Question about Sony Handycam DCR-TRV8 Mini DV Digital Camcorder

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Replacing Internal Battery

My date and time won't save anymore. How do you find and change the internal battery?

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Replacing Internal Battery - 0536ac96-96ab-4207-81d1-8c680dcfcbb5.jpgd8946833-3beb-4b20-af86-e7aacfb6f1f6.jpgWORD OF CAUTION;
There are many delicate parts and ribbon cables to be disconnected. This is not
a job to be attempted by anyone inexperienced in working with delicate and
static sensitive electronics. I take no responsibility for damage you may cause
in attempting this repair. If in any doubt whatsoever, TAKE THE CAMERA TO A

I recently purchased a Sony PD100 camera from Ebay.
Generally it was in very good condition but it became apparent that the Camera
settings were lost whenever the main battery was removed. The most likely culprit was assumed to be the
coin backup battery.

With no obvious easy access to the coin battery I downloaded
the manual which was of little help other than "Take it to a Sony repair
facility". I am an experienced electronics engineer of 40 years. Nevertheless, it
was with some apprehension, I decided to bite the bullet and dive in. My
findings are as follows;

The data memory coin battery is located inside the camera on
the hidden side of PCB CK-80. This PCB is located on the inside of the casing
on the LCD panel side of the camera. The battery is a Panasonic VL2020 (BT7200)
rechargeable which is soldered to the PCB. There are several variations to the
VL2020, vertical mount, horizontal mount, rechargeable and non rechargeable,
none I could find had a reference BT7200. The best match seemed to me to be Panasonic
VL2020 HFE Lithium Vanadium rechargeable.

To access the CK-80 PCB, the rear main battery mount plate
and the top cover with the view finder have to be removed before the LCD side
of the camera can be removed. Take care not to put strain on the ribbon cables
and harnesses as you dismantle each assembly. (Reassembly of these cables is
also very tricky).

NOTE; There are many screws to remove, some are similar but
there are some that differ. I find it useful to keep the screws for each panel
or subassembly in different containers so as to avoid loss and to aid
reassembly. Make notes and use digital pictures as an aid to ensuring all
screws are installed and cable locations are not overlooked when reassembly.
There's nothing worse than finding screws left over after assembly with no clue
where they came from!

A twist in the tail.... Once I had access to the coin battery
I checked it with a DVM and found it was ok? On further inspection, I found
evidence of a little water ingress via the reset button and the switch and
surrounding area on the PCB was covered in corrosion. The DVM showed this
corrosion was leaking current across the contacts, effectively shorting the
reset button causing a permanent reset. I was able to clean the PCB and as I
had the new battery anyway, it would have been silly not to replace it while
the camera was dismantled. After the camera was reassembled (no screws left
over), The camera was fully tested and it now functions 100% correctly.

Once again, I would strongly suggest that anyone thinking of
taking this job on be certain of your ability. I take no responsibility for any
damage you might do to your camera.

Posted on Oct 08, 2013

  • K Harvey Oct 09, 2013

    One thing I forgot to mention. When you replace the coin battery, take the plastic insulator disc (just peels off) from the old battery and put it on the new battery to keep it away from the the pcb tracks.


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I would guess it be on the bottom where the tripod connect to the unit or in the back where the battery connects to the unit.

Posted on Feb 11, 2008

  • a126 Dec 23, 2010

    This camcorder doesn't have a clock battery, it uses the main li-on cell battery on the back


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My internal backup battery is dead, can anyone tell me where to find the specs to replace the internal battery? and what type of internal battery is it? Thanks

If it's been a few months since you have used the camera it's normal to be dead.
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The camera will work fine even if the battery does not work, however, you will not be able to record time and date.


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