Bentley 100C B&W portable TV.
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From: b on 16 Jun 2010 18:14 On 16 jun, 23:41, Jeffrey D Angus <jan...(a)suddenlink.net> wrote: > But I had a customer drag in a Bentley 100C the other day. > "This looks familiar." So a bit of rooting around in a closet > and I found it's brother. Customer TV makes noise, and a > barely visible white horizontal line. frame collapse. trace the wires back from the yoke to the pcb, look for an i.c with at least 6 or 8 pins, probably heatsinked, or a pair of transistors. start there. check there is a supply voltage, usually between 20 and 60v, probably from a secondary of the big black line output transformer. could be an open resistor in this feed. >Mine is totally dead. well, have you checked for missing voltages inside? bad solder joints? protection diode near 12v inlet? -B
From: Jeffrey D Angus on 16 Jun 2010 18:55
b wrote: > On 16 jun, 23:41, Jeffrey D Angus <jan...(a)suddenlink.net> wrote: >> But I had a customer drag in a Bentley 100C the other day. >> "This looks familiar." So a bit of rooting around in a closet >> and I found it's brother. Customer TV makes noise, and a >> barely visible white horizontal line. > > frame collapse. trace the wires back from the yoke to the pcb, look > for an i.c with at least 6 or 8 pins, probably heatsinked, or a pair > of transistors. start there. check there is a supply voltage, usually > between 20 and 60v, probably from a secondary of the big black line > output transformer. could be an open resistor in this feed. > > >> Mine is totally dead. > > well, have you checked for missing voltages inside? bad solder joints? > protection diode near 12v inlet? > -B thankies, I'll post the resutls in a day or so. -- �Egotism is the anesthetic that dulls the pain of stupidity.� Frank Leahy, Head coach, Notre Dame 1941-1954 http://www.stay-connect.com |