Mitsubishi Electric · GOT1000Obsolete / discontinued
GT1155-QSBD Repair
Mitsubishi GOT1000 GT1155 operator terminal (GT1155-QSBD). Backlight failure dominates on 24/7-duty units; the GOT1000 line is discontinued with OEM service ending 2027 — repair continues after the cutoff.
Known failures on the GT1155-QSBD
- ▸Dark screen / backlight failure
- ▸Touch dead spots
- ▸No power
- ▸Boot 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 GT1155-QSBD 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 GT1155-QSBD differs from the rest of the GOT1000 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 GT1155-QSBD fails — and what we do about it
The GOT1000 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
- Screen goes dark while the terminal continues running normally.
- Why it happens
- Backlight assemblies wear out with hours in service. On a GOT the underlying display and video path typically remain fine, which is why a faint visible image is such a reliable diagnostic.
- What we do
- The backlight assembly and drive circuitry are repaired or replaced and brightness verified across the panel.
Touch panel failure
- What you see
- Dead or inaccurate touch response, often localised to specific areas.
- Why it happens
- Touch layer wear concentrated where operators press repeatedly, plus fatigue in the flex connection.
- What we do
- The touch panel is replaced and calibration checked across the full screen.
Repair or replace a GT1155-QSBD?
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 Mitsubishi GOT 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.
Mitsubishi GOT Repair — full details →Frequently asked questions
Can the GT1155-QSBD be repaired?
Yes — dark screen / backlight failure, touch dead spots, no power are the failures we commonly repair on the GOT1000 platform. The flat price is $449 including parts, testing, and the 24-month warranty.
How long does a GT1155-QSBD 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