hitachi resistor


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hitachi resistor

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nobleman
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Sep 8, 2009, 7:02 PM

Post #1 of 32 (3549 views)
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hitachi resistor	Can't Post

Hi, I have a Hitachi 57F500A that needs a new resistor. Does anyone know the value of resistor R941? Thanks for your help.

jts1957
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Sep 9, 2009, 7:09 AM

Post #2 of 32 (3539 views)
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Re: [nobleman] hitachi resistor [In reply to]	Can't Post

For a 51F500a:
R941 0119695M RES.-MTL OXIDE FLM 1W 0.47-F 0

Probably the same. Choice is yours.

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nobleman
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Sep 9, 2009, 5:46 PM

Post #3 of 32 (3532 views)
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Re: [jts1957] hitachi resistor [In reply to]	Can't Post

Thanks for the reply, however i dont quite understand what it means. any way you could simplify the terms. as in ohms and tolerance. Thanks.

jts1957
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Sep 10, 2009, 2:19 AM

Post #4 of 32 (3527 views)
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Re: [nobleman] hitachi resistor [In reply to]	Can't Post

R941 0119695M RES.-MTL OXIDE FLM 1W 0.47-F 0

Location Number: R941
Hitachi Part Number: 0119695M
Description: Resistor
Composition: Metal Oxide Film
Wattage: 1Watt
Value: 0.47 Ohms
Not sure: -F 0 probably tolerance / 10% or less

The bad news: you just proved you don't do this for a living.

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rrobor
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Sep 10, 2009, 8:14 AM

Post #5 of 32 (3521 views)
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Re: [jts1957] hitachi resistor [In reply to]	Can't Post

Its a safety resistor, so if its a safety resistor, its a fuse and if it gave up the ghost it was due to a short something else. My advice is dont change that till you know why it failed. Its as common as hens teeth for a safety resistor to blow for no reason.

jts1957
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Sep 10, 2009, 9:41 AM

Post #6 of 32 (3520 views)
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Re: [rrobor] hitachi resistor [In reply to]	Can't Post

Why are you telling ME this? Shocked

The New User just asked for a "value."
I figured when he installed the replacement, the smoke coming from the new one or elsewhere in the set might cause him to give a thought to checking the surrounding components....

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rrobor
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Sep 10, 2009, 11:26 AM

Post #7 of 32 (3515 views)
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Re: [jts1957] hitachi resistor [In reply to]	Can't Post

Hey man Im not telling you this, why would I. We are both a bit long in the tooth to change a safety resistor and think our issue is over. Just thought Id save the guy from the belief that all is well, only to see his new resistor glow red for a second. You and I both know a 1W burnt out has a cause, that poor sod doesnt.

nobleman
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Sep 15, 2009, 5:03 PM

Post #8 of 32 (3491 views)
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Re: [rrobor] hitachi resistor [In reply to]	Can't Post

Actually, i haven't replaced anything yet. I pulled the back off and after inspecting the board i saw that r941 was burned. i did test the pic fuse near it and it too was bad. your right, i dont do this for a living. its more of a hobby that i do make some money from. But thanks for the help. i greatly appreciate it.

nobleman
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Sep 15, 2009, 9:13 PM

Post #9 of 32 (3481 views)
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Re: [jts1957] hitachi resistor [In reply to]	Can't Post

jts, you were right. the new resistor smoked. any idea of what could be causing this to short out. i did check some other resistors and fuses around it and they checked out to be ok. thanks again.

rrobor
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Sep 16, 2009, 10:56 AM

Post #10 of 32 (3470 views)
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Re: [nobleman] hitachi resistor [In reply to]	Can't Post

When you fix you have to find these things out. R941 well that sounds like its in the power supply, Is it off a transformer? the other end, does it feed a diode? Does the diode test short. Resistors dont go short Diodes and Ics do and the odd capacitor. What does the set do without that resistor, Does it feed the vertical , can you run along the print from the diode and see where it goes. That is how you fix, not saying resistors around it look OK. If I am correct and its an LT line from the supply, chances are it feeds the sound with 24 odd volts and the sound IC is faulty. But thats a guess

jts1957
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Sep 16, 2009, 3:02 PM

Post #11 of 32 (3467 views)
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Re: [nobleman] hitachi resistor [In reply to]	Can't Post

IF schematic I'm looking at IS close enough (51F500a) ... Something connected to the SW+115 (PPD6 pin 9 & 10) volt line? Connect a DVM on ohms between there and ground - should be a climbing reading.
One side of R941 should connect to D916 cathode and Q905 emitter; the other side should connect to two E906 (500), E907(3000) "protectors."
My guess: the horizontal output transistor.

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nobleman
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Sep 16, 2009, 7:00 PM

Post #12 of 32 (3462 views)
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Re: [jts1957] hitachi resistor [In reply to]	Can't Post

Hey guys thanks again for your help. no more smoke. but now it turns on for about 5 seconds and then shuts off. is it still the same issue or something else?

jts1957
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Sep 17, 2009, 4:53 PM

Post #13 of 32 (3451 views)
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Re: [nobleman] hitachi resistor [In reply to]	Can't Post

How did the above parts check? Tongue

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nobleman
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Sep 17, 2009, 5:11 PM

Post #14 of 32 (3448 views)
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Re: [jts1957] hitachi resistor [In reply to]	Can't Post

They all tested good. Now the set automatically turns on when i plug it in and i know that it should'nt. stays on for about 5 seconds and then shuts off. am i just wasting our time or is it worth the repairs. the tv is in flawless condition. except for the repair.

jts1957
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Sep 17, 2009, 5:16 PM

Post #15 of 32 (3446 views)
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Re: [nobleman] hitachi resistor [In reply to]	Can't Post

Voltage there? SW+115 (PPD6 pin 9 & 10) volt line?

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nobleman
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Sep 17, 2009, 5:24 PM

Post #16 of 32 (3443 views)
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Re: [jts1957] hitachi resistor [In reply to]	Can't Post

how do i test that? also, the mini resistor R942 is burned. whats the value of that one? Thanks.

jts1957
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Sep 17, 2009, 5:32 PM

Post #17 of 32 (3441 views)
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Re: [nobleman] hitachi resistor [In reply to]	Can't Post

Quote

Voltage there? SW+115 (PPD6 pin 9 & 10) volt line?

With a Digital Volt Meter (DVM). With it set to measure DC Volts put the black (Negative) test lead on "Ground" and the red (Positive) lead on Pin #9 or 10 of connector PPD6).

EDIT:

Quote

i did test the pic fuse near it and it too was bad.

What one is this?

R942 0700054M RES.-CARBON FLM 1/16W 10K-JB
10K ohm 1/16 watt carbon film

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(This post was edited by jts1957 on Sep 18, 2009, 11:11 AM)

nobleman
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Sep 18, 2009, 8:44 PM

Post #18 of 32 (3424 views)
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Re: [jts1957] hitachi resistor [In reply to]	Can't Post

jts, thanks again on R942. I'm having a hard time getting a DVM. i have an analog multimeter. will this suffice for checking PPD6? also where do i ground it to.

jts1957
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Sep 18, 2009, 10:59 PM

Post #19 of 32 (3421 views)
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Re: [nobleman] hitachi resistor [In reply to]	Can't Post

IF YOU Know HOW to use it and it's still in good working order. Smile

Any Cold, yes cold ground will do. Pin 3 or 4 of same connector, Tuner case/cover, etc.

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nobleman
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Sep 19, 2009, 7:06 PM

Post #20 of 32 (3410 views)
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Re: [jts1957] hitachi resistor [In reply to]	Can't Post

ok, so i put the meter on and the needle didnt move. now what? thanks.

jts1957
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Sep 19, 2009, 8:29 PM

Post #21 of 32 (3408 views)
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Re: [nobleman] hitachi resistor [In reply to]	Can't Post

Be sure meter on DC Volts. Measure the cathode of D916 to ground. Should be approx. 115 Volts. Smile

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nobleman
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Sep 21, 2009, 7:38 PM

Post #22 of 32 (3390 views)
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Re: [jts1957] hitachi resistor [In reply to]	Can't Post

ok, i checked D916. the needle did not move. it does move backward a little though. Does the board lights mean anything. they are pulsating when its on and the two at the very back dont turn on. thanks again jts.

jts1957
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Sep 21, 2009, 8:29 PM

Post #23 of 32 (3385 views)
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Re: [nobleman] hitachi resistor [In reply to]	Can't Post

Quote

i did test the pic fuse near it and it too was bad.

FOR THE 2ND TIME .... Which one was that? Angelic

Did you "Check D916" OR "check the voltage from the cathode end of D916 to ground?"

Which board?, What Lights? Cool

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nobleman
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Oct 7, 2009, 10:36 PM

Post #24 of 32 (3354 views)
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Re: [jts1957] hitachi resistor [In reply to]	Can't Post

hey jts, sorry i havent had a chance to reply. started a new job. anyway aside from the hitachi, i also have an older mitsubishi vs-5061 giving me problems. when i go into the menu everything is fine, when i exit the menu the crt's turn off. what gives? thanks.

jts1957
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Oct 7, 2009, 10:57 PM

Post #25 of 32 (3353 views)
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Re: [nobleman] hitachi resistor [In reply to]	Can't Post

Any &/or every input?

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