Checking equivalent parts for an arcade monitor chassis

[MrKnockoff]

Hi Everyone,

I'm repairing an arcade monitor chassis and I've had to use a few equivalent parts. I wanted to check that I have picked the correct ones that are compatible.

I needed a replacement for a fs14sm-16a (N-Channel MOSFET Transistor) and this seems to be a IXFH14N80P.
Vds match, 800V, Vgs match +/- 30v, Id match 14A and also Rds(on) match 0.7 ohm
Anything else I need to consider here?

I also needed a replacement for 2sc5144 (Horizontal deflection output) which seems to be a FJL6920TU.
Vcbo match (1700v), Vceo higher (600 vs 800) and Vebo higher (5v vs 6v).  Ic is the same, 20A DC, but pulsed is 30A vs 40A. Pc is the same, 200W.
Will this function the same, or do I need to consider the rest of the circuit?

I also needed a replacement for a KA3842B (SMPS Controller) which seems to be UC3842B (High Performance Current mode PWM Controller).
The supply voltage matching (30v), output current match (1A), analog inputs are slightly lower, -0.3 to 6.3v vs -0.3 to 5.5v, but power dissipation matches at 1.2 W (well 1.2w vs 1.25w close enough).

Have I done the correct parameter matching here? I wanted to double check with someone before I go blowing up the chassis.

[fzabkar]

ISTM that your substitutions are OK. Some line output transistors have base resistors or a diode between C and E, but yours are straightforward. That said, I always hate subbing these transistors because I am never sure how they will function. I suggest you run the monitor for a minute, switch it off and then feel the temperature of the transistor. If it runs cool, then soak test it for a few hours.

I would also suggest that you test and replace any high ESR capacitor in the drive section, and reflow the solder to the pins of the drive transformer even if they look OK.

Edit:

I recommend that you avoid Chinese sources. Too many fakes ...

[MrKnockoff]

Thanks fzabkar. I've already done a full replacement of the capacitors and all parts are from the major parts suppliers, mouser, digikey, wes components etc. It looks like it failed and someone tried to get it going by doing insane things like shorting the in rush current limiting NTC etc. That resulted in blowing several IC's like the PWM controller etc. Lots of soot around the flyback which I have already sourced too. Hopefully I'll get it back running.