28B8T07NX / SANG [TV]

• Line tearing. intermittently. Squealing noise.
• Poor focus.
• Top quarter of screen is lit. Rest of screen is black.
• No start-up from standby. LED is red when switching.
• No luminance.
• Switches channels automatically upwards. Maximum volume.
• Pulsating picture. Picture shrinks horizontally and expands vertically when changing brightness.
• Mains fuse blows sporadically.
• Red and green area on every side of the screen when warm.
• No tuning.
• Tuning drifts. (service info for SANG -28B8T07NX)
• Stripes in upper picture.
• Changes picture size when increasing audio volume.
• No REC.
• No raster (intermittently).
• Horizontal line.
• No picture. intermittently. OSD OK . (service info for SANG -28B8T07NX)
• Dead.
• No picture. Red, green or blue raster.
• White balance adjustment. (28B8T07NX tips)
• Poor picture.
• Mains fuse is defective.
• Stuck in standby. Tripping noise at first switch-on.
• Stretched picture. intermittently.
• Vol up/down buttons change program number.
• No functions.
• No picture. Audio OK .
• R528, R530 and C524 defective. (28B8T07NX tips)
• Low contrast.
• Brightness varies.
• +B voltage is 160V instead 145V.
• Blurry picture.
• AGC adjustment.
• B+ voltage (+140V) missing. (28B8T07NX tips)
• No picture. intermittently. Audio OK .
• Flyback lines. intermittently.
• C530 fails repeatedly.
• Enter service mode.
• Not storing programme data.
• Low tuner gain but can be tuned in.
• Horizontal output transistor fails repeatedly. (28B8T07NX tip from SANG)
• Switches to standby at start-up. LED flashes 2 times.
• PSU pulses and there is popping from the speakers before set trips back to standby.
• Volume increases to max.
• Horizontal collapse. intermittently.
• Beeps now and again. (28B8T07NX SANG repair tip)
• Fuse (2.5A) is intermittently defective.
• White lines.
• No vertical deflection.
• Picture rolls.
• Distorted audio. via speakers.
• Horizontal line. Black screen. on lower half screen.
• No picture. on lower half screen.
• No 8V and 5V voltages.
• Squealing from PSU (intermittently).
• Flyback lines appears when brightness increased.
• No picture. intermittently.
• Noise on some channels.
• Picture comes in after approx 1 min when started up from standby.
• No start-up from standby.
• Power supply blown. Mains fuse black. Possible lightning strike. (service info for SANG -28B8T07NX)
• Tripping at switch-on. Popping noise from speakers.
• Upper part of picture is fuzzy and messed up, after was powered off for a few hours.
• White picture with flyback lines from time to time. (28B8T07NX tips)
• Switches to standby. intermittently. No start-up from standby. intermittently.
• No TXT.
• Vertical collapse.
• No audio.
• Reduced horizontal size. No E/W correction.
• Picture shifts.
• Cycles on/off. Knock sensitive.
• Cracking noise in standby.
• C619 burned.
• Black dots on the screen.
• No picture. (28B8T07NX tips)
• PSU blown after power failure.
• No synchronisation. No TXT.
• PSU pulsates.
• Shuts down (intermittently).
• Trips.
• Popping noise when switched off.
• Volume decreases to min.
• Brightness varies. intermittently. (28B8T07NX SANG repair tip)
• Snow in picture.
• Picture size varies with picture content.
• No audio. No game. No calculator.
• Set trips at switch on.
• PSU collapses and trips as soon as appliance is swichted to full mode. Standby OK.
• Protection mode activated. in standby.
• No RC functions.
• Flyback lines.
• Coloured spots on the corner.
• No vertical deflection. Only a horizontal line at top.
• Trips. at start-up.
• No HV. (28B8T07NX tips)
• No picture or sound via AV1. AV2 and AV3 ok.
• No vertical deflection. on lower half screen.
• Dark picture.
• How to test the PSU using a lamp.
• No focus.
• Switches to standby. intermittently.
• No picture, only snow.
• No 15V, 8V and 5V voltages.
• No picture (intermittently). Audio OK .
• Squealing noise.
• No power.
• No start-up.
• HV builds up and then collapses.
• Geometry adjustments.
• Vertical lines. (28B8T07NX tips)
• Trips. after start-up. (28B8T07NX tip from SANG)
• Poor picture. after start-up.
• PSU does not start up correctly.
• Switches to protection mode. after start-up.
• Picture shifted to the left about 1 inch.
• +B voltage is 20-80V instead 145V.
• Reduced vertical size. Vertical foldover. when cold.
• Tripping.
• Switches off by itself.
• Flyback lines. after warm-up.
• No AV.
• Black screen. after a few seconds.
• Stuck in standby.
• Slow start-up. (28B8T07NX tips)
• Picture gradually disappears after start-up. Flyback lines, poor picture content.
• Line output transistor fails repeatedly.
• Dead. Standby LED does not light. (28B8T07NX SANG repair tip)
• Some channels missing.
• Poor picture, exaggerated contrast and colours, brightness varies.
• Spots on the screen during shut off.
• PSU pulsates. Standby LED flashes .
• Excessive brightness. Flyback lines.
• PSU lamp test.