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You're discussing about the width problem to picture. If yoke have a short in between its wingdings [even a single winding short], will cause the failure of horizontal output transistor. As per you report here, the set has a raster, but problem is with the picture width. There possibliliites for this fault are. 1. Lack of voltage from the SMPS power supply output. 2. Horizontal width capacitor. 3. Horizontal output capacitor. Check the output voltage from the SMPS section first, and confirm that it is OK.
A width issue specially if this is short of width on the screen can be due to many reasons:1. It can be a low +B which means the SMPS power supply has a lower output due to low Switching or a low value on the main capacitor. Check this out, measure the +B on the mains end and also the secondary side which will confirm.2. If the secondary +B is correct the fault can be with the sync circuit IC or the horizontal coil or even a fault with the deflection coil. A proper measurement of the voltage in this section is important.3. Check for weak capacitors and DRY soldering on the horizontal section , line output section.
hi, your monitors horizontal deflection side have some problem. you have to check the horizontal width cotrolling transistor mounded on the aluminum heatsik near the lot( line output transistor). also check the three mosfets which adjust the width for different resolutions. there are three such mosfets in the horizontal section.
fist of all replace the width controlling transistor in the heat sink. photo of mosfet and transistor is added for reference. not the exact number. ok
One of two
1. If the printing stops with clear stopping edge, then the PRINT WIDTH
setting has been changed from the default full width setting of 104mm.
Check this by pressing MENU and then the NEXT button until you see a setting for MAX WIDTH. It should be set to full width of 104mm. Anything less will stop printing beyond whatever the setting is. Change it back to the full width setting.
2. If the printing stops by fading away to the right side, then that is
caused by a pressure imbalance across the printhead. There is more
pressure on the left side than the right side. There are two toggles
that press down on the printhead and the pressure can be adjusted by moving the right toggle to the right so that more pressure falls on that side of the printhead.
If the width is shrinking, check also if the edges are now distorted too.
If so, there is a 'bipolar' capacitor in the high voltage section that is failing.
To find and verify this, you will need a meter that can measure capacitance, and perferably, DF or losses of capacitors as well.
If you ignore this, the horizontal will continue to shrink until the deflection stops completely and can cause other, more costly parts to fail although these may also be weakened and failing.
the controls for focus adjustment are on the flyback transformer, (that big black thing on the left hand side (usually) of the monitor with the thick red wire that goes to the CRT.) the flyback may have 1,2,3 or even 4 knobs on it. 3 of these would be labled SCREEN (bottom knob of flyback. handles brightness)
FOCUS 1 + FOCUS 2 (focus adjustments. these are what you need to play with) and the 4th knob (some old mitsubishi workstation monitors had these) i do not know, it wasnt labled and HV adjustment was on the deflection board