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
|
|||
|
|||
Magnavox TV TP2770C101 ch 27B502 HV Problem
Hi,
I have a Magnavox TV chassis 27B502-00AA in my shop. I replaced the H.O.T. Q503 # 610597 (on device) which was shorted and the horiz. driver Q500 BSN274 # 483513047931 which was bad. I checked the regulated B+ which is 131.8V (130V is ideal). The HV measures 30KV when it should be 27KV - 28KV. Note: It can't be due to 1.8V high B+ since math shows an increase of about 400V (HV). I checked the FBT core and it isn't loose. Did you have this experience and what was the cause? Thanks in advance, Brad Tip for your old computer (reduce discard pollution too): If you can't sell your old computer, don't throw it away. Use it to backup your software by transferring files/folders from your new computer or laptop to it. I transferred my Windows folder and other stuff to my old computer using "PC Link", which I downloaded from www.simtel.net (cool site). http://www.simtel.net/pub/dl/52792.html (info or download) |
#3
|
|||
|
|||
Magnavox TV TP2770C101 ch 27B502 HV Problem
"Brad Petria" bravely wrote to "All" (22 Sep 03 16:54:00)
--- on the heady topic of "Magnavox TV TP2770C101 ch 27B502 HV Problem" Check the pulse to the HOT base is properly shaped from the horizontal oscillator onwards and nicely clipped at the base. Check the peak shaping network across the HOT's collector isn't open. Check the damping diode if a separate one is used. HV will also rise if zero beam or a weak crt. BP From: (Brad Petria) BP Hi, BP I have a Magnavox TV chassis 27B502-00AA in my shop. I replaced BP the H.O.T. Q503 # 610597 (on device) which was shorted and the BP horiz. driver Q500 BSN274 # 483513047931 which was bad. I checked BP the regulated B+ which is 131.8V (130V is ideal). The HV measures BP 30KV when it should be 27KV - 28KV. Note: It can't be due to 1.8V BP high B+ since math shows an increase of about 400V (HV). I checked the BP FBT core and it isn't loose. Did you have this experience and what was BP the cause? BP Thanks in advance, Brad BP Tip for your old computer (reduce discard pollution too): BP If you can't sell your old computer, don't throw it away. Use it BP to backup your software by transferring files/folders from your new BP computer or laptop to it. I transferred my Windows folder and other BP stuff to my old computer using "PC Link", which I downloaded from BP www.simtel.net (cool site). BP http://www.simtel.net/pub/dl/52792.html (info or download) |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
recent problem with Woodwork-L | Woodworking | |||
jointer problem | Woodworking | |||
Sears air compressor starting problem | Woodworking |