[Kenwood] TM-V7A Power On Problem

[John]

I had some time this evening and I opened up the V7A,?? There is 
definitely a leak from C523. I can see the electrolyte has leaked and is 
visible on the board.

Next I will source the cap and attempt replacement,

Thanks again Clif for pointing me in the correct direction for this repair.


John

N7JL



On 9/22/19 7:39 PM, Clif Holland wrote:
> When the reset line voltage varies from 0 to 5 there is no telling 
> what it will do. There are 2 internal surface mount fuses.
>
> Clif Holland KA5IPF
>
> On 9/22/2019 9:12 PM, John via Kenwood wrote:
>> Thanks for the tip. !?? I will investigate further in a few weeks,
>>
>> Do you think this also applies to Rick's intermittent power issue as 
>> well?
>>
>> John
>>
>> N7JL
>>
>>
>> On 9/22/19 3:54 PM, Clif Holland wrote:
>>> Clif's Notes:
>>>
>>> Check internal fuses
>>> Pin 60 of uPc should be 5 v if low then;
>>> In Control unit C523 leaked and damaged Reset line under it.
>>>
>>> Clif Holland KA5IPF
>>>
>>> On 9/22/2019 5:20 PM, John via Kenwood wrote:
>>>> Mine just recently decided to not turn on at all .?? I checked what 
>>>> fuses I could find, so I will be "listening in" to see what 
>>>> suggestions are offered up here.
>>>>
>>>>
>>>> John
>>>>
>>>> N7JL
>>>>
>>>>
>>>> On 9/22/19 8:48 AM, Rick Markey, KN3C wrote:
>>>>> Over the years, I have amassed three "blue eyed monsters" aka the 
>>>>> Kenwood TM-V7A.?? Two have lines in the display, but one is still 
>>>>> perfect! I was housecleaning and decided to power them up and 
>>>>> reprogram them using the RT Systems software.
>>>>>
>>>>> One of the three radios will only power on intermittently.?? When 
>>>>> you can get it to power on, you can then power it off, on, off, 
>>>>> on, seemingly forever.?? If you leave it turned on, it will 
>>>>> eventually turn itself off.?? It's not the control head, I've 
>>>>> swapped them around.?? I've done factory resets on it and that has 
>>>>> no effect, although the reset does work if you catch the radio in 
>>>>> the right mood.
>>>>>
>>>>> I have not opened up the radio for a look around.?? Just curious 
>>>>> if anyone else has seen this and has a suggestion?
>>>>>
>>>>> Thanks,
>>>>> Rick, KN3C
>>>>>
>>>>>
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