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MODEL VM-905C HAS 2 PROBLEMS. lvps[WITH BAD CAPS] CAUSES PWR LIGHT TO FLASH. sWAPPED WITH GOOD SPARE, NOW NO HV OR CRT FILAMENTS??

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I BOUGHT A PAC MAN MACHINE THAT THE MONITOR STOPPED WORKING ON. EVERYTHING ON THE MACHINE WORKS EXCEPT i CAN'T SEE ANYTHING ON THE TUBE. I WOULD LIKE TO FIX MY MACHINE


If this is a CRT type of arcade video game, it most likely uses an old-school flyback transformer, and a bunch of electrolytic capacitors. Check for cold or dry solder joints on all the boards (with the unit unplugged), and retouch any suspicious ones; especially the pins on the flyback, the CRT neck board/socket (if applicable) and in the power supply sections, where heat may be generated. Also check to see if the filaments light up in the CRT neck. It's also a good idea to check the caps in the power, horizontal and video sections as well - look for bulging or ruptured electrolytics, and/or burned resistors. Some arcade games (e.g. Asteroids) use a HV diode rated at around 25-30kV (it is located near the flyback and may have an insulated plug at each end). These can crack, short or simply go open circuit producing a "no display" symptom. If your game has this, check it before condemning the flyback or caps (the diode also doubles as a HV fuse). Do all the basic checks/visual inspections that you can thoroughly first before going any further with repair and/or restoration. It could be something really simple and easy to fix and/or obtain parts for (at reasonable cost if necessary).

Dec 29, 2013 | Arcade Toys

1 Answer

Rca D61W20 52 in power supply


If the deflection power board was changed with a known good one . then the HV splitter block would be suspect then followed by a bad CRT next. I would try removing one CRT drive board at a time by letting it hang free wires attached then trying to power up the set if it doesnt power up then try one of the other crt drive boards after reattaching the one you previously unhooked. If the set powers up if any certain CRT board is removed you will know the problem is that CRT. If it doesnt power up then its most likely the HV splitter. You can get replacement CRTs, boards and HV splitters that have warranties from www.tvrepairworld.com

Jan 22, 2012 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

HI, my JVC AV-48wp30 has the same symptoms as other posts here. Powers on with no screen, HV, and no CRT heater coils light up. Thumping sound in speakers, and then shuts off. Blue light flashes. ...


take off the front panel and unplug the convergance board up front just behinf panel if the set now comes on replace your con amps if not you have a power supply issue more than likly the con amps are bad

Nov 20, 2009 | JVC AV-48WP30 48" Rear Projection...

2 Answers

LT 30 HV Olevia Syntax No picture - blue flash


Ur video converter board is dead.
Need to be change.

Aug 15, 2009 | Insignia 37" LCD Flat-Panel HDTV

1 Answer

Lcd tv turns off after 5 mins, leave 2 mins comes on to stand by


Swollen ( bad ) caps in power supply first place to look.............T.

Dec 17, 2008 | Samsung DLP HL-P5663W 56" TV

1 Answer

Philips DPTV335


Ed,
That chassis has a couple of problems I'd check first before writting it off as a bad crt... The vertical Ic can cause the problems you're experiencing. In that unit it's a TDA8177 (vertical Ic) and if it fails you'll find no 10v supply to the HV generator - thus no HV to light the cans. Could also be the HV generator module itself, but more likely vertical Ic before suspecting the HV module. If you hav a dmm you could measure the voltage on pins 7 & 8 or pins 1 & 2 on the HV plug. If you have nothing there it's the generator - if not highly suspect the vertical.
To answer your question - if the blue can were bad red & green would still light depending on the internal short. If all three are out I'd suspect a loss of HV (high voltage) or B+ as it's referenced.
Good Luck!
Bill

Oct 13, 2008 | Philips Magnavox MWR10D6 DVD Recorder

1 Answer

Hitachi 43FDX10B Power problem


Below is a few possible causes along with verified cures.

Symptom:
Intermittent shut off
Cause: Check auto link and 4 event timer. redress cabling from front control panel away from blue crt-yoke-hv lead

Symptom: NO PIC OR OSD, PWR LITE COMES ON
Cause: CHECK C603 LEAKY

Symptom: shutdown
Cause: T701


Billy

Jan 23, 2008 | Hitachi FDX Series 43FDX10B 43" Rear...

1 Answer

UNIT IS DEAD.


believe are the two caps., beside the large H.V. transformer? Just replace the two capacitors and should be fine, I have this problem before. Now as far as open neutral there maybe other damage to the set.

Nov 22, 2007 | Zenith Z27A11G 27" TV

1 Answer

Video blacking out...


Changing all the caps is not the right approach to problem solving.Works cold,but fails after hot is a thermal issue.After set warms up and fails,use cool freeze spray on suspect components to isolate.Determine whether CRT filaments are lit and/or if HV is present.Also,inspect jumper wire from transformer to HV block-if corroded,replace jumper HV lead & HV block w/Mits. parts.

Sep 26, 2007 | Mitsubishi WS-65869 65" Rear Projection...

1 Answer

UNIT IS DEAD.


Reverse Phase Can do that on Ac expecially when the Cable is Connected,Replace both Caps and Ck the MOV also the full wave Bridge 4 Diodes and Fuse should restore Full Operation Good luck ttech

Jul 24, 2007 | Zenith B32A24Z 32" TV

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