First detected by conventional end-stage video amplifier stage supply voltage is 200V normal (such failure is the final stage of the video amplifier multi-stage filter capacitor failure, resulting in a decrease in supply 180V). Check the last stage video amplifier stage R, G, B three color using IC351, IC352, IC353 three blocks, their models are TDA6111Q (see Figure 1), which measured 1 foot voltages are 0V, normal is about 3V . Cis-line investigation, Figure 1 N access point by R387 12V, via D354 grounded. D354 transistor similar shape and C1815, the model appears to be 81A8KEO, shape shown in Figure 2, the analysis D354 is a resistor and a Zener diode (see Figure 3), remove the test D354 R, A resistance value of the feet, its pros and cons to both of 200Ω, measure A, K feet resistor values​​, both positive and negative resistance is 0Ω, indicating that it has a breakdown. Try 200Ω resistor connected R, A feet, with 2. 7V zener diodes connected to A, K feet, commissioning the machine back to normal.TmWservice manual download site