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Author Topic: hantarex polo 28 problem(s) (SOLVED)  (Read 1460 times)

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perjmolsen

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hantarex polo 28 problem(s) (SOLVED)
« on: November 12, 2018, 02:20:02 pm »
Hi

I have a hantarex polo 28 in my Time chrisis II.

I got some strange issues, that I hope that you can help me solving

1. Problem - No picture or neck glow. (No ticking sound)
Solution I changed replaced the C114 and i got picture.  :D
BUT the B+ is around 132V if I adjust it higher to 135-138V the monitor shuts off, and the B+ volt raises to 139V-149V
So i had the B+ volt adjusted to 132V yesterday, and it seems fine, and I had picture :)

2. Problem today when I turn on the machine I got this strange picture?
« Last Edit: January 18, 2019, 05:14:34 am by perjmolsen »

grantspain

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Re: hantarex polo 28 problem(s)
« Reply #1 on: November 12, 2018, 03:38:39 pm »
looks like you lost 200v video b+ and there is an issue on the vertical deflection- all could be caps or bad solder joints, normally bright white screen is safety resistor blown on 200v video b+

usa or european chassis?

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Re: hantarex polo 28 problem(s)
« Reply #2 on: November 12, 2018, 03:49:24 pm »
looks like you lost 200v video b+ and there is an issue on the vertical deflection- all could be caps or bad solder joints, normally bright white screen is safety resistor blown on 200v video b+

usa or european chassis?
Hi

Thanks for the fast reply :)

It is a European chassis.
Where is the safety resistor? Then i will try to check it :)

I just measured my B+ and it is now only 113V at TP6 and I am unable to turn it up at the adjustment pot V.adj.

« Last Edit: November 12, 2018, 04:56:28 pm by perjmolsen »

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Re: hantarex polo 28 problem(s)
« Reply #3 on: November 12, 2018, 04:56:37 pm »
r234 10 ohm metal oxide, its critical to replace with same

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Re: hantarex polo 28 problem(s)
« Reply #4 on: November 12, 2018, 04:59:03 pm »
r234 10 ohm metal oxide, its critical to replace with same

Super - I will check that  and let you know.
I might also explain why B+ suddenly is doped to 113V

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Re: hantarex polo 28 problem(s)
« Reply #5 on: November 12, 2018, 05:07:27 pm »
the b+ is causing the vertical issue, polo 28 european chassis should be 145vdc b+
you could have  a bad mains filter cap, all the psu caps should be replaced if not done so already

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Re: hantarex polo 28 problem(s)
« Reply #6 on: November 12, 2018, 05:20:38 pm »
the b+ is causing the vertical issue, polo 28 european chassis should be 145vdc b+
you could have  a bad mains filter cap, all the psu caps should be replaced if not done so already

I have not replaced the mains filter cap.
I only got one, assuming that it is C107 - if i look at it it has a strange value accoring to my diagram.
It is a 150uF 385V - if i look in the diagram C107 must be an 220uF 385V?


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Re: hantarex polo 28 problem(s)
« Reply #7 on: November 12, 2018, 05:21:44 pm »
Anoter angle of mains cap

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Re: hantarex polo 28 problem(s)
« Reply #8 on: November 12, 2018, 05:41:09 pm »
150uf is fine, you could use a 220uf if you want- make sure its rated at 300v or more

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Re: hantarex polo 28 problem(s)
« Reply #9 on: November 12, 2018, 07:10:57 pm »
Hi

I just replaced c107 with an 220uf 400v still the same white picture and only b+ at 114V

I will try tomorrow to find R234 and let you kmow. Thanks for your help  :)


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Re: hantarex polo 28 problem(s)
« Reply #10 on: November 13, 2018, 02:48:54 am »
Hi

I have checked R234 it is fine.

Kind regards Per

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Re: hantarex polo 28 problem(s)
« Reply #11 on: November 13, 2018, 04:02:07 am »
not much else causes that white screen, the b+ is critical though you must have at least 130v for it to run, it should be 145v
you will need to sort out this b+ issue first

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Re: hantarex polo 28 problem(s)
« Reply #12 on: November 13, 2018, 04:07:31 am »
not much else causes that white screen, the b+ is critical though you must have at least 130v for it to run, it should be 145v
you will need to sort out this b+ issue first

Hi

OK - Thanks i where not sure witch way to go first, the B+ low or the vertical collapse way :)

I will try to follow this flowchart https://www.dropbox.com/s/ve2osbjl6inq092/POLO.FlowChart.jpg?dl=0
Following the B+ low "way", C112 is already changed, I might check it again just to rule that out, and after that the ZD101


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Re: hantarex polo 28 problem(s)
« Reply #13 on: November 13, 2018, 06:08:17 am »
following the flowchart is ok but quicker option is to do what i suggested in the other polo post, you can use a 40w lamp as a dummy load and isolate pin 3 of flyback to prove b+( lamp to pad of pin 3 and ground)

isolate HOT and then lamp to pin 1 and ground, proves b+ and flyback

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Re: hantarex polo 28 problem(s)
« Reply #14 on: November 14, 2018, 11:23:13 am »
Hi

I have just discovered that on my board a European hantarex polo 28 that the cap C144 is an 2200uf 35V
If i look at the diagram is must be an 1000uf 35V

Can that cause some issues?

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Re: hantarex polo 28 problem(s)
« Reply #15 on: November 14, 2018, 11:26:33 am »
no that would not make any real difference
are you u.s or u.k based?

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Re: hantarex polo 28 problem(s)
« Reply #16 on: November 14, 2018, 11:39:32 am »
Hi

I live in denmark :)
Our mains voltage is 230V.
I have taken a picture of the chassis label

Would it be best to change the cap??


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Re: hantarex polo 28 problem(s)
« Reply #17 on: November 14, 2018, 11:52:18 am »
it will unlikely make any difference, some of these chassis have 2200uf and other have 1000uf- do not know why but i doubt it makes much difference
i was going to say you could send the chassis to me to fix if you were uk based, i fix tons of these

first you have to prove the power supply is operating correctly, you do that by isolating pin 3 of the flyback and adding a 40w lamp across the pad of that pin and ground- the bulb should light and then you read b+, 145vdc.if you cannot get stable b+ or chassis shuts down then the power supply section has a fault


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Re: hantarex polo 28 problem(s)
« Reply #18 on: November 14, 2018, 01:16:11 pm »
Hi

OK super :)

A question when test the power supply, I assume that the chassis needs to be mounted as usual to the monitor in order to test it?

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Re: hantarex polo 28 problem(s)
« Reply #19 on: November 14, 2018, 04:12:03 pm »
you can test the chassis without a tube,do the following
desolder and lift L103 at TP6 side
add 40w lamp to soldered side of L103 and ground(you can use c121 ground)
you can then read the b+ at L103, It should be 145vdc and fully adjustable- don't adjust it too much, try to keep to 145
read +24v at TP8, read +15v at TP9

this will prove power supply voltages

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Re: hantarex polo 28 problem(s)
« Reply #20 on: November 14, 2018, 04:56:53 pm »
Hi

Thanks for the explanation :)
But before I saw you post I have been been changing all the CAP's at the power supply side.

C121
C123
C125
C129
C114
C112
C111
C107
C144
C137

And also C14 at neck board

Now i can adjust the B+, I have set it to 139V BUT now i do not have any neck glow or white picture  :badmood:

SO i have tested the R35 on neck PCB I messure it to 1.5 Ohm.
In the diagram it must be an 0.68Ohm - so can it be my issue now?
I do not have any 0.68 Ohm 1W resistor in my spare parts... so if its that is my issue now I have to order some

I might also check the volts according to your guide :)

Thanks again for your help! :)

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Re: hantarex polo 28 problem(s)
« Reply #21 on: November 14, 2018, 05:24:43 pm »
some chassis have different resistors installed at r35 as its for the heater current, different tubes and all that
highly unlikely your issue

do you have eht?
have you tried adjusting the screen volts?

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Re: hantarex polo 28 problem(s)
« Reply #22 on: November 14, 2018, 05:28:39 pm »
Hi

You are the superman i Polo monitors  :applaud:

Sorry what is an EHT?   :o
If you mean the screen volts as adjusting v.adj - yes but i stoped when i got to 139V

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Re: hantarex polo 28 problem(s)
« Reply #23 on: November 14, 2018, 05:43:15 pm »
eht is the high voltage to the tube- if you static on tube you have eht

screen volts is the brightness control on the flyback(under the focus pot)

i forget how many of these i have repaired but at least 200

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Re: hantarex polo 28 problem(s)
« Reply #24 on: November 14, 2018, 05:52:43 pm »
Oh i will check that eht right away and let you know  ;D

I just discoverd a burned/melted thing next to C175
What is that.. i can't seem to find it in the diagram and the part number has melted away

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Re: hantarex polo 28 problem(s)
« Reply #25 on: November 14, 2018, 06:06:04 pm »
100nf 250v polypropylene, its c176 and that i reckon is your problem as its on the b+ and brightness circuit

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Re: hantarex polo 28 problem(s)
« Reply #26 on: November 14, 2018, 06:11:05 pm »
100nf 250v polypropylene, its c176 and that i reckon is your problem as its on the b+ and brightness circuit

OK then i will have to see if thats dead - and that might be the issue then?
And if ots dead it must be a polypropylene? like this one its not possible to use an ordinary cap

https://www.aliexpress.com/item/MCIGICM-104-100nF-100V-250V-400V-630V-CBB-Polypropylene-film-capacitor-pitch-5mm-7-5mm-10mm/32906354558.html?spm=2114.search0104.3.1.4e4b27caKl1pvC&ws_ab_test=searchweb0_0,searchweb201602_3_10065_10068_319_317_10696_10084_453_10924_454_10083_10618_10920_10921_10304_10307_10922_10820_10821_537_10302_536_10059_10884_10887_100031_321_322_10103,searchweb201603_51,ppcSwitch_0&algo_expid=3f3b6cdf-451c-48b7-b8ad-7d8af0b80cf6-0&algo_pvid=3f3b6cdf-451c-48b7-b8ad-7d8af0b80cf6


I just tried to see if i got eht when turing the screen control up, but no eht  :-[
I have that "stadic cracking sound" when i power the monitor on
I alto adjusted the B+ volt to 145 steady as a rock
« Last Edit: November 14, 2018, 06:14:07 pm by perjmolsen »

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Re: hantarex polo 28 problem(s)
« Reply #27 on: November 14, 2018, 06:15:52 pm »
that cap is dead, probably caused by a bad solder joint and then exploded due to arcing

that crackle is the eht

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Re: hantarex polo 28 problem(s)
« Reply #28 on: November 14, 2018, 06:17:54 pm »
that cap is dead, probably caused by a bad solder joint and then exploded due to arcing

that crackle is the eht

OK :)
it must be a polypropylene? like this one its not possible to use an ordinary cap? just the same values?

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Re: hantarex polo 28 problem(s)
« Reply #29 on: November 14, 2018, 06:28:27 pm »
you can use a polyester film, not a electrolytic
you can get them on ebay easily or if you have any electronic component suppliers in denmark

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Re: hantarex polo 28 problem(s)
« Reply #30 on: November 14, 2018, 06:29:48 pm »
I dug into my boxes with stuff.. and found those  :applaud:

They do not look the same but i think that is poly caps and 100nf 250V that might be a replacement in c176

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Re: hantarex polo 28 problem(s)
« Reply #31 on: November 14, 2018, 06:32:36 pm »
exact same ones i use and from same company

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Re: hantarex polo 28 problem(s)
« Reply #32 on: November 14, 2018, 06:37:13 pm »
 :applaud: super... I am just now heating up de soldering iron... so exiting to see if thats the issue :)

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Re: hantarex polo 28 problem(s)
« Reply #33 on: November 14, 2018, 06:58:33 pm »
CRAP...I had hoped that change C176 did it (the old one where dead)... but

Still the same.. no picture, also tried to turn up screen volt nothing.

Still cracle sound when I power the monitor on, and  B+ 145V
Strange I got white picture before i changed the power side caps, but before i changed them i where unable to get a steady B+ volt...

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Re: hantarex polo 28 problem(s)
« Reply #34 on: November 14, 2018, 07:01:58 pm »
check over your work

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Re: hantarex polo 28 problem(s)
« Reply #35 on: November 14, 2018, 07:16:16 pm »
Hi

Yes i will do that tomorrow.  ;)
I think it is time to bed now

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Re: hantarex polo 28 problem(s)
« Reply #36 on: November 15, 2018, 03:05:44 am »
HI

I just checked the volts

TP6: 145V steady
TP7: Dropping quickly from 48V to 0V
TP8: Where is that test point?
TP9: 16V

So i have to figure out why my TP7 volts is dropping to 0 and where TP8 is...

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Re: hantarex polo 28 problem(s)
« Reply #37 on: November 15, 2018, 03:20:13 am »
tp7 should be 85v, check the polarity of c123 10uf 100v
TP8 is L105, normally its  2.2 ohm resistor, should be about 27v

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Re: hantarex polo 28 problem(s)
« Reply #38 on: November 15, 2018, 03:46:58 am »
the polarity of c123 where OK - The one that i have mounted where an 10uf 160v
Changed it to the old one 10uf 100V

Now i got 12V steady at TP7?  ???

The other ones
TP6: 145V steady
TP8: 25V steady
TP9: 16V steady

Still no raster or neck glow ....

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Re: hantarex polo 28 problem(s)
« Reply #39 on: November 15, 2018, 04:16:09 am »
read b+ on pin 3 of flyback now

  
 

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