MTS74U1 / MELECTRONIC [TV (Standard)]

• Dark picture. Audio OK .
• LED blinks twice and then switches off.
• Line tearing.
• Frame output IC (TDA8350Q) fails again after approx three months.
• Enter service mode.
• No function. PSU switch transistor always switches through shortly. Does not start up correctly.
• White lines at the top of picture.
• Distorted display.
• Narrow diffuse lines in upper picture section. (service info for MELECTRONIC -MTS74U1)
• No audio.
• Cycles on/off. intermittently. No reception. intermittently. Knock sensitive.
• Vertical fault. (MTS74U1 tip from MELECTRONIC)
• Horizontal line. No vertical deflection. Audio OK .
• No audio. No picture. LED is green. (MTS74U1 tip from MELECTRONIC)
• Dead.
• Picture collapses on top and at the bottom.
• Intermittently no TXT and diagonal lines across the picture. Ok again after switching it off an on several times. Fault occurs in irregular intervals.
• No functions.
• Stripes at upper picture edge. Half picture is missing. Picture folds down on top or at the bottom.
• Upper picture third is dark (black) with horizontal flare. (MELECTRONIC - MTS74U1 information)
• Vertical approx. 3-5cm wide stripe in the centre.
• Supply voltage and protective circuit adjustment.
• Standby OK, switches on, but then switches off before picture appears.
• Focus adjustment.
• Vertical lines are initially distorted in RF and Scart. Ok when warm.
• Horizontal BU transistor is defective.
• Functions normally. Only input E2 remains in S-VHS position, even if switched to video in the relevant menu.
• Reduced horizontal size.
• How to switch to service mode when the appliance switches to standby after mains switch-on.
• No picture, no audio. Standby ok. LED switches from red to green at start up with RC,
• Line pairing occurs in upper picture section at strong contrast or according to picture content. At TXT picture OK.
• Transistor TK3 (BU2525AF) fails immediately after replacement.
• Excessive brightness. Flyback lines.
• Switches off by itself. after start-up. (MTS74U1 tip from MELECTRONIC)
• Sound fails, bass speaker remains active.
• Horizontal linearity adjustment.
• Brightness varies. Flyback lines.
• No vertical deflection.
• Lodret mørk stribe i venstre side.
• Line torn. Vertical lines are wavy.
• PSU transistor is S/C.
• No picture. Audio OK . (MTS74U1 tips)
• Appliance cannot be switched on from standby. Red LED for the RCU is flashing. (MTS74U1 MELECTRONIC repair tip)
• Vertical lines in the picture oscillate until there is a double outline. Fault is worse in bright picture content than in dark picture content.
• Wide black bars un upper screen edge.
• Crackling noise from subwoofer speaker when warm.
• Line socket failure every other two weeks.
• Switches off by itself. (MTS74U1 tips)
• Vertical output stage becomes repeatedly defective after few months.
• Reinitialise EEprom.
• Does not start up. Geometry and Feature Box adjustments are wrong.
• Half a picture.
• No picture. after a while.
• Reduced raster size. at top.
• No HV.
• Vertical foldover at top.
• LK1 (6.8R/0.5W) in horizontal deflection becomes hot and makes smoke.
• LK1 is burnt.
• Line output transistor TK3 defective after approx 10-20 mins.
• Lines in picture. at top (when cold).
• Distorted picture. at top.
• Resistor RK49 near horizontal line output transformer has blown.
• No start-up from standby. Fault occurs intermittently. .
• Test lines in top of picture.
• Horizontal stripe.
• Bright picture. Flyback lines. after start-up. Shuts down.
• Reverts to standby at first start-up. All OK after the second or third start-up.
• Linearity is folded over 2cm at the top
• No vertical deflection. Stripe in the centre, which becomes dark after approx. 2 secs.
• Picture flickers after some time and becomes dark.
• No picture. Stripes or bars in upper part picture.
• No HV (at start-up).
• Deflection fault.
• Linearity fault in upper picture section.
• No picture. after start-up (only snow).
• APS runs.
• Picture too small. at bottom. Retrace lines.
• No functions. Periodically slight clicking sound from PSU.
• Vertical fault, black bars on upper picture edge.
• No functions. Standby LED blinks three times. (MTS74U1 MELECTRONIC repair tip)
• Model release/pricing information.
• Horizontal transistor (BU2525AF) immediately defective at start up.
• Vertical collapse.
• Comes on for a short time.
• No picture. Only a few wavy lines No OSD and TXT. (MTS74U1 tips)
• No start-up. Standby LED changes from red to green.
• No start-up. (with circuit diagram extract)
• BU heats up and gets defective.
• Left loudspeaker drops out.
• Excessive horizontal size. E/W fault.
• Picture size varies with picture content. (MTS74U1 tip from MELECTRONIC)
• No picture and audio. Dull raster.
• Vertical stage fails.
• Horizontal line.
• OSD displays run through.
• Vertical waves in picture.
• Starting attempts. Speakers crack, switches off. (MTS74U1 tip from MELECTRONIC)
• Dark screen. No picture. (MTS74U1 tips)
• Switches to standby. after start-up.
• TDA8350Q fails.
• Faulty display operation. at top (on the right).
• Stripes in picture. on upper half screen.