21B7M12TX / SANG [TV]

• Reduced vertical size.
• PSU pulsates (after start-up).
• No channels.
• Intermittent failure T506. No apparent cause.
• Only AV operation possible. No tuner reception. (21B7M12TX tip from SANG)
• Only a white line.
• Flickering picture. in TXT.
• No colour (intermittently).
• Flickering picture.
• Enable Hotel mode.
• Dark picture.
• No power.
• White flyback lines. (service info for SANG -21B7M12TX)
• Switches on but no user controls or RC.
• Intermediate frequency adjustments - BG, DK, I standard. (picture attached)
• Intermittently picture is dark/green, no sync, no audio, no tuning.
• Vertical fault. at top.
• Whistling.
• Picture shifted horizontally.
• No or poor audio.
• Picture too small. Picture runs through.
• Red picture.
• Pincushion distortion. (service info for SANG -21B7M12TX)
• Intermediate frequency adjustments - SECAM LL' standard. (extract of circuit diagram attached)
• No tuning. No red LED.
• Only standby, pulsates after switch on. (21B7M12TX tips)
• No AV.
• Dead.
• Switches by itself to AV, info menu is intermittently distorted. No front controls.
• Tripping.
• Menu flickers. (21B7M12TX SANG repair tip)
• Stuck in standby.
• Wrong colours on corners.
• No picture. Audio OK .
• No start-up.
• Vertical synchronisation fault in OSD. Picture and functions OK..
• No OSD. (21B7M12TX tips)
• No start-up. Standby LED lit .
• Horizontal line.
• Low contrast.
• Picture is too wide. Width changes depending on beam current.
• Disable child lock.
• Stuck in standby. Pressing "Progr" keys comes in, then reverts immediately back to standby.
• White screen.
• No line drive. Standby LED lit .
• Vertical fault.
• Flyback lines.
• No picture. at bottom. Vertical fault.
• No blue.
• Snow in picture.
• Switches to standby. after a few seconds.
• Dead. LED blinks .
• Enable child lock.
• OSD shifted.
• Disable hotel mode.
• Screen adjustments.
• Geometry adjustments.
• Power supply voltage adjustment. (picture attached)
• Blows fuse.
• Vertical error. Reduced and distorted picture amplitude.
• Switches to protection mode.
• No colour.
• No synchronisation.
• Dark screen. Audio OK .
• White balance adjustment.
• Vertical collapse.
• Switches to standby.
• No audio.
• No horizontal synchronisation.
• Black lines on the picture. OSD displays jitter. TXT does not function or does not synchronise. Picture and sound present.
• No UHF channels.
• Shading at top when adjusting to 16:9 mode.
• Faulty OSD or poor colours.
• Sound standard adjustment.
• Shuts down.
• No picture.
• Restore factory settings.
• Horizontal lines. intermittently.
• Brightness varies.
• How to change SYSTEM MODE DKK.
• Standby flashes, if ON briefly high voltage, then standby again.
• PSU is defective.
• Enter service mode.