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[smilesdavis]

anyone got the 15" blueberry flat screen that went with the PMG3b/w working with the S-VIDEO or Composite input in standalone?

well thats how i wanted to use it for watching some old VHS off the VCR but in S-VIDEO i can only get a black screen with some lines reminiscent of video tape on it.

is there any documentation for the monitor that goes a bit in depth (the service manual did nothing for me).

http://www.applerepairmanuals.com/the_manuals_are_in_here/Apple_Studio_Display_LCD.pdf

Connectors and cables
• Input
—15-pin D-sub for RGB video
—4-pin DIN for S-video
—Three 4-pin DIN connectors for Apple
Desktop Bus
—RCA-type connector for composite video
—Two RCA-type connectors for audio (left, right)
—65mm DC connector for DC input
• Output
—Mini-stereo connector for audio

https://support.apple.com/en-us/112284

Video In/Out: S-video and composite inputs

and this is the LCD by itself:

https://www.beyondinfinite.com/lcd/Library/LG-Philips/LM151X1.pdf

[robespierre]

You may need a time base corrector (TBC) if the monitor is not designed with that ability itself.

[smilesdavis]

1. Why 75 Ω really matters for S‑Video (Luma & Chroma Y/C)
S‑Video isn't just another DIN with any 4‑pin cable. The display internally terminates the Luma and Chroma lines with 75 Ω resistances to achieve proper sync and signal amplitude. When those lines aren't both the correct 75 Ω, reflections kill synchronization and video fails to decode

Using 50 Ω or audio‐spec jacketed cable (e.g. repurposed twin RCA or servo extenders) puts the display in a situation it wasn't designed for: no lock, no sync, snow

That’s exactly what your symptoms (black screen, shimmering white artifacts) suggest.

while i dont have snow but a black display with "some lines reminiscent of analog tape" im now shopping for this 75 ohm cable

update: i connected my Apple //c+ via composite to the blueberry and im getting a flatline. it works on the Apple //c monitor. so there are issues. because this should work. when i open up the on screen display it at first displays ghost mirrow images of the osd then flatlines too.

bad caps?

[robespierre]

Frankly, the text you quoted about 75Ω is horseshit. Reflections don't make any visible difference on short cables.

If the OSD in the monitor itself is bad, then there is definitely a problem internally.

[smilesdavis]

bad caps i will be i reckon, will take apart soon. haven't found a replacement as of yet in case the lcd is beyond repair (cap goo)