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Message body Emoticons View more Emoticons	Font colour: Default Dark Red Red Orange Brown Yellow Green Olive Cyan Blue Dark Blue Indigo Violet White Black  Font size: Tiny Small Normal Large Huge Close Tags [quote="LJ"][quote="Jujeet"]I have checked all the components as mentioned .Everything is OK.I notice Q802 should turn on to provide +13 at collector of Q802.This is happening without 0.6volt across base and emitter of Q802. Turn on bias occur when you initially on the set.Q806 base must be in high state for Q803 to work. Q806 base is controlled by MPU. I can only scope the horizontal waveform till the base of Q502 , I am using external source. I dont have the 142 volt (Tv is Off state) Best Regards[/quote] That what i mean, base Q803 voltage come from D830, if D830 is a 1.88V zenner and emiter to base Q803 bias is 0.6V - 0.7V, at least there's 2.something at D830 cathode to make Q803 work.[/quote]
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