Repair the machine by the others, in the visual board TDA6101Q, after the machine has not been able to return to normal. XD3service manual download site
 XD3service manual download site
Boot indicator lights, boot melody sound, a sound, no grating. XD3service manual download site
 XD3service manual download site
 XD3service manual download site
 XD3service manual download site
Boot + B voltage 190 v, normal voltage 135 v, is very high. Line driver circuit has been closed since the protection, so the black screen. Primary troubleshooting + B ultra high. In order to avoid excessive + B damage circuit, will she BE short sub, connect + B 60 w bulb false load. Check switch power supply circuit, optical coupling, voltage regulator tube components such as no bad, find SMT IC solder overheating become yellow, repair welding, boot measuring voltage of 135 v + B, normal! Instructions through the repair welding has ruled out a + B fault voltage too high. XD3service manual download site
 XD3service manual download site
Dummy load, to the manager to remove short wires, vibration on line of circuit is normal, but still blank screen. Measuring apparent oscillating between 200-240 V power supply voltage, filament voltage and + 16.5 V / 16.5 V then swing at the same time, the test + B and pipe collector voltage is stable. That line output transformer primary voltage is stable, and what is the cause of the secondary voltage is not stable? XD3service manual download site
 XD3service manual download site
Is the biggest load line output transformer secondary picture tube, no grating and kinescope. So by high accelerating voltage, now see display screen have to beat the trickle of length of white horizontal scan lines (such as the appended drawings), and jumping up and down the irregular change. Scan lines, the corresponding load current is how many, the change of the original voltage is changed. XD3service manual download site
 XD3service manual download site
According to the performance of the horizontal scan lines, may belong to the field circuit malfunction. Replace field scanning IC301 (LA7845) shall be null and void. Testing field excitation input voltage is 5 feet irregularly. The input signal and the release of detection, but it is oscillating excitation signal itself. So ultimately, find IC201 (VDP3130Y B2) 31 feet (VERT), 32 feet (EW), two feet of oscillating voltage is unstable. In a IC201 product, troubleshooting.

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