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Hantarex polo 25-28 multisync horizontal with control (SOLVED)
princess prin prin:
At this point I would replace the TDA8145. B+ is 118V for 15KHz and 160V for 25KHz.
perjmolsen:
Hi
Thanks :) :notworthy:
Changed the TDA8145 but no change to the picture. :censored:
Had the monitor on for 10 minutes, when I looked my green color where suddenly missing... It wan to to give me a fight... :badmood:
Well tried to find my missing green...
1. Tested that if I moment-ly added ground to the green pin on the crt I got green screen.
2. The big resistor on the neck board, it tested fine (the one in the middle do not get warm as the other does.)
3. re flowed the ribbon cable to the neckboard, still no green.
4. Tested the green drive transistor T504 BF859, it where fine
5. Tested the transistor T505 C547b, it where fine
6. tested the electrolytic caps on the neck, c504 tested fine
7. Tested d503 it tested fine
8.Tested R533
hmm...... :hissy: :hissy:
princess prin prin:
If you have voltage on the green input pin of the LM1203 but nothing on the output the IC is bad.
As for the other issue I don't think there's much left to check. C302 maybe.
perjmolsen:
--- Quote from: princess prin prin on January 21, 2020, 12:21:55 pm ---If you have voltage on the green input pin of the LM1203 but nothing on the output the IC is bad.
As for the other issue I don't think there's much left to check. C302 maybe.
--- End quote ---
Hi :cheers:
I have now put in a new LM1203 - still no green
Backtracked from ribbon cable at neck board to R154 OK -> T105 (C547B) OK
C302 is changed, still curved.. :hissy: :dunno
Started to mark the components that I have checked in the schematic, it seems that there still are a lot to check, and I might have checked stuff that not are related to green.... :banghead:
Marked yellow ->components that I need to check in order to get green back.
Marked Green -> components that are checked
The chassis from Hell :laugh2:
grantspain:
does the green cut off have any affect