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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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Help with Toshiba CF3072B
I am looking for help with a Toshiba 30" TV, model CF3072B. The problem is
with the top 10% of the picture. It has white lines across the first 40 -50 lines. I believe that one or more of the capacitors in the vertical or horizontal circuit is bad. I'm hoping someone out there has an idea on which one it maybe. Stephen |
#2
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Help with Toshiba CF3072B
Lots of them, replace all the vertical circuit related capacitors.
Do a Google groups search for Toshiba, vertical for the specifics. "Stephen K. Long" wrote in message ink.net... I am looking for help with a Toshiba 30" TV, model CF3072B. The problem is with the top 10% of the picture. It has white lines across the first 40 -50 lines. I believe that one or more of the capacitors in the vertical or horizontal circuit is bad. I'm hoping someone out there has an idea on which one it maybe. Stephen |
#3
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Help with Toshiba CF3072B
Especially the small caps near the vertical output and the similar one near
the jungle chip. I seem to remember they were either red or green in colour but can't recall the value. "David" wrote in message ... Lots of them, replace all the vertical circuit related capacitors. Do a Google groups search for Toshiba, vertical for the specifics. "Stephen K. Long" wrote in message ink.net... I am looking for help with a Toshiba 30" TV, model CF3072B. The problem is with the top 10% of the picture. It has white lines across the first 40 -50 lines. I believe that one or more of the capacitors in the vertical or horizontal circuit is bad. I'm hoping someone out there has an idea on which one it maybe. Stephen |
#4
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Help with Toshiba CF3072B
"David" wrote in message ... Lots of them, replace all the vertical circuit related capacitors. Do a Google groups search for Toshiba, vertical for the specifics. Actually there are not likely to be that many, maybe a half dozen caps. IIRC this one also has the potentiometer that needs to be cleaned thoroughly and a cap or two in the p.s. that get bad. Note that on most of the Toshibas, one of the caps in the vertical circuit (typically 3xx numbering) is in the vicinity of the VCJ chip and sometimes gets missed if you don't know the sets. Rather than replacing all of the vertical circuit caps, you need to test them properly, along with caps in other areas, and replace the bad caps in the entire set if you want a reliable fix. This set may have also had the infamous Sony sound module or the problems with bad solder joints at the interface of the daughter-boards to the main board. Be sure to clean any electrolyte leakage off of the board and repair any corroded traces. Leonard |
#5
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Help with Toshiba CF3072B
Quick question, what is the VCJ chip and were is it located?
Stephen "Leonard Caillouet" wrote in message news:cG7Nc.11411$BX.472@lakeread08... "David" wrote in message ... Lots of them, replace all the vertical circuit related capacitors. Do a Google groups search for Toshiba, vertical for the specifics. Actually there are not likely to be that many, maybe a half dozen caps. IIRC this one also has the potentiometer that needs to be cleaned thoroughly and a cap or two in the p.s. that get bad. Note that on most of the Toshibas, one of the caps in the vertical circuit (typically 3xx numbering) is in the vicinity of the VCJ chip and sometimes gets missed if you don't know the sets. Rather than replacing all of the vertical circuit caps, you need to test them properly, along with caps in other areas, and replace the bad caps in the entire set if you want a reliable fix. This set may have also had the infamous Sony sound module or the problems with bad solder joints at the interface of the daughter-boards to the main board. Be sure to clean any electrolyte leakage off of the board and repair any corroded traces. Leonard |
#6
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Help with Toshiba CF3072B
Thanks all,
I replaced C308, 35V 220uF. The free TV looks great and my wife thinks I HOT..... "David" wrote in message ... Lots of them, replace all the vertical circuit related capacitors. Do a Google groups search for Toshiba, vertical for the specifics. "Stephen K. Long" wrote in message ink.net... I am looking for help with a Toshiba 30" TV, model CF3072B. The problem is with the top 10% of the picture. It has white lines across the first 40 -50 lines. I believe that one or more of the capacitors in the vertical or horizontal circuit is bad. I'm hoping someone out there has an idea on which one it maybe. Stephen |
#7
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Help with Toshiba CF3072B
Congrats Steve!!
"Stephen K. Long" wrote in message link.net... Thanks all, I replaced C308, 35V 220uF. The free TV looks great and my wife thinks I HOT..... "David" wrote in message ... Lots of them, replace all the vertical circuit related capacitors. Do a Google groups search for Toshiba, vertical for the specifics. "Stephen K. Long" wrote in message ink.net... I am looking for help with a Toshiba 30" TV, model CF3072B. The problem is with the top 10% of the picture. It has white lines across the first 40 -50 lines. I believe that one or more of the capacitors in the vertical or horizontal circuit is bad. I'm hoping someone out there has an idea on which one it maybe. Stephen |
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