts VHF and 20 watts UHF, a little less than advertised but it's said that's common too with CCRs. I wrote the manufacturer and while they've been helpful answering some general technical questions they said they can't send me a schematic due to "policy." I know it may contain proprietary information and so I don't think that's unreasonable, it just makes doing any sort of modding more difficult. The QRZ user VK4GAP created a post about how he replaced a blown final transistor and remarked he might want to adjust or turn down his power later. I don't know how to message a user or "tag" them in a post so if someone could tell me I'd appreciate it but others here may be able to help as well. I know this would be quite a hassle to go through when most users would just keep their QSOs short or rig up a bigger fan. I may play with lowering the power supply voltage slightly, like maybe to 12 volts or a little less. That would likely reduce power but I don't know if it would be good for the radio otherwise to be run undervolted like that, or if doing so would affect the sound quality or something else negatively. I'll include below a hopefully clear hi-res photo of the top of the circuit board. Of course the components I'd need to change may be on the underside of the board, which I can get to but it'd be a hassle and I should only do that after buying the radio. I'd appreciate any suggestions for how I could best trace or infer specifically what components may be involved in lowering output power when the power is set to "low". I'd accept doing something to reduce power in both the high and low power modes as well (if there is one change I could make that would affect both modes, that is), but I'd prefer to just have a lower power low power mode, if that's practical to do as a mod. I suppose there is some sort of voltage regulator that cuts the voltage to the final (or maybe to the final's driver, I don't know) and changing a resistor or something in that circuit may reduce the power. The resistors and other smaller components though are mostly tiny surface mount devices which I'll have to be very careful handling.