Mulja tv repair portal
Equipment Repairs => LCD TV forum => Topic started by: Turnip on January 20, 2019,10:08:57
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Had this Argos wonder in last year, where after doing a channel scan it seemed OK.
Came in again today with the same issue, but after a re-scan it missed out some channels and picture looked every bit like weak signal though other sets in the WS were OK.
Wonder if there's issues with this model ? Chris.
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Have you checked the supplies are 'hash free', sounds like memory being corrupted, when you say weak signal what does the signal strength indicate or is it actual picture? Trying a video input to by-pass the tuner might throw some light.
Dave
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Thanks Davy,
Admit haven't yet taken the back off to discover who made it, as it's Bush and likely crap from Eastern Europe. Mind you it uses the Philips RC5 RCU code, so might be a Vestel - Hopefully.
Guess take the back off tomorrow and see the worst - Chris.
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Hi Davy,
Had a look and it's a Vestel with no identifying info - Attach a SSB picture.
Seems OK, but only with a very strong signal, otherwise misses most channels. Guess tuner dubious as aerial socket seems OK.
As a Bush, nothing on line or Ebay apart from RCU and stand screws - Chris.
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Might be under the heat sink, trust you looked on underside. Think it's a 23299522 (17MB100)
Not some stupid AGC setting in factory set up menu is it?
Dave
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Thanks Dave,
Didn't pull off the heat sink as might have dislodged any BGAs, as seemed firmly stuck. Noticed three sprung loaded whatsits to maybe keep the heat sink in place.
Cautious, maybe a setting as you suggest, but 'Bush' on line suggests nothing apart from recycling.
Maybe an idea to go 'Vestel' see if they admit having a 'Bush' badge.
Thanks for possible 23299522 17MB100 - will check out - Chris.
In the event, set works fine with a huge signal, so as no SSB's on Ebay will suggest an aerial amp or maybe a freeview box with HDMI output as it doesn't have a Scart. Gather although set is supposed to be 'Smart' the customer isn't.
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Could be the rf amp in tuner kaput.
Because of so many versions of the main board as you probably know I'd be tempted to use the 23299522 number.
Dave
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Hi Dave and thanks,
Lots of 17MB100 on Ebay, but not that number at present. Bit odd why prices vary so much. Thought buy the cheapest cheapy as the tuners look the same and possibly are. Getting out the 'solder mop' - Through hole stuff is such a pain.
As an aside, chap brought in an LG needing a SSB cook as his HDMI had vanished. Cooked it so well I melted both Scart sockets and he couldn't get the plugs in. Bit of a pain changing them from an old Vestel board. Now only cook at 190 C for ten minutes - All fun - Chris.
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Main board prices vary dramatically.... never had a bad one yet from Ebay gotta admit. Solder wick now that stuff is what I call dear for what it is, all too easy to 'cut n' use' and then it's all gone.
Dave
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Hi Davy,
Yes but - Wonder what you use to sort solder print through on multi pin stuff ? Admit a some times I snip the pins, but still need clear the holes.
While ago bought a thing with a heated nozzle and vacuum pump. Sadly it blocked up in seconds so had to get a very long 3mm drill to clear it out. Admit haven't used it since - Chris.
Later, got my cheapy 17MB100 board, but discovered the tuner is integral to the panel, just a tin can with the aerial socket, an Xtal and a small SMD chip - Guess can't win 'em all.