Horizontal Lines in picture

Sounds like the convergence has failed. This video gives more details

convergence problem

The chassi will need to be removed and sent to Mitsubishi to be rebuilt.

Give it time to warm up like another 10 to 15 mins i find put a tv guide channel on the screen stays pretty much the same picture, then leave the TV on" i use a 4 hour rule if i dont view in 4 hours or more i will close tv power

i think the color wheel is in need of calibration.

probably a bad connection on the circuit board inside that heats up over time. the tap on the top probably moves the connection just enough To make it good for short time.

Good Day, valscot;
The most common problem with model i some caps on the signal board, CHECK C2P08 100 UFD 16 V OFF PIN 3 OF IC2P03 (3.2 VOLT REGULATOR) ON THE SIGNAL PCB.
good Luck big IRISH.

Good Day, Delano1981;

It may cure the problem but I would suspect the 9 Volt source
CHECK C2P05 100 UFD 16 V OFF PIN 3 OF IC2P01 AND
IC2P01 PART # 270P466020 (9-VOLT REGULATOR). BOTH
ARE ON THE SIGNAL PCB.

This should resolve your TV"s condition.

Good Luck, big IRISH.

Uneven colors with multicolored lines in the center of the picture and/or flashing, C9A37 and C9A38 both 3300 UFD 10 V part # 181P732040 on the Power PCB (part # 930B921002)

Set starts, horizontal and vertical deflection work, HT ok, crt heaters ok, but no sound or picture
I turned the G2 voltage up and noticed a white screen with flyback lines, frame ok. I detected two badly soldered double diode rectifiers in the secondary part of the power supply ! I checked all other joints, and everything was ok !! success
White horizontal line (no vertical deflection)
Check / replace R548, R549
Sound but no picture except for a couple of horizontal colour lines
Replaced the frame chip TDA8356, set now ok