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hantarex polo 28 blows fuse
perjmolsen:
Hi
Did the bulb test removed the solder at pin 3 on flyback, and also with the HOT removed.
TP6 i had 155V adjusted it down to 145V
And then suddenly the bulb went out and the volt it fluxing between 5-20V at TP6 (the light bulb does not flicker)
If i remove the bulb i get 105V at TP6, but it goes down to 5-20V when i attach it.
perjmolsen:
Status - still the fluxing volts
All the caps are changed at the chassis.
I have also put in a new Flyback
Also put in a new HOT (the old one where OK)
Tested the diodes in the PSU selection , D116 to D119 all OK
Tested the diodes at the flyback D135, D135, D137 - all OK
Tested caps at the flyback C172, C174, C175 - all OK
When i test volt with flyback leg3 removed, and bulb on the pad to leg 3 i get fluxing volts, and no light in the bulb
If i test with the flyback connected i get a ticking sound.
I assume that my issue is caused by my T101 that it is an 2SK3567
original it where mounted an STP4NA60. - but I have for a breef moment had 145V steady with the 2SK3567 ...
perjmolsen:
Did some more tests..
Trying to isolate the PSU part of the chassis...
If I am right... then disconnecting the following will disconnect the rest of the chassis, so it will proof that my issue is in the PSU selection.
Lifting on leg at
L103, L106, and D118
Connected light bulb to the other site at L103 (close to PSU)
The 40W lightbulb still pulses... so it must be my T101 ...(still waiting for a replacement)
perjmolsen:
Well.. new T101 mounted (with isolator), an STP4NK60Z (600 V - 4A Nchannel mosfet)
Nearly identical with the orginal in the monitor. STP4NA60 (600V - 4.3A N-channel mosfet)
All is connected, new flyback and L103, L106, and D118
Still the same issue the monitor is ticking!!!!!!!!!!!!!!! :badmood:
Have tested all - only one thing seems out of spec..
C170, is an 330nf - and if i test it it reads as 322 nf esr 0,11 ohm (can low esr aslo be a bad thing)?
If i look in the manual is says that C170 needs to be 820nf
I do not have a 820nf poly cap in my parts, I do have a 330nf poly cap
But can I rule the C170 out, if i disconnect L103, L106, and D118?
And to the bulb test conneted to the other end at L103?
grantspain:
c170 is a 330nf 250v
322nf is 330nf