[TechAssist] Re: Electrohome 69ck02-clicking on/off
- From: "Gonzalo Arrivas" <gna2000@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 04 Jan 2002 15:54:15 +0000
Ian,
The relay drive transistor should be drawing current, low collector voltage,
to energize the relay when you push the on/off button. The collector voltage
should rise to B+ when you remove the bias, such as shorting the emitter to
base. At any time the emiiter-base junction of any transistor is able to
control the collector current flow, the transistor is good. If the relay
circuit is good, try replacing the HOT, may check good but run into it many
times and cause the shut down intermittently. Check the board for bad solder
connections, specially around the HV sweep circuit.
G.N.Arrivas. CET CA
>From: "Ian Scott" <service.depot@xxxxxxxxxxx>
>Reply-To: techassist@xxxxxxxxxxxxx
>To: "Techassist" <techassist@xxxxxxxxxxxxx>
>Subject: [TechAssist] Electrohome 69ck02-clicking on/off
>Date: Fri, 4 Jan 2002 10:08:44 -0500
>
>
>Hello folks, I have a TV that clicks on/off when I hit the power button.
>If I short the power relay contacts it runs ok. There are two
>transistors that drive the power relay coil. I replaced them, the unit
>started to work and worked for several days (until my customer took it
>home, then it quit working).
>I have replaced the power relay, a capacitor (220ufd/10v) right next to
>power relay, and checked resistors in and around the circuit. I thought
>I had repaired it after I replaced the capacitor, because it started
>working again, and continued to work for several hours. The next
>morning it was back to the same on/off fault.
>The base of the first transistor stays at .6 volts after the power
>button is pressed, but the second transistor's base is changing, which
>powers the relay on/off. I do not have a schematic.
>I appreciate any help.
>
>Thanks in advance,
>Ian Scott
>Service Depot
>
>
>
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G.N.Arrivas, CET, Pittsburg. CA
Tel/Fax: 925-432-2057
Email: gna2000@xxxxxxx
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