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FX3720 / FIRSTLINE [TV 36/37 (34-36) cm picture]

The EURAS repair tip database for professional technicians and service engineers supplies the following faults for FX3720 / FIRSTLINE.

List of fault symptoms:
  • R809 and R821 smoking after a few minutes. (FX3720 tips)
  • Tripping.
  • No function via 12/24V power supply.
  • No start-up. Display flashes .
  • BU808DFI fails every so often.
  • Dead.
  • TV does not switch on. Standby LED flickers.
  • Enter service mode.
  • No picture. Audio OK .
  • No start-up from standby.
  • Picture folds down at the bottom. Linearity and vertical position cannot be adjusted.
  • Black vertical bar. on the left.
  • Strong continuous chirp from mains transformer with normal operation. Horizontal interference lines (pinch).
  • No functions. (FX3720 tips)
  • Dark picture.
  • Does not start up. Standby LED is present at switch-on. LED becomes green for one sec., then it switches off.
  • Dead (intermittently).
  • Slow start-up.
  • No horizontal or vertical deflection.
  • Appliance stuck in BG mode.
  • Squealing noise. at start-up.
  • Dark stripes in picture after a few minutes. Growing thicker and distorting the picture.
  • Picture is instable, horizontal lines from the top to the bottom.
  • Vertical lines. Unstable picture.
  • Key-LED lights green for a short time, then becomes red.
  • Switches to protection mode. (FIRSTLINE - FX3720 information)
  • Blue screen. Flyback lines.
  • Intermittently switches off and goes to standby. If switched on again, a digit key has to be pressed on RC. (service info for FIRSTLINE -FX3720)
  • Switches to standby (after warm-up).
  • No picture. Blank raster. Audio OK .
  • Green picture. Flyback lines.
  • HV output stage (BU808DFI) defective. (service info for FIRSTLINE -FX3720)
  • 2-3 cm horizontal stripe in the middle of screen. (FX3720 tip from FIRSTLINE)
  • Line output transistor faulty.
  • No colour.
  • Vertical streaks.
  • RC is defective.
  • Unstable picture.
  • No funciona. LED en rojo
  • No start-up. LED is red .
  • Blue screen. (FX3720 tips)
  • No HV. (FIRSTLINE - FX3720 information)
  • 8V missing.
  • PSU pulsates quickly at switch on.
  • Horizontal line.
  • Vertical deflection reduced to 2-4 cm.
  • Stuck in standby. (FX3720 tips)
  • Q602 trips repeatedly.
  • Blue picture. Retrace lines.
  • No start-up from standby. LED is red . No line drive.
  • No start-up.

Tips are coming from EURAS customers, workshops and payed technicians from all over the world. FIRSTLINE FX3720 fails can be better solved.

If FIRSTLINE FX3720 fails, this information will help you. Here you can only see the symptom list, to access remedies, you must register.

With help of this list a solution is found often when FIRSTLINE FX3720 fails.


Additionally to repairtips or service information FX3720 is linked to 60 components (IC's and/or transformers) in the Tectra database, through which you can identify electrical compatibilities (crossreferences) in appliances.


Chassis information is available (which chassis is built in into FX3720 ).

EURAS system also knows 327 appliances having the same chassis as FX3720 and can easily list them.

For FX3720 there are 8 compatible appliances known and can be listed.


In the repair discussion pinboard for FX3720 there are 42 replies to questions asked about 16 different repair problems.
With access to EURAS you can all read them or enter your own questions and get help for FX3720 from EURAS technicians or other users.

Do want to see this remedies/cures for repairtips?   Register here for the EURAS System

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Last updated: 18. Aug 2008 12:57:55 MET, doccode ISO9002AS168EKA200805C [cachelite] EURASMOP

Responsible for the content: EURAS International GmbH, Eime, Germany. All rights reserved, EURAS database V2.0 (C) 2002-2008. All brand- or productnames are copyrighted by the respective manufacturer of the appliance and are only being used for identification purposes.