Maker Pro
Maker Pro

Part Sub 4 test (opinion wanted)

F

Fannie

Jan 1, 1970
0
Just for a quick test and not wanting to damage
any parts inside my TV `could' I put a

D1554 (NTE equiv: NTE2331)
in for a
D1398 (NTE equiv: NTE2302)

they are NPN Horizontal Deflection Output
transistors with damper diode.

The data sheet for both NTE equivalent types
are virtually identical. I just want to pop it in
for a quick check and it won't be left in for the
operation of the TV. I just want to confirm if
the original (D1398) is defective or not.

Opinions please.
 
T

Tom MacIntyre

Jan 1, 1970
0
Just for a quick test and not wanting to damage
any parts inside my TV `could' I put a

D1554 (NTE equiv: NTE2331)
in for a
D1398 (NTE equiv: NTE2302)

they are NPN Horizontal Deflection Output
transistors with damper diode.

The data sheet for both NTE equivalent types
are virtually identical. I just want to pop it in
for a quick check and it won't be left in for the
operation of the TV. I just want to confirm if
the original (D1398) is defective or not.

Opinions please.

Do an ohmmeter/diode check on the original transistor. Those HOT's
rarely, if ever, fail intermittently or leak, they just die.

BE you'll get high one way and low the other, BC will be the same,
while BE will measure the same in each direction, higher than the low
for the other 2 junctions, but not the typical high for a
reverse-biased diode (due to the damper diode).

If I remember correctly, the 1398 had a metal back/tab for heat/power
dissipation. The 1554 definitely did not. Possibly good for a brief
test, but, if I'm right, not a permanent solution.

There is a big difference in the power dissipation for the NTE devices
at least...

http://www.nteinc.com/specs/2300to2399/pdf/nte2302.pdf

http://www.nteinc.com/specs/2300to2399/pdf/nte2331.pdf

As for the original devices, I don't know.

Make sure you use the insulating spacer and heat sink compound for any
metal-backed transistor you end up using in the end.

Tom
 
T

Tom MacIntyre

Jan 1, 1970
0
Do an ohmmeter/diode check on the original transistor. Those HOT's
rarely, if ever, fail intermittently or leak, they just die.

BE...

Sorry...should be CE...

Tom
 
Top