New Life Games LLC

Monitor Repair Log and Database. **Arcade and Gaming** => LCD and CRT Monitor Repair Tech Support => Topic started by: hairy otter on April 29, 2014, 10:43:48 AM

Title: vertical collapse?
Post by: hairy otter on April 29, 2014, 10:43:48 AM

I have a Hantarex MTC9110 with, what I think, a vertical collapse problem.

Here is a video of what is on screen, during this video I try to adjust all pot's (V Amp, V Freq etc.): But at best there is a very bright line in the center of the screen and the bottom part of the video below that.
(https://newlifegames.com/nlg/proxy.php?request=http%3A%2F%2Fi1.ytimg.com%2Fvi%2F_Sl07ohx160%2Fmqdefault.jpg&hash=60b1f41fcfec0bb4fcf155cb849e9b44b0a7e80e)
Video (https://www.youtube.com/watch?v=_Sl07ohx160)


I've already replaced IC1 (TDA1670A) and the capacitors as suggested by Randy Fromm's flowchart (http://gc339.free.fr/NoticesMoniteurs/Hantarex/MTC9000/MTC%209000.FlowChart.jpg). (C9, C14, C15, C57 and R46)
But with no solution.


I checked the waveforms on TP3 and TP4 with folowing results:


(https://i1.ytimg.com/vi/XK59Jb-ncaA/mqdefault.jpg)
Video TP3 (https://www.youtube.com/watch?v=XK59Jb-ncaA)


(https://i1.ytimg.com/vi/L_97oOvRIDA/mqdefault.jpg)
Video TP4 (https://www.youtube.com/watch?v=L_97oOvRIDA)


Could a full re-cap be usefull or is there something else wrong?


Thanks in advance. Hairy Otter

Title: Re: vertical collapse?
Post by: cowboygames on April 29, 2014, 04:47:47 PM

I am not familiar with that particular chassis. What is the TDA1671? It doesn't cross in my ECG guide. Have you checked/replaced your vertical output IC? Checked the resistors that feed it?

Title: Re: vertical collapse?
Post by: hairy otter on April 30, 2014, 05:53:21 AM

Quote from: cowboygames on April 29, 2014, 04:47:47 PM

I am not familiar with that particular chassis. What is the TDA1671? It doesn't cross in my ECG guide. Have you checked/replaced your vertical output IC? Checked the resistors that feed it?

My bad, I have changed the TDA1670A (instead of the TDA1671) which is the vertical deflection IC.
Here is the Manual: Link (https://ia700603.us.archive.org/13/items/ArcadeGameManualMtc9110/mtc9110.pdf)


If I look at TP4 it seems that only the bottom half of the waveform is correct, compared to the picture on page 15 of the pdf (https://ia600603.us.archive.org/13/items/ArcadeGameManualMtc9110/mtc9110_text.pdf). On the monitor I also see only the bottom half of the screen, the top stays collapsed.
TP3 looks nothing like in the manual?