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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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ctc169
Usually it's good to start by looking for the things that are misshapen or
smell funny. Other than what you might find at the bar, this means you have to see if any of the caps around the power section (where the cord comes from) are "popped out," or in little pieces like the one that blew up on my old PC's power supply. When a unit doesn't function properly, but works great after you leave it on for awhile, it may indicate the caps are not charging/discharging properly. Most of them will be ok, but you may notice some with more dust around them or heat marks on the board. If you're good at desoldering (or a friend), you may need to remove the caps you're interested in and use a capacitance check out of circuit, which is usually part of a good multimeter these days. I haven't seen the board you're looking at, but the only place to start for this problem is at the power section. Anything that looks overheated or loose is suspect. Good luck anyway wrote in message om... Hi..I have a 52" projection tv, circa 1993...with the ctc169 chassis...on a couple of occasions..having uplugged it...it wouldnt turn back on...A guy I had been freindly with in the biz...said the power supply caps were cashing out, because it had very little standby voltage but later turned on...well...I guess the power went off breifly or something..and now its been dead for days. I can hear it draw power when you pull the cord off it. Can I get any help as to what caps I should be looking at..Im of the understanding caps cant be tested in circuit. I have lost touch with the other tech..and am in a bad position right now to replace the tv..any help would be appreciated |
#2
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ctc169
+15 volt Standby Rectifier Diode, change it!! Then check out the regulator
for poor condition capacitors areound the regulator driver IC. "Jer" wrote in message news Usually it's good to start by looking for the things that are misshapen or smell funny. Other than what you might find at the bar, this means you have to see if any of the caps around the power section (where the cord comes from) are "popped out," or in little pieces like the one that blew up on my old PC's power supply. When a unit doesn't function properly, but works great after you leave it on for awhile, it may indicate the caps are not charging/discharging properly. Most of them will be ok, but you may notice some with more dust around them or heat marks on the board. If you're good at desoldering (or a friend), you may need to remove the caps you're interested in and use a capacitance check out of circuit, which is usually part of a good multimeter these days. I haven't seen the board you're looking at, but the only place to start for this problem is at the power section. Anything that looks overheated or loose is suspect. Good luck anyway wrote in message om... Hi..I have a 52" projection tv, circa 1993...with the ctc169 chassis...on a couple of occasions..having uplugged it...it wouldnt turn back on...A guy I had been freindly with in the biz...said the power supply caps were cashing out, because it had very little standby voltage but later turned on...well...I guess the power went off breifly or something..and now its been dead for days. I can hear it draw power when you pull the cord off it. Can I get any help as to what caps I should be looking at..Im of the understanding caps cant be tested in circuit. I have lost touch with the other tech..and am in a bad position right now to replace the tv..any help would be appreciated |
#3
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ctc169
CR4118 in the ps secondary, caps in the primary of power supply, half a
dozen other things...get this one to a tech that does a lot of them and it should be pretty routine. Someone who is not familiar with them could waste lots of time. Leonard wrote in message om... Hi..I have a 52" projection tv, circa 1993...with the ctc169 chassis...on a couple of occasions..having uplugged it...it wouldnt turn back on...A guy I had been freindly with in the biz...said the power supply caps were cashing out, because it had very little standby voltage but later turned on...well...I guess the power went off breifly or something..and now its been dead for days. I can hear it draw power when you pull the cord off it. Can I get any help as to what caps I should be looking at..Im of the understanding caps cant be tested in circuit. I have lost touch with the other tech..and am in a bad position right now to replace the tv..any help would be appreciated |
#4
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ctc169
On Wed, 24 Mar 2004 06:02:28 -0500, "Leonard Caillouet"
wrote: CR4118 in the ps secondary, caps in the primary of power supply, half a dozen other things...get this one to a tech that does a lot of them and it should be pretty routine. Someone who is not familiar with them could waste lots of time. Leonard ....and one mistake could cause plenty of damage also. Tom wrote in message . com... Hi..I have a 52" projection tv, circa 1993...with the ctc169 chassis...on a couple of occasions..having uplugged it...it wouldnt turn back on...A guy I had been freindly with in the biz...said the power supply caps were cashing out, because it had very little standby voltage but later turned on...well...I guess the power went off breifly or something..and now its been dead for days. I can hear it draw power when you pull the cord off it. Can I get any help as to what caps I should be looking at..Im of the understanding caps cant be tested in circuit. I have lost touch with the other tech..and am in a bad position right now to replace the tv..any help would be appreciated |
#5
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ctc169
says in da message in da
phuck'n group sci.electronics.repair: Hi..I have a 52" projection tv, circa 1993...with the ctc169 chassis...on a couple of occasions..having uplugged it...it wouldnt turn back on...A guy I had been freindly with in the biz...said the power supply caps were cashing out, because it had very little standby voltage but later turned on...well...I guess the power went off breifly or something..and now its been dead for days. I can hear it draw power when you pull the cord off it. Can I get any help as to what caps I should be looking at..Im of the understanding caps cant be tested in circuit. I have lost touch with the other tech..and am in a bad position right now to replace the tv..any help would be appreciated To test capacitors you need an ESR (Equivalent Series Resistance) meter. And if there are capacitors that look damaged you should obviously replace them. Visual inspection can help, plus some testing at caps in the SMPS area. -- _____ ___ Chaos Master® | | Posting from Brazil | | MSN: wizard_of_yendor at hotmail.com ___|_____| irc.brasnet.org #XLinuxNews #POA |
#6
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ctc169
Completely rebuid the SMPS
and whilst in there change the Blue Box caps and diodes. Then good to go.. kip -- "Watch the return E-Mail addy its false" wrote in message om... Hi..I have a 52" projection tv, circa 1993...with the ctc169 chassis...on a couple of occasions..having uplugged it...it wouldnt turn back on...A guy I had been freindly with in the biz...said the power supply caps were cashing out, because it had very little standby voltage but later turned on...well...I guess the power went off breifly or something..and now its been dead for days. I can hear it draw power when you pull the cord off it. Can I get any help as to what caps I should be looking at..Im of the understanding caps cant be tested in circuit. I have lost touch with the other tech..and am in a bad position right now to replace the tv..any help would be appreciated |
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