Main > Monitor/Video Forum
D9200 out :(
Madman:
Ok, I am a bit closer...
The set now powers with a picture but my horizontal is stuck at around 5 inches or so... everything else seems fine colors are good and the image is stable...
I have control over all perimeters but horizontal is just small......
could Q411 cause this? can IC 404?
Thoughts?
Thanks!
Madman:
It lives.......
Thanks for everyone's help!
I'll post up the sequence of events for the next person that lucky enough to attempt repair of one of these.... i am tired for now...
Ken Layton:
Glad you got it running. This model can be very time-consuming to repair.
Madman:
Thanks ken....I have about 3 1/2 solid hours in it... I thought about having WG do it but figured I better learn myself if they are problematic.
Here's the log:
1.) It was dead (faint click)<<< must have been degauss relay not fully powering
2.) checked the following items: (and replaced JUST in case)
(REPLACED)Q401 TRSTR NPN KSC1845-F 086X0385-001
(REPLACED)Q425 TRSTR NPN 2SC4770 086X0392-001 NTE2324
(REPLACED)Q418 TRSTR NPN 2SC5144 (TOSHIBA)
(REPLACED)413 FET IRF644A
(REPLACED)414 FET 2N7000
(REPLACED)d424 DIODE 1N4148
3.) Checked power supply and found R804 to be open and replaced it
3.) Set then powered on for a sec and when into protection (click, click, click)
4.) Realized I forgot to check D417
5.) D417 was shorted so I replaced it.
6.) I found that powering the set with D417 shorted and R804 replaced caused R854, R462 and Q413 to be damaged.
7.) After replacing the above the set powered on with a 5 inch horizontal...
8.) After going over the unit again I decided to pull Q414 and compare with a new and found it to be bad as well.
9.) After replacing Q414 again...set then powers on fine.
I have learned a lot from this repair and expect WHEN it happens next time to cut the repair time in half and hopefully replace only the parts needed.
I also bought a capkit but have not used it yet... I did check a few caps here and there as per the suggestions but found nothing close to bad... This makes sense as the set has less than 50 hours on it..
The other thing that made this difficult is I did not remove the tube from the cabinet as it is a royal pain to do so and I am lazy.... I basically troubleshooted it un-powered... I fully realize this is NOT the best and most efficient way to do it but hey... I got lucky!
Thanks for the help!
VidEng:
Thank you for posting your troubleshooting experience.
My D9402 went out too, and after reading your post I checked R804 and it was open. I'm replacing it with a higher-wattage version; hopefully it can take the strain better.
I am using it in a MAME machine and while the PC boots up, it goes through a lot of different display modes which makes the monitor re-adjust itself and there is a lot of relay clicking and such. I'm putting in a time-delay relay to make the monitor power up after the PC has been on for 20 seconds. Might reduce wear and tear on the monitor.
-James