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File name THOMSON ICC17 SM.pdf

DEFLECTION CIRCUIT CHECK START TROUBLESHOOTING TV starts for a moment with EHT (at least 1s) and attempts 3 starts. Horizontal deflection repair routine ERROR CODE 28 Signal by LED. Vertical deflection repair routine Short circuit TL71?s Collector to GROUND. Check safety circuit components TL71,72, etc. TV now OK ? Vertical deflection repair routine Open circuit DL74 Open circuit TL71 TV now OK ? Check for open circuit horizontal deflection stage components. Horizontal deflection repair routine Check BCL components CL09. DL09, CL08 TL02,TL59 Check DL75 www.rtv-horvat-dj.hr DEFLECTION CIRCUIT CHECK HORIZONTAL DEFLECTION REPAIR ROUTINE Open circuit pin 8 IP95 or short pin 4 of IP95 to GND Check the U-TIMER ~ 9v USYS ~ 70v / 5VUP ~ 5v +UA ~ 12v / U-VIDEO ~ 100v Connect pin 8 or remove short on pin 4 of IP95. Short circuit TL34 B/E. Short TL71 Col. to GND. Check for H_Drive on RV18, breifly visiable. Yes OK? No Open circuit either pin 10 of the DST or JL60. Check power supply voltage as again. TV now OK ? No IV01 repair routine TV now OK ? No No deflection problem! refer to power supply Yes Yes Check H drive pulse on pin1 of LL32. Check TL34 DL21, CL21 CL24, DST TV now OK ? No Check H_Drive components RL35, RL36,TL31,TL32,TL33 Yes Check Short TL34 B/E. Check retrace pulse on the collector TL34 (probe 100:1) Go to 1 www.rtv-horvat-dj.hr DEFLECTION CIRCUIT CHECK 1 OK? No Check for short circuit DST supply lines 5Vdst, Vsupply, Vretrace check TL34, LL32 Check Modulator components Yes Check DST output voltages these should be least at 50% of the nominal value. Check 5VON, VSUPPLY,VRETRACE OK? No Check the following, ZL11/13 ZL14, DL11/13/14, TL14 Yes Check the Line Flyback pulse (LFB) during start-up. Briefly visible? No OK? Check flyback voltage on pin 8 of the DST. Check DL09, DL19, DV09 Yes Vertical deflection repair routine www.rtv-horvat-dj.hr DEFLECTION CIRCUIT CHECK VERTICAL DEFLECTION STAGE REPAIR ROUTINE V supply and V retrace was OK or >50% during start? No Check the following items:RL11/13, ZL11/13, DL11/13. Yes Vertival retrace visible on pin 7 IF01 during start ? OK ? No Check vertical guard signal on pin 34 of IV01, pulse with U>4V during retrace and <4V during scan visible. Yes Check Vetical Deflection IC pin resistance with TV "OFF" V supply (pin 3) > 5KOhm V retrace (pin 6) > 50KOhm Output A (pin 7) ~ 5,7KOhm Output B (pin 4) ~ 5,7KOhm OK ? Yes No OK ? No Change IF01 Yes Check pin 1 and 2 of IF01 vertical amplifier during start-up. At pin 1 approx. 3V DC and a visible sawtooth signal, on pin 2 approx. 3V DC. IV01 repair routine No OK ? Yes NO vertical problem !! Yes www.rtv-horvat-dj.hr DEFLECTION CIRCUIT CHECK IV 01 REPAIR ROUTINE Check RV01, CV03, RC02, CC03. Also check for short circuits on IV01 supply pins? No Is +8v present on pins 23 & 53 of IV01 at switch "On" ? Yes Yes Power supply or µP problem +5V on pin 55 & 6,8V on pin 19 IV01 No Check CC01,