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Related Manuals for Roadstar LCD-8412K
Summary of Contents for Roadstar LCD-8412K
- Page 1 LCD-8412K/S...
- Page 2 Repairing precedures for no sound, no picture and no light. Check whether power indicator lights in red. Press POWER to check whether 0~5V 5~0V change available on CPU ○, pin or not. Check whether Check whether external circuit supply for key input pin normal or not.
- Page 3 Repairing procedures for Inferior color Check whether output voltage from ○, ○, LA76810○, is normal or not. Whether LA76810 ○, ○, pins are short-circuited or not and whether ○, pin is normal or not. Check whether loop of IR3Y26 ○, ○, ○, ○,...
- Page 4 WITH Sound, with light and black screen Check whether power supply LA76810 ○, ○, pins normal or not. Check power supply. ○, Check whether LA76810○, ○, pins are normal or not. Check whether line field pulse of CPU is normal or not. Check LA76810line field Whether...
- Page 5 Repairing Procedures for line field synchronization Check whether +5V +8Vpoweer supply of LA76810 is normal or not. Repair power supply. Check whether peripheral circuit of LA76810 pin is normal or not. Change 1u 333 capacitance Check peripheral circuit of 4001 IC Pcircuit for treatment of line field synchronization).
- Page 6 ,repairing procedures for white light. Test whether the switch power supply +5V +8V and –15V are normal or not. Whether repair power supply and subsequent circuit is short-circuited overloaded. Check the loop of power supply. Test whether IR3Y26 +5V and +7.5 power supply is normal or not.
- Page 7 NO SIGNAL. Test whether +40V is normal or not. Check 40V loop. Test whether wave band switch voltage is available with CPU ○, ○, ○, pin. Test pin VT output voltage is normal or not. Change CPU. Check whether AGC voltage for +5V power supply of TV tuner is normal or not.
- Page 8 Can not store program. Check whether 32V-tuning voltage is normal or not. Repair tuning loop. Check whether AFT circuit is normal or not. Repair AFT circuit. Change TV tuner and sound surface...
- Page 9 With picture, no or low sound and distortion Test whether loudspeaker is open circuited or not. Change loudspeaker. Test whether power amplifier 386 is broken or not. Test whether power amplifier broken or not. ○, Check whether LA76810○, pins are normal or not. Check whether LA76810 ○,...
- Page 10 Dark light Check whether contrast Check whether power and bright are adjusted supply of each circuit to minimum or not. is normal or not. Check supply power circuit. Set analog quantity Adjust potentiometer of TV at standard. main board whether there is change or not.
- Page 11 with picture, with sound, no character or inferior color. Check CPU 32K crystal oscillation. Change crystal oscillation. Check whether pulse input of line field synchronization is normal or not. Check line field synchronization circuit. Check whether CPU ○, ○, Inferior LA76810 ○, ○, character...
- Page 12 AV no picture or no sound. Check whether connects wire normal or not. Change AV connect wire Check input socket. Change input socket. Check the loop of audio and LA76810○, pin, and the loop of video and LA76810○, pin. Change LA76810...
- Page 13 No flip vertical/horizontal function Press keys on remote control. Test CPU ○, ○, pins to check 1 Whether 0 5V or 5 0V change is available on P15)P16) pinR 2 Whether 0 5V or ○, ○, 5 0V change is available on pins for picture mode selection.
- Page 14 IR C5V KEY GND TDQ-3CV1 ANT1 IC11 REMOTE C117 R116 R117 R154 R156 R155 POWER +12V R157 R158 R159 R160 C118 100uF LA76810 R118 R146 10uF 15uH C147 TV/AV 22uF 10uF 10uF C119 R119 C148 R120 AUDIO SIF.IN +33V C120 R147 R121 C149...
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