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CT3799B / WALTHAM [TV 36/37 (34-36) cm picture]

The EURAS repair tip database for professional technicians and service engineers supplies the following faults for CT3799B / WALTHAM.

List of fault symptoms:
  • No picture. Audio OK .
  • No start-up.
  • No function via 12/24V power supply.
  • Key-LED lights green for a short time, then becomes red.
  • No HV.
  • Switches to standby (after warm-up).
  • Volume uncontrollable. Crackling audio, in standby. OK after a few mins.
  • 2-3 cm horizontal stripe in the middle of screen.
  • Stuck in standby.
  • Does not start up. Standby LED is present at switch-on. LED becomes green for one sec., then it switches off.
  • No start-up. LED is red .
  • Dark stripes in picture after a few minutes. Growing thicker and distorting the picture.
  • Dead (intermittently).
  • Green picture. Flyback lines.
  • Blue screen.
  • Picture is instable, horizontal lines from the top to the bottom.
  • No colour.
  • Picture folds down at the bottom. Linearity and vertical position cannot be adjusted. (service info for WALTHAM -CT3799B)
  • Appliance stuck in BG mode.
  • PSU pulsates quickly at switch on.
  • Black vertical bar. on the left.
  • Vertical lines. Unstable picture.
  • Vertical deflection reduced to 2-4 cm.
  • HV output stage (BU808DFI) defective.
  • No horizontal or vertical deflection.
  • No picture. Blank raster. Audio OK .
  • Horizontal line.
  • Slow start-up.
  • Switches to protection mode.
  • Line output transistor faulty.
  • No functions.
  • Blue picture. Retrace lines.
  • Intermittently switches off and goes to standby. If switched on again, a digit key has to be pressed on RC.
  • Blue screen. Flyback lines.
  • No start-up. Display flashes .
  • Q602 trips repeatedly.
  • No start-up from standby.
  • BU808DFI fails every so often.
  • No funciona. LED en rojo
  • R809 and R821 smoking after a few minutes.
  • Dead.
  • Dark picture.
  • Audio dropouts via SCART socket.
  • Enter service mode. (CT3799B tips)
  • No start-up from standby. LED is red . No line drive.
  • RC is defective.
  • Picture appears slowly (5-10 mins later after start-up). Audio OK.
  • TV does not switch on. Standby LED flickers.
  • 8V missing.
  • Squealing noise. at start-up.
  • Strong continuous chirp from mains transformer with normal operation. Horizontal interference lines (pinch).
  • Vertical streaks. (service info for WALTHAM -CT3799B)
  • Tripping.

Tips are coming from EURAS customers, workshops and payed technicians from all over the world. WALTHAM CT3799B fails can be better solved.

If WALTHAM CT3799B 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 WALTHAM CT3799B fails.


Additionally to repairtips or service information CT3799B 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 CT3799B ).

EURAS system also knows 320 appliances having the same chassis as CT3799B and can easily list them.

For CT3799B there are 8 compatible appliances known and can be listed.


In the repair discussion pinboard for CT3799B there are 42 replies to questions asked about 17 different repair problems.
With access to EURAS you can all read them or enter your own questions and get help for CT3799B 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 TV/household electronics repair shops/technicians/Video 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 household/TV/Video electronics repair shop close to you.

Already registered? open CT3799B WALTHAM in EURAS

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Last updated: 14. Oct 2008 06:40:29 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.