PVM-14M4

Sony's PVM-14M4U Color Production SMPTE-C Monitor is a convenient professional video option. This 14-inch Trinitron color production monitor features SMPTE-C phosphors for accurate color matching, knob-type controls for easy setup, and a menu-driven CPU with on-screen display (OSD). The monitor accepts NTSC, NTSC (4.43), PAL, SECAM in Composite, Y/C and RGB, and Y/R-Y/B-Y formats. SDI with the optional BKM-101C card, call for details on the SDI card.

This set features the HR Trinitron and has a resolution of 800TV lines. Good all-around PVM for sitting on your desk or other space-saving applications. Not the most reliable PVM series but common repairs are well documented. There were several board revisions, getting a later model-year will ensure a more reliable experience. Sony changed the spec of several commonly failing capacitors.

Common Repairs

Power Supply Failure:

Try testing with known good PSU if available. If not available test PSU outputs with load to see if voltage is within spec printed below connector. Regulators commonly fail. Cap failure less likely but still possible.

3 RGB lines at top of screen:

Check if underscanning (either with toggle swith or due to V-Height). If not underscanning then there is a deflection capacitor failure. Replace C-572 and C-584 on A Board. There is an old reccomendation to adjust the V-BLNK (V-Blanking) value in the serivce menu to 'push' the lines up off of the screen but this is not reccomended and only a temporary fix at best. It can further accelerate the death of the aforementioned capcitors and cause damage to other components. More information here: RetroTech on YouTube

Check R598 (33k SMD). This resistor may fail and go open circuit causing vertical collapse

Power on, tally light, no response from buttons, no picture displayed:

See this guide which addresses the issue.

Wide Image/Pincushion adjustments have no affect

Remove L509.

If image shrinks and pincushion fault remains:

• Check Q503 (Pin-Out Transistor - 2SD1134-C) - can be replaced with TIP41C
• Check IC509 (Pin-Comparator - LM358DR) - ensure voltage on pin 8, damage to pads/via on C579 can cause this. This IC is annoying to replace as it is beneath/between a bunch of caps and heatsinks
• Check Q501 (HOT - 2SD1878) - will most likely have more issues than just pincushion problems if this has failed

If the image stays the same:

• Check D502 and D512 (Pin Damper Diodes - UF5408) - if these are UF5406 change to the higher voltage UF5408 per the service bulletin
• Check C514 (0.01 uF 1.5 kV PP cap) - if this is the orignal 630 V cap replace with a higher voltage rated 1.5 kV (or higher) part per the service bulletin
• Check C2510

Technical Bulletins

Related Documents

Sources

https://crtdatabase.com/ (CC BY-SA 4.0)