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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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F32665 CTC203 RCA TV Dead
Hope someone can help me! I've got a 4 year TV that went dead when I went on vacation last year.
I already bought another one, so this is a project for me since I have electronics experience. When I push the power button (or remote), the TV tries to cycle on (3 times) then it stops trying. Looking at previous posts, this one looks original. I don't have a chipper checker. I can't get the set to come up using the power, setup ... sequence. I have checked resistors, they seem to be ok. Diodes are checking out good. Transistors are looking pretty good. I'm getting 168.8VDC at CR14203/CR14201 when I'm supposed to be reading approx 156V. That seems to be driving all my other voltages high. I think it could be a transformer but I'm not sure. Also, I did get a SAMS Photosheet so I have a schematic in front of me. Thanks for the help Larry |
#2
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Check for dry joints in horizontal sections !!!!!
Also check for s/c diodes ... kip "larmo22" wrote in message ... Hope someone can help me! I've got a 4 year TV that went dead when I went on vacation last year. I already bought another one, so this is a project for me since I have electronics experience. When I push the power button (or remote), the TV tries to cycle on (3 times) then it stops trying. Looking at previous posts, this one looks original. I don't have a chipper checker. I can't get the set to come up using the power, setup ... sequence. I have checked resistors, they seem to be ok. Diodes are checking out good. Transistors are looking pretty good. I'm getting 168.8VDC at CR14203/CR14201 when I'm supposed to be reading approx 156V. That seems to be driving all my other voltages high. I think it could be a transformer but I'm not sure. Also, I did get a SAMS Photosheet so I have a schematic in front of me. Thanks for the help Larry -- larmo22 |
#3
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Extra volts at the diodes you are looking at has nothing to do with
your problem, the voltage you are reading is purely a function of your AC voltage from the wall. What you need to check mainly to start is your DC voltage on the 130v supply at CR14106. It may be 140v or more with set off but should immediately drop to 130v when the set is turned on. If it's too high when the set is turned on, the set will turn itself off. If this is the case check voltage at CR14704 off the flyback when the set is turned on. If you're missing this 14v supply from a bad diode this problem can happen. |
#4
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L14401 at base of H_Output. Remove it, clean up the glue, reinstall it after
throughly cleaning the leads and the solder pads, ring the LOPT. "RonKZ650" wrote in message ps.com... Extra volts at the diodes you are looking at has nothing to do with your problem, the voltage you are reading is purely a function of your AC voltage from the wall. What you need to check mainly to start is your DC voltage on the 130v supply at CR14106. It may be 140v or more with set off but should immediately drop to 130v when the set is turned on. If it's too high when the set is turned on, the set will turn itself off. If this is the case check voltage at CR14704 off the flyback when the set is turned on. If you're missing this 14v supply from a bad diode this problem can happen. |
#5
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If previos posts don't do the trick, see if your version of the chassis has
the external video jacks mounted to a daughter board that has a three terminal regulator with a small heat sink mounted at the rear top corner of the board. If it does, check for a cracked solder joint on one of the surface mount resistors in this regulator circuit. Very hard to see, might pay to "shotgun solder" all the SMT resistors in this area. Usually the board has to be removed for good access. good luck, Tom "Art" wrote in message ... L14401 at base of H_Output. Remove it, clean up the glue, reinstall it after throughly cleaning the leads and the solder pads, ring the LOPT. "RonKZ650" wrote in message ps.com... Extra volts at the diodes you are looking at has nothing to do with your problem, the voltage you are reading is purely a function of your AC voltage from the wall. What you need to check mainly to start is your DC voltage on the 130v supply at CR14106. It may be 140v or more with set off but should immediately drop to 130v when the set is turned on. If it's too high when the set is turned on, the set will turn itself off. If this is the case check voltage at CR14704 off the flyback when the set is turned on. If you're missing this 14v supply from a bad diode this problem can happen. |
#6
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well, doing my troubleshooting, i accidently shorted out something and my fuse blew. off to the shop i go. thanks everyone for their input so far!
Larry Quote:
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#7
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I like it.!!!
Don't forget to tell the repair shop you screwed it up. kip "larmo22" wrote in message ... well, doing my troubleshooting, i accidently shorted out something and my fuse blew. off to the shop i go. thanks everyone for their input so far! Larry RonKZ650 Wrote: Extra volts at the diodes you are looking at has nothing to do with your problem, the voltage you are reading is purely a function of your AC voltage from the wall. What you need to check mainly to start is your DC voltage on the 130v supply at CR14106. It may be 140v or more with set off but should immediately drop to 130v when the set is turned on. If it's too high when the set is turned on, the set will turn itself off. If this is the case check voltage at CR14704 off the flyback when the set is turned on. If you're missing this 14v supply from a bad diode this problem can happen. -- larmo22 |
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