Pro-face · AGP3000 series
AGP3400-T1-D24 Repair
Pro-face AGP3400 7.5" touchscreen (AGP3400-T1-D24). CCFL backlight failure (screen dark, graphics faintly visible with a flashlight) and digitizer wear are the classic faults — repaired flat-price with the project preserved.
Known failures on the AGP3400-T1-D24
- ▸Dark screen — backlight failure
- ▸Touch dead spots or drift
- ▸No power
- ▸Comm faults
Ship your unit to
USPS
Control Board Lab
PO Box 120241
Arlington, TX 76012
UPS / FedEx
Control Board Lab
1009 Oakwood Ln # 120241
Arlington, TX 76012
Write your RMA number on the outside of the box and include it on a note inside. Units over 50 lb (large VFDs, spindle drives, industrial PCs in enclosures) ship by freight — contact us before ordering and we will arrange dock-to-dock shipping.
Check these before you ship
Some of these will tell you the AGP3400-T1-D24 is fine and the fault is elsewhere — worth ten minutes before you pay to ship it.
- □Confirm the supply feeding the terminal is actually delivering its rated voltage under load — a failing panel supply mimics a dead HMI exactly.
- □Shine a bright light at an angle across a dark screen. If you can make out the application faintly, the LCD is alive and you have a backlight fault, which is a cheaper and faster repair.
- □If the unit boots but the touch is wrong only in one region, note where. Localized dead zones point at digitizer wear; whole-screen drift more often points at the controller.
- □Note the exact text of any boot or fatal error. The code narrows the fault far faster than "it will not start".
Not your exact model?
Search the catalog or send us the number on your unit's label — we service far more than the catalog shows.
How the AGP3400-T1-D24 differs from the rest of the AGP3000 series range
These share an electronics platform and fail in the same ways, but they are not interchangeable — check the number on your unit's label against this list before you ship, and before you buy a replacement.
Why a AGP3400-T1-D24 fails — and what we do about it
The AGP3000 series shares its electronics across the family, so these are the faults we see on this part number again and again.
Backlight failure
- What you see
- Dark screen, with the application faintly visible if you shine a light at it.
- Why it happens
- The backlight and the circuit driving it wear out with running hours. Because these terminals often run continuously for years, backlight failure is one of the most common faults we see on them.
- What we do
- The backlight assembly and its drive circuitry are repaired or replaced and brightness verified across the panel.
Touch panel degradation
- What you see
- Touch that misses, drifts, or stops responding in specific areas.
- Why it happens
- The resistive touch layer wears at high-use points, and the flex connection can fatigue with thermal cycling.
- What we do
- The touch panel is replaced and calibration verified across the whole surface.
Repair or replace a AGP3400-T1-D24?
Operator terminals are the clearest repair-over-replace case in a plant. Much of the installed base is discontinued with no drop-in successor, so replacing means specifying new hardware, re-developing or converting the application, re-testing it against live machinery, and retraining operators on a screen that behaves differently. The repaired terminal drops back into the same panel cutout running the same application. Even where a successor exists, the migration engineering usually costs several times the repair.
Full technical detail for this repair
The Pro-face HMI service page covers the complete bench sequence — how the unit is tested, what gets replaced and how it is proven before it ships back — along with the rest of the family we service.
Pro-face HMI Repair — full details →Frequently asked questions
Can the AGP3400-T1-D24 be repaired?
Yes — dark screen — backlight failure, touch dead spots or drift, no power are the failures we commonly repair on the AGP3000 series platform. The flat price is $449 including parts, testing, and the 24-month warranty.
How long does a AGP3400-T1-D24 repair take?
Standard bench time is 3–5 business days once the unit arrives. Rush service (+$149) moves it to 1–2 business days, and emergency same/next-day attempts are available — contact us first.
How do I send it in?
Start the repair online to get an RMA number instantly, pack the unit well with the RMA on the box, and ship it to our Dallas–Fort Worth lab with any carrier. Full packing guidance is on the mail-in instructions page.
Machine down? Let's get it back up.
Start a repair online in two minutes, or send us the part number for a free technician review.
The Fixed-or-Free Guarantee: if we can't repair it, you don't pay for the repair.
Call (817) 799-7332 · 📱 Text us a photo of your unit · Email repairs@controlboardlab.com