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.
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