Hi!
This TV also had the dubious honour of being the subject of the worst soldering job ever thread, but I thought I'd start another thread for some troubleshooting I need to do unrelated to the shocking repair job discussed in that topic.
I've got the PSU working when isolated. Jumpering ps_on and with a resistor between std5v and vs_on I get correct voltages including Vs at 205V.
With everything connected, everything fires up except Vs which stays at 0V, and vs_on which also remains at 0V through the whole start-up sequence. This happens also with any combination of X-main and Y-main connected/disconnected.
I've removed the main AV board and jumpered the logic board for test patterns. Is it supposed to give the vs_on signal itself in this state? Either way I have tried it with forcing vs_on with the resistor and without. With logic board connected without forcing it, vs_on remains at 0V. With forcing it, it briefly rises to about 1.7V and then drops to 0.7V and Vs spikes to 100V or so and then gradually drops down.
The two LEDs on the logic board light up and stay constantly lit.
My guess is I need a new logic board. What are your thoughts?
This TV also had the dubious honour of being the subject of the worst soldering job ever thread, but I thought I'd start another thread for some troubleshooting I need to do unrelated to the shocking repair job discussed in that topic.
I've got the PSU working when isolated. Jumpering ps_on and with a resistor between std5v and vs_on I get correct voltages including Vs at 205V.
With everything connected, everything fires up except Vs which stays at 0V, and vs_on which also remains at 0V through the whole start-up sequence. This happens also with any combination of X-main and Y-main connected/disconnected.
I've removed the main AV board and jumpered the logic board for test patterns. Is it supposed to give the vs_on signal itself in this state? Either way I have tried it with forcing vs_on with the resistor and without. With logic board connected without forcing it, vs_on remains at 0V. With forcing it, it briefly rises to about 1.7V and then drops to 0.7V and Vs spikes to 100V or so and then gradually drops down.
The two LEDs on the logic board light up and stay constantly lit.
My guess is I need a new logic board. What are your thoughts?
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