Fixing the JVC BM-H2000PN & BM-H1400PN

Horizontal Line at Top of Screen / No Display Issue

A customer sent in two JVC broadcast monitors a while back for repair :
a BM-H2000PN (20-inch) and a BM-H1400PN (14-inch). 

Both monitors were clearly faulty:

• 20-inch: A persistent horizontal line at the top of the screen

• 14-inch: No display at all

At first glance, neither of them showed any obvious faults internally. Boards checked out fine, voltages looked normal, and nothing appeared damaged or out of spec. 

This one had me scratching my head for a while. I've seen a few similar cases on some online forums and none had a fix.

The Breakthrough: Modular Design + NOS Unit

Recently, I managed to get my hands on a NOS BM-H2000PN. Thanks to JVC’s modular design, I was able to start swapping boards between the working unit and the faulty ones. They aren't modular like Sony BVMs, and swapping boards was no where as easy, but it was enough to figure out where the problem is.

The issue is not in the deflection board, power supply, or neck board.

Root Cause: Corrupt EEPROM on the Motherboard

The fault is caused by a corrupted EEPROM:

• IC103 on the motherboard

• Chip model: AT24C02

This IC stores video and deflection data as far as I can tell. When its contents become corrupted, the monitor can exhibit symptoms such as:

• Intermittent display issues. Early symptoms will have the monitor show a display or a white line after warm-up, or image would come and go randomly

• A horizontal line at the top of the screen

• No raster / no display at all
  

If you’re dealing with no display, make sure you confirm high voltage and neck glow first. This ensures the problem isn’t elsewhere before proceeding.

Interestingly, the service manual actually includes a procedure for replacing this IC, which could suggest that this was a known or expected failure point.

The Fix

The solution is straightforward:

1. Access the motherboard

   • It sits directly behind the control buttons

   • There’s an easy-access panel on the underside of the monitor for 20 inch models. (Unfortunately for the 14 inch models you'll need to almost fully disassemble the monitor, remove boards inside and the bottom base panel).

   • Place the monitor face-down, remove the panel, and the entire board slides out with a bit of effort. Take note of which direction the ribbon cables are connected. (Note here: If you end up with a menu displaying after finishing the fix but no display from any inputs, recheck the ribbon cables are inserted correctly).

2. Remove IC103 (AT24C02)

   • Desolder the chip from the motherboard

3. Reprogram the EEPROM

   • Write the provided HEX file directly over the existing data

   • No erase is required

   • Most standard EEPROM programmers will work

4. Reinstall the chip

   • Ideally, replace it with a brand-new AT24C02 for long-term reliability. Installing a chip socket would also be a good idea in case it goes bad again

The HEX file I used was dumped directly from the NOS BM-H2000PN, and it completely resolved the issue on the 20-inch unit.

Results on the 14-Inch Model

I tested the same HEX file on the BM-H1400PN, which previously had no display at all. Surprisingly, it worked perfectly. The monitor came back with a clean, stable image.

That said, it may be best practice to:

• Dump a known-good 14-inch EEPROM and use that instead

• Even though the 20-inch data works fine, the stored geometry and deflection parameters are technically model-specific

Final Notes

If you’re repairing a JVC BM-H2000PN or BM-H1400PN and you encounter:

• A horizontal line at the top of the screen

• No display despite normal HV and neck glow

Check IC103 first.
This is an easy fix once identified, and JVC’s modular design makes access painless compared to many other broadcast CRTs.

The HEX file can be downloaded from the link below:

JVC BM-H2000PN IC103 HEX File

This same fix theoretically should apply to the American variants of the same monitors, the BM-H1310SU and BM-H1900SU. If you managed to fix one of these using this guide please let me know in the comments.

These tubes are high res 750 lines, and have a stunning sharp display with a lovely shadow mask. Was really glad we were able to fix both monitors for the customer. Hopefully the info above helps you out as well if you are reading this. 

Jan 2026 update: We had one 14 inch come in that wouldn't sync in RGB. We managed to fix the issue by swapping some bad caps in deflection. Sync came back, however RGB wouldn't display in color unless you switched channels multiple times really fast. Instinctly felt like another corrupt IC, and sure enough the problem was fixed by re-flashing the IC.