Response from Jonathan: First off, let me say that we don’t have a lot of experience working on Nanao monitors. Jomac (http://www.jomac.net.au/mon.htm) from Australia is the expert when it comes to Nanao. I remember him saying that replacing C433 (Capacitor 10uf 50v), R433 (Resistor 2.2K 1/4w) and R436 (Resistor 15K 1/4w) should pretty much solve most vertical deflection problems with this monitor. You might try that before replacing the chip. Also, you might try contacting Jomac if you continue to have problems. Hope that helps.