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It probably has no connection with the hot weather[unless possibly you were doing some solar observing during the heat of the day.]
The first thing to check is the crimping of the H.C. to mount cable; this was
a frequently encountered problem with HEQ5s & NEQ6s. You need access to a pair of suitable crimping pliers, or try another cable that is known to be good.
The second likely possibility is the pair of large condensers at the bottom front of the card which is exposed when the front cover is removed. If one or both is fried, it/they will be bulging instead of parallel sided. If it/they are shot, new ones can be obtained from JCAR for about 75c each. You will need a high temperature soldering iron to replace them. If only one is shot replace both.
raymo
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