Build Your Own Arcade Controls Forum

Main => Monitor/Video Forum => Topic started by: perjmolsen on June 17, 2019, 12:45:31 pm

Title: Another Hantarex polo 25-28 repair (SOLVED)
Post by: perjmolsen on June 17, 2019, 12:45:31 pm

Hi

I got my fingers in another hantarex Polo 25-25 that I am trying to repair..
When i got the chassis the NTC and fuse where blown, NTC and Fuse replaced

- I have checked all the diodes in the PSU selection, all are OK.
- Zener diode is OK
- Checked the two large resistors they are OK.
 - T101 is OK
- HOT is OK
-Changed the large 220uf 400V cap and also C111, C112 and also the poly caps C104 and C105

- Also removed the solder at flyback pin3 and1 - and connected a  40w bulb to chassis ground. 0 V at TP6

So stepped back to TP1...there is 0V at TP1?

Where is my volts at TP1?

Title: Re: Another Hantarex polo 25-28 repair
Post by: perjmolsen on June 17, 2019, 03:31:23 pm

Found a bacd trace in the PSU section.. now i have B+ over 200V!
(with  HOT removed the solder at flyback pin3 and1 - and connected a  40w bulb to chassis ground)

Changed C112 + C114 still HIGH B+ at 200V and unable to turn it down  :dizzy:

Title: Re: Another Hantarex polo 25-28 repair
Post by: perjmolsen on June 17, 2019, 05:39:56 pm

A broken trace more in the PSU selection where the issue.
Now i can adjust it down to 145V .. but the R167 went up in smoke.. thinking that mig have been to the high B+ earlier?

Title: Re: Another Hantarex polo 25-28 repair
Post by: perjmolsen on June 18, 2019, 03:36:28 am

Will try to check the tda1675a later today...

Title: Re: Another Hantarex polo 25-28 repair
Post by: perjmolsen on June 18, 2019, 08:28:06 am

Put in a new tda1675a and a new C139
Now the R167 does not get hot anymore  :applaud:

Put it all together, tested my voltages they are spot on  :applaud:

TP6   145            
TP10   11.92         
TP8   26,7      
TP9   16,5      

But I have a collapsed picture, so tested
TP31 0V   

Test before R167 25V

So I got a blown  R167   (2R7)

I Think that i blew up before i changed the tda1675a (it smoked)
So I am waiting for some new 2R7 resistors... then hopefully a working chassis! :notworthy:

Title: Re: Another Hantarex polo 25-28 repair
Post by: perjmolsen on June 18, 2019, 03:45:30 pm

Found a 2R7 in my spare parts

Now there is picture!!!!!!!!!!!!  :applaud: :applaud: :applaud: :applaud: :cheers:

Just need to have the with of the picture adjusted, but there is no control for the with of the picture, i can only adjust it from side to side... hmm

Title: Re: Another Hantarex polo 25-28 repair
Post by: princess prin prin on June 19, 2019, 05:23:19 am

H AMP doesn't work? That's what adjusts the size.

Title: Re: Another Hantarex polo 25-28 repair
Post by: perjmolsen on June 19, 2019, 05:51:53 am

Hi

Yes the H amp worked  ::)
The first time when i tried to adjust it, it did not seem to work at all... tried one more time and now the picture is perfect :)

Title: Re: Another Hantarex polo 25-28 repair (SOLVED)
Post by: perjmolsen on June 19, 2019, 05:55:07 am

Just for later if someone has the same problem:

Parts checked OK:
d102
d103
d104
d105
d106
d107
d108
d109
d110
d111
d112
zd101
d116
d117
d118
d119
t101
T114
R110
R115
d127

Parts changed:
r103 ntc 20e
c104 220nf 250n poly
c105 47nf 250v poly
c108 220uf 400V
C111 220uf 25v
c112 22uf 50v
C114 22uf 50v
R167 2r7
IC103 tda1675a / vertical ic
C139 1000uf 35V

Title: Re: Another Hantarex polo 25-28 repair (SOLVED)
Post by: perjmolsen on June 21, 2019, 12:34:34 pm

Just some final notes

I got rasterlines between pictures. ->
https://www.youtube.com/watch?v=F0ISyPuQ9qs
Changed first C172, c174 but no real change

Changed R36 and R235 and the issue where gone! ->

https://www.youtube.com/watch?v=10X0cSmTmD8