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Symptom solution The tuners are not working. Video inputs are good.At U25501-4 , the 33Volts in is R14629,CR shorted. Found Cr14601 shorted and R14629 470 ohm increased in value. Replaced Replace Cr14601 MMC102A 14601 Tuning System both. and R14629 470 Video would slowly washout and go to black after two minutes of operation. Servicer noted that tapping on tuner caused video to flash. Inspection of tuner found loose MMC101 L32606, 7, & soldering at coils L32606, L32607, and L32608. Resoldering coils restored tuner and CE 8 Tuning System video operation. Resolder coils The unit did not have any tuning. On checking tuner found there was no 33 volts going to the tuner. Looking at the 33 volt power supply we found that r14629 was open and we Replace r14629 had 200 ohm to ground. Checking the tuner c25207 was broken and c25215 check c25215 and c25207. MM101 r14629 Tuning System short
Chassis Part Symbol Defective Circuit
DTV306G C Pip Tuner DTV306G C pip tuner
No NTSC Tuner, replaced the caps and the diodes in the dm1 power supply and the DM1, unit gets a blurp of sound then the screen that says weak signal, this is exactly what the original DM1 did. Also does not get the pip window or pip tuner, Unplugged the Replace Pip Tuning System pip tuner and the NTSC tuner in the DM1 worked again Tuner replaced pip tuner
tuner
Cycles, All error codes 64 , found that the pip tuner was loading the clock & data lines.