Main > Monitor/Video Forum
Pentranic 1132 (CH-288) No Picture & Chirping - [FIXED!!!!!!]
gokun:
Ok, so I got all my parts in and here is what I replaced...
all the caps on the board and neckboard...
the HOT....
the vert ic...
the horz/vert osc ic thiingy...
cleaned up any questionable solder points...
Alas, I still get the the same problem....chirp chirp chirp chirp chirp....starts slow then picks up to regular pattern....no neck glow, etc....all the same symptoms....guess I should consider myself lucky it didn't explode what with this being my first real attempt at a complex (for me) monitor repair...sigh...
so what does that leave? The flyback and yoke?
And if that is the case, I'm feeling that could make it a lot more trouble than it is worth considering I can't even find the flyback for sale anywhere...jeez...isn't my luck just grand? ;)
so anyways, any more ideas here or am i totally screwed on this one?
thanks again!
Arm123:
you should check out my thread, sounds like we have the same problem. :'(
gokun:
I actually did read it...but mine is a definate chirping(like you would imagine a baby chic would make) and nothing ever burned. It literally worked one minute and not the next....sigh...but nonetheless I suppose they do sound somewhat related at the least...well, here is something I am just reading myself so take it with a grain of salt, however it comes from a good source....I'm going to paraphrase rather than quote because I'm pretty sure the author doesn't want his exact info(and all the details) posted and I don't want to disrespect someone trying to help me after all...so basically this is as detailed an explanation of what I'm reading as I'm allowed to give publicly...that being said...
in a nutshell, it says, r513 can often cause our symptoms(and a lot of others) due to B+ circuit going into over voltage....which not ironically is what some of the fellows here have implied to both of us...we are advised to change it out for a metal film one of at least 600mw or higher...
my own theory right this second(and bare in mind I'm still reading the new article and there is LOTS of info for me to still read)...is that I definately think it's in that stupid safety reset mode or whatever the hell it's called...both because of what I've read and what the guys here tell me....well, apparently there are only so many things that typically cause that to happen(most of which you and I have already replaced with the help of the guys here)...so since I can understand it's an overvoltage at this point, and this is apparently one of the common causes, I'm willing to try it and will let you know the results...but I have to order the part(all the shops around my area SUCK) so if you get a chance to test it out first please let me know the results as it will be at least a week before the part comes in for me...I really want to learn how to do this...REALLY bad...anyways, I will definately let you know if I find a solution as long as you promise to do the same for me. Sound fair? :)
Arm123:
Yup... Ill be posting my results this weekend. I only have the chassis sitting here. The tube and cabinet are about 40 miles away and ill be going there this Sat.
Ill make sure to fill you in on my results. (fingers crossed) ;D
Bad Man:
On a small sub board that is attached to the heat sink there are two capacitors that can cause that problem C511 and C512.
Good Luck .......