Sony J21MF1 - Picture is too dark

[sira_c]

Dear All my friends

I found a very old TV from my mom's place and when I looked it the flyback was blown up . So, I found the model number of the flyback and replaced the used one, just borrow it from my friend who repair TV it is - "811" . so it's working again. however, the brightness seems very low on this unit and I tried few settings on service mode and finally did a factory default on all settings. now the brightness seems even worse. when I check G2 voltage(1000v) around 900 and 200V seems 190 v of the CRT board seems low. I downloaded the diagram but I believe the flyback is not the correct one. Do you think is this issue with Flyback or other electronics

Please let me know your valuable answer.

sira

 

[Nigel Goodwin]

Have you tried adjusting the G2 voltage?, usually with a pot built-in the transformer.

I would suspect that it may well just be that the CRT is worn out?.

 

[LandonRobinson]

Have you tried cleaning the glass screen with window cleaner yet?

Really... try cleaning the glass.

Aside from that it sounds like a low voltage issue, I'd check all of the capacitors that are in that circuit.