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Another Hantarex polo 25-28 repair (SOLVED)
perjmolsen:
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?
perjmolsen:
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:
perjmolsen:
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?
perjmolsen:
Will try to check the tda1675a later today...
perjmolsen:
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: