Status: FIXED

Repair cost: About $18

KLOV Post: http://forums.arcade-museum.com/showthread.php?p=1355615

Symptom:  Post-cap kit, monitor in HV shutdown, shakes, vertical collapse

Diagnosis: Voltage regulator bad?  Also could be B+ pot.

Fix:

• 7/23/2010 – After a cap kit, monitor went into HV shutdown shortly after being powered on.  B+ at 137v.
• 9/24/2010 – Replaced Q901, IC601, VR601 (B+ pot).  Monitor now has the shakes (video). B+ sitting at 110-111v.
• 2/6/2012 – Replaced TR402/TR403, monitor now has vertical collapse.
• 2/12/2012 – VR354 is stuck at 18kOhm, and adjusting it does nothing, thinking pots might be bad?  Removed it, and once out, it tested good.
• 3/3/2012 – Tested R473 (1 ohm, by the flyback) and it was bad. Replaced it with a 1/2 watt. R477 tested fine, but flaky, and looked pretty bad/burnt…easy decision to replace it.  3.3ohm metal film fusible, 1 watt.

I later learned that sometimes the following resistors should be changed out during a cap kit on the Sanyo 20EZV. The majority of cap kits out on the market do not include them. They are included in the Zanen kit and the Twisted Quarter kit. Failure of any one of these 3 resistors can cause vertical collapse after completing a cap kit on a Sanyo 20EZV.

R472 – 33 ohm 1/4w
R473 – 1 ohm 1/4w
R478 – 1 ohm 1/4w

Big thanks to Dave Okert and his Sanyo 20EZV Flow Chart, which is a great starting point for any Sanyo repairs!

Links:
Sanyo 20EZV Flow Chart
Sanyo 20EZ Troubleshooting Guide