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Author Topic: Hantarex Polo 25 ticking with neck glow  (Read 913 times)

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retrocat

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Hantarex Polo 25 ticking with neck glow
« on: December 06, 2019, 08:29:55 am »
I have a hantarex polo 25 that is ticking. searching for similar issues online, it seems like everyone with ticking has no neck glow, but i get neck glow each time it ticks. does anyone know what could cause this condition?
the monitor was working previously, with picture issues. i replaced all electrolytic capacitors, flyback, and HOT, and it looked great and ran for some time. since the ticking started, i've since replaced the voltage regulator, and following the polo flowchart, replaced the HV caps c170, c172, c174, c175, and diodes d129, d135, with no luck. i found a bad trace on one of the flyback pins as well, and have soldered a jumper wire. everything from the flowchart checks out as far as i can tell, though i don't know how to test the flyback.. reading the b+ i get ~30V and each time it ticks/neck glows it jumps up ~70V.

thanks in advance for any info or guidance, i have been working on this thing for weeks and its driving me mad :(

« Last Edit: December 12, 2019, 09:16:31 pm by retrocat »

grantspain

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #1 on: December 07, 2019, 05:33:32 am »
so basically the horizontal deflection is not running

desolder centre pin of the T114 and add a 40w lamp to the track of the centre pin and ground, check all voltages  145vdc b+, 26vdc, 16vdc at power supply section test points and 12v at tp10

if all correct check T114 out of circuit, then report findings

it actually sounds like a broken track somewhere as you have heaters

retrocat

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #2 on: December 08, 2019, 12:02:14 am »
i desoldered the center HOT pin, and connected the lightbulb.
when i plugged in the chassis, the bulb lit up, but R255 got really hot and started smoking, so i unplugged it..
does this indicate anything?

grantspain

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #3 on: December 08, 2019, 03:55:01 am »
r255 is 100 ohm metal oxide, check d142, ic103

retrocat

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #4 on: December 08, 2019, 04:42:49 pm »
this R255 is 125 ohm carbon film. i'll order the correct one.
D142 tests ok.
how can i test ic103?

retrocat

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #5 on: December 09, 2019, 07:36:31 pm »
i ordered a replacement IC103 tda1675a
i'll update when i get it installed
also, HOT tests okay, and i have 2 spares, both of which i have tried with no luck.
one of the pins on the flyback (i think its pin 8?) is missing the pad, but there is no trace to it. this is okay right?
« Last Edit: December 09, 2019, 07:40:19 pm by retrocat »

grantspain

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #6 on: December 10, 2019, 02:41:10 am »
yes pin 8 does not have a track

retrocat

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #7 on: December 12, 2019, 09:15:19 pm »
replacement IC103 tda1675a came in
swapped it out
hooked up the light bulb again on desoldered HOT center pin trace and R255 didn't get hot this time
TP1 had 157V
TP2... i touched the wrong way somehow with my multimeter and T101 blew up..... :banghead:
so i've ordered buz90a to replace T101 with
« Last Edit: December 12, 2019, 09:35:48 pm by retrocat »

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #8 on: December 13, 2019, 02:01:53 am »
you will need to check all the diodes and a few resistors around t101 now

retrocat

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #9 on: January 24, 2020, 07:00:36 pm »
i replaced T101.
no more ticking or neck glow,
now b+ is too high (172)
cant find any bad traces or anything wrong with flyback.

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #10 on: January 25, 2020, 03:56:01 am »
open circuit in horizontal deflection, could be an open circuit resistor or broken track or the coil you put in is open circuit
did you fit a new flyback?

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #11 on: January 26, 2020, 02:47:52 pm »
yeah, this has a new flyback

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #12 on: January 26, 2020, 03:52:56 pm »
so much to look at, it will be either open circuit resistor or broken track or short in horizontal deflection circuit

perjmolsen

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #13 on: January 27, 2020, 07:42:31 pm »
HI  :cheers:

Im a newbee, trying to learn from the masters on this forum  8)

Still I might have a tip

Try to check TH102 (the coil in front of the flyback) - I have two chassis where TH102 had a broken wire, that caused B+ to go high when flyback where connected.

See my test and fix of TH102 here http://forum.arcadecontrols.com/index.php/topic,161614.0.html#lastPost
« Last Edit: January 27, 2020, 07:46:45 pm by perjmolsen »

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #14 on: February 04, 2020, 08:30:16 pm »
HI  :cheers:

Im a newbee, trying to learn from the masters on this forum  8)

Still I might have a tip

Try to check TH102 (the coil in front of the flyback) - I have two chassis where TH102 had a broken wire, that caused B+ to go high when flyback where connected.

See my test and fix of TH102 here http://forum.arcadecontrols.com/index.php/topic,161614.0.html#lastPost

i saw your post before while troubleshooting and did check th102. it isn't faulty.

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #15 on: February 05, 2020, 04:03:10 am »
Hi

I also have had an issue with high b+ due to a bad solder connection in the PSU part.
I fixed it by re solder all the components in the PSU selection, then my B+ where back to normal.
As I recall it where the two big resistors in the psu part where one of them had a bad/cold connection to the PCB and it where really hard to see.

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #16 on: February 17, 2020, 08:50:05 am »
thanks. i'll try to reflow the solder and see how it goes.

i got another chassis that is doing the same thing when connected to this tube (the neck flashing in the video in the first post). does this indicate a tube problem? is there a way i can test the tube to know its ok?

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Re: Hantarex Polo 25 ticking with neck glow
« Reply #17 on: February 17, 2020, 09:15:12 am »
tube has gone to air, in other words its knackered