Tanong ko lang po, maaayos pa ba and computer monitor ko na pag power up ay isang horizontal line sa gitna and umiilaw about 3 to 5 mm ang width? Kung yes mga magkano at ano ang probable na sira. Para kung pinagawa ko hindi ako tatagain. Is it better to buy surplus na lang? Thanks
Re: Computer Monitor Problem
yes, vertical IC ang problema, don't know how much, kasi don't know what kind. if you know how to use a soldering iron i can work you out, normally di mataas ang cost of repairing sa monitor kasi mura lang ang surplus, est. between 500 to 1000, more than 1000 better get a surplus, but if your monitor is 15" above and a good brand, repair na lang
Re: Computer Monitor Problem
IMO, if the cost of repair would cost around what sir Boboy had mentioned (<= 1K), you might want to consider getting a surplus set. But if it would be more than that, you might want to consider getting a new one instead. Redfox has a very good 15" CRT monitor for around 3.3K only. LG ha a 17" flatron CRT for around 4.3K.
Re: Computer Monitor Problem
boboy is right, one or more pins of the vertical IC has probably a cold solder connection. if you know how to use a soldering iron and you can locate the IC on the board (it's usually connected to a small heatsink) you can DIY. good luck!
Lipad Bentot! Lipppaaadddd!!!!
Re: Computer Monitor Problem
I am handy with a soldering iron. T think that it is just a cold solder. Come to think of it my son used to jerk (pukpok) the monitor and sometimes it goes back to life. Now ayaw na. The problem is locating it. Any clue aside from having a heat sink? Thanks po sa lahat ng advice
Re: Computer Monitor Problem
I have 2 busted monitors and both of them have vertical ic starting with TDA (TDA9302 & TDA4866). They are both single in line packaged (one row of pins, 8 & 9 pins)One is attached to it's own heatsink with alternating pins bent while the other is to a large heatsink along with other transistors. HTH!!! but this may not necessarily apply in your case. 🙂
Lipad Bentot! Lipppaaadddd!!!!
Re: Computer Monitor Problem
Guys,
You are absolutely correct! I was able to fix the monitor last night. I opened the case, and looked for the cold solder. I was able to find a small black squareish device with three pins (transistor?) that easily moved when lightly pushed. To my surprise, all three leads were detached from the board but still managed to be electrically connected. I soldered it and voila! monitor works.
Thanks to you guys. If it weren't for this, I might have sent this to repair shop and maybe get taga! How much did it cost? 1 hour and a few millimeters of soldering lead and a few milliwatthours of electricity.
You guys are great. Thanks again
Re: Computer Monitor Problem
Congrats Tatoski. Why electronic repair can sometimes be so fulfilling. But at times really frustrating when you cannot find the source of the problem. Sometimes, using the senses is better than testing: sight, smell, touch.
Re: Computer Monitor Problem
Guys,
You know what? The monitor did not work again. Same problem. I appears that what I repaired was not causing it. Anyway I tried looking for the IC and with a lot of luck found it! It was a 9 pin IC with a heavy heat sink. And true to the suspicion of a cold solder, found 6 pins that had poor connection. The solder lifted off the board. Got my soldering iron and soldered away carefully. Now the monitor is working! Thanks again guys.
Re: Computer Monitor Problem
Probably, after soldering in that transistor and you powered up, it worked fine then when the IC warmed up & overheated due to the bad connexion, it failed again.
You are lucky Tatoski. Thing is, if some solder points are bad, then perhaps the others could also be marginal. I hope you looked at the other components.
If something comes bad again, then you already know what to do.
BTW, you do know that a CRT has some nasty high voltages so you have to be very very careful, I'd be, even if it is not plugged in. In and around the flyback circuitry at the pointy base of the CRT tube I am told.
Cheers, 🙂
Re: Computer Monitor Problem
Yes I know that CRTs have high voltages. But I did not know that it still exists even unplugged. I'll be more careful next time. So how does one release the residual current or voltage? short the leads of the plug? Thanks
Re: Computer Monitor Problem
Only capacitors can store charges in any significant amount. Just wait a few minutes for the voltages to drop. If in doubt, measure voltages across the capacitors. These are the big round or rectangular things with two legs.
Re: Computer Monitor Problem
Only capacitors can store charges in any significant amount. Just wait a few minutes for the voltages to drop. If in doubt, measure voltages across the capacitors. These are the big round or rectangular things with two legs.
+1 on this.
Re: Computer Monitor Problem
normally may naiwan na small voltage, it will discharge by itself when your power switch is on, (unpluged ha!), it is not advisable to discharge this voltage cause it will affect sensitive parts specially IC's due to power surge. the technique is to discharge it using a dumy load
Re: Computer Monitor Problem
Question one more time. My monitor (the same one) display is small. Instead of displaying full screen, the screen is very narrow vertically meaning the display does not reach the left and right side of the screen. And the color is monochromatic. Is it time to buy a new one. Is LCD better? How much is a medium end LCD 17". Thanks
