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Different digital boxes and tv's have different levels of RF gain. Some need more signal and some need less to work efficiently.
Possibly your Bush pvr needs a much stronger signal than your tv so the available signal is permanently on the threshold of reception and atmospheric conditions will some of the time reduce the available signal when reception will become impossible for the box but still be above the threshold for the tv set.
Modern Bush is not reknown for being a high quality brand and the purchasers of budget brand pvr's often discover reception or performance problems in fringe signal areas. Because a single aerial must receive a very wide range of frequencies it will be more efficient for some channels than others and so one channel could be a fringe channel and another channel produce a very strong frequency.
The signal strength and quality can be checked for each channel by selecting options in the menu in order to check this theory.
The problem might be solved by replacing the Bush pvr with a premium brand or replacing your aerial for a more efficient type. One of my friends had five different boxes before he gained a satisfactory performance and another friend three boxes and still has problems.
My installation has a new high gain wideband aerial on top of my 3 storey house and a distribution amplifier in the loft to keep the input lead short and the whole lot connected by very good quality double-wrapped co-ax.
I had to add different amounts of attenuation for each box or tv set but in spite of the signal being on average too strong and needing attenuating there are still channels for which the aerial is not as efficient and providing only a weak signal.
You might be on the wrong "channel" on your TV. On the remote for your TV, there should be a set of buttons for if you want the remote to control the TV, or DVD player, or Aux 1 or 2. You want to click the TV button and try changing the TV's "channel". Your cable/DVD player are on different "channels" of the TV. Try scrolling up and down through the "channels" of your TV.
This is a problem with the vertical circuit. Look for a small flat IC attached to a heatsink that will be marked LA7837 or something similar. It should have about 11 pins. Try resoldering the pins on that IC first. If that does not resolve the problem, replace the IC. There may be capacitors that require replacement in that circuit as well.
A repair like this is in the vertical drive/output section of the TV set. It could be a simple capacitor causeing this problem or a combination of the capacitor and the output IC. A repair like this should not exceed 120 to 150 US. Is it worth that to you? How much can you replace it for? Good Luck
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