Shutdown, turned over a period of time, the fault is still. Suspected element existed phenomenon of poor thermal stability. Detection of + 5 V, + 8 V, + 3.3 V power supply are normal. After trying to replace DRAM failure remains the same. Decompression chip SPCA702A fingered, feel fever, try alcohol sponge for its fault slightly improved after cooling, replace SPCA702A and troubleshooting.QvLservice manual download site