Home |
Search |
Today's Posts |
|
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. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to sci.electronics.repair
|
|||
|
|||
Substitutes for this TV thermistor?
Hello
I need a replacement for this thermistor, here are the markings: T(thunder symbol)9 MZ73BLL 9RM Data sheet (see page 7): http://www.ancol.cn/upload/20078316361776520.pdf TV set I'm trying to fix: Roadstar CTV 2050 Data sheet: http://www.sendspace.com/file/8wvt88 Chassis model VE01-20 THM Chassis # LY12867 Could someone please write a list of suitable replacements? Thank you. |
#2
Posted to sci.electronics.repair
|
|||
|
|||
Substitutes for this TV thermistor?
On Wed, 16 May 2012 06:29:55 -0700 (PDT), Goldfish
put finger to keyboard and composed: Hello I need a replacement for this thermistor, here are the markings: T(thunder symbol)9 MZ73BLL 9RM Data sheet (see page 7): http://www.ancol.cn/upload/20078316361776520.pdf That looks like a typical 9 ohm degaussing resistor. Just about any 3-pin PTC degaussing resistor should do. For example, Murata makes popular replacements, eg PTH451C9R0Q21: http://www.paulswan.me/arcade/datasheets/PTH451C.pdf - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#3
Posted to sci.electronics.repair
|
|||
|
|||
Substitutes for this TV thermistor?
"Franc Zabkar" wrote in message ... On Wed, 16 May 2012 06:29:55 -0700 (PDT), Goldfish put finger to keyboard and composed: Hello I need a replacement for this thermistor, here are the markings: T(thunder symbol)9 MZ73BLL 9RM Data sheet (see page 7): http://www.ancol.cn/upload/20078316361776520.pdf That looks like a typical 9 ohm degaussing resistor. Just about any 3-pin PTC degaussing resistor should do. Er..... not quite! The most common type has 2x PTC pellet - one of which is directly across the incoming mains after the switch, this heats the degauss pellet to cut off any residual current that would cause picture shimmer. Some makes (notably Philips) sometimes use a PTC/NTC combination - the NTC; as you would expect is in series with the mains to the rectifier, where it serves the dual role of limiting inrush surge and using the current drawn for heating to raise the PTC above residual current. Putting a PTC/NTC combination in place of a 2x PTC is likely to result in vapourised PCB tracks and welded switch contacts. If you've salvaged your replacement degauss resistor from a scrap set; you can trace the circuit before binning the board - or you can measure the resistance of both thermistors, then heat the middle pin with the soldering iron for a minute or two and check that both resistances increase. |
#4
Posted to sci.electronics.repair
|
|||
|
|||
Substitutes for this TV thermistor?
On May 17, 10:47*am, "Ian Field"
wrote: "Franc Zabkar" wrote in message ... On Wed, 16 May 2012 06:29:55 -0700 (PDT), Goldfish put finger to keyboard and composed: Hello I need a replacement for this thermistor, here are the markings: T(thunder symbol)9 MZ73BLL 9RM Data sheet (see page 7): http://www.ancol.cn/upload/20078316361776520.pdf That looks like a typical 9 ohm degaussing resistor. Just about any 3-pin PTC degaussing resistor should do. Er..... not quite! The most common type has 2x PTC pellet - one of which is directly across the incoming mains after the switch, this heats the degauss pellet to cut off any residual current that would cause picture shimmer. Some makes (notably Philips) sometimes use a PTC/NTC combination - the NTC; as you would expect is in series with the mains to the rectifier, where it serves the dual role of limiting inrush surge and using the current drawn for heating to raise the PTC above residual current. Putting a PTC/NTC combination in place of a 2x PTC is likely to result in vapourised PCB tracks and welded switch contacts. If you've salvaged your replacement degauss resistor from a scrap set; you can trace the circuit before binning the board - or you can measure the resistance of both thermistors, then heat the middle pin with the soldering iron for a minute or two and check that both resistances increase. I'm sorry but I have to ask the obvious question. Why not try to get the OEM part? Lenny |
#5
Posted to sci.electronics.repair
|
|||
|
|||
Substitutes for this TV thermistor?
"klem kedidelhopper" wrote in message ... On May 17, 10:47 am, "Ian Field" wrote: "Franc Zabkar" wrote in message ... On Wed, 16 May 2012 06:29:55 -0700 (PDT), Goldfish put finger to keyboard and composed: Hello I need a replacement for this thermistor, here are the markings: T(thunder symbol)9 MZ73BLL 9RM Data sheet (see page 7): http://www.ancol.cn/upload/20078316361776520.pdf That looks like a typical 9 ohm degaussing resistor. Just about any 3-pin PTC degaussing resistor should do. Er..... not quite! The most common type has 2x PTC pellet - one of which is directly across the incoming mains after the switch, this heats the degauss pellet to cut off any residual current that would cause picture shimmer. Some makes (notably Philips) sometimes use a PTC/NTC combination - the NTC; as you would expect is in series with the mains to the rectifier, where it serves the dual role of limiting inrush surge and using the current drawn for heating to raise the PTC above residual current. Putting a PTC/NTC combination in place of a 2x PTC is likely to result in vapourised PCB tracks and welded switch contacts. If you've salvaged your replacement degauss resistor from a scrap set; you can trace the circuit before binning the board - or you can measure the resistance of both thermistors, then heat the middle pin with the soldering iron for a minute or two and check that both resistances increase. I'm sorry but I have to ask the obvious question. Why not try to get the OEM part? Lenny vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv Might cost more than the value of an old CRT telly to do so. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
2SA1065/2SD2489 substitutes | Electronics Repair | |||
chip-quik substitutes? | Electronics Repair | |||
Crush Washers for Oil Pan - Substitutes? | Metalworking | |||
transistor substitutes | Electronics Repair | |||
mica capacitor substitutes | Electronics Repair |