Hi. Got a Magnavox L01-1UAC-7638. Came in, shorted HOT. Ordered Mat Elec kit (HOT, 2 elec caps and 2 driver transistors), put in, lasted 2 weeks. Put another kit in 3 days ago (thinking maybe a bum part) and HOT died in minutes. Nothing seemed overly hot, just dropped in chirp from power supply. No oddball solder joints or anything else obvious. Runs perfectly with great picture and sound, then dies with no warning.
Flyback perhaps?
Cheers, Danny
We've seen counterfeit transistors in some of these kits. Often the original part is the only way to go. Assuming there's no bad solder connections at the horizontal drive transformer, you're probably looking at timing caps, (usually blue in color, I'm told) or B+ too high.
I doubt it's the flyback.
Mark Z.
Sounds like a problem in the H drive circuit. There is a mod kit for the L04 chassis that replaces the H drive coil, a surface mount transistor in the drive circuit and a resistor. There is some confusion as to whether the same applies to the L01 that a Philips ASC may be able to clear up. The parts in the two circuits are different, but the problem may be similar. I have had several of the L01 sets that had bad H drive transistors and a bad related cap. The area around the parts was darkened from heat so it is easy to find.
Leonard
What size set is this. On some of the 32inch sets with this chassis is known to have some bad crts. Would this be cause of your blown hot ? Also did the kit come with 7461, 2455, 7463, and 7462
It is a 32 inch set. I don't have the location numbers at hand, set is at ladies home and my notes are at the shop, but it came with HOT, 2 small transistores for H drive, 1 pnp and 1 npn, and 2 caps. I believe they were a
220 and a 47 uf, but don't hold me to that right now.Danny
The known bad crts are A80QCF340X34(N). See what happens when you remove the anode and the crt board from the crt. See if the hot blows or not.
Alot of forums suggest replacing the transformer 7460, along with
47uF35v cap. to fix this problem. There is a "repair" kit p/n 483531057577 from Andrew's Electr> The known bad crts are A80QCF340X34(N). See what happens when youI haven`t seen anything about the transformer on this problem but could be. Are those fuse and diode thats listed still good in this set ? Also do you have the schematic for it. If you need it let me know with an email addy that I can send it to.
The kit from Philips for the L04 chassis contains the transformer, drive transistor, and a resistor. That chassis will eat the output and I suggest installing the Philips kit. Every one of the L01 sets that I have seen has had a bad cap and drive transistor, but none has caused a failure of the output transistor.
Do any of you Philips ASCs know if there is a kit from Philips for the L01?
Also, please post at least something from the previous post, if not more of the thread, so that we can know to whom you are responding and add some context to your post.
Leonard
MAT Electronics in their 2006 winter catalog lists the LO1.1U repair Kit #: 62-280, for US$ 4.95 or 10 for US$ 4.50 each. Includes 1 each: BU4058DX, BC547, BC557, 47M/50V, 220/35V It is a good deal! For more info:
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