Member Avatar for mandeep_3

i have a kiosak in my office.there is the display problem in it. showing no signal.but cpu fan and smps fan is working well.and i have chacked RAM and graphic card,its working fine.
plz tell me what is the problem.???

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Good points from earlier replies: is right that kiosk gear is often proprietary and the maker's service docs help a lot, and is correct that a power-rail problem can let fans spin while other subsystems fail. Below is a focused, practical troubleshooting workflow to isolate whether the fault is the display assembly, the system board/PSU, or a control/firmware interlock.

  1. Isolate the video path. If possible attach a known-good external monitor or use the board's external video output. If the external shows video, the internal panel, T‑con or LVDS/eDP cable is suspect. For built-in LCDs, shine a bright flashlight at an angle on the screen with power on — a faint image means the backlight/inverter is dead.
  2. Check power rails with a multimeter. Measure the motherboard/PSU test points for +12V, +5V, +3.3V and +5VSB (standby). Values should be within about +/-5%. A collapsing rail under load points to the PSU or a failed regulator on the board.
  3. Watch for POST/beep/LED codes and try a minimal boot (CPU + one RAM stick, onboard video if available). Remove nonessential modules and peripherals. Some kiosk boards show 2-digit POST codes or blink patterns that identify failures.
  4. Inspect connectors and board components visually — loose LVDS/eDP ribbon, damaged pins, blown capacitors on the display driver or T‑con board are common. If a T‑con board is present it is a cheap swap compared to replacing the whole panel.
  5. Be cautious with firmware: only clear CMOS or update BIOS with documented steps; proprietary kiosks may need vendor tools.

Safety note: mains and discharged capacitors are dangerous. If you are not comfortable with meter work or opening the chassis, get a qualified technician. When asking for more help, post the kiosk model, motherboard/PSU markings, any POST codes or voltages you measured, and clear photos of the board and display connectors — that detail usually points to the exact component to replace.

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Member Avatar for rproffitt

While having a broken machine is a pain, kiosks can be custom things and you have to get with its maker to see what spares and manuals they have.

But you tested some of the parts. What parts didn't you test? It's likely one of those parts.

Member Avatar for rubberman

Likely a power supply issue. Modern mother boards have 12v and 5v inputs, but usually one is inadequate (usually the 5v) for the load it needs to support. They don't fail immediately, but when they go, time to get a new PSU. This has happened to me in the past. My multi-meter found the problem in about 2 minutes.

commented: Having the right tools and skills for the job. DMMs are not optional in my view. +12
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