How to Replace a Damaged LCD Display Ribbon Data Cable on an HP OfficeJet 6978 Printer

Question:
My HP OfficeJet 6978 printer has a damaged LCD display ribbon data tape. What do you recommend to replace this part?

Answer:

When it comes to the HP OfficeJet 6978 printer, the ribbon data tape (also called an LCD ribbon cable or display FFC cable) connects the printer's mainboard to the LCD control panel. If it's torn, bent, or otherwise damaged, the screen may go blank, flicker, or display incomplete information. Unfortunately, HP does not sell this ribbon cable as a standalone replacement part; it's usually integrated into the entire control panel assembly.

Here's what you can do:

1. Identify the Cable Type:
   Open the printer carefully and locate the ribbon cable leading from the LCD display to the mainboard. Note the pin count (e.g., 20-pin, 24-pin) and pitch width (the distance between the contacts, typically 0.5 mm). These details are critical if you're looking for a compatible generic cable.

2. Replacement Options:

   • OEM Replacement: You may find the full control panel assembly for HP 6978 on eBay or printer parts websites. Search for "HP 6978 control panel assembly" or "OfficeJet Pro 6978 LCD display module."

   • Generic FFC Cable Replacement: If only the cable is damaged (not the connectors), a compatible FFC cable with matching pin count and length may work. While the cable you linked-FFC Cable for Epson EcoTank ET-8550 (4-Pin PF Paper Feed Sensor Cable) (https://bch-youtube-fan-store.myshopify.com/products/ffc-cable-for-epson-ecotank-et-8550-4-pin-pf-paper-feed-sensor-cable-4-pin-cable-et8550)-is designed for Epson printers, it can serve as a reference for identifying similar replacement parts. HP uses different connector configurations, so please measure and confirm specifications before ordering.

3. Installation Tips:

   • Turn off and unplug the printer before working on it.

   • Use an anti-static wrist strap to prevent static damage to internal circuits.

   • Gently release the cable latches (ZIF connectors) on both ends before removing the damaged cable.

   • Insert the new cable evenly and ensure the blue stiffener (if present) faces the correct direction.

4. Common Related Errors:
   A damaged or disconnected ribbon may cause startup issues such as:

   • Error Code 0x6100004a - Indicates a system failure, often linked to hardware communication problems.

   • Error Code 0x610000f6 - Usually related to hardware initialization errors that can occur if the LCD or control board connection is broken.
     If you see these or similar codes, inspect the ribbon connection for continuity and reseat it properly.

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems. Therefore, we're not able to provide remote troubleshooting or repair support. We offer an in-person evaluation and repair service through our local diagnostic facility (https://bchtechnologies.com/printer-repair-service). Because of high demand, repairs are handled on a first-come, first-served basis, so it might take a few weeks before your printer can be serviced. Our services cover both full printer repairs and specific part replacements, with clear step-by-step instructions for customers who prefer self-help. However, we understand that our rates may not always be the most budget-friendly.

For those comfortable with DIY repairs, we highly recommend watching tutorials on YouTube (https://youtube.com/@bchtechnologies). Use the search icon next to "About" on our channel's homepage to find videos on similar printer repair topics. With over nine years of video content, it's the fastest way to locate the guidance you need.

Thank you again for your question and for being part of our community. We appreciate your patience and engagement-it helps us continue improving our content and support for all printer users.