HITACHI 53SDX01B, 53FDX01B, 53FDX01BA, 61SDX01B, 61SWX01W Service Manual

August, 2001

Hitachi America, Ltd., Home Electronics Division
National Service

MODEL CHASSIS
43FDX01B DP05F
53FDX01B, 53FDX01BA DP05
53SDX01B, 61SDX01B DP06
53SWX01W, 61SWX01W DP07

SUBJECT: INTERMITTENT BLACK HORIZONTAL BARS

Details:

We have received isolated field reports with a symptom of highly intermittent black
horizontal bars appearing in the picture. If the unit is removed from the customers
location, the symptom more than likely will not show up. The cause of this
phenomenon results from low AC. These models are designed to operate normally
when using 120VAC ±10% (108VAC - 132VAC). The symptom will occur when
AC drops below 90VAC.

Countermeasure:
(NOTE - Only perform this countermeasure for specific customer complaint)

Procedure:

1. Change value of capacitor C009 from 10uF/16V to 22uf/16V. Use locally
procured part for new capacitor (22uf/16V). C009 is located on the SIGNAL
PWB near the IC01 heat sink and the PR connector.

2. Verify the effectiveness of this countermeasure by dropping AC to less than
90VAC using a variable AC isolation transformer. Symptom may still manifest
at lower than 80VAC.

PTV

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