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CTV3704 / LENCO [TV 36/37 (34-36) cm picture]

The EURAS repair tip database for professional technicians and service engineers supplies the following faults for CTV3704 / LENCO.

List of fault symptoms:
  • Switches to standby (after warm-up).
  • R809 and R821 smoking after a few minutes.
  • Picture appears slowly (5-10 mins later after start-up). Audio OK.
  • RC is defective.
  • No functions.
  • Green picture. Flyback lines.
  • Key-LED lights green for a short time, then becomes red.
  • Blue screen.
  • Audio dropouts via SCART socket.
  • Tripping.
  • No colour.
  • Volume uncontrollable. Crackling audio, in standby. OK after a few mins.
  • Black vertical bar. on the left.
  • 2-3 cm horizontal stripe in the middle of screen.
  • Dark picture.
  • No HV. (service info for LENCO -CTV3704)
  • TV does not switch on. Standby LED flickers. (CTV3704 tips)
  • No start-up.
  • Line output transistor faulty.
  • No start-up. LED is red .
  • Dead (intermittently).
  • No start-up from standby. LED is red . No line drive.
  • No picture. Blank raster. Audio OK .
  • No function via 12/24V power supply.
  • No start-up from standby.
  • Does not start up. Standby LED is present at switch-on. LED becomes green for one sec., then it switches off.
  • Picture is instable, horizontal lines from the top to the bottom.
  • Appliance stuck in BG mode.
  • BU808DFI fails every so often.
  • No start-up. Display flashes .
  • Stuck in standby.
  • HV output stage (BU808DFI) defective.
  • Q602 trips repeatedly.
  • Slow start-up.
  • Picture folds down at the bottom. Linearity and vertical position cannot be adjusted.
  • Intermittently switches off and goes to standby. If switched on again, a digit key has to be pressed on RC.
  • No picture. Audio OK .
  • Vertical deflection reduced to 2-4 cm.
  • No funciona. LED en rojo
  • Dead.
  • Enter service mode. (CTV3704 tips)
  • Strong continuous chirp from mains transformer with normal operation. Horizontal interference lines (pinch).
  • PSU pulsates quickly at switch on.
  • Squealing noise. at start-up.
  • No horizontal or vertical deflection.
  • Vertical lines. Unstable picture.
  • Switches to protection mode.
  • Blue picture. Retrace lines.
  • Blue screen. Flyback lines.
  • 8V missing.
  • Horizontal line.
  • Vertical streaks.
  • Dark stripes in picture after a few minutes. Growing thicker and distorting the picture.

With this service information, you may repair LENCO CTV3704 faster/better when it fails.

When LENCO CTV3704 fails , these symptoms are known and EURAS knows the remedy/solution.

Tips are coming from EURAS customers, workshops and payed technicians from all over the world. LENCO CTV3704 fails can be better solved.

If LENCO CTV3704 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 LENCO CTV3704 fails.


Additionally to repairtips or service information CTV3704 is linked to 72 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 CTV3704 ).

EURAS system also knows 320 appliances having the same chassis as CTV3704 and can easily list them.

For CTV3704 there are 6 compatible appliances known and can be listed.


In the repair discussion pinboard for CTV3704 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 CTV3704 from EURAS technicians or other users.

Do you want to see this remedies/cures for repairtips?   Register here for the EURAS System
Please note: access to the EURAS System can be granted only to professional Video/household electronics repair shops/TV/technicians which are authorized for service by a manufacturer, or can prove to be professionally certified to do repairs on electronic appliances. You will be asked for a statement and information accordingly during registration.

If you do not qualify as stated above and you have an appliance that needs technical service, we do recommend you to contact the manufacturer (for example through his website) or go to a professional TV/household/Video electronics repair shop close to you.

Already registered? open CTV3704 LENCO in EURAS

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Last updated: 06. Oct 2008 14:36:27 MET, doccode ISO9002AS168EKA200805C EURASMOP

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All brand- or productnames are copyrighted by the respective manufacturer of the appliance and are only being used for identification purposes.