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Author Topic: hantarex polo 28 blows fuse  (Read 1079 times)

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perjmolsen

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Re: hantarex polo 28 blows fuse
« Reply #40 on: June 09, 2019, 07:09:35 am »
A new picture of the back pcb after I have cleaned it up and touched the solder points up.
Have i miss anything?

perjmolsen

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Re: hantarex polo 28 blows fuse
« Reply #41 on: June 09, 2019, 08:39:44 am »
Clearly I must have a short somewhere at the TP6 line... :dizzy:

Therefore I desordeled the new flyback completely, and removed it from the chassis, and removed the HOT (BU508A)
Now i have an OL between chassis and TP6  :applaud:

And when i put the bulb between flyback pad (leg3) and chassis I get the bulbs ohms reading at 102.9 ohms - so thats all good..

BUT still fluxing volts when i test B+  :banghead:
Neckboard and yoke are connected to the monitor when testing

Have also tested with a new HOT in place, still OL in ohms reading and tp6 when bulb is disconnected.

If I turn the bulb out of its socket for a couple of seconds the volt rises to 90V but drops when i turn the bulb back in in order not to blow something up.
(If the bulb is disconnected for a long time the D116 gets hot and blow up)

So is it my transformer.. even that I am unable to measure some shorts between the coils, but if it where the transformer in my opinion, it would not be able to produce 90V without load..
« Last Edit: June 09, 2019, 10:29:43 am by perjmolsen »

perjmolsen

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Re: hantarex polo 28 blows fuse
« Reply #42 on: June 11, 2019, 04:22:47 pm »
Close up at the back pcb - zener diode connection to transformator
I "think" that the two pads needs to be connected. When i remove the zener diode at do a connectivity test with my multimeter, there still are connectivity to the pad at the transformator.
The is missing a bit of one pad - where the one end of the 16 zener diode is solder in.

princess prin prin

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Re: hantarex polo 28 blows fuse
« Reply #43 on: June 12, 2019, 04:04:06 am »
The zener is connected to the gate of the mosfet and ground (the half ripped pad). The damaged pad is not to be connected to the pad next to it.

perjmolsen

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Re: hantarex polo 28 blows fuse
« Reply #44 on: June 12, 2019, 04:36:41 am »
Okay... well grantspain sad the same..  ;D

Then I  have to figure out why I get connectivity between the pads even with the zener out of its hole...hmm

I must say that both you and Grantspain know laot about chassis repair... THANKS for you help :)

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Re: hantarex polo 28 blows fuse
« Reply #45 on: June 12, 2019, 04:50:08 am »
Hi

I have now removed the solder at the middle leg at the transformer - now there is NO connectivity between the two pads  :cheers:
(only connectivity if i touch the pin)

So thinking to put in a new zener, test for connectivity between the pads.. then solder the pin in again, and test if that has done something good.. or i might have blown something up by bridging the two pads.

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Re: hantarex polo 28 blows fuse
« Reply #46 on: June 12, 2019, 05:36:24 am »
You get "connectivity" because of the jumper. The jumper grounds one of the transformer's legs and the legs are connected together by the windings so yo'll always have "connectivity" across the half ripped pad (which is ground) and any of those three transformer's legs. If the zener is good and you can solder it reliably to that half pad, move on.

perjmolsen

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Re: hantarex polo 28 blows fuse
« Reply #47 on: June 12, 2019, 06:51:57 am »
Thanks! :)

I have tested the zener diode - it where fine.
Put it in and checked my soldering  :laugh:
Even tried a new 18V zener. - but still the same... :badmood: