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Sony PVM-2130QM - Color RED bleeds and is blurry.
Zebidee:
Always best to make B+ as close to spec if possible
How about that diode? you can just lift a leg to test it too, but sometimes easier to just remove the whole thing rather than bending it up
arcadeswede:
--- Quote from: Zebidee on August 10, 2020, 06:01:50 am ---Always best to make B+ as close to spec if possible
How about that diode? you can just lift a leg to test it too, but sometimes easier to just remove the whole thing rather than bending it up
--- End quote ---
The service manual says to adjust +B to 140V (+-0.5V) on board FA, but it's hard to get to a testpoint. Could I instead adjust my 136.7V on the D-board I measured earlier to 135V? Or should I just rely on the actuall test point on board FA (140V)?
I'm going for the diode next. I had a few minutes to spare for checking the voltages. Will check it and follow up later.
Zebidee:
Everything else relies on B+ being right so sorry but I say test that. Schematic says there is a pot so use it to adjust as appropriate.
arcadeswede:
Ok, +B is now adjusted to 140V spot on.
Took out the diode and measured it. The diode is 0.593V one way, and OL the other. Which is good as far as I know.
I will continue to measure and poke around to see if I can find something else that is obvious.
arcadeswede:
Alright, did some more measurments and found a couple of mistakes from my part.
The diode that showed bad values before was not D707, it was D712, that was my fault looking at the neckboard the wrong way. But that was the diode I removed when I tested it so it should be fine.
Just out of curiosity I swapped the BLUE Q703 transistor with the RED Q707 but no change. RED still looks blurry.
Here's my measurment values now. Voltage have been going down a bit and the 200V line is now 220V. Don't really know what's going on with my values.