Main > Monitor/Video Forum
Sony PVM-2130QM - Color RED bleeds and is blurry.
arcadeswede:
--- Quote from: buttersoft on August 07, 2020, 07:47:50 am ---
--- Quote from: arcadeswede on August 07, 2020, 06:20:11 am ---Could this also be a symptom of just a tired monitor overall even though blue and green looks ok? I haven’t seen this issue before with just one color so I’m really scratching my head.
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If you mean tired tube, there, then yes, it can be a symptom. But the tubes Sony used were great quality, so it's far more likely to be voltage-related as above.
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Yes, that’s what I meant.
Ok, good to know because I believe so too I mean, blue and green looks good. If the tube is worn out. Wouldn’t green and blue look equally bad?
I’ll order some resistor asap and start from there. I’ll keep you guys posted.
Zebidee:
I think your tube/cathodes are good. The colours are still strong.
Those resistors do age, the values are a little out and replacing them is probably a good thing. I'd expect them to be a lot further out if actually failing, but maybe you're just catching it early.
If it is those transistors failing somehow, voltages at the marked points should be out. So yeah check those points and maybe add some transistors to your order if you get any weird measurements.
arcadeswede:
I did some measurments. According to the service manual, there should be some values to check around the transistors B,E and C. So I did. Here's my result:
Something seems strange around the Emitter of Q707 (RED), only 109V around the diode. I measured the other BLUE and GREEN diode D701 and D704 and their value was not that low, almost the same. I gotta split so I can't measure more right now or dig into it.
Maybe you guys have a clue of what's going on?
Bad diode (D704)?
EDIT: Looking at the image. I might have swapped the values on Base and Emitter for Q707. Or maybe not? I need to check my notes again back home.
Zebidee:
--- Quote from: arcadeswede on August 07, 2020, 11:17:50 am ---Maybe you guys have a clue of what's going on?
Bad diode (D704)?
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Maybe - you'll need to remove the diode to test it.
Worth checking your B+ - if that is low, might explain why other voltages here are a bit low too.
arcadeswede:
I measures the B+ voltage going into the D-board. Serive manual says 135V, I measured 136.7V.
A little high but shouldn’t affect my problem enough to have all my values that low on the neckboard, right?